Struts2防表单重复提交
在Web应用中，经常会碰到连续多次点击“提交”按钮或者刷新页面导致form重复提交的情况，如何有效避免这种情况的发生呢？这里我们重点讨论采用Struts2的token机制来处理。闲话说到这里，直接上代码。
struts.xml配置文件：
<?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>
<!-- 默认的视图主题 -->
<constant name="struts.ui.theme" value="simple" />
<!-- struts2在防止表单重复提交的拦截中有2个，分别是：token，tokenSession。tokenSession继承token而来。
通常情况下，使用tokenSession客户端感觉会比较友好。 -->
<!-- 如果重复提交，会跳转到error.jsp页面 -->
<package name="person" namespace="/test" extends="struts-default">
<action name="token" class="com.ljq.action.PersonAction">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="token" />
<!-- 如果重复提交，跳转到error.jsp页面 -->
<result name="invalid.token">/WEB-INF/page/error.jsp</result>
<result>/WEB-INF/page/message.jsp</result>
</action>
<action name="tokenSession" class="com.ljq.action.PersonAction">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="tokenSession" />
<!-- 如果重复提交，不会跳转到error.jsp页面 -->
<result name="invalid.token">/WEB-INF/page/error.jsp</result>
<result>/WEB-INF/page/message.jsp</result>
</action>
</package>
</struts>PersonAction类：
public class PersonAction {
private String name;
@SuppressWarnings("unchecked")
public String execute() {
List ls = new ArrayList();
ls.add(name);
for (int i = 0; i < ls.size(); i++) {
System.out.println(ls.get(i));
}
return "success";
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}index.jsp表单页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>防止表单重复提交</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<!-- 防止表单重复提交，记得在form表单里填上<s:token></s:token> -->
<s:form action="token" namespace="/test" method="post">
姓名:<s:textfield name="name"/><s:token></s:token>
<input type="submit" value="发送"/>
</s:form>
</body>
</html>message.jsp消息页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<s:property value="name"/><br/>
<%=new Date() %>
</body>
</html>error.jsp错误提示页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
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%>">
<title>My JSP 'error.jsp' starting 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>
您已经提交了表单，请不要重复提交。
</body>
</html>
