struts2通过result传递参数 -

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struts2通过result传递参数

Struts JSP Apache XML HTML

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.    
25.
26.    
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" class="cn.edu.ahau.mgc.struts2.action.UserAction">
31.            <result type="redirect">/addSuccess.jsp?userName=${userName}</result>
32.        </action>
33.    </package>
34.</struts>

UserAction.java:
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01.package cn.edu.ahau.mgc.struts2.action;
02.
03.import com.opensymphony.xwork2.ActionSupport;
04.
05.public class UserAction extends ActionSupport {
06.
07.    private String userName;
08.
09.    public String add() {
10.        return SUCCESS;
11.    }
12.
13.    public String getUserName() {
14.        return this.userName;
15.    }
16.
17.    public void setUserName(String userName) {
18.        this.userName = userName;
19.    }
20.
21.}

index.jsp:
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01.<%@ page language="java" 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.    
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.    
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>

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