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Jsp:taglib实现

2024-07-02 20:36:26   229人阅读

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>

 


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