struts2 token 防止表单重复提交

1、jsp页面输入框，提交按钮

 1 <%@ page language="java" contentType="text/html" pageEncoding="utf-8"%>
 2 <%@ taglib uri="/struts-tags" prefix="s" %>
 3 <!DOCTYPE html>
 4 <html>
 5     <head>
 6         <title>Insert title here</title>
 7     </head>
 8     <body>
 9         <s:form action="User_login" namespace="/login">
10             <!---token标签--->
11             <s:token></s:token>
12 <!--         <!---用于显示action的错误，因为设置的是拦截到后再次返回此页，所以设置了这个标签--> 
13 <!--         <s:actionerror/> -->
14             
15             <s:textfield name="username" label="用户名"></s:textfield>
16             <s:submit label="提交"></s:submit>
17         </s:form>
18     </body>
19 </html>

2、struts.xml

动作类成功执行后通过转发的方式跳转到success.jsp页面。

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
 3 <struts>
 4      <constant name="struts.i18n.encoding" value="utf-8"/>
 5      <package name="default" namespace="" extends="struts-default">
 6         <global-results>
 7           <result name="error">/error.jsp</result>
 8         </global-results>
 9       </package>
10   
11   <package name="users" extends="default" namespace="/login">
12     <action name="User_login" class="cn.gs.ly.UserAction" method="login">
13 
14       <!--使用默认拦截器-->
15       <interceptor-ref name="defaultStack"></interceptor-ref>
16       <!--使用token拦截器-->
17 <!--  <interceptor-ref name="token"></interceptor-ref>  -->
18       <!--使用tokenSession拦截器-->
19       <interceptor-ref name="tokenSession"></interceptor-ref> 
20       <!--拦截到后的输出界面-->
21       <result name="invalid.token">/message.jsp</result>
22       
23       <result name="success">/User_login_success.jsp</result>
24       <result name="failure">/index.jsp</result>
25     </action>
26   </package>
27 
28 </struts>

3、UserAction类

每次用户提交表单后，输出表单提交的提示。

 1 package cn.gs.ly;
 2 
 3 import com.opensymphony.xwork2.ActionSupport;
 4 
 5 public class UserAction extends ActionSupport {
 6     private String username;
 7     private String token;
 8     
 9     public String getUsername(){
10         return username;    
11     }
12     public void setUsername(String username){
13         this.username=username;
14     }            
15     public String getToken() {
16         return token;
17     }
18     public void setToken(String token) {
19         this.token = token;
20     }
21     
22     
23     public String login(){
24         System.out.println(username+"表单已提交");
25         return SUCCESS;
26     }
27     
28     
29 }

登陆成功跳 success.jsp

 1 <%@ page language="java" contentType="text/html" pageEncoding="utf-8"%>
 2 <!DOCTYPE html>
 3 <html>
 4     <head>
 5         <title>Insert title here</title>
 6     </head>
 7     <body>
 8         <h2>登陆成功，这是登陆成功页面</h2>
 9     </body>
10 </html>

重复提交跳 message.jsp

<%@ page language="java" contentType="text/html" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html>
<html>
    <head>
        <title>Insert title here</title>
    </head>
    <body>         
        <h3>请勿重复提交</h3>
        <!---用于显示action的错误，因为设置的是拦截到后再次返回此页，所以设置了这个标签-->
        <s:actionerror/>
    </body>
</html>

登陆失败跳 error.jsp

 1 <%@ page language="java" import="java.util.*" isErrorPage="true"%>
 2 <%@ page contentType="text/html; charset=utf-8" %>
 3 <%@ taglib uri="/struts-tags" prefix="s"%>
 4 <%
 5     String path = request.getContextPath();
 6 %>
 7 
 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 9 <html>
10   <head>  
11     <title>page</title>
12   </head>
13   <body>
14     <center>
15       <h1>出错了！</h1>
16       <hr>
17                         异常信息：<s:property value="exception"/><br>
18         <a href="<%=path%>/index.jsp">返回首页</a>    
19     </center>
20   </body>
21 </html>