在 servlet 程序 HTTP 状态 404 - /HelloWorldServlet/ 时出错

Question

My Servlets program

Package com.srccodes.example;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Servlet implementation class Helloworld
 */
@WebServlet("/Helloworld")
public class Helloworld extends HttpServlet {
    private static final long serialVersionUID = 1L;
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Helloworld() {
        super();
        // TODO Auto-generated constructor stub
    }
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter printWriter  = response.getWriter();
        printWriter.println("<h1>Hello World!</h1>");
    }
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }
}

更新：

韦克.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>HelloWorldServlet</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

在Tomcat服务器上运行上述程序时出现错误错误 --> https://i.stack.imgur.com/655Ew.png。如何解决这个问题，请尝试建议我，好的答案会适合

Answer 1

他们在上面提供的代码中没有错。您的 servlet 名称是 'Helloworld'，而您正在尝试的 URL 是

http://localhost:8080/HelloworldServlet

如果你想运行相同的 servlet 试试

http://localhost:8080/HelloworldServlet/Helloworld

同时重新启动服务器并检查 URL。

Answer 2

从 url 中删除 "Servlet"，类似于 http://localhost:8080/Helloworld

Answer 3

这个类是 WAR 应用程序的一部分吗？尝试将 WAR 名称放在端口和 HelloWorld 之间。