文件输入输出处理(五)-DataInputStream,DataOutputStream

1、实例化

DataInputStream(InputStream in)	参数是一个字节输入流
DataOutputStream(OutputStream out)	参数是一个字节输出流

演示

DataInputStream dis = new DataInputStream(new FileInputStream("D:/test/girl.jpg"));
DataOutputStream dos = new DataOutputStream(new FileOutputStream("D:/test/girl2.jpg"));

2、举例

复制图片

 try(
  DataInputStream dis = new DataInputStream(new FileInputStream("D:/test/girl.jpg"));
  DataOutputStream dos = new DataOutputStream(new FileOutputStream("D:/test/girl2.jpg"));
 ){	

     //字符缓冲区
     byte[] bytes = new byte[10];

     //读取长度
     int hasread = 0;

     while((hasread = dis.read(bytes))>0){
         dos.write(bytes,0,hasread);
     }

     //刷新缓冲区
     dos.flush();

     System.out.println("图片复制成功");

 }catch (Exception e){
     e.printStackTrace();
 }