Struts的Iterate标签-优快云博客

本文链接：https://blog.youkuaiyun.com/brsuo/article/details/83406288

对Struts中的BeanWrite标签做下测试（具体过程可以参见尚学堂的视频）

前提：好像必须要导入struts的国际化标签，有待验证。

第一步：添加IterateTestAction类

package com.bjsxt.struts;
/**
 * 测试Iterate
 */
public class IterateTestAction extends Action {

	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		Group group = new Group();
		group.setName("尚学堂");
		
		List userList = new ArrayList();
		for (int i=0; i<10; i++) {
			User user = new User();
			user.setUsername("user_" + i);
			user.setAge(18+i);
			user.setGroup(group);
			userList.add(user);
		}
		
		request.setAttribute("userlist", userList);
		
		return mapping.findForward("success");
	}

}

第二步：添加测试的jsp页面（iterate.jsp）

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean"%>    
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic"%>   
<%@ page import="java.util.*" %>
<%@ page import="com.bjsxt.struts.*" %>    
<!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=GB18030">
<title>测试Iterate</title>
</head>
<body>
	<h1>测试Iterate</h1>
	<hr>
	<li>jsp脚本</li><br>
	<table border="1">
		<tr>
			<td>姓名</td>
			<td>年龄</td>
			<td>所属组</td>
		</tr>
		<%
			List userList = (List)request.getAttribute("userlist");
			if (userList == null || userList.size() == 0) {
		%>
			<tr>
				<td colspan="3">没有符合条件的数据!</td>
			</tr>
		<%
			}else {
				for (Iterator iter=userList.iterator(); iter.hasNext(); ) {
					User user = (User)iter.next();
		%>
			<tr>
				<td><%=user.getUsername() %></td>
				<td><%=user.getAge() %></td>
				<td><%=user.getGroup().getName() %></td>
			</tr>
		<%
				}
			}
		%>
	</table>
	
	<p>
	<li>标签</li><br>
	<table border="1">
		<tr>
			<td>姓名</td>
			<td>年龄</td>
			<td>所属组</td>
		</tr>
		<logic:empty name="userlist">
			<tr>
				<td colspan="3">没有符合条件的数据!</td>
			</tr>
		</logic:empty>
		<logic:notEmpty name="userlist">
			<logic:iterate id="u" name="userlist">
				<tr>
					<td>
						<bean:write name="u" property="username"/>
					</td>
					<td>
						<bean:write name="u" property="age"/>
					</td>
					<td>
						<bean:write name="u" property="group.name"/>
					</td>
				</tr>
			</logic:iterate>
		</logic:notEmpty>
	</table>	
</body>
</html>

第三步：显示出来的结果如下：