http://cobertura.sourceforge.net: Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage.
  • Steven Christou 
package net.sourceforge.cobertura.reporting.html;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.sourceforge.cobertura.dsl.ReportFormat;
import net.sourceforge.cobertura.reporting.NativeReport;
import net.sourceforge.cobertura.reporting.Report;
import net.sourceforge.cobertura.reporting.ReportFormatStrategy;

public class HTMLReportFormatStrategy implements ReportFormatStrategy {
	private static final Logger log = LoggerFactory
			.getLogger(HTMLReportFormatStrategy.class);

	public void save(Report report) {
		NativeReport nativeReport = (NativeReport) report;
		try {
			new HTMLReport(nativeReport.getProjectData(), nativeReport
					.getDestinationDir(), nativeReport.getFinder(),
					nativeReport.getComplexity(), nativeReport.getEncoding());
		} catch (Exception e) {
			log.error("Saving HTML report failed.", e);
		}
	}

	public ReportFormat getName() {
		return ReportFormat.HTML;
	}
}