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JAVA 重复提交
FormServlet
package servlet;import java.io.IOException;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 util.TokenProcessor;/** * Servlet implementation class FormServlet */public class FormServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String token = TokenProcessor.getInstance().makeToken(); request.getSession().setAttribute("token", token); request.getRequestDispatcher("/form.jsp").forward(request, response); } }
form.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>form表单</title></head><body> <form action="${pageContext.request.contextPath}/DoFormServlet" method="post"> <input type="hidden" name="token" value="http://www.mamicode.com/${token}" /> 用户名：<input type="text" name="username"><input type="submit" value="http://www.mamicode.com/提交"> </form></body></html>
提交DoFormServlet
package servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class DoFormServlet extends HttpServlet { private static final long serialVersionUID = 1L; public DoFormServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { boolean b = isRepeatSubmit(request); if(b){ System.out.println("请不要重复提交"); return; } request.getSession().removeAttribute("token");//移除session中的token System.out.println("处理用户提交请求！！"); } private boolean isRepeatSubmit(HttpServletRequest request){ String client_token = request.getParameter("token"); if(client_token == null){ return true; } String server_token = (String) request.getSession().getAttribute("token"); if(server_token == null){ return true; } if(!client_token.equals(server_token)){ return true; } return false; }}
JAVA 重复提交
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