标签：self-defined tag
一.WEB-INFO下的*.tld自定义标签描述文件PAFTaglib.tld
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
version="2.1">
<tlib-version>1.1</tlib-version>
<short-name>paf</short-name>
<uri>http://paf.taglib</uri>
/**<function>可以让我们在jsp中直接调用某个方法,根据自定义的方法返回指定的值,兼容jstl标签,省去了在jsp中直接使用<%!%>来定义方法体再调用的繁琐.如果你用过el语言的话估计会很快上手,其实<function>标签 就是一个拥有方法体的el语言.注意:function所定义的方法必须需要是静态的,如果不是静态的话jstl是不能识别所定义的方法；不用再继承TagSupport、BodyTagSupport、SimpleTagSupport中的一个*/
<function>
<name>getParamByServerBeanByPageNameByParamName</name>
<!--specified handle class, full path-->
<function-class>com.hp.it.techasmts.web.util.TaglibUtil</function-class>
<!--specified actual handle method in handle calss,full path-->
/**在<function-signature>需要写完整的类名,假如是String类型的话就必须写成java.lang.String,不支持泛型的定义如java.util.List<java.lang.String>，eclipse会把<>当作xml的
格式来判断的,所以就省略该泛型的定义.*/
<function-signature>java.lang.String getParamByPageNameByParamName(
com.hp.it.techasmts.web.data.RequestUtilServerBean,
java.lang.String, java.lang.String)
</function-signature>
</function>
<function>
<name>getParameterByRequestPageNameByParameterName</name>
<function-class>com.hp.it.techasmts.web.util.TaglibUtil</function-class>
<function-signature>java.lang.String getParameterByRequestPageNameByParameterName(
com.hp.it.techasmts.web.data.RequestPagesViewHelper,
java.lang.String, java.lang.String)
</function-signature>
</function>
</taglib>
二.实际的处理类和方法TaglibUtil
public class TaglibUtil {
/**
* @param target
* the target bean
* @param pageName
* the param used in the target bean
* @param paramName
* the param used in the target bean
* @return the target method result
*/
public static String getParamByPageNameByParamName(RequestUtilServerBean target, String pageName, String paramName) {
return target.getParamByPageNameByParamName(pageName, paramName);
}
public static String getParameterByRequestPageNameByParameterName(RequestPagesViewHelper target, String pageName, String paramName) {
return target.getParameterByRequestPageNameByParameterName(pageName, paramName);
}
}
三.在web.xml中引入定义的tld文件
<!-- enable call the customized method in the JSTL/EL expression in PAF -->
<jsp-config>
<taglib>
<taglib-uri>http://paf.taglib</taglib-uri>
<taglib-location>/WEB-INF/PAFTaglib.tld</taglib-location>
</taglib>
/**＜jsp-property-group＞定义了一组JSP的特性,这些特性实际上对应JSP的
page directive定义的特性,但通过＜jsp-property-group＞可以方便地对多个具有相同属性的JSP统一定义。*/
<jsp-property-group>
<description>
Special property group for JSP Configuration JSP example.
</description>
<display-name>JSPConfiguration</display-name>
<url-pattern>*.jsp</url-pattern>
<el-ignored>false</el-ignored>
<page-encoding>utf-8</page-encoding>
<!--若为true，表示不支持<%scripting%>语法-->
<scripting-invalid>false</scripting-invalid>
<!--设置JSP网页的抬头，扩展名为.jspf-->
<!--include-prelude>xxx.jspf</include-prelude>
<!--设置JSP网页的结尾，扩展名为.jspf-->
<include-prelude>xxx.jspf</include-prelude-->
</jsp-property-group>
</jsp-config>
四.在jsp中使用自定义标签
引入标签：<%@ taglib prefix="paf" uri="http://paf.taglib"%>
使用：
<c:choose>
<c:when test="${paf:getParameterByRequestPageNameByParameterName(requestPagesViewHelper,‘SELECT_CUSTOMER‘, ‘DEFAULT_CUSTOMER_SELECTION‘)==‘filterCustomer‘}">
$.slideTab({defaultIndex:1});// select by filter customer is default
</c:when>
<c:when test="${paf:getParameterByRequestPageNameByParameterName(requestPagesViewHelper,‘SELECT_CUSTOMER‘, ‘DEFAULT_CUSTOMER_SELECTION‘)==‘selectByFile‘}">
$.slideTab({defaultIndex:2});// select by upload file is default
</c:when>
<c:when test="${paf:getParameterByRequestPageNameByParameterName(requestPagesViewHelper,‘SELECT_CUSTOMER‘, ‘DEFAULT_CUSTOMER_SELECTION‘)==‘selectBySAIDs‘}">
$.slideTab({defaultIndex:3});// select by SAID is default
</c:when>
<c:otherwise>
$.slideTab({defaultIndex:2});// select by upload file while the param has not be set
</c:otherwise>
</c:choose>
本文出自 “六度空间” 博客，请务必保留此出处http://jasonwalker.blog.51cto.com/7020143/1434986
jsp-->self-defined tag with function tag in taglib,布布扣,bubuko.com
jsp-->self-defined tag with function tag in taglib
标签：self-defined tag
原文地址：http://jasonwalker.blog.51cto.com/7020143/1434986
