java 7中可以判断文件的contenttype了

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java 7中可以判断文件的contenttype了,例子如下:

   Path path = Paths.get("D:/Downloads/java.txt");

        String contentType = null;

        try {

            contentType = Files.probeContentType(path);

        } catch (IOException e) {

      

            e.printStackTrace();

        }

        System.out.println("File content type is : " + contentType);

         

    }

  就是使用Files.probeContentType方法了.