日期:2014-05-16 浏览次数:20549 次
/*
实现功能:自己来定义一个标签,用于jsp中
日期:20130930
作者:烟大阳仔
*/
1.编写一个实现tag接口的JAVA类
public int doStartTag() throws JspException {
HttpServletRequest request=(HttpServletRequest)this.pageContext.getRequest();
JspWriter out=this.pageContext.getOut();
String ip=request.getRemoteAddr();
try {
out.print(ip);
} catch (IOException e) {
throw new RuntimeException(e);
}
return super.doStartTag();
}
2.在tld文件中对标签处理器进行描述(tld文件的位置WEB-INF里面)
<?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>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>TagLib</short-name>
<uri>/TagLib</uri>
<tag>
<name>VeiwIP</name>
<tag-class>cn.com.web.tag.TagLibIP</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
3.在jsp页面中使用标签
<body>
你的IP地址是:<TagLib:VeiwIP/>
</body>