思路
1.添加拦截器,拦截需要防重复提交的请求 2.通过注解@Token来添加token/移除token 3.前端页面表单添加(如果是Ajax请求则需要在请求的json数据中添加token值)
核心源码
拦截器源码实现
/** * com.xxx.interceptor.TokenInterceptor.java * Copyright 2018 Lifangyu, Inc. All rights reserved. */package com.xxx.common.interceptor;import org.apache.log4j.Logger;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.lang.reflect.Method;import java.util.Random;import java.util.UUID;/** * Desc:防重复提交的拦截器 * <p> * Created by lifangyu on 2018/02/27. */public class TokenInterceptor extends HandlerInterceptorAdapter { Logger logger = Logger.getLogger(TokenInterceptor.class); static String splitFlag = "_"; @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { if (handler instanceof HandlerMethod) { HandlerMethod handlerMethod = (HandlerMethod) handler; Method method = handlerMethod.getMethod(); Token annotation = method.getAnnotation(Token.class); if (annotation == null) { return true; } boolean needSaveSession = annotation.add(); if (needSaveSession) { Random random = new Random(); String uuid = UUID.randomUUID().toString().replace(splitFlag, String.valueOf(random.nextInt(100000))); String tokenValue = String.valueOf(System.currentTimeMillis()); request.setAttribute("token", uuid + splitFlag + tokenValue); // session 中 token 的key 每次都是变化的[适应浏览器 打开多个带有token的页面不会有覆盖session的key] request.getSession(true).setAttribute(uuid, tokenValue); } boolean needRemoveSession = annotation.remove(); if (needRemoveSession) { if (isRepeatSubmit(request)) { logger.warn("please don't repeat submit,url:" + request.getServletPath()); return false; } String clinetToken = request.getParameter("token"); if (clinetToken != null && clinetToken.indexOf(splitFlag) > -1) { request.getSession(true).removeAttribute(clinetToken.split("_")[0]); } } return true; } else { return super.preHandle(request, response, handler); } } /** * 判断是否是重复提交 * * @param request * @return */ private boolean isRepeatSubmit(HttpServletRequest request) { String clinetToken = request.getParameter("token"); if (clinetToken == null) { return true; } String uuid = clinetToken.split("_")[0]; String token = clinetToken.split("_")[1]; String serverToken = (String) request.getSession(true).getAttribute(uuid); if (serverToken == null) { return true; } if (!serverToken.equals(token)) { return true; } return false; } }
注解源码
/** * com.xxx.interceptor.Token.java * Copyright 2018 Lifangyu, Inc. All rights reserved. */package com.xxx.common.interceptor;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * Desc:Token 注解 * <p> * Created by lifangyu on 2018/02/27. */@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface Token { /** * 添加token的开关[true:添加;false:不添加,default:false] * * @return */ boolean add() default false; /** * 移除token的开关[true:删除;false:不删除,default:false] * * @return */ boolean remove() default false; }
拦截器的配置
在springMVC的servlet配置文件中配置拦截器
<!-- 拦截器配置 --><mvc:interceptors> <!-- 配置Token拦截器,防止用户重复提交数据 --> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.xxx.interceptor.TokenInterceptor"/> </mvc:interceptor></mvc:interceptors>
使用指南
1.在进入页面的controller方法上添加注解@Token(add=true)
@Token(add = true)@RequestMapping("toXxxHtml")public String toXxxHtml(Model mv) { ...... return "xxx/xxxHtml"; }
2.在页面toXxxHtml.html添加
<form id="xxx_submit_form" class="form-horizontal" action="${ctx}/xxx/addXxx.do" method="post"> ...... <!-- 注:name必须是token --> <input type="hidden" name="token" value="${token!''}"/> ......</form>
3.在防止重复提交的controller方法上添加@Token(remove = true)
@Token(remove = true)@RequestMapping("addXxx")public String addXxx() throws Exception { ...... return "redirect:toXxxHtml.do"; }
原文出处:https://www.cnblogs.com/yclimb/p/9934106.html
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