JSP Example to create custom tag that will append a String to its own body and will display the result

JSP Example   to create custom tag that will append a String to its own body and will display the result

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>

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