Java response.setContentType("APPLICATION/OCTET-STREAM")
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response.setContentType("APPLICATION/OCTET-STREAM")
提问by Tarun Bhatt
I have a very basic question:
我有一个非常基本的问题：
I am writing code to download a CSV file using JSP & Servlets. I got the code from internet forums and it is working fine, but I am trying to understand the significance of the two following lines
我正在编写代码以使用 JSP 和 Servlet 下载 CSV 文件。我从互联网论坛上得到了代码，它运行良好，但我试图理解以下两行的重要性
response.setContentType("APPLICATION/OCTET-STREAM");
response.setHeader("Content-Disposition", "attachment; filename=\""
+ filename + "\"");
Now the first line response.setContentType- According to my understanding it tells the browser what kind of data is expected from the server. My question is what does it tell the browser with value application/octet-stream. I see this being used for downloading all kinds of files. If this lines informs the browser that page would download a file, what difference is the next line causing. response.setHeaderis having attachment as a parameter.
现在第一行response.setContentType- 根据我的理解，它告诉浏览器期望来自服务器的数据类型。我的问题是它用 value 告诉浏览器什么application/octet-stream。我看到这被用于下载各种文件。如果此行通知浏览器该页面将下载文件，那么下一行导致. response.setHeader将附件作为参数。
Can anyone tell me the significance of these 2 lines for file download?
谁能告诉我这两行文件下载的重要性？
Regards Tarun
问候塔伦
采纳答案by Christian Kuetbach
The first line describes the datatype.
第一行描述数据类型。
response.setContentType("APPLICATION/OCTET-STREAM");
APPLICATION/OCTET-STREAMstands for binary data. It may be more precise by specifing the actual filetype. For images it coud be image/png. If the browser knows the exact filetype it may show the file directly.
APPLICATION/OCTET-STREAM代表二进制数据。通过指定实际的文件类型可能会更精确。对于图像，它可以是image/png。如果浏览器知道确切的文件类型，它可能会直接显示文件。
response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
This says "Don't even try to show the file, just save the file." It also suggests a filename.
这表示“甚至不要尝试显示文件，只需保存文件。” 它还建议一个文件名。
updateThere is a better explaination of mime-types and content-disposition at wikipedia:
更新维基百科对 mime-types 和 content-disposition 有更好的解释：
