字节流

字节输出流

public void writeFile() throws Exception{
      Scanner input = new Scanner(System.in);
      //将文件封装为File对象
      File file = new File("X:\\xxx.xxx");
      //输出数据
      String str = input.next();
      //字节输出流
      FileOutputStream fos = new FileOutputStream(file,true);
      //将代码数据保存到磁盘
      fos.write(str.getBytes());
      //关闭流
      fos.close();
}

字节输入流

public void readFile() throws Exception{
     //将文件封装为File对象
     File file = new File("X:\\xxx.xxx");
     建立磁盘通向程序代码的管道(字节输入流)
     FileInputStream fis = new FileInputStream(file);
     int len = 0;
     //读取数据
     while((len = fis.read()) != -1){
         System.out.print((char)len);
     }
     //关闭流
     fis.close();
}

(缓冲流)文件的复制

public void copyVideoQuik() throws Exception{
      //磁盘通往代码的管道
      FileInputStream fis = new FileInputSteam("X:\\xxx.xxx");
      //管道加粗
      BufferedInputSteam bis = new BufferedInputSteam(fis);
      //代码通往磁盘的管道
      FileOutputStream fos = new FileOutputStream("X:\\xxx.xxx");
      //管道加粗
      BufferedOutputStream bos = new BufferedOutputStream(fos);
      byte[] car = new byte[1024];//一次读取1024字节(速度最优)
      int len = 0;//len=-1代表读取结束
      while((len = bis.read(car)) != -1){
          //读取的数据保存到磁盘
         bos.write(car,0,len);//从car里读取，从下标0开始，读1024个
         //System.out.println(new String(car,0,len));//转字符串逐行打印
      }
      //关闭流：先关外管道流，再关内管道流
      //关输入流
      bis.close();
      fis.close();
      //关输出流
      bos.close();
      fos.close();
}