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struts分发action下用Token解决重复提交问题

StrutsApacheBeanJSPJava 
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一、写跳转用的发帖链接页面，点击后，对应的action中会对该次提交加上一个Token令牌 
<%@ page language="java" pageEncoding="utf-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<html:html lang="true">
  <head>
    <html:base />
    <title>forum.jsp</title>
  </head>
  <body>
  <html:link action="/publish.do?status=forTopic">我要发帖</html:link>
  </body>
</html:html>

二、Action中的forTopic方法给该提交加令牌Token 

package com.test.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import com.test.struts.form.PublishForm;


public class PublishAction extends DispatchAction {
	
	//这个方法给publishTopic-1.jsp的链接加上令牌
	public ActionForward forTopic(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		PublishForm publishForm = (PublishForm) form;// TODO Auto-generated method stub
		System.out.println("forTopic...");
		this.saveToken(request);
		return mapping.findForward("publishTopic");
		
	}
	//用于检查令牌是否过时，并做出相应处理
	public ActionForward toTopic(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		PublishForm publishForm = (PublishForm) form;// TODO Auto-generated method stub
		if(isTokenValid(request)){ //如果两个Token相匹配的话
			System.out.println("toTopic...");
			String title = request.getParameter("title");
			String content = request.getParameter("content");
			request.setAttribute("title", title);
			request.setAttribute("content", content);
			this.resetToken(request);
			return mapping.findForward("publishshow");		
		}else{
			System.out.println("for resubmit error...");
			return mapping.findForward("error");
		}		
	}
}

三、发帖内容填写页面publishTopic.jsp 
<%@ page language="java" pageEncoding="utf-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>publishTopic.jsp</title>

  </head>
  
  <body>
     <html:form action="/publish.do?status=toTopic" method="post">
    	<input type="text" name="title"/><br>
    	<input type="text" name="content"/><br>
    	<input type="submit" value="发表"/>
    	<input type="reset" value="重置"/>
    </html:form> 
    <h1>good!!</h1>
  </body>
</html:html>

四、提交后成功时显示的页面publishshow.jsp 
<%@ page language="java" pageEncoding="utf-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>publishshow.jsp</title>

  </head>
  
  <body>
  <h1>发表后的文章信息：</h1>
  <input type="text" value="<%=request.getAttribute("title") %>"/><br>
  <input type="text" value="<%=request.getAttribute("content") %>"/>
  </body>
</html:html>

五、后退浏览器重复提交后显示的页面error.jsp 
<%@ page language="java" pageEncoding="utf-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    <title>error.jsp</title>
  </head>
  <body>
    <h1>重复提交了！！！</h1>
  </body>
</html:html>

六、struts-config.xml中对应的配置 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
  <data-sources />
  <form-beans >
    <form-bean name="publishForm" type="com.test.struts.form.PublishForm" />
    <form-bean name="tokenActionForm" type="com.test.struts.form.TokenActionForm" />
    </form-beans>
  <global-exceptions />
  <global-forwards />
  <action-mappings >
    <action
      attribute="publishForm"
      input="/error.jsp"
      name="publishForm"
      parameter="status"
      path="/publish"
      scope="request"
      type="com.test.struts.action.PublishAction">
      <forward name="publishTopic" path="/publishTopic.jsp"></forward>
      <forward name="error" path="/error.jsp"></forward>
      <forward name="publishshow" path="/publishshow.jsp"></forward>
    </action>
    <action
    attribute="tokenActionForm"
    parameter="status"
    input="/error.jsp"
     path="/tokenAction" 
     scope="request"
     name="tokenActionForm"
     type="com.test.struts.action.TokenActionAction">
     <forward name="strutsToken1" path="/strutsToken1.jsp"></forward>
    </action>
  </action-mappings>
  <message-resources parameter="com.test.struts.ApplicationResources" />
</struts-config>
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