相关疑难解决方法(0)

我正在为程序添加一些功能,以便我可以通过读取MIME数据来准确地确定文件类型.我已经尝试过几种方法:

方法1:

javax.activation.FileDataSource

FileDataSource ds = new FileDataSource("~\\Downloads\\777135_new.xls");  
String contentType = ds.getContentType();  
System.out.println("The MIME type of the file is: " + contentType);

//output = The MIME type of the file is: application/octet-stream

方法2:

import net.sf.jmimemagic.*;

try
{
    RandomAccessFile f = new RandomAccessFile("~\\Downloads\\777135_new.xls", "r");
    byte[] fileBytes = new byte[(int)f.length()];
    f.read(fileBytes);
    MagicMatch match = Magic.getMagicMatch(fileBytes);
    System.out.println("The Mime type is: " + match.getMimeType());
}
catch(Exception e)
{
    System.out.println(e);
}

//output = The Mime type is: application/msword

方法3:

import eu.medsea.mimeutil.*;

MimeUtil.registerMimeDetector("eu.medsea.mimeutil.detector.MagicMimeMimeDetector");
File f = …