java合并多个文件的两种方法

public static boolean mergeFiles(String[] fpaths, String resultPath) {
  if (fpaths == null || fpaths.length < 1 || TextUtils.isEmpty(resultPath)) {
    return false;
  }
  if (fpaths.length == 1) {
    return new File(fpaths[0]).renameTo(new File(resultPath));
  }
 
  File[] files = new File[fpaths.length];
  for (int i = 0; i < fpaths.length; i ++) {
    files[i] = new File(fpaths[i]);
    if (TextUtils.isEmpty(fpaths[i]) || !files[i].exists() || !files[i].isFile()) {
      return false;
    }
  }
 
  File resultFile = new File(resultPath);
 
  try {
    int bufSize = 1024;
    BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(resultFile));
    byte[] buffer = new byte[bufSize];
 
    for (int i = 0; i < fpaths.length; i ++) {
      BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(files[i]));
      int readcount;
      while ((readcount = inputStream.read(buffer)) > 0) {
        outputStream.write(buffer, 0, readcount);
      }
      inputStream.close();
    }
    outputStream.close();
  } catch (FileNotFoundException e) {
    e.printStackTrace();
    return false;
  } catch (IOException e) {
    e.printStackTrace();
    return false;
  }
 
  for (int i = 0; i < fpaths.length; i ++) {
    files[i].delete();
  }
 
  return true;
}

public static boolean mergeFiles(String[] fpaths, String resultPath) {
  if (fpaths == null || fpaths.length < 1 || TextUtils.isEmpty(resultPath)) {
    return false;
  }
  if (fpaths.length == 1) {
    return new File(fpaths[0]).renameTo(new File(resultPath));
  }
 
  File[] files = new File[fpaths.length];
  for (int i = 0; i < fpaths.length; i ++) {
    files[i] = new File(fpaths[i]);
    if (TextUtils.isEmpty(fpaths[i]) || !files[i].exists() || !files[i].isFile()) {
      return false;
    }
  }
 
  File resultFile = new File(resultPath);
 
  try {
    FileChannel resultFileChannel = new FileOutputStream(resultFile, true).getChannel();
    for (int i = 0; i < fpaths.length; i ++) {
      FileChannel blk = new FileInputStream(files[i]).getChannel();
      resultFileChannel.transferFrom(blk, resultFileChannel.size(), blk.size());
      blk.close();
    }
    resultFileChannel.close();
  } catch (FileNotFoundException e) {
    e.printStackTrace();
    return false;
  } catch (IOException e) {
    e.printStackTrace();
    return false;
  }
 
  for (int i = 0; i < fpaths.length; i ++) {
    files[i].delete();
  }
 
  return true;
}