Java IO--字节流复制图片实例

字节流用来操作图片、视屏、音频（进制文件）

package learn;

import java.io.*;

public class Learn{
    public static void main(String[] args) throws IOException {
        File file1=new File("D:/a.jpg");
        File file2=new File("D:/b.jpg");
        byte[] b=new byte[(int)file1.length()];
        FileInputStream in=null;
        FileOutputStream out=null;
        try {
            in=new FileInputStream(file1);
            out=new FileOutputStream(file2);//没有指定文件则会创建
            while(in.read(b)!=-1){        //read()--int，-1表示读取完毕
                out.write(b);
            }
            out.flush();
            in.close();
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}