HTTP method POST is not supported by this URL解决方案

刚才在做一个简单的 Session 案例——实现用户登录的 Demo，将 Login.html，LoginServlet.java，IndexServlet.java 以及 web.xml 等代码都写好后。打开登录页面，输入信息后，跳转到如下错误页面

HTTP method POST is not supported by this URL 解决方案

HTTP method POST is not supported by this URL

以下是错误时候的代码

（1）form.html 代码如下

这里是 post 方式提交的

（2）LoginServlet.java 代码如下

package com.liuyanzhao;
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;
/*
* @author LiuYanzhao
*/
public class LoginServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//防止乱码
resp.setContentType(“text/html;charset=utf-8”);
String username = req.getParameter(“username”);
String password = req.getParameter(“password”);
PrintWriter out = resp.getWriter();
//假设正确的账号是 admin,密码是 123456
if(“admin”.equals(username)&&“123456”.equals(password)) {
User user = new User();
user.setUsername(username);
user.setPassword(password);
req.getSession().setAttribute(“user”, user);
resp.sendRedirect(“/ServletTest/IndexServlet”);
} else {
out.print(“用户名和密码错误，登录失败！”);
}
}
}