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JMockit Coverage is a code coverage tool with several metrics (line, path, data) capable of generating HTML reports. It is designed with ease of use in mind, avoiding the need for complex configuration. Instead, smart (but overridable) defaults are employed, such as the selection of which classes to consider for coverage, and where to find sources files for report generation.

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/*
 * Copyright (c) 2006-2014 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.reporting;

import java.io.*;
import java.security.*;

import org.jetbrains.annotations.*;

final class StaticFiles
{
   @NotNull private final String outputDir;
   private long lastModifiedTimeOfCoverageJar;

   StaticFiles(@NotNull String outputDir) { this.outputDir = outputDir; }

   void copyToOutputDir(boolean forSourceFilePages) throws IOException
   {
      copyFile("coverage.css");
      copyFile("coverage.js");
      copyFile("logo.png");
      copyFile("package.png");
      copyFile("class.png");
      copyFile("abstractClass.png");
      copyFile("interface.png");
      copyFile("annotation.png");
      copyFile("exception.png");
      copyFile("enum.png");

      if (forSourceFilePages) {
         copyFile("prettify.js");
      }
   }

   private void copyFile(@NotNull String fileName) throws IOException
   {
      File outputFile = new File(outputDir, fileName);

      if (outputFile.exists() && outputFile.lastModified() > getLastModifiedTimeOfCoverageJar()) {
         return;
      }

      //noinspection IOResourceOpenedButNotSafelyClosed
      OutputStream output = new BufferedOutputStream(new FileOutputStream(outputFile));
      InputStream input = new BufferedInputStream(StaticFiles.class.getResourceAsStream(fileName));

      try {
         int b;

         while ((b = input.read()) != -1) {
            output.write(b);
         }
      }
      finally {
         try {
            input.close();
         }
         finally {
            output.close();
         }
      }
   }

   private long getLastModifiedTimeOfCoverageJar()
   {
      if (lastModifiedTimeOfCoverageJar == 0) {
         CodeSource codeSource = getClass().getProtectionDomain().getCodeSource();

         if (codeSource == null) {
            lastModifiedTimeOfCoverageJar = -1;
         }
         else {
            String pathToThisJar = codeSource.getLocation().getPath();
            lastModifiedTimeOfCoverageJar = new File(pathToThisJar).lastModified();
         }
      }

      return lastModifiedTimeOfCoverageJar;
   }
}