在java中确定文件的mime类型的最佳方法？ [英] Best way to determine mime type of a file in java?

问题描述

很奇怪Java中获取mime类型文件的最佳方式。它应该实际检查文件，因为文件名不是一个准确的指标。

Curious what the best way is in Java to get the mime-type of a file. It should actually inspect the file because filenames aren't an accurate indicator.

目前我正在使用以下似乎非常受欢迎或错过

Currently I'm using the following which seems to be very hit or miss

  is = new BufferedInputStream(new FileInputStream(fileName));
  String mimeType = URLConnection.guessContentTypeFromStream(is);
  if(mimeType == null) {
    throw new IOException("can't get mime type of image");
  }

推荐答案

URLConnection＃ guessContentTypeFromStream（） 或 ... FromName（） 确实是标准Java SE API中最好的。然而，像 jMimeMagic 这样的第三方图书馆比 URLConnection＃更好地工作guessXXX（） methods。

The URLConnection#guessContentTypeFromStream() or ...FromName() is indeed the best what you can get in the standard Java SE API. There are however 3rd party libraries like jMimeMagic which does its work better than URLConnection#guessXXX() methods.

String mimeType = Magic.getMagicMatch(file, false).getMimeType();

这支持更广泛的mime类型。

This supports a more wide range of mime types.

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