Struts2---标签
各种标签:property, set, bean, include, fielderror, if, iterator, ui
<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />
<title>Struts-Tags学习</title>
</head>
<body>
<ol>
<li>property: <s:property value="username"/> </li>
<li>property 取值为字符串: <s:property value="'username'"/> </li>
<li>property 设定默认值: <s:property value="admin" default="管理员"/> </li>
<li>property 设定HTML: <s:property value="'<hr/>'" escape="false"/> </li>
<hr />
<li>set 设定adminName值（默认为request 和 ActionContext）: <s:set var="adminName" value="username" /></li>
<li>set 从request取值: <s:property value="#request.adminName" /></li>
<li>set 从ActionContext取值: <s:property value="#adminName" /></li>
<%--<li>set 设定范围: <s:set name="adminPassword" value="password" scope="page"/></li>
<li>set 从相应范围取值: <%=pageContext.getAttribute("adminPassword") %></li>
--%>
<li>set 设定var，范围为ActionContext: <s:set var="adminPassword" value="password" scope="session"/></li>
<li>set 使用#取值: <s:property value="#adminPassword"/> </li>
<li>set 从相应范围取值: <s:property value="#session.adminPassword"/> </li>
<hr />
<%--<li>push:<s:set name="myDog" value="new com.bjsxt.struts2.ognl.Dog('oudy')"></s:set></li>
<li>
push:<s:push value="#myDog">
<s:property value="name"/>
</s:push>
</li>
<li>push: <s:property value="name"/></li>
--%>
<hr />
<li>bean 定义bean,并使用param来设定新的属性值:
<s:bean name="com.bjsxt.struts2.tags.Dog" >
<s:param name="name" value="'pp'"></s:param>
<s:property value="name"/>
</s:bean>
</li>
<li>bean 查看debug情况:
<s:bean name="com.bjsxt.struts2.tags.Dog" var="myDog">
<s:param name="name" value="'oudy'"></s:param>
</s:bean>
拿出值：
<s:property value="#myDog.name"/>
</li>
<hr />
<li>include _include1.html 包含静态英文文件
<s:include value="/_include1.html"></s:include>
</li>
<li>include _include2.html 包含静态中文文件
<s:include value="/_include2.html"></s:include>
</li>
<li>include _include1.html 包含静态英文文件，说明%用法
<s:set var="incPage" value="%{'/_include1.html'}" />
<s:include value="%{#incPage}"></s:include>
</li>
<hr />
<li>if elseif else:
age = <s:property value="#parameters.age[0]" /> <br />
<s:set var="age" value="#parameters.age[0]" />
<s:if test="#age < 0">wrong age!</s:if>
<s:elseif test="#parameters.age[0] < 20">too young!</s:elseif>
<s:else>yeah!</s:else><br />
<s:if test="#parameters.aaa == null">null</s:if>
</li>
<hr />
<li>遍历集合：<br />
<s:iterator value="{1, 2, 3}" >
<s:property/> |
</s:iterator>
</li>
<li>自定义变量：<br />
<s:iterator value="{'aaa', 'bbb', 'ccc'}" var="x">
<s:property value="#x.toUpperCase()"/> |
</s:iterator>
</li>
<li>使用status:<br />
<s:iterator value="{'aaa', 'bbb', 'ccc'}" status="status">
<s:property/> |
遍历过的元素总数：<s:property value="#status.count"/> |
遍历过的元素索引：<s:property value="#status.index"/> |
当前是偶数？：<s:property value="#status.even"/> |
当前是奇数？：<s:property value="#status.odd"/> |
是第一个元素吗？：<s:property value="#status.first"/> |
是最后一个元素吗？：<s:property value="#status.last"/>
<br />
</s:iterator>
</li>
<li>
<s:iterator value="#{1:'a', 2:'b', 3:'c'}" >
<s:property value="key"/> | <s:property value="value"/> <br />
</s:iterator>
</li>
<li>
<s:iterator value="#{1:'a', 2:'b', 3:'c'}" var="x">
<s:property value="#x.key"/> | <s:property value="#x.value"/> <br />
</s:iterator>
</li>
<li>
<s:fielderror fieldName="fielderror.test" theme="simple"></s:fielderror>
</li>
</ol>
</body>
</html>
