web应用的结构：
web.xml
classes diegoyun OutputTag.class
WEB-INF src diegoyun OutputTag.java
mytag tlds diego.tld
tag.jsp
细节：
web.xml:
1 <?xml version="1.0" encoding="GBK"?>
2 <web-app xmlns="http://java.sun.com/xml/ns/javaee"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
5 http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
6 version="3.0">
7 </web-app>
OutputTag.java:
1 package diegoyun;
2 import javax.servlet.jsp.JspException;
3 import javax.servlet.jsp.JspWriter;
4 import javax.servlet.jsp.tagext.TagSupport;
5
6 public class OutputTag extends TagSupport
7 {
8 private String name=null;
9 public void setName(String name)
10 {
11 this.name = name;
12 }
13
14 public int doStartTag() throws JspException{
15 try
16 {
17 JspWriter out = pageContext.getOut();
18 out.print("Hello! " + name);
19 }
20 catch (Exception e)
21 {
22 throw new JspException(e);
23 }
24 return EVAL_PAGE;
25 }
26 }
diego.tld:
1 <?xml version="1.0" encoding="GBK" ?>
2
3 <taglib xmlns="http://java.sun.com/xml/ns/j2ee"
4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd"
6 version="2.0">
7 <tlib-version>1.0</tlib-version>
8 <short-name>diego</short-name>
9 <!--OutputTag-->
10 <tag>
11 <name>out</name>
12 <tag-class>diegoyun.OutputTag</tag-class>
13 <body-content>empty</body-content>
14 <attribute>
15 <name>name</name>
16 <required>false</required>
17 <rtexprvalue>false</rtexprvalue>
18 </attribute>
19 </tag>
20 </taglib>
tag.jsp:
1 <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
2
3 <%@ taglib uri="/WEB-INF/tlds/diego.tld" prefix="diego"%>
4 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
5 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
6 <html xmlns="http://www.w3.org/1999/xhtml">
7 <body>
8 Test Tag:
9 <diego:out name="diegoyun"/>
10 </body>
11 </html>
时间： 2024-10-14 23:44:49