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Struts1防止表单重复提交

2015-06-13 18:32 513 查看

package org.zln.struts.action;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Created by sherry on 000020/5/20 20:37.
*/
public class RegUserUI extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
/*注意，请求页面一定要通过这个Action跳转过去*/
this.saveToken(request);
return mapping.findForward("SUCCESS");
}
}

<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<html>
<head>
<title>注册用户</title>
</head>
<body>

<hr/>
<html:link action="/local?language=zh">中文</html:link><br/>
<html:link action="/local?language=en">英文</html:link><br/>
<hr/>
<html:errors property="doubleSubmit" header="" footer="" prefix="" suffix=""/>
<!-- 注意：只有使用html:form生成的表单，才会从session中获取Token -->
<html:form action="/regUser" method="post">
<table>
<caption>注册</caption>
<tr>
<td>用户名</td>
<td><html:text property="regUser.username"/><html:errors property="username" header="" footer="" prefix="" suffix=""/> </td>
</tr>
<tr>
<td>密码</td>
<td>
<%-- value="" 是为了不回显密码--%>
<html:password property="regUser.password" value=""/> <html:errors property="password" header="" footer="" prefix="" suffix=""/>
</td>
</tr>
<tr>
<td>密码确认</td>
<td>
<html:password property="password2" value=""/><html:errors property="password2" header="" footer="" prefix="" suffix=""/>
</td>
</tr>
<tr>
<td>身高</td>
<td>
<html:text property="regUser.height"/>
</td>
</tr>
<tr>
<td colspan="2" align="right">
<html:submit titleKey="info.submit"><bean:message bundle="message" key="info.submit"/></html:submit>
<html:checkbox property="autoLogin">两周内自动登录?</html:checkbox>
<html:cancel>取消</html:cancel>
</td>
</tr>
</table>
</html:form>
<hr/>

</body>
</html>

package org.zln.struts.action;

import org.apache.struts.action.*;
import org.zln.struts.form.RegUserForm;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Created by sherry on 000020/5/20 20:37.
*/
public class RegUser extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
ActionMessages errors = new ActionMessages();
/*进行所有操作之前，先判断表单是否重复提交*/
if (!isTokenValid(request,true)){//假如Token无效  true表示校验完后将Token从session中清除
errors.add("doubleSubmit",new ActionMessage("表单重复提交",false));
this.saveErrors(request,errors);
return mapping.getInputForward();
}
RegUserForm regUserForm = (RegUserForm) form;
System.out.println("username:"+regUserForm.getRegUser().getUsername()+"\nautoLogin:"+regUserForm.isAutoLogin());
request.setAttribute("username",regUserForm.getRegUser().getUsername());
/*业务逻辑校验*/
if (!"zln".equals(regUserForm.getRegUser().getUsername().trim())){//假设数据库中获取到的用户名是  zln
errors.add("username",new ActionMessage("用户不存在",false));
this.saveErrors(request,errors);//request.setAttribute(Globals.ERROR_KEY, errors);
//return mapping.findForward("FAILURE");
return mapping.getInputForward();
}
return mapping.findForward("SUCCESS");
}
}

/*
因为在打开表单页面之前，会先往session中存放一个Token，
提交请求的时候，会将隐藏域中的Token作为参数一起提交
所谓有效的Token，就是session中的Token与表单提交时候的Token值相同，就被视为是一次请求。并且判断完后会将session中的Token清除
加入用户通过后退再次提交，此时session中的Token已经消失了，所以Token判断就会被视为无效
*/

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