java处理多文件合并

private static boolean combine(String outFile, List<String> 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;
    }