ViewIPTag.java
package tag2;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class ViewIPTag extends TagSupport {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public int doStartTag() throws JspException {
// TODO Auto-generated method stub
String IP = this.pageContext.getRequest().getRemoteAddr();
try {
this.pageContext.getOut().write("IP:"+IP+" name:"+name);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return super.doStartTag();
}
}
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 taglib.tld
<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 web-jsptaglibrary_2_0.xsd"
version="2.0">
<tlib-version>1.0</tlib-version>
<short-name>goby</short-name>
<uri>/taglib</uri>
<tag>
<name>ShowViewIP</name>
<tag-class>tag2.ViewIPTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>name</name>
<required>true</required>
</attribute>
</tag>
</taglib> Â
index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="/taglib" prefix="goby" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
aa,<goby:ShowViewIP name="goby"/>
</body>
</html>
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