博客

1. 文件拷贝主要涉及对象

• Channel： 相当于传统IO中流
• Buffer
  
  

2. 具体实现代码

public class NioFileCopy {
    public static void main(String[] args) throws Exception {
        //文件名
        String src = "d:\\file.pdf";
        String des = "d:\\file1.pdf";
        //读文件channel
        FileInputStream fileInputStream = new FileInputStream(src);
        FileChannel inChannel = fileInputStream.getChannel();
       //写文件channel
        FileOutputStream fileOutputStream = new FileOutputStream(des);
        FileChannel outChannel = fileOutputStream.getChannel();
        //定义Buffer
        ByteBuffer byteBuffer = ByteBuffer.allocate(512);

        //开始拷贝
        while(inChannel.read(byteBuffer) != -1) {
            //转换position方向
            byteBuffer.flip();
            outChannel.write(byteBuffer);
            //转换position方向
            byteBuffer.flip();
        }

    }
}