自定义JSP标签

 1 package com.skyer;
 2 
 3 import java.io.StringWriter;
 4 
 5 import javax.servlet.jsp.JspException;
 6 import javax.servlet.jsp.tagext.Tag;
 7 import javax.servlet.jsp.tagext.TagSupport;
 8 
 9 public class MyTag extends TagSupport {
10 
11     private static final long serialVersionUID = 1L;
12 
13     private String display;
14 
15     @Override
16     public int doStartTag() throws JspException {
17         if ("1".equals(display)) { // 1的时候显示
18             return Tag.EVAL_BODY_INCLUDE;
19         } else if ("0".equals(display)) { // 0的时候不显示
20             return Tag.SKIP_BODY;
21         } else { // 其他的都不显示
22             return Tag.SKIP_BODY;
23         }
24     }
25 
26     public void setDisplay(String display) {
27         this.display = display;
28     }
29 
30 }

 1 <?xml version="1.0" encoding="UTF-8"?>     
 2 <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
 3 <taglib>
 4     <tlib-version>1.0</tlib-version>
 5     <jsp-version>2.0</jsp-version>
 6     <short-name>my</short-name>
 7     
 8     <tag>
 9         <name>MyTag</name>
10         <tag-class>com.skyer.MyTag</tag-class>
11         <body-content>jsp</body-content>
12         <attribute>
13             <name>display</name>
14             <required>true</required>
15         </attribute>
16     </tag>
17     
18 </taglib>

1 <%@ taglib uri="/WEB-INF/MyTag.tld" prefix="my" %>

1 <my:MyTag display="1">
2 　　<font color="red">Hello Tag!</font>
3 </my:MyTag>