<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> <%@ taglib prefix="c" uri="c.tld资源文件中有定义" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'JSTL_test.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <h1>测试jstl核心库</h1> <hr> <li>测试c:out</li> hello(default):<c:out value="${hello}"/><br> hello(el表达式):${hello }<br> hello(如果不存在可以使用默认值huangbiao):<c:out value="${hello}" default="huangbiao"></c:out> hello(如果不存在可以使用默认值huangbiao):<c:out value="${hello}">huangbiao</c:out> <li>测试c:set和c:remove</li> <c:set value="123" var="temp"/> temp:${temp }<br> <c:remove var="temp"/> temp:${temp }<br> <li>测试条件控制标签c:if</li> <c:if test="${v1 lt v2}" var="v"> ` v1 小于 v2<br> v = ${v } </c:if> <c:if test="${empty v3}"> v3为空 </c:if> <c:if test="${not empty v4}"> v4不为空 </c:if> <li>测试条件控制的标签c:choose,c:when,c:otherwise</li> <c:choose> <c:when test="${v1 lt v2}"> v1 小于 v2 </c:when> <c:when test="${v1 eq v2}"> v1 等于 v2 </c:when> <c:otherwise> 不知道 </c:otherwise> </c:choose> <li>测试循环控制标签c:forEach</li> <table> <tr> <td>姓名</td> <td>年龄</td> <td>所属组</td> </tr> <c:choose> <c:when test="${empty userlist}"> <tr> <td>没有符合条件的数据</td> </tr> </c:when> <c:otherwise> <c:forEach item="${userlist}" var="user"> <tr> <td>${user.username }</td> <td><${user.age }/td> <td>${user.group.name }</td> </tr> </c:forEach> </c:otherwise> </c:choose> </table> <li>测试循环控制标签c:forEach,varstatus</li> <table border="1"> <tr> <td>姓名</td> <td>年龄</td> <td>所属组</td> </tr> <c:choose> <c:when test="${empty userlist}"> <tr> <td>没有符合条件的数据</td> </tr> </c:when> <c:otherwise> <c:forEach items="${userlist}" var="user" varStatus="vs"> <c:choose> <c:when test="${vs.count % 2 == 0}"> <tr bgcolor="red"> </c:when> <c:otherwise> <tr> </c:otherwise> <td>${user.username }</td> <td><${user.age }/td> <td>${user.group.name }</td> </tr> </c:choose> </c:forEach> </c:otherwise> </c:choose> </table> <li>测试循环控制标签c:forEach,begin,end,step</li> <table border="1"> <tr> <td>姓名</td> <td>年龄</td> <td>所属组</td> </tr> <c:when test="${empty userlist}"> <tr> <td>没有符合条件的数据</td> </tr> </c:when> <c:otherwise> <c:forEach items="${userlist}" var="user" begin="2" end="8" step="2"> <tr> <td>${user.username }</td> <td><${user.age }/td> <td>${user.group.name }</td> </tr> </c:forEach> </c:otherwise> <li>测试循环控制标签c:forEach,普通循环</li> <c:forEach begin="1" end="10"> a<br> </c:forEach> <li>测试循环控制标签c:forEach,输出map</li> <c:forEach items="${maplist}" var="v"> ${v.key }-----${v.value }<br> </c:forEach> <li>测试c:catch</li> <% try{ Integer.parseInt("dsafd"); }catch(Exception e){ out.println(e.getMessage()); } %> <c:catch var="info"> <% Integer.parseInt("dsafd"); %> </c:catch> ${info }<br> <li>测试c:import</li> 相当于include用法<br> <c:import url="hb.html"/> <c:import url="http://localhoust:8080/struts_login"/> <li>测试c:url 和 c:param</li> <c:url value="http://localhost:8080/drp/user_add.jsp" value="v"> <c:param name="username" value="jack"/> <c:param name="age" value="20"></c:param> </c:url> ${v}<br> <li>重定向c:redirect</li> <c:redirect context="/struts_login" url="/index.jsp"></c:redirect> </body> </html>
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