HTTP Status 405 -- HTTP method POST is not supported by this URL

package web.filter;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CommentServlet extends HttpServlet{

private static final long serialVersionUID = 1L;

public CommentServlet(){

System.out.println("CommentServlet,constractor...");

}

public void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//super.service(request, response);-----> 这句话一定要屏蔽.

System.out.println("CommentServlet,service begin...");

request.setCharacterEncoding("utf-8");

response.setContentType("text/html;charset=utf-8");

PrintWriter out = response.getWriter();

String content = request.getParameter("content");

out.print("

你的评论是"+content+"

");

System.out.println("CommentServlet,service end...");

}

public void destroy() {

  super.destroy();

  System.out.println("CommentServlet,destroy...");

}

public void init() throws ServletException {

  super.init();

  System.out.println("CommentServlet,init...");

}

}

访问时，一直报错：

type: Status report

message: HTTP method POST is not supported by this URL

description: The specified HTTP method is not allowed for the requested resource (HTTP

method POST is not supported by this URL).

 

经过上网查询，原因如下：

1，继承自HttpServlet的Servlet没有重写对于请求和响应的处理方法：service方法；默认调用父类的service方法；

2，父类HttpServlet的service方法覆盖了你重写的service方法；

     父类HttpServlet的service方法默认实现是返回状态代码为405的HTTP错误表示

     对于指定资源的请求方法不被允许。

 

 

解决方法：

1，子类重写service等方法；

2，在你扩展的Servlert中重写service方法来处理请求和响应时 不要调用父类HttpServlet的

service方法，即去掉super.service(request, response);