Struts数据标签
<%@page import="java.util.Date"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>通用标签</title>
</head>
<body>
<h3 style="color: red;">数据标签</h3>
<h3>set</h3>
<!-- value里面放的是表达式 集合是ognl上下文 -->
<!-- 在ognl上下文的根对象中取result属性值，赋给test1 -->
<s:set var="test1" value="result"></s:set>
${test1 },${requestScope.test1 }
<h3>property</h3>
<!-- 取栈顶 (cal1)-->
<s:property/>,
<!-- 取根对象的最上面(栈顶)的属性 -->
<s:property value="num1"/>,
<!-- 取根对象的cal2对象的num1属性 -->
<s:property value="cal2.num1"/>
<!-- 取非根对象的cal2对象的num1属性值 -->
<s:property value="#request.cal2.num1"/>
<h3>push</h3>
<!-- push就是将你需要的值放到栈顶，便于页面获取值 -->
<s:push value="result">
<s:property/>
</s:push>
<!-- 结束标签 结果又回到了cal1 -->
<s:property/>
<h3>action</h3>
<!-- action标签通常用来请求后台 获取初始化数据 -->
<s:action name="tagAction" namespace="/sy" var="test2"></s:action>
<s:property value="#test2.cal2"/>
<h3>url</h3>
<!-- url标签是为了生成地址所用，便于与a标签区分 -->
<s:url namespace="/sy" action="tagAction" var="test3"></s:url>
<s:property value="#test3"/>
<a href="<s:property value="#test3"/>">xxx</a>
<!-- %{test3}：str会被强制转换成OGNL表达式计算 -->
<s:a href="%{#test3}">aaa</s:a>
<h3>param</h3>
<!-- 两种赋值方式： ognl表达式，字符串 -->
<s:url namespace="/sy" action="tagAction" var="test4">
<s:param name="test5">aaa</s:param>
<s:param name="test6" value="num1"></s:param>
</s:url>
<s:property value="#test4"/>
<h3>date</h3>
<%
request.setAttribute("currentDate", new Date());
request.setAttribute("score", new Integer(70));
request.setAttribute("names", new String[]{"gay","lisi","wangwu"});
%>
<%-- <s:date name="#request.currentDate"/> --%>
<s:date name="#request.currentDate" format="yyyy-mm-dd"/>
<h3>debug</h3>
<s:debug/>
<h3 style="color: red;">控制标签</h3>
<h3>iterator/if/elseif/else</h3>
<!-- 无序打印 -->
<ul>
<s:iterator var="v" value="#request.names">
<li>
<s:property value="#v"/>
</li>
</s:iterator>
</ul>
<s:if test="#request.score>80">A</s:if>
<s:elseif test="#request.score>60">B</s:elseif>
<s:else>C</s:else>
</body>
</html>