我正在试验是否可以在邮递员中调用javassist在运行时创建的控制器文件。创建一个Java类,其类上带有@RestController
批注,方法上带有Postmapping批注。不出所料,它无法从邮递员那里打电话。
我的同事说,这可能是因为注释扫描的时机所致。当启动Spring Boot时,会出现如下所示的日志,其中引用了AnnotationconfigApplicationContext
,因此我尝试将Bean注册到AnnotationconfigApplicationContext
,但结果是相同的。未找到。
因此,首先想知道是否有可能。
2019-11-06 15:22:14.825 DEBUG [external-service,](20008)[main] [o.s.c.a.AnnotationconfigApplicationContext:590] [local] Refreshing org.springframework.context.annotation.AnnotationconfigApplicationContext@72be135f
2019-11-06 15:22:14.837 DEBUG [external-service,](20008)[main] [o.s.b.f.s.DefaultListableBeanFactory:213] [local] Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
这是用于创建带注释的控制器的代码。
public Class ctClassController() throws Exception {
CtClass ctController = this.createCtClass("ctController");
CtMethod ctMethod = CtNewMethod.make("public String test(){ return 'testController';}",ctController);
ClassFile cfile = ctController.getclassFile();
ConstPool constPool = cfile.getconstPool();
AnnotationsAttribute attr = new AnnotationsAttribute(constPool,AnnotationsAttribute.visibletag);
Annotation annotation = new Annotation(RestController.class.getName(),constPool);
attr.addAnnotation(annotation);
annotation = new Annotation(Component.class.getName(),constPool);
attr.addAnnotation(annotation);
ctController.getclassFile().addAttribute(attr);
AnnotationsAttribute attr4Method = new AnnotationsAttribute(constPool,AnnotationsAttribute.visibletag);
annotation = new Annotation(PostMapping.class.getName(),constPool);
annotation.addMemberValue("value",new StringMemberValue("/api/ctController",constPool));
attr4Method.setannotation(annotation);
ctMethod.getMethodInfo().addAttribute(attr4Method);
ctController.addMethod(ctMethod);
ctController.toClass(this.getclass().getclassLoader(),this.getclass().getProtectionDomain());
Class klass = Class.forName("ctController");
return klass;
}
,以下是重新扫描注释的尝试。
Class controllerKlass = vendorDynamicClassConstructor.ctClassController();
Object controllerObj = controllerKlass.getDeclaredConstructor().newInstance();
AbstractApplicationContext abstractContext = new AnnotationconfigApplicationContext();
abstractContext.refresh();
AnnotationconfigApplicationContext context = new AnnotationconfigApplicationContext();
context.register(controllerObj.getclass());
context.refresh();
因此,如果我这样向邮递员打电话,http://localhost:2028/api/ctController 我想查看“ testController”,但是我得到了以下内容。会有其他方法吗?
<Map>
<timestamp>1573026801879</timestamp>
<status>404</status>
<error>Not Found</error>
<message>No message available</message>
<path>/api/ctController</path>
</Map>