J2EE中HTTP method GET/Post is not supported by this URL

原因：

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

2，父类HttpServlet的doGet或doPost等方法覆盖了你重写的doGet或doPost等方法；

不管是1或2，父类HttpServlet的doGet或doPost等方法的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。

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解决方法：

1，子类重写doGet或doPost等方法；

2，在你扩展的Servlert中重写doGet或doPost等方法来处理请求和响应时不要调用父类HttpServlet的doGet或doPost等方法，即去掉super.doGet(request, response)和super.doPost(request, response);

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值得注意的是

转发到另一个action并不会改变转发方式，也就是说，我在这个action里面的doPost方法转发给另一个action，另一个action必须在它的doPost方法里面接收

package com.xy.action;

import java.io.IOException;
import java.text.SimpleDateFormat;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.xy.dao.ITopicDao;
import com.xy.dao.impl.TopicDaoImpl;
import com.xy.entity.Topic;

public class PostAction extends HttpServlet
{

<wbr>protected void <strong>doPost</strong>(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException<br><wbr>{<br><wbr><wbr>ITopicDao itd = new TopicDaoImpl();</wbr></wbr></wbr></wbr>

<wbr><wbr>String title = request.getParameter("title");<br><wbr><wbr>String content = request.getParameter("content");<br><wbr><wbr>String pt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new java.util.Date());<br><wbr><wbr>String mt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new java.util.Date());<br><wbr><wbr>int bid = Integer.valueOf(request.getParameter("boardId"));<br><wbr><wbr>int uid = Integer.valueOf(request.getParameter("uId"));</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

<wbr><wbr>Topic t = new Topic();<br><wbr><wbr>t.setTitle(title);<br><wbr><wbr>t.setBoardId(bid);<br><wbr><wbr>t.setContent(content);<br><wbr><wbr>t.setPublishTime(pt);<br><wbr><wbr>t.setmodifyTime(mt);<br><wbr><wbr>t.setUid(uid);<br><wbr><wbr>itd.addTopic(t);</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

<wbr><wbr>RequestDispatcher dis = request.getRequestDispatcher("ToListAction");<br><wbr><wbr>dis.forward(request, response);<br><wbr>}</wbr></wbr></wbr></wbr></wbr>

}

也就是说:相应在ToListAction这个action里面，必须重写doPost方法。