JSTL常用便签choose和JSTL常用便签foreach

2. choose ：相当于 java 代码的 switch 语句

1．使用 choose 标签声明    相当于switch

2．使用 when 标签做判断   相当于case

3，使用 otherwise 标签做其他情况的声明  相当于default

request . setAttribute ( " number ", 51);
< C : choose >
< c : when test ="${ number ==1}"＞星期一＜/ c : when >
< c : when test ="${ number =2}"＞星期二＜/ c : when >
< c : when test ="${ number ==3}"＞星期三＜/ c : when >
< c : when test ="${ number ==4}"＞星期四＜/ c : when >
< c : when test ="${ number =5}"＞星期五＜/ c : when >
< c : when test ="${ number =6}"＞星期六＜/ c : when >
< c : when test ="${ number ==7}"＞星期天＜/ c : when >
< c : otherwise ＞数字输入有误＜/ c : otherwise >
</ c : choose >

foreach相当于JAVA代码中的for循环

< c : forEach begin ="1" end ="10" var =" i ＂ step ="2" varStatus =" s ">
${ i }<h3>${ s . index }<h3><h4>${ s . count }</h4>< br >
</ c : forEach >
< hr >

 List list = new ArrayList (); list . add (" aaa ");
 list . add (" bbb ");
 list . add (" ccc ");
 request . setAttribute ( "1ist", list );

%>
< c : forEach items ="${ list }” ar =" str " varStatus =" s ">
${ s . index }${ s . count }${ str }< br >
</ c : forEach >