为什么Files.probeContentType返回null [英] why does Files.probeContentType return null

问题描述

我在mac上使用java se7，oracle预览。

i am using java se7 on mac, the oracle preview.

我的问题是Files.probeContentType返回null ...它是否有可能到期到了se7的早期状态为mac？
我的代码：

My problem is that "Files.probeContentType" returns null...is it possible that its due to the early status of se7 for mac? My code:

if(directory == null) return;
String content = null;
try {
    content = Files.probeContentType(directory.toPath());
} catch (IOException e) {
    JOptionPane.showMessageDialog(main, e.toString());
    return;
}
if(content == null)
{
    return;
}
else if(content.contains("image"))
{
    main.pctviewer.setImage(directory);
}

文件名是：

/ Users / admin / Desktop / temp / q12 / formulare / Bildschirmfoto 2012-09-11 um 17.57.59.png

"/Users/admin/Desktop/temp/q12/formulare/Bildschirmfoto 2012-09-11 um 17.57.59.png"

in eclipse中的调试模式，如果我将鼠标悬停在文件文件路径= Unis-path（id：145）上面为红色

and in debug mode in eclipse if i hover above File "file path = Unis-path(id:145)" is red

推荐答案

我已经再次向oracle报告了这个bug，希望他们能够向后移动jdk8解决方案（我没有太多希望，但你永远不知道）。

I have reported the bug to oracle again, hoping they will backport the jdk8 solution (I don't have much hope but you never know).

在此期间你可以使用我自己的FileTypeDetector的backport可以在 https://github.com/jeantil/jdk7-mimeutils 上找到maven项目打包到jar，可以添加到类路径以启用mime类型检测。我还提供了一个mime.types文件放在您的主文件夹中，以便检测正常工作。我从某个版本的apache中提取了mime.types文件，所以它非常完整。

In the meantime you can use my own backport of the FileTypeDetector available at https://github.com/jeantil/jdk7-mimeutils the maven project packages to a jar which can be added to your classpath to enable mime type detection. I also provide a mime.types file to put in your home folder for the detection to work correctly. I extracted the mime.types file from some version of apache so it's pretty complete.

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