jstl最常用的标签之<c:out>

一定义

<c:out>用于把计算的结果输出到JspWrite对象。

二代码

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

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

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" ; >

< html >

< head >

< title > My JSP 'c_out.jsp' starting page </ title >

</ head >

< body >

//这句话本身应该放在控制器中，这里只是为了测试

//如果我们的域对象中有相同的属性名，c:out的优先级是：pageContext>request>session>application

request.setAttribute( "abc" , "您好" );

session.setAttribute( "abcd" , "您好<a href=' http://www.baidu.com'>百度</a>" ; );

application.setAttribute( "abc" , "您好2" );

pageContext.setAttribute( "abc" , "您好3" );

User user= new User();

user.setName( "小明" );

user.setAge(30);

request.setAttribute( "user1" ,user);

//out.println("hello,wolrd");

< h3 > 基本输出 </ h3 >

< c:out value = "Hello,world" ></ c:out >

< h3 > 如何输出request/session/application/pageContext域对象的数据 </ h3 >

< c:out value = " ${abc} " ></ c:out >

< h3 > 输出默认值 </ h3 >

< c:out value = " ${abcc} " default = "没有值" ></ c:out >

< h3 > 以 html 样式输出，默认true表示文本 false以 html 形式 </ h3 >

< c:out value = " ${abcd} " default = "没有值" escapeXml = "false" ></ c:out >

< h3 > 如何输出对象 </ h3 >

< c:out value = " ${user1.name} " ></ c:out > || < c:out value = " ${user1.age} " ></ c:out ></ br >

${user1.name}@@${user1.age*20}

</ body >

</ html >

三测试结果