备忘：现有项目JSTL使用汇总

准备公用页面，供其它页面进行引用：tablibs.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<c:set var="ctx" value="${pageContext.request.contextPath}"/>

JSP页面调用方式

<%@ include file="/taglibs.jsp"%>

用法

设置变量标签

<c:set var="ctx" value="${pageContext.request.contextPath}"/>

条件标签

//字符串比较
<c:if test="${xxx eq '1'}">selected="selected"</c:if>
<c:if test="${aaa ne '3'}">selected="selected"</c:if>

//数值比较
<c:if test="${xxx==0}">selected="selected"</c:if>
<c:if test="${xxx!=0}">selected="selected"</c:if>
<c:if test="${xxx>0}">selected="selected"</c:if>
<c:if test="${xxx<0}">selected="selected"</c:if>
<c:if test="${xxx>=0}">selected="selected"</c:if>
<c:if test="${xxx<=0}">selected="selected"</c:if>

//数值计算
<c:if test="${index%2==0}">selected="selected"</c:if>
<c:if test="${money/10000>=10000}">selected="selected"</c:if>
<c:if test="${aaa-bbb>0}">selected="selected"</c:if>

//变量比较
<c:if test="${aaa eq bbb }"> selected="selected"</c:if>
<c:if test="${aaa ne bbb }"> selected="selected"</c:if>

//多条件
<c:if test="${empty xxxList || xxxList.length eq '1' }">selected="selected"</c:if>
<c:if test="${aaa && bbb eq '1' && ccc ne '2'}">selected="selected"</c:if>

//boolean值,xxx为true或false
<c:if test="${xxx}">selected="selected"</c:if>

//是否不为空，用于list
<c:if test="${!empty xxxList}">selected="selected"</c:if>
<c:if test="${!empty aa.xxxList}">selected="selected"</c:if>

//是否为空，用于list
<c:if test="${empty xxxList}">selected="selected"</c:if>
<c:if test="${empty aa.xxxList}">selected="selected"</c:if>

迭代标签

<c:forEach items="${xxxList}" var="record" varStatus="status">
//xxｘList:系统返回的列表
//record:本次循环中定义的变量
//status:列表状态
${status.count}//列表计数
</c:forEach>

<c:forEach var="img" items="${fn:split(xxx,',')}">
//使用fn.split将xxx用“,”分隔后做为list,供forEach使用
</c:forEach>

选择标签

<c:choose>
<c:when test="条件1">
//test的用法同if test
</c:when>
<c:when test="条件2">

</c:when>
.....
<c:when test="条件N">

</c:when>
<c:otherwise>
//条件都不满足时
</c:otherwise>
</c:choose>

格式化标签

//数值格式化
<fmt:formatNumber value="${money}" pattern="#0.00"></fmt:formatNumber>
<fmt:formatNumber value="${money}" pattern="###0.00"></fmt:formatNumber>

//时间格式化
<fmt:formatDate var="nowStr" value="${nowDate}" pattern="yyyy/MM/dd HH:mm:ss"/>

//时间字符串解析
<fmt:parseDate var="create_date" value="${nowDate}" pattern="yyyy-MM-dd HH:mm:ss"/>

字符串处理函数

//求长度
<c:if test="${fn:length(content) > 20}"></c:if>

//分隔
<c:forEach items="${fn:split(content,',')}" var="rd">
</c:forEach>

//字符串截取
${fn:substring(content,0,10)}

实例

下拉菜单

<select name="status">
<option></option>
<option value="1" <c:if test="${status eq '1'}">selected="selected"</c:if> >已到账</option>
<option value="2" <c:if test="${status eq '2'}">selected="selected"</c:if> >未到账</option>
<c:forEach var="record" items="list" varStatus="st">
<option value="${record.key}" <c:if test="${record.key eq '2'}">selected="selected"</c:if> >${record.value}</option>
</c:forEach>
</select>

Input Radio

<input type="radio" value="1" name="status" <c:if test="${status eq '1' }">checked="checked"</c:if>>已到账
<input type="radio" value="2" name="status" <c:if test="${status eq '2' }">checked="checked"</c:if>>未到账