将网站放在阿里云上，之后点击图片下载，图片下载在阿里云的D盘上，如何才能让图片下载到用户的电脑上？

Question

将网站放在阿里云上，之后点击图片下载，图片下载在阿里云的D盘上，如何才能让图片下载到用户的电脑上？

部分代码如下：

String savePath = "D:\upload\";
File downloadFile1 = new File(savePath);
if (!downloadFile1.exists()) {
downloadFile1.mkdirs();
}
File file1 = new File(savePath + "\" + filename + "." + format);
if (!ImageIO.write(image, format, file1)) {
throw new IOException("Could not write an image of format " + format + " to " + file1);
}

Answer 1

可以使用流写到本地，类似下面这样

byte[] buff = new byte[1024];
BufferedInputStream bis = null;
OutputStream os = null;
try {
    os = resp.getOutputStream();
    bis = new BufferedInputStream(new FileInputStream(file1));
    int i = 0;
    while ((i = bis.read(buff)) != -1) {
        os.write(buff, 0, i);
        os.flush();
    }
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        bis.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}