import edu.stanford.nlp.util.ByteStreamGobbler; //导入依赖的package包/类
public BZip2PipedOutputStream(String filename, OutputStream err) throws IOException {
  String bzip2 = System.getProperty("bzip2", "bzip2");
  String cmd = bzip2; // + " > " + filename;
  //System.err.println("getBZip2PipedOutputStream: Running command: "+cmd);
  ProcessBuilder pb = new ProcessBuilder();
  pb.command(cmd);
  this.process = pb.start();
  this.filename = filename;
  OutputStream outStream = new FileOutputStream(filename);
  errWriter = new PrintWriter(new BufferedWriter(new OutputStreamWriter(err)));
  outGobbler = new ByteStreamGobbler("Output stream gobbler: " + cmd + " " + filename,
          process.getInputStream(), outStream);
  errGobbler = new StreamGobbler(process.getErrorStream(), errWriter);
  outGobbler.start();
  errGobbler.start();
}