java 字节流 复制 图片

package com.wt.bytes;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Collections;

public class CopyImg {
    public static void main(String[] args) {
        try {
            // 1.创建文件输入和文件输出
            FileInputStream fis = new FileInputStream("E:\\data\\1.jpg");
            FileOutputStream fos = new FileOutputStream("E:\\data\\7.jpg");
            byte[] bytes = new byte[1024];
            int len;
            // 2.复制文件
            while ((len=fis.read(bytes))!=-1){
                fos.write(bytes, 0, len);
            }
            // 3.关闭
            fis.close();
            fos.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}