自定义标签(二) 增加属性

最新推荐文章于 2024-05-06 16:49:30 发布

最新推荐文章于 2024-05-06 16:49:30 发布 · 165 阅读

文章标签：

#Java #JSP #Servlet #HTML #SUN

tag标签专栏收录该内容

5 篇文章

订阅专栏

本文介绍了一个自定义的JSP标签ViewIPTag的实现方式，该标签能够获取客户端的IP地址并将其与指定的名字一同显示。通过定义taglib文件及使用特定的XML命名空间和前缀，使得在JSP页面中可以轻松调用这个标签。

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();
	}
	
}

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>

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>