How to access body of Custom tags in JSP tutorial

时间：2022-11-26 13:35:18

 

In the last tutorial we learnt  how to create and use custom tags in JSP . In this tutorial we will see how to access the body of custom tag. For e.g. If our custom tag is  xyz  then we would learn to access the content between <prefix: xyz>  and  </prefix:xyz> 
<prefix: xyz>
Body of custom tag: This is what we will access in the below example
</prefix:xyz>

　　

Example:
In this example or custom tag will append a String to its own body and will display the result.

Tag handler class: Details.java

package beginnersbook.com;
import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
import java.io.*;

public class Details extends SimpleTagSupport {
   //StringWriter object
   StringWriter sw = new StringWriter();

   public void doTag() throws JspException, IOException
   {
       getJspBody().invoke(sw);
       JspWriter out = getJspContext().getOut();
       out.println(sw.toString()+"Appended Custom Tag Message");
   }
}

　　

TLD file: message.tld
Remember to have this file in WEB-INF folder.

<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>2.0</jsp-version>
<short-name>My Custom Tag: MyMsg</short-name>
<tag>
<name>MyMsg</name>
<tag-class>beginnersbook.com.Details</tag-class>
<body-content>scriptless</body-content>
</tag>
</taglib>

　　

JSP Page: index.jsp

<%@ taglib prefix="myprefix" uri="WEB-INF/message.tld"%>
<html>
<head>
  <title>Accessing Custom Tag Body Example</title>
</head>
<body>
  <myprefix:MyMsg>
    Test String
  </myprefix:MyMsg>
</body>
</html>

　　

Output:

Test String Appended Custom Tag Message

　　

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