java处理多文件合并

private static boolean combine(String outFile, List inFiles) throws Exception{

    File[] files = new File[inFiles.size()];
    for(int i = 0; i < files.length; i++){
        files[i] = new File(inFiles.get(i));
    }
    FileInputStream fis = null;
    FileOutputStream fos = new FileOutputStream(outFile, true);//合并其实就是文件的续写,写成true
    for (int i = 0; i < files.length; i++){
        fis = new FileInputStream(files[i]);
        int len = 0;
        for (byte[] buf = new byte[1024 * 1024]; (len = fis.read(buf)) != -1;){
            fos.write(buf, 0, len);
        }
        fis.close();
    }
    fos.close();
    return true;
}