读写二进制文件

        不同于文本文件的读写，二进制文件的读写需要其他指令

• DataInputStream类

        它是 FileInputStream 在子类，需要与 FileInputStream 类结合使用读取二进制文件

• DataOutputStream类

        它是 FileOutputStream 在子类，需要与 FileOutputStream 类结合使用写二进制文件

• 举例

public class TestDataStream {
    public static void main(String[] args) {
        String readPath = "D:\a\Hello.class";
        String writePath = "D:\b\Hello.class";
        DataInputStream inputStream = null;
        DataOutputStream outputStream = null;
        try {
            inputStream = new DataInputStream(new FileInputStream(readPath));
            outputStream = new DataOutputStream(new FileOutputStream(writePath));

            // 读, 写
            int read = 0;
            while (true) {
                read = inputStream.read();
                if (read == -1) {
                    break;
                }
                outputStream.write(read);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}