在java中设置内容类型以进行文件下载
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setting content type in java for file download
提问by coder247
In my application i like to provide file download facility. I set the file types to response.setContentType. How can I set the content types for almost all known file types? Is there any easy way? or I need to set it manually like i do now, which is given below.
在我的应用程序中，我喜欢提供文件下载工具。我将文件类型设置为 response.setContentType。如何为几乎所有已知文件类型设置内容类型？有什么简便的方法吗？或者我需要像现在一样手动设置它，如下所示。
if (pictureName.indexOf("jpg") > 0) {
res.setContentType("image/jpg");
} else if (pictureName.indexOf("gif") > 0) {
res.setContentType("image/gif");
} else if (pictureName.indexOf("pdf") > 0) {
res.setContentType("application/pdf");
res.setHeader("Content-Disposition", "inline; filename=\"" + pictureName + "\"");
} else if (pictureName.indexOf("html") > 0) {
res.setContentType("text/html");
} else if (pictureName.indexOf("zip") > 0) {
res.setContentType("application/zip");
res.setHeader("Content-Disposition", "attachment; filename=\"" + pictureName + "\"");
}
Thanks :)
谢谢 ：）
采纳答案by skaffman
Take a look at javax.activation.MimetypesFileTypeMap(comes as part of Java6, can be downloaded for prior version). It has a method that returns the mime type for a given filename.
看看javax.activation.MimetypesFileTypeMap（作为 Java6 的一部分，可以下载以前的版本）。它有一个方法可以返回给定文件名的 MIME 类型。
I've never tried using it myself, though, and it's possible you'll still need to supply it with a list of mime types. Worth a look, though.
不过，我自己从未尝试过使用它，而且您可能仍需要为它提供一个 mime 类型列表。不过值得一看。
回答by Ray Hulha
URLConnection.getFileNameMap().getContentTypeFor(string)works for txt, pdf, avi; fails for doc, odt, mp3...
URLConnection.getFileNameMap().getContentTypeFor(string)适用于 txt、pdf、avi；doc、odt、mp3 失败...
回答by Doug
To giving a working example of what @skaffman listed when using a Servlet:
给出一个使用 Servlet 时 @skaffman 列出的工作示例：
String fileName = "c:/temp/URL.txt";
MimetypesFileTypeMap mimetypesFileTypeMap=new MimetypesFileTypeMap();
response.setContentType(mimetypesFileTypeMap.getContentType(fileName));
response.getOutputStream().write(Files.readAllBytes(Paths.get(fileName)));
