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jsp自定义标签（tld）

2017-09-04 11:01 375 查看

转自：http://blog.sina.com.cn/s/blog_4b5bc01101010knj.html

一、首先写一个类继承TagSupport

MyTag.java

public class MyTag extends TagSupport{
public String username="";
public int doEndTag() throws JspException {
  JspWriter out = pageContext.getOut();
  try {
   out.print("<table border=\"1\">");
   out.print("<tr>");
   out.print("<td>"+username+"");
   out.print("</td>");
   out.print("</tr>");
   out.print("</table>");
   out.flush();
   //out.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
    return TagSupport.EVAL_PAGE;//<body-content>设置不为空，则必须返回 EVAL_BODY_INCLUDE
  }
public void setUsername(String username) { //必须有该方法
  this.username = username;
}

}

二、myTag_1.tld(TlD文件
放在WEB-INF下)

<?xml
version="1.0" encoding="UTF-8"?>

<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "web-

jsptaglibrary_1_2.dtd" >

<taglib>

<tlib-version>tlib-version</tlib-version>

<jsp-version>jsp-version</jsp-version>

<short-name>myTag</short-name> 

<tag>

  <name>myTag</name>

  <tag-class>com.tjw.customTag.MyTag</tag-class>

  <body-content>empty</body-content> 

  <attribute>


   <name>username</name> 

   <required>true</required>

   <rtexprvalue>true</rtexprvalue> 

  </attribute>

</tag>

</taglib>

三、jsp页面:

<%@
page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%@ taglib prefix="mt" uri="WEB-INF/myTag_1.tld" %>

<!DOCTYPE
HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

  </head>

  <body>

    This is my JSP page. <br>

    <br>

    <mt:myTag username="hello good!" />

  </body>

</html>

四、浏览器查看源代码，显示为
  <body>

    This is my JSP page. <br>

    <br>

    <table border="1"><tr><td>hello good!</td></tr></table>

  </body>

若深入理解BodyTagSupport，可参考：http://blog.csdn.net/muzizhuben/article/details/6651195

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