关于servlet调用doGet或者doPost以后报405的问题

package com.sparkhuu.servlets;

import java.io.IOException;

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

public class ServletDemo3 extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 2L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
//      super.doGet(req, resp);
resp.getWriter().write("hello servlet");
System.out.println("********ServletDemo3*********");
}

}