自定义标签tld
1、首先WEB-INF下面定义tld配置文件(以tools.tld)为例,配置如下:
<?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>tools for JSTL</description>
<display-name>Tools</display-name>
<tlib-version>1.0</tlib-version>
<short-name>t</short-name>
<uri>com.mytest.core.util.el.Tools</uri>
<function>
<description>get config value from the config file, usually named config.propertise</description>
<name>config</name>
<function-class>com.wondersgroup.core.util.el.Tools</function-class>
<function-signature>java.lang.String config(java.lang.String)</function-signature>
<example>${t:config(str)}</example>
</function>
</taglib> 2、src源代码,写实现函数 (本例应该写在Tools.java中):
/**
* 获取配置文件中的键值
*
* @param key 键名
* @return
*/
public static String config(String key) {
return ConfigConstants.getInstance().get(key);
} 3、JSp页面中声明即可使用。
<%@ taglib uri="tools" prefix="t" %>
<title>${t:config('prop.title.local')}</title>
prop.title.local对应config函数的String key参数。