Question

单击表单上的“提交”按钮时出现404错误。获取URL映射http://localhost:8080/HelloWorld/HelloServlet的错误（请求的资源不可用。）。我也尝试了这个引用，Servlet returns "HTTP Status 404 The requested resource (/servlet) is not available"但这似乎也不起作用。

1，index，html

   <!DOCTYPE html>
   <html>
   <head>
   <meta charset="ISO-8859-1">
   <title>Insert title here</title>
   </head>
   <body>
      <form action="HelloServlet">
        <input type="submit" value="HIT">
      </form>
   </body>
   </html>

2。 HelloServlet

        package com.example.aman;

        import java.io.IOException;
        import javax.servlet.ServletConfig;
        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 HelloServlet
        */
        @WebServlet("/HelloServlet")
        public class HelloServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;

        /**
        * Default constructor. 
        */
        public HelloServlet() {
        // TODO Auto-generated constructor stub
        }

        /**
         * @see Servlet#init(ServletConfig)
        */
        public void init(ServletConfig config) throws ServletException {
        // TODO Auto-generated method stub
        System.out.println("DIVESH");
        }

        /**
         * @see HttpServlet#doGet(HttpServletRequest request, 
        HttpServletResponse response)
        */
        protected void doGet(HttpServletRequest request, HttpServletResponse 
        response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: 
        ").append(request.getContextPath());
        response.getWriter().println("DIVESH");
        }

        /**
         * @see HttpServlet#doPost(HttpServletRequest request, 
         HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

第3。的web.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" 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>HelloWorld</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>

Answer 1

http://localhost:8080/HelloWorld/HelloServlet

直接告诉我问题是什么。您正尝试从同一文件夹目录中访问servlet。如果您对relative URLS

不小心，会发生这种情况

在表单中，将URL映射更改为：

   <form action="/HelloServlet">
        <input type="submit" value="HIT">
      </form>

如果这不起作用，请执行以下操作：

   <form action="../HelloServlet">
        <input type="submit" value="HIT">
      </form>

在路径中添加 / 会使其成为absolute。

添加 ../ 会使其转到当前目录的父目录。

希望有所帮助。

提交表单时获取请求时出现Servlet 404错误

1 个答案: