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  • 【JSTL】--JSTL表达式:c:forEach,varstatus/begin end/循环控制标签--drp215

    jstl_core.jsp

    <%@ page language="java" contentType="text/html; charset=GB18030"
        pageEncoding="GB18030"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
    <%@ page import="com.bjpowrnode.jstl.*" %>
    <%@ page import="java.util.*" %>
    
    <!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>Insert title here</title>
    </head>
    <body>
    	<h3>采用forEach标签,varstatus</h3><br>
    	<table border="1">
    		<tr>
    			<td>用户名称</td>
    			<td>年龄</td>
    			<td>所属组</td>
    			
    		</tr>
    		<c:choose>
    			<c:when test="${empty users}">
    				<tr>
    					<td colspan="3">没有符合条件的数据</td>
    				</tr>
    			</c:when>
    			<c:otherwise>
    				<c:forEach items="${users }" var="user" varStatus="vs">
    					<c:choose>
    						<c:when test="${vs.count mod 2==0 }">
    							<tr bgcolor="red">
    						</c:when>
    						<c:otherwise>
    							<tr>
    						</c:otherwise>
    					</c:choose>
    							<td>${user.username}</td>
    	 						<td>${user.age }</td>
    	 						<td>${user.group.name }</td>
    							<tr>
    					
    				</c:forEach>
    			</c:otherwise>
    		</c:choose>
    	
    	</table>
    	
    	
    	
    	 <h3>采用forEach标签,begin ,end</h3>
    	 <table border="1">
    	 	<tr>
    	 		<td>用户名称</td>
    	 		<td>年龄</td>
    	 		<td>所属组</td>
    	 	</tr>
    	 	<c:choose>
    	 		<c:when test="${empty users }">
    	 			<tr>
    	 				<td colspan="3" >没有符合条件的数据</td>
    	 			</tr>
    	 		</c:when>
    	 		<c:otherwise>
    	 			<c:forEach items="${users}" var="user" begin="2" end="8" step="2">
    	 				<tr>
    	 					<td>${user.username}</td>
    	 					<td>${user.age }</td>
    	 					<td>${user.group.name }</td>
    	 				</tr>
    	 			</c:forEach>
    	 		
    	 		</c:otherwise>
    	 		
    	 	</c:choose>
    	 </table>
    	
    	<li>演示循环控制标签:forEach,输出Map</li><br>
    	<c:forEach items="${map }" var ="entry">
    		${entry.key },${entry.value}<br>
    	</c:forEach>
    	
    	<li>循环控制标签:forTokens</li><br>
    	<c:forTokens items=	"${strTokens}" delims="#" var="v">
    		${v }<br>
    	</c:forTokens>
    	
    </body>
    </html>
    

    JstlCoreServlet

    /**
     * 
     */
    package com.bjpowrnode.jstl;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * @ClassName:JstlCoreServlet
     * @Description:TODO
     * @author wm
     * @date 2016年2月15日上午11:40:32
     */
    public class JstlCoreServlet extends HttpServlet {
    
    	protected void doGet(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    		//普通字符串
    		request.setAttribute("hello","Hello World!");
    		request.setAttribute("welcome", "<font color='red'>欢迎你来到这个世界!</font>");
    		
    		//条件控制标签、
    		request.setAttribute("v1", 10);
    		request.setAttribute("v2", 20);
    		
    		request.setAttribute("userList", new ArrayList());
    		
    		
    		//结构
    		Group group =new Group();
    		group.setName("动力节点drp 603班");
    		
    		List users=new ArrayList();
    		for(int i =0;i<10;i++){
    			User user=new User();
    			user.setUsername("张三_"+i );		
    			user.setAge(23+i);
    			user.setGroup( group);	
    			users.add(user);
    		}
    		
    		request.setAttribute("users", users);
    		
    		//map
    		Map map=new HashMap();
    		map.put("k1", "v1");
    		map.put("k2", "v2");
    		map.put("k3", "v3");
    		map.put("k4", "v4");
    		request.setAttribute("map", map);
    		
    		
    		//forTokens
    		request.setAttribute("strTokens", "1#2#3#4#5");
    		
    		
    		request.getRequestDispatcher("/jstl_core.jsp").forward(request, response);
    	}
    
    
    }
    
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  • 原文地址:https://www.cnblogs.com/wangmei/p/5190986.html
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