<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
pageContext.setAttribute("user", "admin");
%>
<!-- c:out标签 -->
el表达式：${user }<br>
c:out标签:<c:out value="${user }"></c:out><br>
<!-- c:catch -->
<c:catch var="e">
${pageContext.name }
</c:catch>
${e.message }<br>
<!-- c:if -->
<c:if test="${user== 'admin' }" var="flag" >
欢迎登陆<br>
${flag }
</c:if>
<!-- c:choose -->
<%
pageContext.setAttribute("hobby", "basketball");
%>
<c:choose>
<c:when test="${hobby=='basketball' }">
我喜欢打篮球
</c:when>
<c:when test="${hobby == 'football' }">
我喜欢踢足球
</c:when>
<c:otherwise>
我啥都不喜欢
</c:otherwise>
</c:choose>
<!-- c:foreach -->
<br>---------------------遍历数组---------------------<br>
<%
Object[] city ={"北京","天津","上海","深圳"};
pageContext.setAttribute("city", city);
%>
<c:forEach items="${city }" var="c">
${c }<br>
</c:forEach>
<br>---------------------遍历list---------------------<br>
<%
List<String> s = new ArrayList<>();
s.add("路飞");
s.add("索隆");
s.add("娜美");
pageContext.setAttribute("s", s);
%>
<c:forEach items="${s }" var="s">
${s }<br>
</c:forEach>
<br>---------------------遍历set---------------------<br>
<%
Set<String> set = new HashSet<>();
set.add("路飞");
set.add("索隆");
pageContext.setAttribute("set", set);
%>
<c:forEach items="${set }" var="set">
${set }<br>
</c:forEach>
<br>---------------------遍历map---------------------<br>
<%
Map<String,String> map = new HashMap<>();
map.put("船长", "路飞");
map.put("战斗员", "索隆");
map.put("航海员", "娜美");
map.put("狙击手", "乌索普");
map.put("山治", "厨师");
map.put("医生", "乔巴");
map.put("历史学者", "罗宾");
map.put("造船工", "弗兰奇");
map.put("音乐家", "布鲁克");
map.put("舵手", "甚平");
pageContext.setAttribute("map", map);
%>
<c:forEach items="${map }" var="m">
${m.key }:${m.value }
<br>
</c:forEach>
<br>------------------指定遍历的起始索引-----------------<br>
<%
Object[] country = {"中国","美国","德国","英国"};
pageContext.setAttribute("country", country);
%>
<c:forEach items="${country }" var="count" begin="1" end="3" step="2">
${count }
</c:forEach>
<!-- varStatus -->
<%
Map<Integer,String> string = new HashMap<>();
string.put(1,"luffy");
string.put(2,"zoro");
string.put(3,"name");
pageContext.setAttribute("string", string);
%>
<table border="1">
<tr >
<td>序号</td>
<td>学号</td>
<td>姓名</td>
</tr>
<c:forEach items="${string }" var="s" varStatus="obj">
<tr style="background-color:${obj.index % 2 ==0? 'orange' :'red'}">
<td>${obj.count }</td>
<td>${s.key }</td>
<td>${s.value }</td>
</tr>
</c:forEach>
</table>
</body>
</html>
