第一个自定义标签

lan.tld
<?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>lan</short-name>
    <uri>127.0.0.1</uri>
    
    <tag>
        <name>viewIP</name>
		<tag-class>com.lan.web.tag.ViewIPTag</tag-class>
		<body-content>empty</body-content>
    </tag>
    
</taglib>

    

ViewIPTag.java

package com.lan.web.tag;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

public class ViewIPTag extends TagSupport {

	@Override
	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();
	}
	
}
mytag.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="127.0.0.1" prefix="lan"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
IP:
<lan:viewIP/>
</body>
</html>
第一个自定义标签_第1张图片

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