本文介绍如何通过自定义JSP标签库实现一个简单的性别转换功能，包括配置web.xml，定义tld文件，实现Java类以及在JSP页面中的使用方法。
[color=blue]web.xml代码：下 [/color]
<jsp-config>
<taglib>
<taglib-uri>/my-function</taglib-uri>
<taglib-location>
/WEB-INF/tags/my-function.tld
</taglib-location>
</taglib>
</jsp-config>
[color=blue]function.tld代码：下[/color]
<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" 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">
<description>处理EL转换的自定义函数</description>
<tlib-version>1.0</tlib-version>
<short-name>my-function</short-name>
<uri>/my-function</uri>
<function>
<description>获取性别(男/女)</description>
<name>getSex</name>
<function-class>com.util.MyFunction</function-class>
<function-signature>
java.lang.String getSex( java.lang.String )
</function-signature>
</function>
</taglib>
[color=blue]MyFunction.java代码：下
(可在MyFunction类中根据需要写如自己的方法)[/color]
public class MyFunction {
public static String getSex(String sex) {
return ("M".equals(sex) ? "男" : "女");
}
}
[color=blue]test.jsp代码：下[/color]
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
[color=red]<%@ taglib prefix="my" uri="/my-function"%>[/color]
<html>
<head>
<title>个人信息</title>
</head>
<body>
<tableborder="1" align="center">
<tr>
<th>
性 别
</th>
<td>
[color=red]${my:getSex(sex)}[/color]
</td>
</tr>
</table>
</body>
</html>
<jsp-config>
<taglib>
<taglib-uri>/my-function</taglib-uri>
<taglib-location>
/WEB-INF/tags/my-function.tld
</taglib-location>
</taglib>
</jsp-config>
[color=blue]function.tld代码：下[/color]
<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd">
<description>处理EL转换的自定义函数</description>
<tlib-version>1.0</tlib-version>
<short-name>my-function</short-name>
<uri>/my-function</uri>
<function>
<description>获取性别(男/女)</description>
<name>getSex</name>
<function-class>com.util.MyFunction</function-class>
<function-signature>
java.lang.String getSex( java.lang.String )
</function-signature>
</function>
</taglib>
[color=blue]MyFunction.java代码：下
(可在MyFunction类中根据需要写如自己的方法)[/color]
public class MyFunction {
public static String getSex(String sex) {
return ("M".equals(sex) ? "男" : "女");
}
}
[color=blue]test.jsp代码：下[/color]
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
[color=red]<%@ taglib prefix="my" uri="/my-function"%>[/color]
<html>
<head>
<title>个人信息</title>
</head>
<body>
<tableborder="1" align="center">
<tr>
<th>
性 别
</th>
<td>
[color=red]${my:getSex(sex)}[/color]
</td>
</tr>
</table>
</body>
</html>
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