总结-EL表达式

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

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

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

1 字符串连接

${"abc".concat("123")}

2 split

<c:forEach items="${fn:split(‘1,2,3‘, ‘,‘)}" var="str"></c:forEach>

3 length

${fn:length("abc")}

${fn:length(fn:split("a,b,c", ","))}

4 substring

${fn:substring("abc", 0, fn:length("abc"))}

5 contains

${fn:contains("abc", "a")} （containsIgnoreCase）

不能用于数组、集合（用于数组、集合时，会用对象toString后的字符串来执行，显然不准确）

6 replace

${fn:replace("abbc", "b", "B")}