Java IO流 系统找不到指定的文件

话不多说 直接上代码

//main方法
public static void main(String[] args) throws IOException {
        String srcpath = "day11_data/img/cropped-1920-1080-1012576.jpg";
        String dppath = "day11_data/d/bbb.jpg";

       copyFile(srcpath, dppath);
        //copyFileByArray(srcpath,dppath);
    }

//copyFile方法
public static void copyFile(String srcPath, String dpPath) throws IOException {
        //准备流
        FileOutputStream fos = new FileOutputStream(srcPath);
        FileInputStream fis = new FileInputStream(dpPath);

        int b;
        while ((b = fis.read()) != -1) {
            fos.write(b);
            //System.out.println(b);
        }

        fos.close();
        fis.close();
    }

    public static void copyFileByArray(String srcPath, String destPath) throws IOException {
        //准备流
        FileInputStream fis = new FileInputStream(srcPath);
        FileOutputStream fos = new FileOutputStream(destPath);

        long l = System.currentTimeMillis();
        //输入
        int len;
        byte[] bytes = new byte[1024];
        while ((len = fis.read(bytes)) != -1) {
            //输出
            fos.write(bytes, 0, len);
        }

        //关闭流
        fos.close();
        fis.close();
        long l2 = System.currentTimeMillis();
        System.out.println("复制图片用了" + (l2 - l) + "毫秒");
    }

//报错
Exception in thread "main" java.io.FileNotFoundException: day11_data\d\bbb.jpg (系统找不到指定的文件。)

原因是输入流与输出流的路径写反了

		FileOutputStream fos = new FileOutputStream(srcPath);
        FileInputStream fis = new FileInputStream(dpPath);

这里,输入流应该是srcPath,输出流是dpPath,调换一下就可以解决这个问题了.