Files.probeContentType的替代？ [英] Alternative to Files.probeContentType?

问题描述

在一个Web项目中，用户上传他们的文件，但是当我在服务器上收到它们时，它们被存储为.tmp文件而不是原始文件扩展名（这也是我的首选行为）。

In a web project, users upload their files, but when I receive them on the server, they are being stored as .tmp files rather than their original file extension (this is my preferred behavior as well).

但是，这会导致 Files.probeContentType（）出现问题。虽然本地对我来说，在我的Linux开发机器上，当我将项目上传到生产服务器时， Files.probeContentType（）正常工作并确定正确的mime类型beanstalk），它似乎没有正确确定mime类型。

However, this is causing a problem with Files.probeContentType(). While locally for me, on my Linux dev machine, Files.probeContentType() works correctly and does determine the right mime type, when I upload my project to the production server (amazon beanstalk), it doesn't seem to correctly determine the mime type.

从阅读javadocs，似乎 Files.probeContentType的实现（）是不同的，我认为在生产服务器上，它正在读取文件扩展名，因此无法确定内容类型。

From reading the javadocs, it seems that the implementation of Files.probeContentType() are different, and I think that on production server, it is reading the file extension and so, is unable to determine the content type.

什么是 Files.probeContentType（）的一个好的，快速的替代品，它将接受文件参数并返回一个字符串如 image / png 作为生成的mime类型？

What's a good, and quick alternative to Files.probeContentType() which will accept a File argument and return a string like image/png as the resulting mime type?

推荐答案

Take看一下 Apache Tika 。它可以很容易地确定一个mime类型：

Take a look at the Apache Tika. It can easily determine a mime type:

 Tika tika = new Tika();
 File file = ...
 String mimeType = tika.detect(file);

这是一个最小的所需maven依赖：

Here's a minimal required maven dependency:

 <dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-core</artifactId>
    <version>1.12</version>
 </dependency>

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