RemoveWhitespace.java

package com.test.wemblog
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import javax.servlet.jsp.JspWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
 * wemblog:removeWhitespace tag removes whitespace between HTML elements
 */
public class RemoveWhitespace extends BodyTagSupport
{
  private static final Logger LOGGER = LoggerFactory.getLogger(RemoveWhitespace.class);
  private static final String REGEX_WHITESPACE_BETWEEN_HTML = "[>]{1}\\s+[<]{1}";
  private static final String REGEX_REPLACE_BETWEEN_HTML = "><";
  public void setBodyContent(BodyContent bc)
  {
    super.setBodyContent(bc);
  }
  @Override
  public int doAfterBody()
  {
    try
    {
      BodyContent bodyContent = super.getBodyContent();
      JspWriter out = bodyContent.getEnclosingWriter();
      String html = bodyContent.getString();
      out.print(html.replaceAll(REGEX_WHITESPACE_BETWEEN_HTML, REGEX_REPLACE_BETWEEN_HTML));
    }
    catch (IOException e)
    {
      LOGGER.debug("wemblog:removeWhitespace error: " + e.getMessage());
    }
    return SKIP_BODY;
  }
}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee" version="2.1">
    <tlib-version>5.4.0-SNAPSHOT</tlib-version>
    <short-name>wemblog</short-name>
    <uri>http://www.wemblog.com</uri>  
 <tag>
    <name>removeWhitespace</name>
    <tagclass>com.test.wemblog.RemoveWhitespace</tagclass>
    <body-content>scriptless</body-content>
    <info>Remove Whitespace</info>
  </tag>
</taglib>