4.Spring Boot web开发

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1.创建一个web模块

(1).创建SpringBoot应用，选中我们需要的模块；

(2).SpringBoot已经默认将这些场景配置好了，只需要在配置文件中指定少量配置就可以运行起来

(3).自己编写业务代码；

自动配置原理

@H_301_30@xxxxAutoConfiguration：帮我们给容器中自动配置组件；

@H_301_30@xxxxProperties:配置类来封装配置文件的内容；

2.SpringBoott对静态资源的映射规则

@H_301_30@@ConfigurationProperties(prefix = "spring.resources",ignoreUnknownFields = false)

@H_301_30@public class ResourceProperties implements ResourceLoaderAware {

@H_301_30@  //可以设置和静态资源有关的参数，缓存时间等

 

@H_301_30@WebMvcAuotConfiguration：

@H_301_30@@Override

@H_301_30@public void addResourceHandlers(ResourceHandlerRegistry registry) {

@H_301_30@if (!this.resourceProperties.isAddMappings()) {

@H_301_30@logger.debug("Default resource handling disabled");

@H_301_30@return;

@H_301_30@}

@H_301_30@Integer cachePeriod = this.resourceProperties.getCachePeriod();

@H_301_30@if (!registry.hasMappingForPattern("/webjars/**")) {

@H_301_30@customizeResourceHandlerRegistration(

@H_301_30@registry.addResourceHandler("/webjars/**")

@H_301_30@.addResourceLocations(

@H_301_30@"classpath:/Meta-INF/resources/webjars/")

@H_301_30@.setCachePeriod(cachePeriod));

@H_301_30@}

@H_301_30@String staticPathPattern = this.mvcProperties.getStaticPathPattern();

@H_301_30@           //静态资源文件夹映射

@H_301_30@if (!registry.hasMappingForPattern(staticPathPattern)) {

@H_301_30@customizeResourceHandlerRegistration(

@H_301_30@registry.addResourceHandler(staticPathPattern)

@H_301_30@.addResourceLocations(

@H_301_30@this.resourceProperties.getStaticLocations())

@H_301_30@.setCachePeriod(cachePeriod));

@H_301_30@}

@H_301_30@}

@H_301_30@ 

@H_301_30@        //配置index映射

@H_301_30@@Bean

@H_301_30@public WelcomePageHandlerMapping welcomePageHandlerMapping(

@H_301_30@ResourceProperties resourceProperties) {

@H_301_30@return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(),

@H_301_30@this.mvcProperties.getStaticPathPattern());

@H_301_30@}

@H_301_30@ 

@H_301_30@       //配置图标

@H_301_30@@Configuration

@H_301_30@@ConditionalOnProperty(value = "spring.mvc.favicon.enabled",matchIfMissing = true)

@H_301_30@public static class FaviconConfiguration {

@H_301_30@ 

@H_301_30@private final ResourceProperties resourceProperties;

@H_301_30@ 

@H_301_30@public FaviconConfiguration(ResourceProperties resourceProperties) {

@H_301_30@this.resourceProperties = resourceProperties;

@H_301_30@}

@H_301_30@ 

@H_301_30@@Bean

@H_301_30@public SimpleUrlHandlerMapping faviconHandlerMapping() {

@H_301_30@SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();

@H_301_30@mapping.setOrder(Ordered.HIGHEST_PRECEDENCE + 1);

@H_301_30@               //所有  **/favicon.ico

@H_301_30@mapping.setUrlMap(Collections.singletonMap("**/favicon.ico",

@H_301_30@faviconRequestHandler()));

@H_301_30@return mapping;

@H_301_30@}

@H_301_30@ 

@H_301_30@@Bean

@H_301_30@public ResourceHttpRequestHandler faviconRequestHandler() {

@H_301_30@ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();

@H_301_30@requestHandler

@H_301_30@.setLocations(this.resourceProperties.getFaviconLocations());

@H_301_30@return requestHandler;

@H_301_30@}

@H_301_30@ 

@H_301_30@}

(1). 所有/webjars/**,都去 classpath:/Meta-INF/resources/webjars/ 找资源；webjars：以jar包的方式引入静态资源

http://www.webjars.org/

@H_301_30@ 

@H_301_30@<!--引入jquery-webjar 在访问的时候只需要写webjars下面资源的名称即可 -->

@H_301_30@<dependency>

@H_301_30@   <groupId>org.webjars</groupId>

@H_301_30@   <artifactId>jquery</artifactId>

@H_301_30@   <version>3.3.1</version>

@H_301_30@</dependency>

@H_871_403@访问：localhost:8080/webjars/jquery/3.3.1/jquery.js

(2)."/**" 访问当前项目的任何资源，到'静态资源文件夹'找映射

@H_301_30@"classpath:/Meta-INF/resources/",

@H_301_30@"classpath:/resources/",

@H_301_30@"classpath:/static/",

@H_301_30@"classpath:/public/"

@H_301_30@"/"：当前项目的根路径
@H_301_30@访问：http://localhost:8080/asserts/js/Chart.min.js

@H_301_30@ 

@H_301_30@localhost:8080/abc ---> 去静态资源文件夹里面找abc

(3).index页； 静态资源文件夹下的所有index.html页面；被"/**"映射；

访问:localhost:8080/

@H_301_30@ 

(4). 图标**/favicon.ico都在静态资源文件下找

@H_301_30@

 

3.模板引擎

  JSP、Velocity、Freemarker、Thymeleaf

@H_301_30@ 

  SpringBoot推荐使用的Thymeleaf,语法更简单，功能更强大.

(1).引入thymeleaf

@H_301_30@<dependency>

@H_301_30@<groupId>org.springframework.boot</groupId>

@H_301_30@<artifactId>spring-boot-starter-thymeleaf</artifactId>

@H_301_30@           <!--2.1.6-->

@H_301_30@</dependency>

@H_301_30@切换thymeleaf版本

@H_301_30@<properties>

@H_301_30@<thymeleaf.version>3.0.9.RELEASE</thymeleaf.version>

@H_301_30@<!-- 布局功能的支持程序  thymeleaf3主程序  layout2以上版本 -->

@H_301_30@<!-- thymeleaf2   layout1-->

@H_301_30@<thymeleaf-layout-dialect.version>2.2.2</thymeleaf-layout-dialect.version>

@H_301_30@  </properties>
@H_301_30@ 

(2).使用thymeleaf

@H_301_30@@ConfigurationProperties(prefix = "spring.thymeleaf")

@H_301_30@public class ThymeleafProperties {

@H_301_30@ 

@H_301_30@private static final Charset DEFAULT_ENCODING = Charset.forName("UTF-8");

@H_301_30@ 

@H_301_30@private static final MimeType DEFAULT_CONTENT_TYPE = MimeType.valueOf("text/html");

@H_301_30@ 

@H_301_30@public static final String DEFAULT_PREFIX = "classpath:/templates/";

@H_301_30@ 

@H_301_30@public static final String DEFAULT_SUFFIX = ".html";

@H_301_30@   //

  @H_871_403@把HTML页面放在classpath:/templates/，thymeleaf就能自动渲染;

@H_301_30@开发文档

@H_301_30@ 

[1].添加名称空间

@H_301_30@ 

@H_301_30@xmlns:th="http://www.thymeleaf.org"

[2].使用thymeleaf语法  

@H_301_30@<!DOCTYPE html>

@H_301_30@<html lang="en" xmlns:th="http://www.thymeleaf.org">

@H_301_30@<head>

@H_301_30@    <Meta charset="UTF-8">

@H_301_30@    <title>Title</title>

@H_301_30@</head>

@H_301_30@<body>

@H_301_30@    <h1>成功！</h1>

@H_301_30@    <!--th:text 将div里面的文本内容设置为 -->

@H_301_30@    <div th:text="${hello}">这是显示欢迎信息</div>

@H_301_30@</body>

@H_301_30@</html>

(3).thymeleaf语法

@H_301_30@ 

[1].th:text：改变当前元素里面的文本内容

th:任意html属性；来替换原生属性的值

@H_301_30@ 

[2].表达式

@H_301_30@ 

@H_301_30@Simple expressions:（表达式语法）

@H_301_30@    Variable Expressions: ${...}：获取变量值；OGNL；

@H_301_30@     1）、获取对象的属性、调用方法

@H_301_30@     2）、使用内置的基本对象：

@H_301_30@     #ctx : the context object.

@H_301_30@     #vars: the context variables.

@H_301_30@                #locale : the context locale.

@H_301_30@                #request : (only in Web Contexts) the HttpServletRequest object.

@H_301_30@                #response : (only in Web Contexts) the HttpServletResponse object.

@H_301_30@                #session : (only in Web Contexts) the HttpSession object.

@H_301_30@                #servletContext : (only in Web Contexts) the ServletContext object.

@H_301_30@                

@H_301_30@                ${session.foo}

@H_301_30@            3）、内置的一些工具对象：

@H_301_30@#execInfo : information about the template being processed.

@H_301_30@#messages : methods for obtaining externalized messages inside variables expressions,in the same way as they would be obtained using #{…} Syntax.

@H_301_30@#uris : methods for escaping parts of URLs/URIs

@H_301_30@#conversions : methods for executing the configured conversion service (if any).

@H_301_30@#dates : methods for java.util.Date objects: formatting,component extraction,etc.

@H_301_30@#calendars : analogous to #dates,but for java.util.Calendar objects.

@H_301_30@#numbers : methods for formatting numeric objects.

@H_301_30@#strings : methods for String objects: contains,startsWith,prepending/appending,etc.

@H_301_30@#objects : methods for objects in general.

@H_301_30@#bools : methods for boolean evaluation.

@H_301_30@#arrays : methods for arrays.

@H_301_30@#lists : methods for lists.

@H_301_30@#sets : methods for sets.

@H_301_30@#maps : methods for maps.

@H_301_30@#aggregates : methods for creating aggregates on arrays or collections.

@H_301_30@#ids : methods for dealing with id attributes that might be repeated (for example,as a result of an iteration).

@H_301_30@ 

@H_301_30@    Selection Variable Expressions: *{...}：选择表达式：和${}在功能上是一样；

@H_301_30@     补充：配合 th:object="${session.user}：

@H_301_30@   <div th:object="${session.user}">

@H_301_30@    <p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>

@H_301_30@    <p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>

@H_301_30@    <p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>

@H_301_30@    </div>

@H_301_30@    

@H_301_30@    Message Expressions: #{...}：获取国际化内容

@H_301_30@    Link URL Expressions: @{...}：定义URL；

@H_301_30@     @{/order/process(execId=${execId},execType='FAST')}

@H_301_30@    Fragment Expressions: ~{...}：片段引用表达式

@H_301_30@     <div th:insert="~{commons :: main}">...</div>

@H_301_30@    

@H_301_30@Literals（字面量）

@H_301_30@      Text literals: 'one text','Another one!',…

@H_301_30@      Number literals: 0,34,3.0,12.3,…

@H_301_30@      Boolean literals: true,false

@H_301_30@      Null literal: null

@H_301_30@      Literal tokens: one,sometext,main,…

@H_301_30@Text operations:（文本操作）

@H_301_30@    String concatenation: +

@H_301_30@    Literal substitutions: |The name is ${name}|

@H_301_30@Arithmetic operations:（数学运算）

@H_301_30@    Binary operators: +,-,*,/,%

@H_301_30@    Minus sign (unary operator): -

@H_301_30@Boolean operations:（布尔运算）

@H_301_30@    Binary operators: and,or

@H_301_30@    Boolean negation (unary operator): !,not

@H_301_30@Comparisons and equality:（比较运算）

@H_301_30@    Comparators: >,<,>=,<= ( gt,lt,ge,le )

@H_301_30@    Equality operators: ==,!= ( eq,ne )

@H_301_30@Conditional operators:条件运算（三元运算符）

@H_301_30@    If-then: (if) ? (then)

@H_301_30@    If-then-else: (if) ? (then) : (else)

@H_301_30@    Default: (value) ?: (defaultvalue)

@H_301_30@Special tokens:

@H_301_30@    No-Operation: _

 

4.SpringMVC自动配置

官方文档

@H_301_30@ 

(1).Spring MVC auto-configuration

  Spring Boot 自动配置SpringMVC

  SpringBoot对SpringMVC的默认配置(WebMvcAutoConfiguration)

@H_301_30@ Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans.

@H_301_30@ @H_871_403@自动配置了ViewResolver（视图解析器：根据方法的返回值得到视图对象（View），视图对象决定如何渲染（转发？重定向？））

@H_301_30@ ContentNegotiatingViewResolver:组合所有的视图解析器的

@H_301_30@ 如何定制：我们可以自己给容器中添加一个视图解析器；自动的将其组合进来；

@H_301_30@ Support for serving static resources,including support for WebJars (see below).

@H_301_30@ @H_871_403@静态资源文件夹路径,webjars

@H_301_30@ Automatic registration of Converter, GenericConverter, Formatter beans.

@H_301_30@ Converter：转换器；  public String hello(User user)：类型转换使用Converter

@H_301_30@ Formatter格式化器；  2017.12.17===Date；

@H_301_30@@Bean

@H_301_30@@ConditionalOnProperty(prefix = "spring.mvc",name = "date-format")//在文件中配置日期格式化的规则

@H_301_30@public Formatter<Date> dateFormatter() {

@H_301_30@return new DateFormatter(this.mvcProperties.getDateFormat());//日期格式化组件

@H_301_30@}
@H_301_30@ 自己添加的格式化器转换器，我们只需要放在容器中即可

@H_301_30@ Support for HttpMessageConverters (see below).

@H_301_30@ HttpMessageConverter：SpringMVC用来转换Http请求和响应的；User--->Json；

@H_301_30@ `HttpMessageConverters` 是从容器中确定；获取所有的HttpMessageConverter；

@H_301_30@ @H_871_403@自己给容器中添加HttpMessageConverter，只需要将自己的组件注册容器中（@Bean,@Component）

@H_301_30@ Automatic registration of MessageCodesResolver (see below).

@H_301_30@ 定义错误代码生成规则

@H_301_30@ Static index.html support.

@H_301_30@ 静态首页访问

@H_301_30@ Custom Favicon support (see below).

@H_301_30@  @H_871_403@自定义favicon.ico 图标

@H_301_30@ Automatic use of a ConfigurableWebBindingInitializer bean (see below).

@H_301_30@ @H_871_403@我们可以配置一个ConfigurableWebBindingInitializer来替换默认的；（添加到容器）

@H_301_30@初始化WebDataBinder；

@H_301_30@请求数据=====JavaBean；
@H_301_30@org.springframework.boot.autoconfigure.web：web所有自动场景；

@H_301_30@If you want to keep Spring Boot MVC features,and you just want to add additional MVC configuration (interceptors,formatters,view controllers etc.) you can add your own @Configuration class of type WebMvcConfigurerAdapter,but without @EnableWebMvc. If you wish to provide custom instances of RequestMappingHandlerMapping, RequestMappingHandlerAdapter or ExceptionHandlerExceptionResolver you can declare a WebMvcRegistrationsAdapter instance providing such components.

(2).扩展SpringMVC

@H_301_30@   <mvc:view-controller path="/hello" view-name="success"/>

@H_301_30@    <mvc:interceptors>

@H_301_30@        <mvc:interceptor>

@H_301_30@            <mvc:mapping path="/hello"/>

@H_301_30@            <bean></bean>

@H_301_30@        </mvc:interceptor>

@H_301_30@    </mvc:interceptors>

  @H_871_403@编写配置类（@Configuration），是WebMvcConfigurerAdapter类型；不能标注@EnableWebMvc;

  @H_871_403@在保留所有的自动配置情况下，也能用我们扩展的配置

@H_301_30@//使用 WebMvcConfigurer可以来扩展SpringMVC功能

@H_301_30@//因为WebMvcConfigurerAdapter已经过时，所以我们使用接口WebMvcConfigurer替代

@H_301_30@@Configuration

@H_301_30@public class MyMvcConfig  implements WebMvcConfigurer {

@H_301_30@    @Override

@H_301_30@    public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@        //super.addViewControllers(registry)

@H_301_30@        //浏览器发送/pluto请求来到success

@H_301_30@        registry.addViewController("/pluto").setViewName("success");

@H_301_30@    }

@H_301_30@}

原理解析：

[1].WebMvcAutoConfiguration是SpringMVC自动配置类

[2].在做其他自动配置时会导入@Import(EnableWebMvcConfiguration.class)

@H_301_30@  

@H_301_30@   @Configuration

@H_301_30@public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration {

@H_301_30@      private final WebMvcConfigurerComposite configurers = new WebMvcConfigurerComposite();

@H_301_30@ 

@H_301_30@//从容器中获取所有的WebMvcConfigurer

@H_301_30@      @Autowired(required = false)

@H_301_30@      public void setConfigurers(List<WebMvcConfigurer> configurers) {

@H_301_30@          if (!CollectionUtils.isEmpty(configurers)) {

@H_301_30@              this.configurers.addWebMvcConfigurers(configurers);

@H_301_30@             //一个参考实现；将所有的WebMvcConfigurer相关配置都来一起调用；  

@H_301_30@             @Override

@H_301_30@             // public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@              //    for (WebMvcConfigurer delegate : this.delegates) {

@H_301_30@               //       delegate.addViewControllers(registry);

@H_301_30@               //   }

@H_301_30@              }

@H_301_30@          }

@H_301_30@}

[3].容器中所有的WebMvcConfigurer都会一起起作用

[4].手写的配置类也会被调用

@H_871_403@结果：SpringMVC的自动配置和手写的扩展配置都起作用；

(3).全面接管SpringMVC

  SpringBoot对SpringMVC的自动配置不需要；自己配置所有配置；所有的SpringMVC自动配置使其失效。

  @H_871_403@需要在配置类中添加@EnableWebMvc即可；

@H_301_30@//使用 WebMvcConfigurer可以来扩展SpringMVC功能

@H_301_30@//因为WebMvcConfigurerAdapter已经过时，所以我们使用接口WebMvcConfigurer替代

@H_301_30@@EnableWebMvc

@H_301_30@@Configuration

@H_301_30@public class MyMvcConfig  implements WebMvcConfigurer {

@H_301_30@    @Override

@H_301_30@    public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@        //super.addViewControllers(registry)

@H_301_30@        //浏览器发送/pluto请求来到success

@H_301_30@        registry.addViewController("/pluto").setViewName("success");

@H_301_30@    }

@H_301_30@}

@H_871_403@原理解析：@EnableWebMvc自动配置失效

[1].@EnableWebMvc的核心

@H_301_30@ 

@H_301_30@@Retention(RetentionPolicy.RUNTIME)

@H_301_30@@Target({ElementType.TYPE})

@H_301_30@@Documented

@H_301_30@@Import({DelegatingWebMvcConfiguration.class})

@H_301_30@public @interface EnableWebMvc {

@H_301_30@}

[2].DelegatingWebMvcConfiguration

@H_301_30@ 

@H_301_30@@Configuration(

@H_301_30@    proxyBeanMethods = false

@H_301_30@)

@H_301_30@public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport {

[3].WebMvcAutoConfiguration

@H_301_30@@Configuration(

@H_301_30@    proxyBeanMethods = false

@H_301_30@)

@H_301_30@@ConditionalOnWebApplication(

@H_301_30@    type = Type.SERVLET

@H_301_30@)

@H_301_30@@ConditionalOnClass({Servlet.class,DispatcherServlet.class,WebMvcConfigurer.class})

@H_301_30@//容器中没有这个组件的时候，这个自动配置类才生效

@H_301_30@@ConditionalOnMissingBean({WebMvcConfigurationSupport.class})

@H_301_30@@AutoConfigureOrder(-2147483638)

@H_301_30@@AutoConfigureAfter({DispatcherServletAutoConfiguration.class,TaskExecutionAutoConfiguration.class,ValidationAutoConfiguration.class})

@H_301_30@public class WebMvcAutoConfiguration {

[4].@EnableWebMvc将WebMvcConfigurationSupport组件导入进来

[5].导入的WebMvcConfigurationSupport只是SpringMVC最基本的功能

5.修改SpringBoot的默认配置

@H_301_30@模式：

(1).SpringBoot在自动配置很多组件的时候，先看容器中有没有用户自己配置的（@Bean、@Component）如果有就用用户配置的，如果没有，才自动配置；如果有些组件可以有多个（ViewResolver）将用户配置的和自己默认的组合起来；

(2).在SpringBoot中有非常多的xxxConfigurer帮助我们进行扩展配置

(3).在SpringBoot中v  有很多的xxxCustomizer帮助我们进行定制配置

6.RestfulCRUD

(1).访问首页(默认)

@H_301_30@//使用 WebMvcConfigurer可以来扩展SpringMVC功能

@H_301_30@//因为WebMvcConfigurerAdapter已经过时，所以我们使用接口WebMvcConfigurer替代

@H_301_30@//@EnableWebMvc

@H_301_30@@Configuration

@H_301_30@public class MyMvcConfig implements WebMvcConfigurer {

@H_301_30@    @Override

@H_301_30@    public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@        //super.addViewControllers(registry)

@H_301_30@        //浏览器发送/pluto请求来到success

@H_301_30@        registry.addViewController("/pluto").setViewName("success");

@H_301_30@    }

@H_301_30@ 

@H_301_30@    //所有的WebMvcConfigurer组件会一起起作用

@H_301_30@    //@Bean将组件注册在容器中

@H_301_30@    @Bean

@H_301_30@ 

@H_301_30@    public WebMvcConfigurer webMvcConfigurer(){

@H_301_30@        WebMvcConfigurer  dapter = new WebMvcConfigurer() {

@H_301_30@            @Override

@H_301_30@            public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@                registry.addViewController("/").setViewName("login");

@H_301_30@                registry.addViewController("/index.html").setViewName("login");

@H_301_30@            }

@H_301_30@        };

@H_301_30@       return dapter;

@H_301_30@    }

@H_301_30@}

(2).国际化

[1].编写国际化配置文件

[2].使用ResourceBundleMessageSource管理国际化资源文件

[3].在页面使用fmt:message取出国际化内容

实现步骤：

[1].编写国际化配置文件

@H_301_30@#login_zh_CN.properties

@H_301_30@login.btn=登录

@H_301_30@login.password=密码

@H_301_30@login.remember=记住我

@H_301_30@login.tip=请登录

@H_301_30@login.username=用户名

@H_301_30@ 

@H_301_30@#login_en_US.properties

@H_301_30@login.btn=Sing In

@H_301_30@login.password=Password

@H_301_30@login.remember=remember me

@H_301_30@login.tip=Please sign in

@H_301_30@login.username=UserName

@H_301_30@ 

@H_301_30@#login.properties

@H_301_30@login.btn=登录~

@H_301_30@login.password=密码~

@H_301_30@login.remember=记住我~

@H_301_30@login.tip=请登录~

@H_301_30@login.username=用户名~
@H_301_30@ 

[2].SpringBoot自动配置好了管理国际化资源文件的组件

@H_301_30@@ConfigurationProperties(prefix = "spring.messages")

@H_301_30@public class MessageSourceAutoConfiguration {

@H_301_30@    

@H_301_30@    /**

@H_301_30@* Comma-separated list of basenames (essentially a fully-qualified classpath

@H_301_30@* location),each following the ResourceBundle convention with relaxed support for

@H_301_30@* slash based locations. If it doesn't contain a package qualifier (such as

@H_301_30@* "org.mypackage"),it will be resolved from the classpath root.

@H_301_30@*/

@H_301_30@private String basename = "messages";  

@H_301_30@    //我们的配置文件可以直接放在类路径下叫messages.properties；

@H_301_30@    

@H_301_30@    @Bean

@H_301_30@public MessageSource messageSource() {

@H_301_30@ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();

@H_301_30@if (StringUtils.hasText(this.basename)) {

@H_301_30@            //设置国际化资源文件的基础名（去掉语言国家代码的）

@H_301_30@messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(

@H_301_30@StringUtils.trimAllWhitespace(this.basename)));

@H_301_30@}

@H_301_30@if (this.encoding != null) {

@H_301_30@messageSource.setDefaultEncoding(this.encoding.name());

@H_301_30@}

@H_301_30@messageSource.setFallbackToSystemLocale(this.fallbackToSystemLocale);

@H_301_30@messageSource.setCacheSeconds(this.cacheSeconds);

@H_301_30@messageSource.setAlwaysUseMessageFormat(this.alwaysUseMessageFormat);

@H_301_30@return messageSource;

@H_301_30@}

[3].取出国际化内容

@H_301_30@<!DOCTYPE html>

@H_301_30@<html lang="en" xmlns:th="http://www.thymeleaf.org">

@H_301_30@   <head>

@H_301_30@      <Meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

@H_301_30@      <Meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">

@H_301_30@      <Meta name="description" content="">

@H_301_30@      <Meta name="author" content="">

@H_301_30@      <title>Signin Template for Bootstrap</title>

@H_301_30@      <!-- Bootstrap core CSS -->

@H_301_30@      <link href="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">

@H_301_30@      <!-- Custom styles for this template -->

@H_301_30@      <link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">

@H_301_30@   </head>

@H_301_30@ 

@H_301_30@   <body class="text-center">

@H_301_30@      <form class="form-signin" action="dashboard.html">

@H_301_30@         <img class="mb-4" th:src="@{asserts/img/bootstrap-solid.svg}" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">

@H_301_30@         <h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>

@H_301_30@         <label class="sr-only" th:text="#{login.username}">Username</label>

@H_301_30@         <input type="text" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus="">

@H_301_30@         <label class="sr-only" th:text="#{login.password}">Password</label>

@H_301_30@         <input type="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required="">

@H_301_30@         <div class="checkBox mb-3">

@H_301_30@            <label>

@H_301_30@          <input type="checkBox" value="remember-me"> [[#{login.remember}]]

@H_301_30@        </label>

@H_301_30@         </div>

@H_301_30@         <button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>

@H_301_30@         <p class="mt-5 mb-3 text-muted">© 2017-2018</p>

@H_301_30@         <a class="btn btn-sm">中文</a>

@H_301_30@         <a class="btn btn-sm">English</a>

@H_301_30@      </form>

@H_301_30@ 

@H_301_30@   </body>

@H_301_30@ 

@H_301_30@</html>

  @H_871_403@如果出现乱码的现象，那么只需要重新改下编码就行。可以设置全局配置，也可以设置项目配置。以下是全局配置

@H_301_30@ 

  @H_871_403@效果：根据浏览器语言设置的信息切换了国际化

@H_871_403@原理解析：国际化Locale(区域信息对象)；LocaleResolver(获取区域信息对象)

@H_301_30@@Bean

@H_301_30@@ConditionalOnMissingBean

@H_301_30@@ConditionalOnProperty(prefix = "spring.mvc",name = "locale")

@H_301_30@public LocaleResolver localeResolver() {

@H_301_30@if (this.mvcProperties

@H_301_30@.getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {

@H_301_30@return new FixedLocaleResolver(this.mvcProperties.getLocale());

@H_301_30@}

@H_301_30@AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();

@H_301_30@localeResolver.setDefaultLocale(this.mvcProperties.getLocale());

@H_301_30@return localeResolver;

@H_301_30@}

@H_301_30@默认的就是根据请求头带来的区域信息获取Locale进行国际化

[4].点击链接切换国际化

@H_301_30@/**

@H_301_30@ * 可以在连接上携带区域信息

@H_301_30@ */

@H_301_30@public class MyLocaleResolver implements LocaleResolver {

@H_301_30@    

@H_301_30@    @Override

@H_301_30@    public Locale resolveLocale(HttpServletRequest request) {

@H_301_30@        String l = request.getParameter("l");

@H_301_30@        Locale locale = Locale.getDefault();

@H_301_30@        if(!StringUtils.isEmpty(l)){

@H_301_30@            String[] split = l.split("_");

@H_301_30@            locale = new Locale(split[0],split[1]);

@H_301_30@        }

@H_301_30@        return locale;

@H_301_30@    }

@H_301_30@ 

@H_301_30@    @Override

@H_301_30@    public void setLocale(HttpServletRequest request,HttpServletResponse response,Locale locale) {

@H_301_30@ 

@H_301_30@    }

@H_301_30@}

@H_301_30@ 

@H_301_30@ 

@H_301_30@ @Bean

@H_301_30@    public LocaleResolver localeResolver(){

@H_301_30@        return new MyLocaleResolver();

@H_301_30@    }

@H_301_30@}

(3).登录

  @H_871_403@开发期间模板引擎页面修改以后，如果想实时生效,需要执行以下两个步骤

[1].禁用模板引擎的缓存

@H_301_30@# 禁用缓存

@H_301_30@spring.thymeleaf.cache=false

[2].重新编译

@H_301_30@页面修改完成以后ctrl+f9
@H_301_30@ 

@H_301_30@登陆错误消息的显示

@H_301_30@<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

防止表单重复提交的办法：重定向

@H_301_30@#LoginController.java

@H_301_30@if(!StringUtils.isEmpty(username)&& "123456".equals(password)){

@H_301_30@    //登录成功 防止表单重复提交，可以重定向到主页

@H_301_30@    return "redirect:/main.html";
@H_301_30@#MyMvcConfig.java

@H_301_30@//所有的WebMvcConfigurer组件会一起起作用

@H_301_30@//@Bean将组件注册在容器中

@H_301_30@@Bean

@H_301_30@public WebMvcConfigurer webMvcConfigurer(){

@H_301_30@    WebMvcConfigurer  dapter = new WebMvcConfigurer() {

@H_301_30@        @Override

@H_301_30@        public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@            registry.addViewController("/").setViewName("login");

@H_301_30@            registry.addViewController("/index.html").setViewName("login");

@H_301_30@            registry.addViewController("/main.html").setViewName("dashboard");

@H_301_30@        }

@H_301_30@    };

@H_301_30@   return dapter;

@H_301_30@}

(4).拦截器进行登陆检查

[1].拦截器

@H_301_30@/**

@H_301_30@ * 登录检查

@H_301_30@ */

@H_301_30@public class LoginHandlerInterceptor implements HandlerInterceptor{

@H_301_30@    //目标方法执行之前

@H_301_30@    @Override

@H_301_30@    public boolean preHandle(HttpServletRequest request,Object handler) throws Exception {

@H_301_30@        Object user = request.getSession().getAttribute("loginUser");

@H_301_30@        if(user==null){

@H_301_30@            //未登录 返回登录页面

@H_301_30@            request.setAttribute("msg","没有权限请先登录");

@H_301_30@            request.getRequestDispatcher("/index.html").forward(request,response);

@H_301_30@            return false;

@H_301_30@        }else {

@H_301_30@            //已登录 放行请求

@H_301_30@            return true;

@H_301_30@        }

@H_301_30@    }

@H_301_30@}

[2].注册拦截器

@H_301_30@//所有的WebMvcConfigurer组件会一起起作用

@H_301_30@//@Bean将组件注册在容器中

@H_301_30@@Bean

@H_301_30@public WebMvcConfigurer webMvcConfigurer(){

@H_301_30@    WebMvcConfigurer  dapter = new WebMvcConfigurer() {

@H_301_30@        @Override

@H_301_30@        public void addViewControllers(ViewControllerRegistry registry) {

@H_301_30@            registry.addViewController("/").setViewName("login");

@H_301_30@            registry.addViewController("/index.html").setViewName("login");

@H_301_30@            registry.addViewController("/main.html").setViewName("dashboard");

@H_301_30@        }

@H_301_30@ 

@H_301_30@        //注册拦截器

@H_301_30@        @Override

@H_301_30@        public void addInterceptors(InterceptorRegistry registry) {

@H_301_30@            //super.addInterceptors(registry);

@H_301_30@            //静态资源 *.css *.js

@H_301_30@            //springboot已经做了静态资源映射

@H_301_30@            registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")

@H_301_30@                    .excludePathPatterns("/index.html","/","/user/login");

@H_301_30@        }

@H_301_30@ 

@H_301_30@    };

@H_301_30@ 

@H_301_30@ 

@H_301_30@   return dapter;

@H_301_30@}

(5).CRUD-员工列表

[1].需求分析

  RestfulCRUD：CRUD满足Rest风格；

  URI:/资源名称/资源标识  HTTP请求方式区分对资源CRUD操作

@H_301_30@ 

 

普通CRUD（uri来区分操作）

RestfulCRUD

查询

getEmp

emp---GET

添加

addEmp?xxx

emp---POST

修改

updateEmp?id=xxx&xxx=xx

emp/{id}---PUT

删除

deleteEmp?id=1

emp/{id}---DELETE

[2].实验的请求架构

@H_301_30@实验功能

 @H_301_30@请求URI

 @H_301_30@请求方式
@H_301_30@查询所有员工

 @H_301_30@emps

 @H_301_30@GET
@H_301_30@查询某个员工(来到修改页面)

 @H_301_30@emp/1

 @H_301_30@GET
@H_301_30@来到添加页面

 @H_301_30@emp

 @H_301_30@GET
@H_301_30@添加员工

 @H_301_30@emp

 @H_301_30@POST
@H_301_30@来到修改页面（查出员工进行信息回显）

 @H_301_30@emp/1

 @H_301_30@GET
@H_301_30@修改员工

 @H_301_30@emp

 @H_301_30@PUT
@H_301_30@删除员工

 @H_301_30@emp/1

 @H_301_30@DELETE

[3].员工列表

  thymeleaf公共页面元素抽取

@H_301_30@1、抽取公共片段

@H_301_30@<div th:fragment="copy">

@H_301_30@© 2011 The Good Thymes Virtual Grocery

@H_301_30@</div>

@H_301_30@ 

@H_301_30@2、引入公共片段

@H_301_30@<div th:insert="~{footer :: copy}"></div>

@H_301_30@~{templatename::selector}：模板名::选择器

@H_301_30@~{templatename::fragmentname}:模板名::片段名

@H_301_30@ 

@H_301_30@3、默认效果：

@H_301_30@insert的公共片段在div标签中

@H_301_30@如果使用th:insert等属性进行引入，可以不用写~{}：

@H_301_30@行内写法可以加上：[[~{}]];[(~{})]；
@H_301_30@@H_871_403@三种引入公共片段的th属性:

@H_301_30@  th:insert：将公共片段整个插入到声明引入的元素中

@H_301_30@  th:replace：将声明引入的元素替换为公共片段

@H_301_30@  th:include：将被引入的片段的内容包含进这个标签中

@H_301_30@<footer th:fragment="copy">

@H_301_30@© 2011 The Good Thymes Virtual Grocery

@H_301_30@</footer>

@H_301_30@ 

@H_301_30@引入方式

@H_301_30@<div th:insert="footer :: copy"></div>

@H_301_30@<div th:replace="footer :: copy"></div>

@H_301_30@<div th:include="footer :: copy"></div>

@H_301_30@ 

@H_301_30@效果

@H_301_30@<div>

@H_301_30@    <footer>

@H_301_30@    © 2011 The Good Thymes Virtual Grocery

@H_301_30@    </footer>

@H_301_30@</div>

@H_301_30@ 

@H_301_30@<footer>

@H_301_30@© 2011 The Good Thymes Virtual Grocery

@H_301_30@</footer>

@H_301_30@ 

@H_301_30@<div>

@H_301_30@© 2011 The Good Thymes Virtual Grocery

@H_301_30@</div>

 

 

引入片段的时候传入参数

@H_301_30@<nav class="col-md-2 d-none d-md-block bg-light sidebar" id="sidebar">

@H_301_30@    <div class="sidebar-sticky">

@H_301_30@        <ul class="nav flex-column">

@H_301_30@            <li class="nav-item">

@H_301_30@                <a class="nav-link active"

@H_301_30@                   th:class="${activeUri=='main.html'?'nav-link active':'nav-link'}"

@H_301_30@                   href="#" th:href="@{/main.html}">

@H_301_30@                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-home">

@H_301_30@                        <path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"></path>

@H_301_30@                        <polyline points="9 22 9 12 15 12 15 22"></polyline>

@H_301_30@                    </svg>

@H_301_30@                    Dashboard <span class="sr-only">(current)</span>

@H_301_30@                </a>

@H_301_30@            </li>

@H_301_30@ 

@H_301_30@<!--引入侧边栏;传入参数-->

@H_301_30@<div th:replace="commons/bar::#sidebar(activeUri='emps')"></div>

(6).CRUD-员工添加

templates/emp/add.html

@H_301_30@<form>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>LastName</label>

@H_301_30@        <input type="text" class="form-control" placeholder="zhangsan">

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>Email</label>

@H_301_30@        <input type="email" class="form-control" placeholder="zhangsan@atguigu.com">

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>Gender</label><br/>

@H_301_30@        <div class="form-check form-check-inline">

@H_301_30@            <input class="form-check-input" type="radio" name="gender"  value="1">

@H_301_30@            <label class="form-check-label">男</label>

@H_301_30@        </div>

@H_301_30@        <div class="form-check form-check-inline">

@H_301_30@            <input class="form-check-input" type="radio" name="gender"  value="0">

@H_301_30@            <label class="form-check-label">女</label>

@H_301_30@        </div>

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>department</label>

@H_301_30@        <select class="form-control">

@H_301_30@            <option>1</option>

@H_301_30@            <option>2</option>

@H_301_30@            <option>3</option>

@H_301_30@            <option>4</option>

@H_301_30@            <option>5</option>

@H_301_30@        </select>

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>Birth</label>

@H_301_30@        <input type="text" class="form-control" placeholder="zhangsan">

@H_301_30@    </div>

@H_301_30@    <button type="submit" class="btn btn-primary">添加</button>

@H_301_30@</form>

[1].格式问题

  若提交的日期格式不对，则会出现404

@H_301_30@ 

  SpringMVC将页面提交的值需要转换为指定的类型

@H_301_30@spring:

@H_301_30@  mvc:

@H_301_30@    format:

@H_301_30@      date: yyyy-MM-dd

(7).CRUD-员工修改

@H_301_30@<!--需要区分是员工修改还是添加；-->

@H_301_30@<form th:action="@{/emp}" method="post">

@H_301_30@    <!--发送put请求修改员工数据-->

@H_301_30@    <!--

@H_301_30@1、SpringMVC中配置HiddenHttpMethodFilter;（SpringBoot自动配置好的）

@H_301_30@2、页面创建一个post表单

@H_301_30@3、创建一个input项，name="_method";值就是我们指定的请求方式

@H_301_30@-->

@H_301_30@    <input type="hidden" name="_method" value="put" th:if="${emp!=null}"/>

@H_301_30@    <input type="hidden" name="id" th:if="${emp!=null}" th:value="${emp.id}">

@H_301_30@    <div class="form-group">

@H_301_30@        <label>LastName</label>

@H_301_30@        <input name="lastName" type="text" class="form-control" placeholder="zhangsan" th:value="${emp!=null}?${emp.lastName}">

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>Email</label>

@H_301_30@        <input name="email" type="email" class="form-control" placeholder="zhangsan@atguigu.com" th:value="${emp!=null}?${emp.email}">

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>Gender</label><br/>

@H_301_30@        <div class="form-check form-check-inline">

@H_301_30@            <input class="form-check-input" type="radio" name="gender" value="1" th:checked="${emp!=null}?${emp.gender==1}">

@H_301_30@            <label class="form-check-label">男</label>

@H_301_30@        </div>

@H_301_30@        <div class="form-check form-check-inline">

@H_301_30@            <input class="form-check-input" type="radio" name="gender" value="0" th:checked="${emp!=null}?${emp.gender==0}">

@H_301_30@            <label class="form-check-label">女</label>

@H_301_30@        </div>

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>department</label>

@H_301_30@        <!--提交的是部门的id-->

@H_301_30@        <select class="form-control" name="department.id">

@H_301_30@            <option th:selected="${emp!=null}?${dept.id == emp.department.id}" th:value="${dept.id}" th:each="dept:${depts}" th:text="${dept.departmentName}">1</option>

@H_301_30@        </select>

@H_301_30@    </div>

@H_301_30@    <div class="form-group">

@H_301_30@        <label>Birth</label>

@H_301_30@        <input name="birth" type="text" class="form-control" placeholder="zhangsan" th:value="${emp!=null}?${#dates.format(emp.birth,'yyyy-MM-dd HH:mm')}">

@H_301_30@    </div>

@H_301_30@    <button type="submit" class="btn btn-primary" th:text="${emp!=null}?'修改':'添加'">添加</button>

@H_301_30@</form>

(8).CRUD-员工删除

@H_301_30@<tr th:each="emp:${emps}">

@H_301_30@    <td th:text="${emp.id}"></td>

@H_301_30@    <td>[[${emp.lastName}]]</td>

@H_301_30@    <td th:text="${emp.email}"></td>

@H_301_30@    <td th:text="${emp.gender}==0?'女':'男'"></td>

@H_301_30@    <td th:text="${emp.department.departmentName}"></td>

@H_301_30@    <td th:text="${#dates.format(emp.birth,'yyyy-MM-dd HH:mm')}"></td>

@H_301_30@    <td>

@H_301_30@        <a class="btn btn-sm btn-primary" th:href="@{/emp/}+${emp.id}">编辑</a>

@H_301_30@        <button th:attr="del_uri=@{/emp/}+${emp.id}" class="btn btn-sm btn-danger deleteBtn">删除</button>

@H_301_30@    </td>

@H_301_30@</tr>

@H_301_30@ 

@H_301_30@ 

@H_301_30@<script>

@H_301_30@    $(".deleteBtn").click(function(){

@H_301_30@        //删除当前员工的

@H_301_30@        $("#deleteEmpForm").attr("action",$(this).attr("del_uri")).submit();

@H_301_30@        return false;

@H_301_30@    });

@H_301_30@</script>

 7.错误处理机制

(1).SpringBoot默认的错误处理机制

[1].默认效果

  @H_871_403@浏览器:返回一个默认的错误页面

@H_301_30@ 

  @H_871_403@浏览器发送请求的请求头

@H_301_30@ 

  @H_871_403@其它客户端:默认响应一个json数据

@H_301_30@ 

@H_301_30@ 

@H_301_30@ 

[2].原理

  ErrorMvcAutoConfiguration:错误处理自动配置

@H_301_30@ 

1].DefaultErrorAttributes

@H_301_30@

@H_301_30@帮我们在页面共享信息；

@H_301_30@@Override

@H_301_30@public Map<String,Object> getErrorAttributes(RequestAttributes requestAttributes,

@H_301_30@boolean includeStackTrace) {

@H_301_30@Map<String,Object> errorAttributes = new LinkedHashMap<String,Object>();

@H_301_30@errorAttributes.put("timestamp",new Date());

@H_301_30@addStatus(errorAttributes,requestAttributes);

@H_301_30@addErrorDetails(errorAttributes,requestAttributes,includeStackTrace);

@H_301_30@addPath(errorAttributes,requestAttributes);

@H_301_30@return errorAttributes;

@H_301_30@}

2].BasicErrorController

@H_301_30@ 

@H_301_30@@Controller

@H_301_30@@RequestMapping({"${server.error.path:${error.path:/error}}"})

@H_301_30@public class BasicErrorController extends AbstractErrorController {

@H_301_30@    private final ErrorProperties errorProperties;
@H_301_30@#产生html类型的数据,浏览器发送的请求来到这个方法处理

@H_301_30@@RequestMapping(

@H_301_30@    produces = {"text/html"}

@H_301_30@)

@H_301_30@public ModelAndView errorHtml(HttpServletRequest request,HttpServletResponse response) {

@H_301_30@    HttpStatus status = this.getStatus(request);

@H_301_30@    Map<String,Object> model = Collections.unmodifiableMap(this.getErrorAttributes(request,this.getErrorAttributeOptions(request,MediaType.TEXT_HTML)));

@H_301_30@    response.setStatus(status.value());

@H_301_30@    //到那个页面作为错误页面；包含页面地址和页面内容

@H_301_30@    ModelAndView modelAndView = this.resolveErrorView(request,response,status,model);

@H_301_30@    return modelAndView != null ? modelAndView : new ModelAndView("error",model);

@H_301_30@}

@H_301_30@ 

@H_301_30@#产生json数据，其他客户端来到这个方法处理

@H_301_30@@RequestMapping

@H_301_30@public ResponseEntity<Map<String,Object>> error(HttpServletRequest request) {

@H_301_30@    HttpStatus status = this.getStatus(request);

@H_301_30@    if (status == HttpStatus.NO_CONTENT) {

@H_301_30@        return new ResponseEntity(status);

@H_301_30@    } else {

@H_301_30@        Map<String,Object> body = this.getErrorAttributes(request,MediaType.ALL));

@H_301_30@        return new ResponseEntity(body,status);

@H_301_30@    }

@H_301_30@}
@H_301_30@ 

3].ErrorMvcAutoConfiguration.ErrorPageCustomizer

@H_301_30@ 

@H_301_30@#系统出现错误后到error请求进行处理

@H_301_30@#web.xml注册的错误页面规则

@H_301_30@public class ErrorProperties {

@H_301_30@    @Value("${error.path:/error}")

@H_301_30@    private String path = "/error";
@H_301_30@ 

4].DefaultErrorViewResolverConfiguration

@H_301_30@ 

@H_301_30@@Override

@H_301_30@public ModelAndView resolveErrorView(HttpServletRequest request,HttpStatus status,

@H_301_30@Map<String,Object> model) {

@H_301_30@ModelAndView modelAndView = resolve(String.valueOf(status),model);

@H_301_30@if (modelAndView == null && SERIES_VIEWS.containsKey(status.series())) {

@H_301_30@modelAndView = resolve(SERIES_VIEWS.get(status.series()),model);

@H_301_30@}

@H_301_30@return modelAndView;

@H_301_30@}

@H_301_30@ 

@H_301_30@private ModelAndView resolve(String viewName,Map<String,Object> model) {

@H_301_30@        //默认SpringBoot可以去找到一个页面？  error/404

@H_301_30@String errorViewName = "error/" + viewName;

@H_301_30@        

@H_301_30@        //模板引擎可以解析这个页面地址就用模板引擎解析

@H_301_30@TemplateAvailabilityProvider provider = this.templateAvailabilityProviders

@H_301_30@.getProvider(errorViewName,this.applicationContext);

@H_301_30@if (provider != null) {

@H_301_30@            //模板引擎可用的情况下返回到errorViewName指定的视图地址

@H_301_30@return new ModelAndView(errorViewName,model);

@H_301_30@}

@H_301_30@        //模板引擎不可用，就在静态资源文件夹下找errorViewName对应的页面   error/404.html

@H_301_30@return resolveResource(errorViewName,model);

@H_301_30@}

[3].步骤

系统出现4xx或者5xx的错误；ErrorPageCustomizer就会生效（定制错误的响应规则）；来到/error请求；被BasicErrorController处理；

1].响应页面

  页面是由DefaultErrorViewResolver解析得到的

@H_301_30@protected ModelAndView resolveErrorView(HttpServletRequest request,

@H_301_30@      HttpServletResponse response,Object> model) {

@H_301_30@    //所有的ErrorViewResolver得到ModelAndView

@H_301_30@   for (ErrorViewResolver resolver : this.errorViewResolvers) {

@H_301_30@      ModelAndView modelAndView = resolver.resolveErrorView(request,model);

@H_301_30@      if (modelAndView != null) {

@H_301_30@         return modelAndView;

@H_301_30@      }

@H_301_30@   }

@H_301_30@   return null;

@H_301_30@}

(2).定制错误响应

[1].如何定制错误页面

1].模板引擎存在

  @H_871_403@有模板引擎的情况下；error/状态码；将错误页面命名为  错误状态码.html 放在模板引擎文件夹里面的 error文件夹下

@H_301_30@ 

  @H_871_403@我们可以使用4xx和5xx作为错误页面的文件名来匹配这种类型的所有错误，精确优先（优先寻找精确的状态码.html）；

  @H_871_403@页面能获取的信息

@H_301_30@ 

 @H_301_30@ 

timestamp

时间戳

status

状态码

error

错误提示

exception

异常对象

message

异常消息

errors

JSR303数据校验的错误
@H_301_30@ 

2].模板引擎不存在

@H_301_30@  模板引擎找不到这个错误页面,静态资源文件夹下找；

@H_301_30@ 

3].其它

@H_301_30@  @H_871_403@以上都没有错误页面，就是默认来到SpringBoot默认的错误提示页面；

[2].如何定制错误json数据

1].自定义异常处理&返回定制json数据

8.配置嵌入式Servlet容器

  SpringBoot默认使用Tomcat作为嵌入式的Servlet容器

@H_301_30@ 

(1).定制|修改Servlet容器配置

[1].修改server相关配置(ServerProperties)  

@H_301_30@server.port=8081

@H_301_30@server.context-path=/crud

@H_301_30@server.tomcat.uri-encoding=UTF-8

@H_301_30@ 

@H_301_30@//通用的Servlet容器设置

@H_301_30@server.xxx

@H_301_30@//Tomcat的设置

@H_301_30@server.tomcat.xxx
@H_301_30@ 

[2].WebServerFactoryCustomizer

  编写WebServerFactoryCustomizer：嵌入式Servlet容器定制器；修改Servlet容器的配置

@H_301_30@//spring1.0支持 EmbeddedServletContainerCustomizer

@H_301_30@//spring2.0支持 webServerFactoryCustomizer

@H_301_30@//参考文档：https://blog.csdn.net/Stitch__/article/details/88751497

@H_301_30@@Bean

@H_301_30@public WebServerFactoryCustomizer webServerFactoryCustomizer(){

@H_301_30@ 

@H_301_30@    return new WebServerFactoryCustomizer <ConfigurableWebServerFactory>() {

@H_301_30@ 

@H_301_30@        //定制嵌入式的servlet容器相关规则

@H_301_30@        @Override

@H_301_30@        public void customize(ConfigurableWebServerFactory factory) {

@H_301_30@            factory.setPort(8088);

@H_301_30@        }

@H_301_30@    };

@H_301_30@}
@H_301_30@ 

(2).注册Servlet三大组件(Servlet、Filter、Listener)

@H_301_30@  注册三大组件用以下方式：ServletRegistrationBean、FilterRegistrationBean、ServletListenerRegistrationBean

[1].ServletRegistrationBean

@H_301_30@@Bean

@H_301_30@public FilterRegistrationBean myFilter(){

@H_301_30@    FilterRegistrationBean registrationBean = new FilterRegistrationBean();

@H_301_30@    registrationBean.setFilter(new MyFilter());

@H_301_30@    registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));

@H_301_30@    return registrationBean;

@H_301_30@}

[2].FilterRegistrationBean

@H_301_30@@Bean

@H_301_30@public FilterRegistrationBean myFilter(){

@H_301_30@    FilterRegistrationBean registrationBean = new FilterRegistrationBean();

@H_301_30@    registrationBean.setFilter(new MyFilter());

@H_301_30@    registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));

@H_301_30@    return registrationBean;

@H_301_30@}

[3].ServletListenerRegistrationBean

@H_301_30@@Bean

@H_301_30@public ServletListenerRegistrationBean myListener(){

@H_301_30@    ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean(new MyListener());

@H_301_30@    return registrationBean;

@H_301_30@}

  SpringBoot帮我们自动SpringMVC的时候，自动的注册SpringMVC的前端控制器；DIspatcherServlet；

@H_301_30@    @Bean(

@H_301_30@        name = {"dispatcherServletRegistration"}

@H_301_30@    )

@H_301_30@    @ConditionalOnBean(

@H_301_30@        value = {DispatcherServlet.class},

@H_301_30@        name = {"dispatcherServlet"}

@H_301_30@    )

@H_301_30@    public DispatcherServletRegistrationBean dispatcherServletRegistration(DispatcherServlet dispatcherServlet,WebMvcProperties webMvcProperties,ObjectProvider<MultipartConfigElement> multipartConfig) {

@H_301_30@        DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean(dispatcherServlet,webMvcProperties.getServlet().getPath());

@H_301_30@        //默认拦截：/ 所有请求 包括静态资源 但是不拦截jsp  /*会拦截jsp

@H_301_30@        //可以通过server.serverletPath修改SrpingMVC前段控制器默认拦截的请求

@H_301_30@        registration.setName("dispatcherServlet");

@H_301_30@        registration.setLoadOnStartup(webMvcProperties.getServlet().getLoadOnStartup());

@H_301_30@        multipartConfig.ifAvailable(registration::setMultipartConfig);

@H_301_30@        return registration;

@H_301_30@    }

@H_301_30@}

(3).springboot使用其它servlet容器

@H_301_30@ 

 

 [1].tomcat

  Tomcat(默认使用)

@H_301_30@<dependency>

@H_301_30@   <groupId>org.springframework.boot</groupId>

@H_301_30@   <artifactId>spring-boot-starter-web</artifactId>

@H_301_30@   引入web模块默认就是使用嵌入式的Tomcat作为Servlet容器；

@H_301_30@</dependency>

[2].Jetty

  目前只在springboot1.5.10版本上可以成功，spring2.0版本的都有错误

@H_301_30@ 

@H_301_30@<!-- 引入web模块 -->

@H_301_30@<dependency>

@H_301_30@   <groupId>org.springframework.boot</groupId>

@H_301_30@   <artifactId>spring-boot-starter-web</artifactId>

@H_301_30@   <exclusions>

@H_301_30@      <exclusion>

@H_301_30@         <artifactId>spring-boot-starter-tomcat</artifactId>

@H_301_30@         <groupId>org.springframework.boot</groupId>

@H_301_30@      </exclusion>

@H_301_30@   </exclusions>

@H_301_30@</dependency>

@H_301_30@ 

@H_301_30@<!--引入其他的Servlet容器-->

@H_301_30@<dependency>

@H_301_30@   <artifactId>spring-boot-starter-jetty</artifactId>

@H_301_30@   <groupId>org.springframework.boot</groupId>

@H_301_30@</dependency>

[3].Undertow

  Undertow在springBoot1.5.10和SpringBoot2.0都成功运行

@H_301_30@<!-- 引入web模块 -->

@H_301_30@<dependency>

@H_301_30@   <groupId>org.springframework.boot</groupId>

@H_301_30@   <artifactId>spring-boot-starter-web</artifactId>

@H_301_30@   <exclusions>

@H_301_30@      <exclusion>

@H_301_30@         <artifactId>spring-boot-starter-tomcat</artifactId>

@H_301_30@         <groupId>org.springframework.boot</groupId>

@H_301_30@      </exclusion>

@H_301_30@   </exclusions>

@H_301_30@</dependency>

@H_301_30@ 

@H_301_30@<!--引入其他的Servlet容器-->

@H_301_30@<dependency>

@H_301_30@   <artifactId>spring-boot-starter-undertow</artifactId>

@H_301_30@   <groupId>org.springframework.boot</groupId>

@H_301_30@</dependency>

(4).嵌入式Servlet容器自动配置原理

[1].SpringBoot1.5.10版本

  EmbeddedServletContainerAutoConfiguration:嵌入式的Servlet容器自动配置

@H_301_30@@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)

@H_301_30@@Configuration

@H_301_30@@ConditionalOnWebApplication

@H_301_30@@Import(BeanPostProcessorsRegistrar.class)

@H_301_30@//导入BeanPostProcessorsRegistrar：Spring注解版；给容器中导入一些组件

@H_301_30@//导入了EmbeddedServletContainerCustomizerBeanPostProcessor：

@H_301_30@//后置处理器：bean初始化前后（创建完对象，还没赋值赋值）执行初始化工作

@H_301_30@public class EmbeddedServletContainerAutoConfiguration {

@H_301_30@    

@H_301_30@    @Configuration

@H_301_30@@ConditionalOnClass({ Servlet.class,Tomcat.class })//判断当前是否引入了Tomcat依赖；

@H_301_30@@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class,search = SearchStrategy.CURRENT)//判断当前容器没有用户自己定义EmbeddedServletContainerFactory：嵌入式的Servlet容器工厂；作用：创建嵌入式的Servlet容器

@H_301_30@public static class EmbeddedTomcat {

@H_301_30@ 

@H_301_30@@Bean

@H_301_30@public TomcatEmbeddedServletContainerFactory tomcatEmbeddedServletContainerFactory() {

@H_301_30@　　return new TomcatEmbeddedServletContainerFactory();

@H_301_30@   }

@H_301_30@ 

@H_301_30@}

@H_301_30@    

@H_301_30@    /**

@H_301_30@* Nested configuration if Jetty is being used.

@H_301_30@*/

@H_301_30@@Configuration

@H_301_30@@ConditionalOnClass({ Servlet.class,Server.class,Loader.class,

@H_301_30@WebAppContext.class })

@H_301_30@@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class,search = SearchStrategy.CURRENT)

@H_301_30@public static class EmbeddedJetty {

@H_301_30@ 

@H_301_30@@Bean

@H_301_30@public JettyEmbeddedServletContainerFactory jettyEmbeddedServletContainerFactory() {

@H_301_30@    return new JettyEmbeddedServletContainerFactory();

@H_301_30@  }

@H_301_30@ 

@H_301_30@}

@H_301_30@ 

@H_301_30@/**

@H_301_30@* Nested configuration if Undertow is being used.

@H_301_30@*/

@H_301_30@@Configuration

@H_301_30@@ConditionalOnClass({ Servlet.class,Undertow.class,SslClientAuthMode.class })

@H_301_30@@ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class,search = SearchStrategy.CURRENT)

@H_301_30@public static class EmbeddedUndertow {

@H_301_30@ 

@H_301_30@@Bean

@H_301_30@public UndertowEmbeddedServletContainerFactory undertowEmbeddedServletContainerFactory() {

@H_301_30@    return new UndertowEmbeddedServletContainerFactory();

@H_301_30@  }

@H_301_30@ 

@H_301_30@}

1].EmbeddedServletContainerFactory

  EmbeddedServletContainerFactory:嵌入式Servlet容器工厂

@H_301_30@ 

@H_301_30@public interface EmbeddedServletContainerFactory {

@H_301_30@ 

@H_301_30@   //获取嵌入式的Servlet容器

@H_301_30@   EmbeddedServletContainer getEmbeddedServletContainer(

@H_301_30@         ServletContextInitializer... initializers);

@H_301_30@ 

@H_301_30@}

2].EmbeddedServletContainer

  EmbeddedServletContainer:嵌入式的Servlet容器

@H_301_30@ 

3].TomcatEmbeddedServletContainerFactory  

@H_301_30@@Override

@H_301_30@public EmbeddedServletContainer getEmbeddedServletContainer(

@H_301_30@      ServletContextInitializer... initializers) {

@H_301_30@    //创建一个Tomcat

@H_301_30@   Tomcat tomcat = new Tomcat();

@H_301_30@    

@H_301_30@    //配置Tomcat的基本环节

@H_301_30@   File baseDir = (this.baseDirectory != null ? this.baseDirectory

@H_301_30@         : createTempDir("tomcat"));

@H_301_30@   tomcat.setBaseDir(baseDir.getAbsolutePath());

@H_301_30@   Connector connector = new Connector(this.protocol);

@H_301_30@   tomcat.getService().addConnector(connector);

@H_301_30@   customizeConnector(connector);

@H_301_30@   tomcat.setConnector(connector);

@H_301_30@   tomcat.getHost().setAutoDeploy(false);

@H_301_30@   configureEngine(tomcat.getEngine());

@H_301_30@   for (Connector additionalConnector : this.additionalTomcatConnectors) {

@H_301_30@      tomcat.getService().addConnector(additionalConnector);

@H_301_30@   }

@H_301_30@   prepareContext(tomcat.getHost(),initializers);

@H_301_30@    

@H_301_30@    //将配置好的Tomcat传入进去，返回一个EmbeddedServletContainer；并且启动Tomcat服务器

@H_301_30@   return getTomcatEmbeddedServletContainer(tomcat);

@H_301_30@}

4].嵌入式容器配置修改

  @H_871_403@对嵌入式容器的配置修改是需要一下支持生效

@H_301_30@ServerProperties、EmbeddedServletContainerCustomizer

5]修改原理

  EmbeddedServletContainerCustomizerBeanPostProcessor

  @H_871_403@容器中导入了EmbeddedServletContainerCustomizerBeanPostProcessor

@H_301_30@//初始化之前

@H_301_30@@Override

@H_301_30@public Object postProcessBeforeInitialization(Object bean,String beanName)

@H_301_30@      throws BeansException {

@H_301_30@    //如果当前初始化的是一个ConfigurableEmbeddedServletContainer类型的组件

@H_301_30@   if (bean instanceof ConfigurableEmbeddedServletContainer) {

@H_301_30@       //

@H_301_30@      postProcessBeforeInitialization((ConfigurableEmbeddedServletContainer) bean);

@H_301_30@   }

@H_301_30@   return bean;

@H_301_30@}

@H_301_30@ 

@H_301_30@private void postProcessBeforeInitialization(

@H_301_30@ConfigurableEmbeddedServletContainer bean) {

@H_301_30@    //获取所有的定制器，调用每一个定制器的customize方法来给Servlet容器进行属性赋值；

@H_301_30@    for (EmbeddedServletContainerCustomizer customizer : getCustomizers()) {

@H_301_30@        customizer.customize(bean);

@H_301_30@    }

@H_301_30@}

@H_301_30@ 

@H_301_30@private Collection<EmbeddedServletContainerCustomizer> getCustomizers() {

@H_301_30@    if (this.customizers == null) {

@H_301_30@        // Look up does not include the parent context

@H_301_30@        this.customizers = new ArrayList<EmbeddedServletContainerCustomizer>(

@H_301_30@            this.beanfactory

@H_301_30@            //从容器中获取所有这葛类型的组件：EmbeddedServletContainerCustomizer

@H_301_30@            //定制Servlet容器，给容器中可以添加一个EmbeddedServletContainerCustomizer类型的组件

@H_301_30@            .getBeansOfType(EmbeddedServletContainerCustomizer.class,

@H_301_30@                            false,false)

@H_301_30@            .values());

@H_301_30@        Collections.sort(this.customizers,AnnotationAwareOrderComparator.INSTANCE);

@H_301_30@        this.customizers = Collections.unmodifiableList(this.customizers);

@H_301_30@    }

@H_301_30@    return this.customizers;

@H_301_30@}

@H_301_30@ 

@H_301_30@ServerProperties也是定制器

6].步骤

1).SpringBoot根据导入的依赖情况，给容器中添加相应的

EmbeddedServletContainerFactory【TomcatEmbeddedServletContainerFactory】

 

2).容器中某个组件要创建对象就会惊动后置处理器

EmbeddedServletContainerCustomizerBeanPostProcessor；只要是嵌入式的Servlet容器工厂，后置处理器就工作；

 

3).后置处理器，从容器中获取所有的EmbeddedServletContainerCustomizer，调用定制器的定制方法

[2].SpringBoot2.0版本

(5).嵌入式Servlet容器启动原理

问题：

①.何时创建嵌入式的Servlet容器工厂

②.何时获取嵌入式的Servlet容器并启动Tomcat

[1].获取嵌入式的Servlet容器工厂

1].SpringBoot应用启动运行run方法

 

2].refreshContext

  refreshContext(context);

  SpringBoot刷新IOC容器【创建IOC容器对象，并初始化容器，创建容器中的每一个组件】；

  @H_871_403@如果是web应用创建AnnotationConfigEmbeddedWebApplicationContext，否则：AnnotationConfigApplicationContext

3].refresh

@H_301_30@  refresh(context);

@H_301_30@  refresh刷新刚才创建好的ioc容器；

@H_301_30@public void refresh() throws BeansException,IllegalStateException {

@H_301_30@   synchronized (this.startupShutdownMonitor) {

@H_301_30@      // Prepare this context for refreshing.

@H_301_30@      prepareRefresh();

@H_301_30@ 

@H_301_30@      // Tell the subclass to refresh the internal bean factory.

@H_301_30@      ConfigurableListablebeanfactory beanfactory = obtainFreshbeanfactory();

@H_301_30@ 

@H_301_30@      // Prepare the bean factory for use in this context.

@H_301_30@      preparebeanfactory(beanfactory);

@H_301_30@ 

@H_301_30@      try {

@H_301_30@         // Allows post-processing of the bean factory in context subclasses.

@H_301_30@         postProcessbeanfactory(beanfactory);

@H_301_30@ 

@H_301_30@         // Invoke factory processors registered as beans in the context.

@H_301_30@         invokebeanfactoryPostProcessors(beanfactory);

@H_301_30@ 

@H_301_30@         // Register bean processors that intercept bean creation.

@H_301_30@         registerBeanPostProcessors(beanfactory);

@H_301_30@ 

@H_301_30@         // Initialize message source for this context.

@H_301_30@         initMessageSource();

@H_301_30@ 

@H_301_30@         // Initialize event multicaster for this context.

@H_301_30@         initApplicationEventMulticaster();

@H_301_30@ 

@H_301_30@         // Initialize other special beans in specific context subclasses.

@H_301_30@         onRefresh();

@H_301_30@ 

@H_301_30@         // Check for listener beans and register them.

@H_301_30@         registerListeners();

@H_301_30@ 

@H_301_30@         // Instantiate all remaining (non-lazy-init) singletons.

@H_301_30@         finishbeanfactoryInitialization(beanfactory);

@H_301_30@ 

@H_301_30@         // Last step: publish corresponding event.

@H_301_30@         finishRefresh();

@H_301_30@      }

@H_301_30@ 

@H_301_30@      catch (BeansException ex) {

@H_301_30@         if (logger.isWarnEnabled()) {

@H_301_30@            logger.warn("Exception encountered during context initialization - " +

@H_301_30@                  "cancelling refresh attempt: " + ex);

@H_301_30@         }

@H_301_30@ 

@H_301_30@         // Destroy already created singletons to avoid dangling resources.

@H_301_30@         destroyBeans();

@H_301_30@ 

@H_301_30@         // Reset 'active' flag.

@H_301_30@         cancelRefresh(ex);

@H_301_30@ 

@H_301_30@         // Propagate exception to caller.

@H_301_30@         throw ex;

@H_301_30@      }

@H_301_30@ 

@H_301_30@      finally {

@H_301_30@         // Reset common introspection caches in Spring's core,since we

@H_301_30@         // might not ever need Metadata for singleton beans anymore...

@H_301_30@         resetCommonCaches();

@H_301_30@      }

@H_301_30@   }

@H_301_30@}

4].onRefresh

  onRefresh()web的ioc容器重写了onRefresh方法

5].createEmbeddedServletContainer

  webioc容器会创建嵌入式的Servlet容器；

  createEmbeddedServletContainer();

@H_301_30@ 

6].获取嵌入式的Servlet容器工厂

@H_301_30@  EmbeddedServletContainerFactory containerFactory = getEmbeddedServletContainerFactory();

  @H_871_403@从ioc容器中获取EmbeddedServletContainerFactory 组件；TomcatEmbeddedServletContainerFactory创建对象，后置处理器一看是这个对象，就获取所有的定制器来先定制Servlet容器的相关配置；

7].使用容器工厂获取嵌入式的Servlet容器

@H_301_30@this.embeddedServletContainer = containerFactory.getEmbeddedServletContainer(getSelfInitializer());

8].嵌入式的Servlet容器创建对象并启动Servlet容器

  @H_871_403@先启动嵌入式的Servlet容器，再将ioc容器中剩下没有创建出的对象获取出来

  IOC容器启动创建嵌入式的Servlet容器

9.外置Servlet容器

@H_301_30@  @H_871_403@嵌入式Servlet容器：应用打成可执行的jar

@H_301_30@  @H_871_403@嵌入式Servlet容器优点：简单、便携

@H_301_30@  @H_871_403@嵌入式Servlet容器缺点：默认不支持JSP、优化定制比较复杂(使用定制器[ServerProperties、自定义EmbeddedServletContainerCustomizer[，自己编写嵌入式Servlet容器的创建工厂[EmbeddedServletContainerFactory[);

@H_301_30@  @H_871_403@外置式Servlet容器：外面安装Tomcat---应用war包的方式打包；

(1).步骤

[1].创建war项目

@H_301_30@  @H_871_403@利用idea创建好目录结构

[2].修改pom文件

  将嵌入式的Tomcat指定为provided

@H_301_30@<dependency>

@H_301_30@   <groupId>org.springframework.boot</groupId>

@H_301_30@   <artifactId>spring-boot-starter-tomcat</artifactId>

@H_301_30@   <scope>provided</scope>

@H_301_30@</dependency>

[3].SpringBootServletInitializer

  编写一个SpringBootServletInitializer的子类，并调用configure方法

@H_301_30@public class ServletInitializer extends SpringBootServletInitializer {

@H_301_30@ 

@H_301_30@   @Override

@H_301_30@   protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {

@H_301_30@       //传入SpringBoot应用的主程序

@H_301_30@      return application.sources(SpringBoot04WebJspApplication.class);

@H_301_30@   }

@H_301_30@ 

@H_301_30@}

[4].启动服务器

(2).原理

  jar包:执行SpringBoot主类main方法,启动ioc容器,创建嵌入式Servlet容器；

@H_301_30@  war包:启动服务器,服务器启动SpringBoot应用[SpringBootServletInitializer],启动ioc容器;

@H_301_30@ 

[1].规则

1].服务器启动（web应用启动）会创建当前web应用里面每一个jar包里面ServletContainerInitializer实例

 

2].ServletContainerInitializer的实现放在jar包的Meta-INF/services文件夹下，有一个名为javax.servlet.ServletContainerInitializer的文件，内容就是ServletContainerInitializer的实现类的全类名

 

3].使用@HandlesTypes，在应用启动的时候加载需要的类；

[2].流程

1].启动Tomcat

2].org\springframework\spring-web\4.3.14.RELEASE\spring-web-4.3.14.RELEASE.jar!\Meta-INF\services\javax.servlet.ServletContainerInitializer：

  Spring的web模块里面有这个文件：

org.springframework.web.SpringServletContainerInitializer

3].SpringServletContainerInitializer

将@HandlesTypes(WebApplicationInitializer.class)标注的所有这个类型的类都传入到onStartup方法的Set<Class<?>>；为这些WebApplicationInitializer类型的类创建实例；

4].每一个WebApplicationInitializer都调用自己的onStartup；

@H_301_30@

5].相当于我们的SpringBootServletInitializer的类会被创建对象，并执行onStartup方法

@H_301_30@ 

6].SpringBootServletInitializer实例执行onStartup的时候会createRootApplicationContext；创建容器

@H_301_30@protected WebApplicationContext createRootApplicationContext(

@H_301_30@      ServletContext servletContext) {

@H_301_30@    //1、创建SpringApplicationBuilder

@H_301_30@   SpringApplicationBuilder builder = createSpringApplicationBuilder();

@H_301_30@   StandardServletEnvironment environment = new StandardServletEnvironment();

@H_301_30@   environment.initPropertySources(servletContext,null);

@H_301_30@   builder.environment(environment);

@H_301_30@   builder.main(getClass());

@H_301_30@   ApplicationContext parent = getExistingRootWebApplicationContext(servletContext);

@H_301_30@   if (parent != null) {

@H_301_30@      this.logger.info("Root context already created (using as parent).");

@H_301_30@      servletContext.setAttribute(

@H_301_30@            WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE,null);

@H_301_30@      builder.initializers(new ParentContextApplicationContextInitializer(parent));

@H_301_30@   }

@H_301_30@   builder.initializers(

@H_301_30@         new ServletContextApplicationContextInitializer(servletContext));

@H_301_30@   builder.contextClass(AnnotationConfigEmbeddedWebApplicationContext.class);

@H_301_30@    

@H_301_30@    //调用configure方法，子类重写了这个方法，将SpringBoot的主程序类传入了进来

@H_301_30@   builder = configure(builder);

@H_301_30@    

@H_301_30@    //使用builder创建一个Spring应用

@H_301_30@   SpringApplication application = builder.build();

@H_301_30@   if (application.getSources().isEmpty() && AnnotationUtils

@H_301_30@         .findAnnotation(getClass(),Configuration.class) != null) {

@H_301_30@      application.getSources().add(getClass());

@H_301_30@   }

@H_301_30@   Assert.state(!application.getSources().isEmpty(),

@H_301_30@         "No SpringApplication sources have been defined. Either override the "

@H_301_30@               + "configure method or add an @Configuration annotation");

@H_301_30@   // Ensure error pages are registered

@H_301_30@   if (this.registerErrorPageFilter) {

@H_301_30@      application.getSources().add(ErrorPageFilterConfiguration.class);

@H_301_30@   }

@H_301_30@    //启动Spring应用

@H_301_30@   return run(application);

@H_301_30@}

7].Spring的应用就启动并且创建IOC容器

@H_301_30@public ConfigurableApplicationContext run(String... args) {

@H_301_30@   StopWatch stopWatch = new StopWatch();

@H_301_30@   stopWatch.start();

@H_301_30@   ConfigurableApplicationContext context = null;

@H_301_30@   FailureAnalyzers analyzers = null;

@H_301_30@   configureHeadlessProperty();

@H_301_30@   SpringApplicationRunListeners listeners = getRunListeners(args);

@H_301_30@   listeners.starting();

@H_301_30@   try {

@H_301_30@      ApplicationArguments applicationArguments = new DefaultApplicationArguments(

@H_301_30@            args);

@H_301_30@      ConfigurableEnvironment environment = prepareEnvironment(listeners,

@H_301_30@            applicationArguments);

@H_301_30@      Banner printedBanner = printBanner(environment);

@H_301_30@      context = createApplicationContext();

@H_301_30@      analyzers = new FailureAnalyzers(context);

@H_301_30@      prepareContext(context,environment,listeners,applicationArguments,

@H_301_30@            printedBanner);

@H_301_30@       

@H_301_30@       //刷新IOC容器

@H_301_30@      refreshContext(context);

@H_301_30@      afterRefresh(context,applicationArguments);

@H_301_30@      listeners.finished(context,null);

@H_301_30@      stopWatch.stop();

@H_301_30@      if (this.logStartupInfo) {

@H_301_30@         new StartupInfoLogger(this.mainApplicationClass)

@H_301_30@               .logStarted(getApplicationLog(),stopWatch);

@H_301_30@      }

@H_301_30@      return context;

@H_301_30@   }

@H_301_30@   catch (Throwable ex) {

@H_301_30@      handleRunFailure(context,analyzers,ex);

@H_301_30@      throw new IllegalStateException(ex);

@H_301_30@   }

@H_301_30@}

@H_871_403@重要：启动Servlet容器，再启动SpringBoot应用

参考文档

http://www.webjars.org/

https://www.thymeleaf.org/

https://docs.spring.io/spring-boot/docs/1.5.9.RELEASE/reference/htmlsingle/#howto-use-thymeleaf-3

https://github.com/thymeleaf/thymeleaf/releases

https://github.com/ultraq/thymeleaf-layout-dialect/releases

https://www.thymeleaf.org/documentation.html

https://docs.spring.io/spring-boot/docs/1.5.10.RELEASE/reference/htmlsingle/#boot-features-developing-web-applications

 

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