在struts2中，我们可以利用struts2自带的token拦截器轻松实现防止表单重复提交功能！
1. 在相应的action配置中增加：
<interceptor-ref name="token"></interceptor-ref>
<result name="invalid.token">/error.jsp</result>
2. 增加error.jsp文件,代码如下：
<h1>禁止重复提交</h1>
3. 在所提交的表单上增加:<s:token></s:token>标记。
<form action="firstAction">
<input name="uname" value="zhangsan"><br>
<s:token></s:token>
<input type="submit" value="提交">
</form>
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="crm" namespace="/" extends="struts-default" >
<interceptors>
<interceptor name="myInter" class="com.huawei.interceptor.MyInterceptor" />
<interceptor-stack name="myStack">
<interceptor-ref name="defaultStack" />
<!-- <interceptor-ref name="myInter" /> -->
<interceptor-ref name="token" />
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="myStack" />
<!-- 全局result -->
<global-results>
<result name="success">/ok.jsp</result>
</global-results>
</package>
<package name="default" namespace="/" extends="crm">
<action name="firstAction" class="com.huawei.s2.action.FirstAction" >
<result name="invalid.token" >/error.jsp</result>
</action>
</package>
</struts>
Action:
package com.huawei.s2.action;
public class FirstAction {
private String uname;
public String execute(){
System.out.println(uname+"========FirstAction=======");
return "success";
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
}
interceptor:
package com.huawei.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
/**
* 要么实现 Interceptor 接口 要么 继承类
* @author Administrator
*
*/
public class MyInterceptor extends AbstractInterceptor{
@Override
public String intercept(ActionInvocation invocation) throws Exception {
System.out.println(invocation.getAction());
System.out.println(invocation.getInvocationContext());
System.out.println(invocation.getProxy().getActionName());
System.out.println(invocation.getProxy().getMethod());
System.out.println(invocation.getInvocationContext().getParameters());
System.out.println("action执行前");
invocation.invoke();
System.out.println("action执行后");
return null;
}
}
jsp:
1.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>This is my JSP page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<form action="firstAction">
<input name="uname" value="zhangsan"><br>
<s:token></s:token>
<input type="submit" value="提交">
</form>
</body>
</html>
ok.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>This is my JSP page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<h1>提交成功</h1>
</body>
</html>
error.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>This is my JSP page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<h1>禁止重复提交</h1>
</body>
</html>