JSTL标签库的学习笔记 

<%@ 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>

posted @ 2011-10-19 21:58  胖鹅  阅读(241)  评论(1)  编辑  收藏  举报