用缓冲流复制文件（Java）

 相比于字节流更快

package com.hncu.myfiledemo;

import java.io.*;

public class Demo6 {
    //缓冲流字节实现文件复制
    public static void main(String[] args) throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("F:\\picture\\picture.jpg"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("myfile\\picture.jpg"));
        int b;
        while ((b = bis.read()) != -1){
            bos.write(b);
        }
        bis.close();
        bos.close();
    }
}

package com.hncu.myfiledemo;

import java.io.*;

public class Demo7 {
    //缓冲流数组实现复制文件
    public static void main(String[] args) throws IOException {
        //缓冲流底层有一个默认长度文8192的数组
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("F:\\picture\\picture.jpg"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("myfile\\picture.jpg"));
        //数组内容传给缓冲流数组
        byte[] bytes = new byte[1024];
        int len;//记录缓冲流数组长度
        while ((len = bis.read(bytes))!=-1){
            bos.write(bytes,0,len);
        }
        bis.close();
        bos.close();
    }
}