防止表单重复提交

防止表单重复提交

控制器

package com.kaishengit.web;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.UUID;

@WebServlet("/pay")
public class PayServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //产生Token值
        String token = UUID.randomUUID().toString();
        //放入表单
        req.setAttribute("token",token);
        //放入session
        HttpSession session = req.getSession();
        session.setAttribute("token",token);

        req.getRequestDispatcher("/WEB-INF/views/pay.jsp").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接受值
        String token = req.getParameter("token");
        String money = req.getParameter("money");

        //验证Token
        HttpSession session = req.getSession();
        String sessionToken = (String)session.getAttribute("token");
        if(sessionToken != null && sessionToken.equals(token)) {
            System.out.println("成功支付" + money + "元");
            session.removeAttribute("token");

            req.getRequestDispatcher("/WEB-INF/views/paysuccess.jsp").forward(req,resp);
        } else {
            req.getRequestDispatcher("/WEB-INF/views/payerror.jsp").forward(req,resp);
        }
    }
}

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>



    
    



    
    
    支付

---

<%@ page contentType="text/html;charset=UTF-8" language="java" %>



    
    


    
请不要重复提交