我刚刚学习Servlets并尝试实现基本的Servlet。我收到这样的错误
HTTP状态500 –内部服务器错误
实例化servlet类时出现消息错误
我试图通过点击this链接来解决此问题，但没有解决。 以下是我的项目结构
我的index.html文件的内容
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="welcome">Click to call Servlet</a>
</body>
</html>
我的web.xml文件的内容
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>final</display-name>
<servlet>
<servlet-name>sample</servlet-name>
<servlet-class>Test</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>sample</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>
</web-app>
我的Test班
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Test extends HttpServlet {
private String mymsg;
private static final long serialVersionUID = 102831973239L;
public void init() throws ServletException {
mymsg = "Hello World!";
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
// Setting up the content type of webpage
response.setContentType("text/html");
// Writing message to the web page
PrintWriter out = response.getWriter();
out.println("<h1>" + mymsg + "</h1>");
}
}
我对这些东西还很陌生，这些是我的tomcat控制台上的错误消息
Nov 06,2019 11:46:37 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet [sample] as unavailable
Nov 06,2019 11:46:37 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet [sample]
java.lang.ClassnotFoundException: Test
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1360)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1182)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:546)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:527)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1044)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:763)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:134)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractaccessLogValve.invoke(AbstractaccessLogValve.java:678)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)