Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.

14.7 Including or Manipulating the Tag Body Multiple Times

339

Listing 14.19 defines a tag that repeats the body content the number of

times specified by the 

reps

 attribute. Since the body content can contain JSP

(which gets made into servlet code at page translation time but invoked at

request time), each repetition does not necessarily result in the same output

to the client.

Listing 14.19 RepeatTag.java  

package coreservlets.tags;

import javax.servlet.jsp.*;

import javax.servlet.jsp.tagext.*;

import java.io.*;

/** A tag that repeats the body the specified

 *  number of times.

 */

public class RepeatTag extends BodyTagSupport {

  private int reps;

  public void setReps(String repeats) {

    try {

      reps = Integer.parseInt(repeats);

    } catch(NumberFormatException nfe) {

      reps = 1;

    }

  }

  public int doAfterBody() {

    if (reps   >= 1) {

      BodyContent body = getBodyContent();

      try {

        JspWriter out = body.getEnclosingWriter();

        out.println(body.getString());

        body.clearBody(); // Clear for next evaluation

      } catch(IOException ioe) {

        System.out.println("Error in RepeatTag: " + ioe);

      }

      return(EVAL_BODY_TAG);

    } else {

      return(SKIP_BODY);

    }

  }

}

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.