Struts ognl使用示例

古城微笑少年丶 2022-05-09 07:10 192阅读 0赞

**一、Struts2中ognl标签是对el表达式的一个加强，具有更多的功能，比如自动回显功能**

**二、常用示例**

1.控制标签和数据标签

<%@page import="java.util.*"%>
 <%@page import="com.struts.web.pojo.Student"%>
 <%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
 <%@ taglib uri="/struts-tags" prefix="s" %>
 
 <%
 	
 	request.setAttribute("num", 5);
 	request.setAttribute("list", Arrays.asList("A","B","C","D","F","G"));
 	
 	List<Student> listData = new ArrayList<Student>();
 	Student stu = new Student();
 	stu.setName("tim");
 	stu.setId(1);
 	listData.add(stu);
 	Student stu2 = new Student();
 	stu2.setName("herry");
 	stu2.setId(2);
 	listData.add(stu2);
 	request.setAttribute("listData",listData);
 	
 	request.setAttribute("info", " 我想去看看 ");
 %>
 <s:debug></s:debug>
 
 <s:if test="#request.num > 5">
 	大于5
 </s:if>
 <s:elseif test="#request.num < 5">
 	小于5
 </s:elseif>
 <s:else>
 	等于5
 </s:else>
 
  
 <s:iterator begin="1" end="10" var="num" >
 	<s:property value="num" />
 </s:iterator>
 
 <s:iterator value="#request.list" var="item">
 	<s:property value="item" />
 </s:iterator> 
 
 
 <s:iterator value="#request.listData" var="stu" >
 	<s:property value="#stu.id" />
 	<s:property value="#stu.name" />
 </s:iterator> 
 
 <s:iterator value="#request.listData" >
 	<s:property value="id" />
 	<s:property value="name" />
 </s:iterator>
 
 
 
 <s:property value="#request.inf" default="世界那么大" />
 <s:property value="#request.info" default="世界那么大" escapeHtml="false" />
 
 
 <a href="/down/download?fileName=a.rar" >三国演义</a> 
 <s:a namespace="/down" action="download" >
 	<s:param name="fileName" value='%{"a.rar"}%' ></s:param>
 	三国演义
 </s:a>
 <s:url namespace="/down" action="download" value="myurl" >
 	<s:param name="fileName" value='%{"a.rar"}%' ></s:param>
 </s:url> 
 <s:a href="#myurl" >西游记</s:a>

2.表单标签

![70][]

[70]: /images/20220509/b0b4fb8b3a16459eacebebe7aa989e63.png