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标签简介和开发第一个标签
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@taglib uri="/itcast" prefix="itcast" %> 3 4 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 5 <html> 6 <head> 7 8 <title>My JSP ‘1.jsp‘ starting page</title> 9 10 </head>11 12 <body>13 您的IP是:14 <itcast:viewIP/>15 </body>16 </html>
1 package cn.itcast.web.tag; 2 3 import java.io.IOException; 4 5 import javax.servlet.http.HttpServletRequest; 6 import javax.servlet.jsp.JspException; 7 import javax.servlet.jsp.JspWriter; 8 import javax.servlet.jsp.tagext.TagSupport; 9 10 11 public class ViewIPTag extends TagSupport {12 13 public int doStartTag() throws JspException{14 15 HttpServletRequest request = (HttpServletRequest) this.pageContext.getRequest();16 JspWriter out = this.pageContext.getOut();17 18 String ip = request.getRemoteAddr();19 try {20 out.print(ip);21 } catch (IOException e) {22 throw new RuntimeException();23 }24 25 return super.doStartTag();26 }27 28 29 30 31 32 }
1 <?xml version="1.0" encoding="UTF-8" ?> 2 3 4 <taglib xmlns="http://java.sun.com/xml/ns/j2ee" 5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 6 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" 7 version="2.0"> 8 <description>A tag library exercising SimpleTag handlers.</description> 9 <tlib-version>1.0</tlib-version>10 <short-name>itcast</short-name>11 <uri>/itcast</uri>12 13 <tag>14 <name>viewIP</name>15 <tag-class>cn.itcast.web.tag.ViewIPTag</tag-class>16 <body-content>empty</body-content>17 </tag>18 19 20 </taglib>
1、编写一个实现tag接口的Java类
2、在tlb文件中对标签处理器类进行描述(tlb文件位置:WEB-INF下,可以抄)
3、在JSP页面中导入和使用自定义标签
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