如何发送文件到浏览器下载？ [英] How to send a file to browser for downloading?

问题描述

当客户端请求文件时，我使用这个代码发送：

When client request for a file, I use this code to send it:

public static Result download(String file) {
    File file = getRealFile(file);
    return Ok(file);
}

但是我发现浏览器不会下载，而是显示其内容。响应标题：

But I found the browser will not download it, but display its content instead. The response header:

Content-Type    text/plain
Transfer-Encoding   chunked

发送文件的方式是什么？

What's the correct way to send a file?

更新

根据Razvi的回答，我发现一个答案似乎对这个问题很好：https://stackoverflow.com/a/1074925/342235

Per Razvi's answer, I found an answer seems good for this question: https://stackoverflow.com/a/1074925/342235

但是我们真的有设置如此多的标题？

But do we really have to set so many headers?

header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=$filepath");
header("Content-Type: mime/type");
header("Content-Transfer-Encoding: binary");
// UPDATE: Add the below line to show file size during download.
header('Content-Length: ' . filesize($filepath));

推荐答案

您需要设置Content-Disposition标题。我相信标题的值应该是附件。请参阅操作回复文档。

You need to set the Content-Disposition header. I believe the value of the header should be attachment. See Manipulating the response doc for this.

对于play 2.0，以下工作没有明确设置标题：

For play 2.0 the following works without explicitly setting the header:

ok（new FileInputStream（file））

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