1核心標簽庫

c:out

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>

HTML轉義輸出

xxx

xxx">

${fn:escapeXml('xxx') }

輸出默認值

<%

String addr = "西二旗";

//pageContext.setAttribute("addr",addr);

%>

${addr == null?"北京" : addr }

輸出變量

<%

String name = "無雙";

pageContext.setAttribute("name",name);

%>

${name }

輸出常量

${"啦啦啦啦" }

c:set

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@page import="com.itheima.domain.Person"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

修改域中的JavaBean的屬性的值

<%

Person p = new Person();

pageContext.setAttribute("p",p);

%>

${p.name }

設置或修改域中的Map的值

<%

Map map = new HashMap();

pageContext.setAttribute("map",map);

%>

${map.cellphone }

設置或修改域中的屬性值

${name }

c:remove刪除所有域中同名標簽

c:catch捕獲異常

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

"e">

<%

int i = 1/0;

%>

${e.message } //輸出異常

C:if

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

1}">//沒有else..

確實是這樣的....

你確定嗎?

c:choose

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%

int day = 7;

pageContext.setAttribute("day",day);

%>

星期一

星期二

星期三

星期四

星期五

休息日!

C:forEach*

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

實驗：遍歷10到100的偶數(shù)，如果數(shù)字所在的位置是3的倍數(shù)，顯示成紅色

${i }

${i }

循環(huán)執(zhí)行指定的內(nèi)容若干次

step="2"var="i" >//每次自加2

${i },

遍歷Map中的數(shù)據(jù)

<%

Map map = new LinkedHashMap();

map.put("name","曹操");

map.put("age","59");

map.put("wife","小喬");

map.put("gender","男");

pageContext.setAttribute("map",map);

%>

${entry.key }:${entry.value }

遍歷集合中的數(shù)據(jù)

<%

List list = new ArrayList();

list.add("美國");

list.add("中國");

list.add("俄羅斯");

list.add("印度");

list.add("巴西");

pageContext.setAttribute("list",list);

%>

${c }

遍歷數(shù)組中的數(shù)據(jù)

<%

String []? city = {"北京","上海","廣州","鐵嶺","葫蘆島"};

pageContext.setAttribute("city",city);

%>

${c }

C:fortokens

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

//用.分割items="www.itheima.com"字符串

${str }

C:import包含頁面