JSTL

JSTL

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

<fmt:bundle basename="demo.config">
<span>从 .properties 文件中读取最简单的信息输出：</span>
<fmt:message key="basemsg" />
<hr/>
<span>从 .properties 文件中读取带有可填参数的信息，填入参数并输出：</span>
<fmt:message key="msgwithparam">
<span class="notice"><fmt:param value="param-1-value" />
<span class="notice"><fmt:param value="param-2-value" />
</fmt:message>
</fmt:bundle>

<fmt:formatNumber value="12" type="currency" pattern="$.00"/> 
<br/>$12.00 
<fmt:formatNumber value="12" type="currency" pattern="$.0#"/>
<br/>$12.0
<fmt:formatNumber value="1234567890" type="currency"/>
<br/>￥1,234,567,890.00
<fmt:formatNumber value="123456.7891" pattern="#,#00.0#"/>
<br/>123,456.79
<fmt:formatNumber value="123456.7" pattern="#,#00.0#"/>
<br/>123,456.7
<fmt:formatNumber value="123456.7" pattern="#,#00.00#"/>
<br/>123,456.70
<fmt:formatNumber value="0.12" type="percent" />
<br/>12%

<fmt:formatDate  value="${now}" type="date" /><br/>
<fmt:formatDate  value="${now}" type="both" dateStyle="long" timeStyle="long" /><br/>
<fmt:formatDate  value="${now}" type="both" pattern="yyyy.MM.dd HH:mm:ss" /><br/>

<fmt:parseNumber type="number" >123.02a</fmt:parseNumber><br/>
<fmt:parseNumber type="number" pattern="#,#00.0#">123</fmt:parseNumber><br/>
<fmt:parseNumber type="number" pattern="#,#00.0#">123.00a1</fmt:parseNumber><br/>
<fmt:parseNumber type="number" pattern="#,#00.0#">3saaa</fmt:parseNumber><br/>

	符号	意义
	0	一个数位
	#	一个数位，前导零和追尾零不显示
	.	小数点分割位置
	,	组分隔符的位置
	-	负数前缀
	%	用100乘，并显示百分号
	其他任何符号	在输出字符串中包括指定符号

                 

fn:contains 判断字符串是否包含另外一个字符串 
${fn:contains('abcd', 'a')}
fn:containsIgnoreCase 判断字符串是否包含另外一个字符串(大小写无关) ${fn:containsIgnoreCase('abcd', 'A')}
fn:endsWith 判断字符串是否以另外字符串结束 
${fn:endsWith("filename.txt",".txt")}
fn:escapeXml 把一些字符转成XML表示，例如 <字符应该转为&lt; 
${fn:escapeXml('This <abc>is second String.</abc>')}
fn:escapeXml 把一些字符转成XML表示，例如 <字符应该转为&lt; 
This <abc>is second String.</abc>
fn:indexOf 子字符串在母字符串中出现的位置 
${fn:indexOf('[e-mail]', '@')}
fn:join 将数组中的数据联合成一个新字符串，并使用指定字符格开
fn:length 获取字符串的长度，或者数组的大小 
${fn:length('adsaf')}
fn:replace 替换字符串中指定的字符 
${fn:replace('123-123-44', "-", "&#149;")} 
fn:split 把字符串按照指定字符切分 
${fn:split("af;asdfa;asdf", ";")}
fn:startsWith 判断字符串是否以某个子串开始 
${fn:startsWith("as-asdfa", "100-")}
fn:substring 获取子串 
${fn:substring("asdfghjkl", 6, -1)}
fn:substringAfter 获取从某个字符所在位置开始的子串
${fn:substringAfter("as-123", "-")}
fn:substringBefore 获取从开始到某个字符所在位置的子串 
${fn:substringBefore("as-123", "-")} 
fn:toLowerCase 转为小写 
${fn:toLowerCase("A")}
fn:toUpperCase 转为大写字符 
${fn:toUpperCase("a")}
fn:trim 去除字符串前后的空格 
${fn:trim("  asd   ")}

                                         

自定义标签                    

<%@ taglib prefix="frank" uri="myjstl" %>  
${frank:t1("1a",5)}

 

<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" version="2.0">

<description>Test 0.1 functions library</description>
<display-name>Test functions</display-name>
<tlib-version>0.1</tlib-version>
<short-name>frank</short-name>
<uri>http://ps.frank.util/jstl</uri>
<function>
<description>测试</description>
<name>t1</name>
<function-class>base.service.util.jstlUtil</function-class>
<function-signature>String t1(java.lang.String, java.lang.Integer)</function-signature>
<example>
<c:if test="${frank:t1(str, count1)}">
</example>
</function>
</taglib>

  

public class jstlUtil {

	public static String t1(java.lang.String str, java.lang.Integer count) {
		String s = "";
		for (int i = 0; i < count; i++) {
			s += str;
		}
		return s;
	}
}