字节流实现文件复制

package cn.hp.字节流_图片;

import java.io.*;

public class Demo8 {
    public static void main(String[] args) {
        //获取要上传的文件路径
        String copy = "A:\U盘\大三\软件\idea激活\intellij idea.emmx";
        //目的地路径
        String paste = "D:\AAA";
        //通过File获取目的地路径
        File file =new File (paste);
        //判断目的地路径是否存在，不存在则创建
        if (!file.mkdirs()) {
            file.mkdirs();
        }
        
        String fileName = paste+File.separator+System.currentTimeMillis()+copy.substring(copy.lastIndexOf("."));
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            //输入流
            inputStream=new FileInputStream(copy);
            //输出流
            outputStream = new FileOutputStream(fileName);
            byte [] b = new byte[1024];
            int len=0;
            while ((len=inputStream.read(b))!=-1){
                outputStream.write(b,0,len);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                inputStream.close();
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}