如何使用Java Spark下载文件？

kain64b 发表于 Dev

kain64b

我想编写简单的Rest API进行文件下载。

据我所知，我找不到文档，因为我需要设置mimetype='application/zip'响应时间，但不清楚如何返回流。

更新：这里解析示例代码：

public static void main(String[] args) {
    //setPort(8080);
    get("/hello", (request, responce) -> getFile(request,responce));
}

private static Object getFile(Request request, Response responce) {
    File file = new File("MYFILE");
    responce.raw().setContentType("application/octet-stream");
    responce.raw().setHeader("Content-Disposition","attachment; filename="+file.getName()+".zip");
    try {

        try(ZipOutputStream zipOutputStream = new ZipOutputStream(new BufferedOutputStream(responce.raw().getOutputStream()));
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(file)))
        {
            ZipEntry zipEntry = new ZipEntry(file.getName());

            zipOutputStream.putNextEntry(zipEntry);
            byte[] buffer = new byte[1024];
            int len;
            while ((len = bufferedInputStream.read(buffer)) > 0) {
                zipOutputStream.write(buffer,0,len);
            }
        }
    } catch (Exception e) {
        halt(405,"server error");
    }

    return null;

an3m0na

您需要的与此线程类似。您只需要关闭OutputStream并返回原始HTTPServletResponse：

try {
    ...
    zipOutputStream.flush();
    zipOutputStream.close();
} catch (Exception e) {
    halt(405,"server error");
}
return responce.raw();

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