Java Mime Type Get getMimeType(File file)

Description

Try to detect MimeType by backwards compatible methods

License

Apache License

Declaration

public static String getMimeType(File file) 

Method Source Code

//package com.java2s;
/*#######################################################
 *
 *   Maintained by Gregor Santner, 2017-
 *   https://gsantner.net//* w  w w.  j  a  v  a2s . c om*/
 *
 *   License: Apache 2.0
 *  https://github.com/gsantner/opoc/#licensing
 *  https://www.apache.org/licenses/LICENSE-2.0
 *
#########################################################*/

import java.io.BufferedInputStream;

import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;
import java.io.InputStream;

import java.net.URLConnection;

public class Main {
    /**
     * Try to detect MimeType by backwards compatible methods
     */
    public static String getMimeType(File file) {
        String guess = null;
        if (file != null && file.exists() && file.isFile()) {
            InputStream is = null;
            try {
                is = new BufferedInputStream(new FileInputStream(file));
                guess = URLConnection.guessContentTypeFromStream(is);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (is != null) {
                    try {
                        is.close();
                    } catch (IOException ignored) {
                    }
                }
            }

            if (guess == null || guess.isEmpty()) {
                guess = "*/*";
                int dot = file.getName().lastIndexOf(".") + 1;
                if (dot > 0 && dot < file.getName().length()) {
                    switch (file.getName().substring(dot)) {
                    case "md":
                    case "markdown":
                    case "mkd":
                    case "mdown":
                    case "mkdn":
                    case "mdwn":
                    case "rmd":
                        guess = "text/markdown";
                        break;
                    case "txt":
                        guess = "text/plain";
                        break;
                    }
                }
            }
        }
        return guess;
    }
}

Related

1. extractMimeType(byte[] imageData)
2. getExactMimeType(String fileName)
3. getMimeType(String file)
4. getMimeType(String fileName)
5. getMIMEType(String fileName)
6. getMimeType(String fileName)