Read Jar from java

Read the jar file from java. It's very usefull if u wanna get some file content and this file is packed inti the jar. See this example.

public static void main(String args[]) {
  String relativeFilePath = "style/someCSSFile.css";
  String zipFilePath = "/someDirectory/someWarFile.war";
  String contents = readZipFile(zipFilePath, relativeFilePath);
  System.out.println(contents);
}

public static String readZipFile(String zipFilePath, String relativeFilePath) {
  try {
    ZipFile zipFile = new ZipFile(zipFilePath);
    Enumeration<? extends ZipEntry> e = zipFile.entries();
    
    while (e.hasMoreElements()) {
      ZipEntry entry = (ZipEntry) e.nextElement();
      // if the entry is not directory and matches relative file then
      // extract it
      if (!entry.isDirectory() && entry.getName().equals(relativeFilePath)) {
        BufferedInputStream bis = new BufferedInputStream(
          zipFile.getInputStream(entry));
        // Read the file
        // With Apache Commons I/O
        String fileContentsStr = IOUtils.toString(bis, "UTF-8");
        
        // With Guava
        // String fileContentsStr = new
        // String(ByteStreams.toByteArray(bis),Charsets.UTF_8);
        // close the input stream.
        bis.close();
        return fileContentsStr;
      } else {
       continue;
      }
    }
  } catch (IOException e) {
   logger.error("IOError :" + e);
   e.printStackTrace();
  }
  return null;
}