1.引入以下两个jar包
2.按惯例，先上struts-config.xml，（其中包含了我上一个EL测试的action）
<?xml version="1.0" encoding="ISO-8859-1" ?><!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd"><struts-config> <action-mappings> <action path="/jstlel" type="com.codedestiny.struts.JSTLELAction" scope="request"> <forward name="success" path="/jstlel.jsp"></forward> </action> <action path="/jstlcore" type="com.codedestiny.struts.JSTLCoreAction" scope="request"> <forward name="success" path="/jstlcore.jsp"></forward> </action> </action-mappings> <message-resources parameter="MessageResources" /></struts-config>
3.接下来JSTLCoreAction.java：
package com.codedestiny.struts;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;
public class JSTLCoreAction extends Action ...{
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception ...{ request.setAttribute("hello", "Hello World"); request.setAttribute("cd", "<font color='red' size='6'>成都欢迎大家</font>"); request.setAttribute("v1", 10); request.setAttribute("v2", 20); List<User> users = new ArrayList<User>(); Group relatedGroup = new Group(); relatedGroup.setName("Xihua Univercity"); for(int i=1; i<10; i++) ...{ User u = new User(); u.setUsername("user" + i); u.setAge(20 + i); u.setRelatedGroup(relatedGroup); users.add(u);
} Map<String, Integer> hashMap = new HashMap<String, Integer>(); hashMap.put("key1", 1); hashMap.put("key2", 2); hashMap.put("key3", 3); hashMap.put("key4", 4); request.setAttribute("map", hashMap); request.setAttribute("users", users); request.setAttribute("tokenstr", "1,2,3,4,5"); return mapping.findForward("success"); }
}
4.展示页面jstlcore.jsp：
<%...@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%...@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> </head> <body> <h1>JSTL核心库标签测试</h1> <hr> <li>测试c:out</li><br> hello(default) : <c:out value="${hello}"></c:out><br> b(default value) : <c:out value="${b}" default="no value"></c:out><br> b(default value) : <c:out value="${b}">no value</c:out><br> cd(default) : <c:out value="${cd}"></c:out><br> cd(escapeXml=true) : <c:out value="${cd}" escapeXml="true"></c:out><br> cd(escapeXml=false) : <c:out value="${cd}" escapeXml="false"></c:out><br> <hr> <li>测试c:set, c:remove</li><br> <c:set var="temp" value="123"></c:set> temp : ${ temp } <br> <c:remove var="temp"/> temp : ${ temp } <br> <hr> <li>测试条件控制标签c:if</li><br> <c:if test="${v1 < v2}" var="boolean"> v1 < v2 ? ${boolean} <br> </c:if> <hr> <li>测试条件控制标签c:choose, c:when, c:otherwise</li><br> <c:choose> <c:when test="${v1 < v2}"> v1 < v2 <br> </c:when> <c:otherwise> v1 > v2 <br> </c:otherwise> </c:choose> <hr> <li>测试循环访问标签c:forEach</li><br> <table border="1"> <tr> <td>姓名</td><td>年龄</td><td>所属组</td> </tr> <c:choose> <c:when test="${empty users}"> <tr><td colspan="3">没有相关数据</td></tr> </c:when> <c:otherwise> <c:forEach items="${users}" var="user"> <tr> <td>${user.username}</td> <td>${user.age}</td> <td>${user.relatedGroup.name}</td> </tr> </c:forEach> </c:otherwise> </c:choose> </table> <hr> <li>测试循环访问标签c:forEach中varStatus的用法</li><br> <table border="1"> <tr> <td>姓名</td><td>年龄</td><td>所属组</td> </tr> <c:choose> <c:when test="${empty users}"> <tr><td colspan="3">没有相关数据</td></tr> </c:when> <c:otherwise> <c:forEach items="${users}" var="user" varStatus="vs"> <c:choose> <c:when test="${vs.count % 2 == 0}"> <tr bgcolor="red"> <td>${user.username}</td> <td>${user.age}</td> <td>${user.relatedGroup.name}</td> </tr> </c:when> <c:otherwise> <tr> <td>${user.username}</td> <td>${user.age}</td> <td>${user.relatedGroup.name}</td> <tr> </c:otherwise> </c:choose> </c:forEach> </c:otherwise> </c:choose> </table> <hr> <li>测试循环访问标签c:forEach中begin, end, step的用法</li><br> <table border="1"> <tr> <td>姓名</td><td>年龄</td><td>所属组</td> </tr> <c:choose> <c:when test="${empty users}"> <tr><td colspan="3">没有相关数据</td></tr> </c:when> <c:otherwise> <c:forEach items="${users}" var="user" varStatus="vs" begin="1" end="8" step="2"> <c:choose> <c:when test="${vs.count % 2 == 0}"> <tr bgcolor="red"> <td>${user.username}</td> <td>${user.age}</td> <td>${user.relatedGroup.name}</td> </tr> </c:when> <c:otherwise> <tr> <td>${user.username}</td> <td>${user.age}</td> <td>${user.relatedGroup.name}</td> <tr> </c:otherwise> </c:choose> </c:forEach> </c:otherwise> </c:choose> </table> <hr> <li>测试循环访问标签c:forEach,输出一个map</li><br> <c:forEach items="${map}" var="v"> <c:out value="${v.key}"/> = <c:out value="${v.value}"/><br> </c:forEach> <hr> <li>测试循环访问标签c:forEach,普通标签</li><br> <c:forEach begin="0" end="5"> aaa<br> </c:forEach> <hr> <li>测试循环控制标签c:fortokens</li><br> <c:forTokens items="${tokenstr}" delims="," var="v"> <c:out value="${v}"></c:out> </c:forTokens> </body></html>
5.最后来几张测试结果的截图：
