如何在不知道文件扩展名的情况下获取图像类型？ [英] How to get an image type without knowing its file extension?

问题描述

我需要知道没有文件扩展名的文件扩展名？这是否可以使用java IO API？

I need to know a file extension without having the file extension? Is this possible with the java IO API?

我在读取JPG文件时遇到以下异常：

I'm getting the following exception while reading a JPG file:

javax.imageio.IIOException: Unsupported Image Type

任何人有任何想法如何解决这个问题？

Does anyone have any ideas how to solve this?

当我尝试在Mac OS X或Windows中的普通图像查看器中打开图像时，它的工作正常。

When i try to open the image in a normal image viewer in Mac OS X or Windows, it works just fine.

是否有可能将文件重命名为其他类型且原始类型与扩展名不同？

Is there any chances the file was renamed to a different type and it's original type is different from the extension?

推荐答案

您可以使用此代码获取mime类型。

You can get the mime type with this code.

String imageName = "C:\\Documents and Settings\\home\\Desktop\\P092870.jpg";
File input = new File(imageName);
System.out.println("System Type description of " + input.getName() + " is " + 
          FileSystemView.getFileSystemView().getSystemTypeDescription(input));
System.out.println("Mime Type of " + input.getName() + " is " +
          new MimetypesFileTypeMap().getContentType(input));

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