<!-- e1 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ 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=UTF-8">
<title>Insert title here
</title>
</head>
<body>
<%
request.setAttribute("attr_request","attr_request值");
session.setAttribute("attr_session","attr_session值");
application.setAttribute("attr_application","attr_application值");
%>
<div>
<div style="color:red;font-size:30px;">c:out标签的使用
</div>
<div style="color:red">可以获取request，session，application的值
</div>
parameter的值(得到不了)：<c:out value="${name}"/><br />
<c:out value="${attr_request}"/>---${attr_request}
<br />
<c:out value="${attr_session}"/>---${attr_session}
<br />
<c:out value="${attr_application}"/>---${attr_application}
<br />
</div>
<hr />
<%
request.setAttribute("same_name","request值");
session.setAttribute("same_name","session值");
application.setAttribute("same_name","application值");
%>
<div>
<div style="color:red">相同名字的：request优先于session,session优先于application
</div>
<c:out value="${same_name}"/><br />
</div>
<hr />
<%
HashMap map = new HashMap();
map.put("name","嵌套值");
request.setAttribute("result",map);
ArrayList list = new ArrayList();
HashMap map1 = new HashMap();
map1.put("name","张三");
list.add(map1);
HashMap map2 = new HashMap();
map2.put("name","李四");
list.add(map2);
request.setAttribute("list",list);
%>
<div>
<div style="color:red">可以嵌套获取值，java也一样
</div>
<c:out value="${result.name}"/> --- ${result.name}
<br />
<c:out value="${list[0].name}"/>--- ${list[0].name}
<br />
<c:out value="${list[1].name}"/>---${list[1].name}
<br />
</div>
</body>
</html>
<!-- e2 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here
</title>
</head>
<body>
<div style="color:red;font-size:30px;">条件判断标签的使用(c:if,c:shoose,c:when,c:otherwise)
</div>
<hr />
<div>
<div style="color:red">c:if的使用
</div>
<%
request.setAttribute("result",true);
%>
<c:set var="userName" value="张三"/>
<c:if test="${result == true}" var="flag">
欢迎${sessionScope.userName}光临!
</c:if>
<br />
你选择的答案：${flag}
<hr />
<%
HashMap map = new HashMap();
map.put("mark",1);
request.setAttribute("result1",map);
%>
<br />
<c:if test="${result1.mark == 1}">
还可以通过嵌套使用
</c:if>
<hr />
<div style="color:red">c:choose,when,otherwise的使用
</div>
<%
request.setAttribute("month",2);
%>
<c:choose>
<c:when test="${month>0 && month<4}">春
</c:when>
<c:when test="${month>3 && month<7}">夏
</c:when>
<c:when test="${month>6 && month<10}">秋
</c:when>
<c:when test="${month>9 && month<13}">冬
</c:when>
<c:otherwise>错误
</c:otherwise>
</c:choose>
</div>
<hr />
</body>
</html>
<!-- e3 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here
</title>
</head>
<body>
<div style="color:red;font-size:30px;">循环标签的使用(c:forEach,c:fortokens)
</div>
<hr />
<div>
<div style="color:red">c:forEach的使用
</div>
<%
List<String> list = new ArrayList<String>();
list.add("aaa1");
list.add("aaa2");
list.add("aaa3");
request.setAttribute("list",list);
%>
<c:forEach items="${list}" var="str" varStatus="xh">
${xh.count}序号从1开始,
${xh.index}序号从0开始,
${xh.last}最后一个序号,
${xh.first}第一个序号,
:${str}<br/>
</c:forEach>
<br />
<hr />
<div style="color:red">c:forEach的使用(空指针不会报错)
</div>
<% request.setAttribute("list1",null);%>
<c:forEach items="${list1}" var="str">
${str}<br/>
</c:forEach>
<br />
<hr />
<div style="color:red">c:forEach的使用(数组使用)
</div>
<%
String[] nums = { "1", "2", "3", "4", "5", "6", "7", "8", "9"};
request.setAttribute("nums",nums);
%>
<c:forEach items="${nums}" var="num">
${num}<br />
</c:forEach>
<br />
<hr />
<div style="color:red">c:forEach的使用(下标从0开始)
</div>
<c:forEach items="${nums}" var="num" begin="1" end="7" step="2">
${num}<br />
</c:forEach>
<br />
<div style="color:red">c:forEach的使用(数组使用)
</div>
<%
ArrayList array = new ArrayList();
HashMap m = new HashMap();
m.put("name","张三");
array.add(m);
m = new HashMap();
m.put("name","李四");
array.add(m);
m = new HashMap();
m.put("name","王五");
array.add(m);
m = new HashMap();
m.put("name","赵六");
array.add(m);
m = new HashMap();
m.put("name","林奇");
array.add(m);
request.setAttribute("result_list", array);
%>
<c:forEach items="${result_list}" var="user">
${user.name}<br />
</c:forEach>
<br />
<hr />
<div style="color:red">c:forTokens的使用
</div>
<c:forTokens items="a:b:c:d" delims=":" var="token">
<c:out value="${token}"/>
</c:forTokens>
</body>
</html>
<!-- e4 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ 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=UTF-8">
<title>Insert title here
</title>
</head>
<body>
<div style="color:red;font-size:30px;">格式化标签的使用
</div>
<hr />
<div style="color:red">fmt:formatNumber的使用
</div>
<fmt:formatNumber value="0.3" type="number"/><br />
<fmt:formatNumber value="0.3" type="currency"/><br />
<fmt:formatNumber value="0.3" type="percent"/><br />
<br />
<hr />
<div style="color:red">fmt:formatNumber的使用(精确小数点)
</div>
<fmt:formatNumber value="12.31" pattern=".0000"/><br/>
<fmt:formatNumber value="1245678.61" pattern="#"/><br/>
<br />
<hr />
<div style="color:red">fmt:formatDate的使用
</div>
<fmt:formatDate value="<%=new Date()%>" /><br/>
<fmt:formatDate value="<%=new Date()%>" type="time"/><br/>
<fmt:formatDate value="<%=new Date()%>" pattern="yyyy/MM/dd hh:mm:ss" /><br />
<fmt:formatDate value="<%=new Date()%>" pattern="yyyy-MM-dd HH:mm:ss" /><br />
<fmt:formatDate value="<%=new Date()%>" pattern="yyyy年MM月dd日 hh小时mm分钟ss秒" /><br />
<fmt:formatDate value="<%=new Date()%>" pattern="yy/MM/dd hh:mm:ss" /><br />
<hr>
</body>
</html>
<!-- e5 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ 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=UTF-8">
<title>Insert title here
</title>
</head>
<body>
<div style="color:red;font-size:30px;">EL表达式使用
</div>
<div style="color:red">算术运算符
</div>
<hr />
加：1+1 = ${1+1}<br/>
减：1-1 = ${1-1}<br/>
乘：1*2 = ${1*2}<br/>
除： 3/2 = ${3/2}<br/>
模： 3%2 = ${3%2}<br/>
<div style="color:red">关系运算符
</div>
<hr />
1==1:${1==1}<br/>
1!=1:${1!=1}<br/>
1<2:${1<2}<br/>
1>2:${1>2}<br/>
1<=2:${1<=2}<br/>
1>=2:${1>=2}<br/>
<div style="color:red">逻辑运算符
</div>
<hr />
<%
request.setAttribute("a",true);
request.setAttribute("b",false);
%>
a=true,b=false<br/>
${a && b}<br/>
${a || b}<br/>
${!a}<br/>
<div style="color:red">三元运算符
</div>
<hr />
1 > 1 ? "真" : "假" = ${1 > 1 ? "真" : "假"}
<div style="color:red">empty会帮你判断size=0的情况
</div>
<hr />
<% request.setAttribute("list",new ArrayList());%>
<c:if test="${empty list}">empty判断list没有数据
</c:if>
</body>
</html>
<!-- e6 -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ 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=UTF-8">
<title>Insert title here
</title>
</head>
<body>
<div style="color:red;font-size:30px;">set,remove,catch 标签使用
</div>
<div style="color:red">set的使用
</div>
<hr />
<c:set var="userName" value="张三" scope="request" />
<c:set var="userName" value="李四" scope="session" />
<c:set var="userName" value="王五" scope="application" />
<%=request.getAttribute("userName") %><br/>
<%=session.getAttribute("userName") %><br/>
<%=application.getAttribute("userName") %><br/>
<br/>
<div style="color:red">remove的使用
</div>
<hr />
<c:remove var="userName" scope="request" />
<c:remove var="userName" scope="session" />
<c:remove var="userName" scope="application" />
remove后的值：<%=request.getAttribute("userName") %><br/>
remove后的值：<%=session.getAttribute("userName") %><br/>
remove后的值：<%=application.getAttribute("userName") %><br/>
<br/>
<div style="color:red">catch的使用
</div>
<hr />
<c:catch var="error_Message">
<%
int i = Integer.parseInt("a");
%>
</c:catch>
${error_Message}
</body>
</html>
要使用jstl标签库的话:需要自己下载jar包 jstl.jar&standard.jar
效果图:
转载于:https://www.cnblogs.com/Toolo/p/3737287.html
相关资源：JSP中的JSTL标签库的用法
