Java使用RandomAccessFile读写字节文件

RandomAccessFile rf=new RandomAccessFile("c:\\a.jpg","rw");

         // 定位读取的位置

        rf.seek(1230);

        System.out.println(rf.length());

        

        RandomAccessFile currentPart = new RandomAccessFile("c:\\www.jpg", "rw");

        // 定位写入的位置

        currentPart.seek(1230);

        byte[] buffer = new byte[1024];

        

        int hasRead = 0;

    

        while ( (hasRead = rf.read(buffer)) != -1)

               

        {

            currentPart.write(buffer, 0, hasRead);

           

        }

        currentPart.close();