代码大致上是这个样子:
DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(文件路径)));
byte[] bs = new byte[in.available()];
in.read(bs);
in.close();
DataOutputStream os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(文件输出路径)));
os.write(bs);
os.flush();
os.close();