struts2通过result传递参数
1.使用redirect类型的result通过URL传递参数，也可以使用${属性名}动态设置参数；
2.在JSP中使用<s:property value="#parameters.属性名"/>显示接收的参数；
3.通过redirect类型的result传递的参数，不能使用<s:property value="属性名"/>显示接收的参数；
因为redirect不通过Action，ValueStack为空，只能从#parameters中取得参数；
实例：
web.xml:
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01.<?xml version="1.0" encoding="UTF-8"?>
02.<web-app version="2.5"
03. xmlns="http://java.sun.com/xml/ns/javaee"
04. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
05. xsi:schemaLocation="http://java.sun.com/xml/ns/javaee ;
06. http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
07. <welcome-file-list>
08. <welcome-file>hello.jsp</welcome-file>
09. </welcome-file-list>
10. <filter>
11. <filter-name>struts2</filter-name>
12. <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
13. </filter>
14. <filter-mapping>
15. <filter-name>struts2</filter-name>
16. <url-pattern>/*</url-pattern>
17. </filter-mapping>
18.</web-app>
struts.xml:
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01.<?xml version="1.0" encoding="UTF-8" ?>
02.<!DOCTYPE struts PUBLIC
03. "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
04. "http://struts.apache.org/dtds/struts-2.0.dtd">
05.
06.<struts>
07. <!--
08. <constant name="struts.enable.DynamicMethodInvocation" value="false" />
09. <constant name="struts.devMode" value="false" />
10.
11. <include file="example.xml"/>
12.
13.
14.
15. <package name="default" namespace="/" extends="struts-default">
16. <default-action-ref name="index" />
17. <action name="index">
18. <result type="redirectAction">
19. <param name="actionName">HelloWorld</param>
20. <param name="namespace">/example</param>
21. </result>
22. </action>
23. </package>
24. -->
25.
26. <!-- Add packages here -->
27. <constant name="struts.devMode" value="true" />
28. <constant name="struts.i18n.encoding" value="GBK"></constant>
29. <package name="user" namespace="/" extends="struts-default">
30. <action name="user" pageEncoding="GB18030"%>
02.<%
03.String path = request.getContextPath();
04.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
05.%>
06.
07.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
08.<html>
09. <head>
10. <base href="<%=basePath%>">
11.
12. <title>ResultParam</title>
13. <meta http-equiv="pragma" content="no-cache">
14. <meta http-equiv="cache-control" content="no-cache">
15. <meta http-equiv="expires" content="0">
16. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17. <meta http-equiv="description" content="This is my page">
18. <!--
19. <link rel="stylesheet" type="text/css" href="styles.css">
20. -->
21. </head>
22.
23. <body>
24. User:<br />
25. <form action="user!add" method="post">
26. UserName: <input type="text" name="userName" />
27. <input type="submit" value="Submit" />
28. </form>
29. </body>
30.</html>
addSuccess.jsp:
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01.<%@ page language="java" pageEncoding="GB18030"%>
02.<%@ taglib uri="/struts-tags" prefix="s" %>
03.<%
04.String path = request.getContextPath();
05.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
06.%>
07.
08.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
09.<html>
10. <head>
11. <base href="<%=basePath%>">
12.
13. <title>Dynamic</title>
14. <meta http-equiv="pragma" content="no-cache">
15. <meta http-equiv="cache-control" content="no-cache">
16. <meta http-equiv="expires" content="0">
17. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18. <meta http-equiv="description" content="This is my page">
19. <!--
20. <link rel="stylesheet" type="text/css" href="styles.css">
21. -->
22. </head>
23.
24. <body>
25. User Add Success! <br />
26. UserName:<s:property value="userName"/><br />
27. UserName:<s:property value="#parameters.userName"/>
28. <s:debug></s:debug>
29. </body>
30.</html>
