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>1.0tlib-version>
 5     jsp-version>2.0jsp-version>
 6     short-name>myshort-name>
 7     
 8     tag>
 9         name>MyTagname>
10         tag-class>com.skyer.MyTagtag-class>
11         body-content>jspbody-content>
12         attribute>
13             name>displayname>
14             required>truerequired>
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>