import java.io.FileInputStream;

import java.io.FileOutputStream;

import org.junit.Test;

public class JavaIO {

    @Test

    public void test() throws Exception{

        //1、输入输出路径

        String inputPath = "C:\\Users\\zwx474555\\Desktop\\E04D24C1-BB2F-424A-AD2D-7B770C96F9A1.png";  //图片路径

        String outPath = "F:\\123.png";  //复制路径及文件名

        //2、输入输出流对象

        FileInputStream fis = new FileInputStream(inputPath);

        FileOutputStream fos = new FileOutputStream(outPath);

        //3、声明字节数组，每次按1K读取，按1K输出

        byte[] bytes = new byte[1024];

        int temp = 0;

        while((temp = fis.read(bytes)) != -1){

            fos.write(bytes, 0, temp); //一边读取，一边输出

        }

        //4、刷新输出流

        fos.flush();

        //5、关闭流

        fis.close();

        fos.close();

    }

}