struts2中property标签属性介绍

最新推荐文章于 2019-10-19 11:51:04 发布

转载最新推荐文章于 2019-10-19 11:51:04 发布 · 1.4k 阅读

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本文介绍Struts2框架中property标签的基本用法及示例。property标签可用于获取Action中的属性值、显示字符串、设置默认值以及解析HTML字符串。

property标签用于取得value的属性值。
1.显示Action中的属性值：<s:property value="属性名" />
2.显示字符串，使用单引号：<s:property value="'字符串'" />
3.显示默认值，Action中找不到指定的属性时，显示default属性的值：<s:property value="属性名" default="默认值" />
4.解析HTML字符串，escape默认值为true，直接输出字符串，escape设为false时，解析HTML字符串：<s:property value="'<font color=\"red\">Red</font>'" escape="false" />

实例：

web.xml:

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:

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. 

27. <constant name="struts.devMode" value="true" />

28. <constant name="struts.i18n.encoding" value="GBK" />

29. <package name="user" namespace="/" extends="struts-default">

30. <action name="user" class="cn.edu.ahau.mgc.struts2.action.UserAction">

31. <result>/addSuccess.jsp</result>

32. </action>

33. </package>

34.</struts>

UserAction.java:

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.

10. public String execute() {

11. return SUCCESS;

12. }

13.

14. public String getUserName() {

15. return this.userName;

16. }

17.

18. public void setUserName(String userName) {

19. this.userName = userName;

20. }

21.

22.}

index.jsp:

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>Property</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. <a href="user?userName=magci">user?userName=magci</a><br />

25. </body>

26.</html>

addSuccess.jsp:

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>Property</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. 显示Action中的属性值： <s:property value="userName" /><br />

27. 显示字符串： <s:property value="'userName'" /><br />

28. Action中找不到指定的属性时，显示默认值： <s:property value="admin" default="默认值" /><br />

29. 解析HTML字符串： <s:property value="'<font color=\"red\">Red</font>'" escape="false" /><br />

30. <s:debug></s:debug>

31. </body>

32.</html>