I have been using this piece of code for a long time to get the mime type of the file
FileNameMap fileNameMap = URLConnection.getFileNameMap();
String type = fileNameMap.getContentTypeFor(fileName);
Today, I found out that sometimes it returns null and throws an null error exception. Since there is no other option I had to come up with a class.
import java.io.File;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
public class MimeTypes {
private static final Map<String, String> EXT2MIME = new HashMap<String, String>();
private static final Map<String, String> MIME2EXT = new HashMap<String, String>();
private MimeTypes() {
}
static {
// extension to MIME type
EXT2MIME.put("", "application/octet-stream");
EXT2MIME.put("ai", "application/postscript");
EXT2MIME.put("aif", "audio/x-aiff");
EXT2MIME.put("aifc", "audio/x-aiff");
EXT2MIME.put("aiff", "audio/x-aiff");
EXT2MIME.put("asf", "video/x-ms-asf");
EXT2MIME.put("asr", "video/x-ms-asf");
EXT2MIME.put("asx", "video/x-ms-asf");
EXT2MIME.put("au", "audio/basic");
EXT2MIME.put("avi", "video/x-msvideo");
EXT2MIME.put("axs", "application/olescript");
EXT2MIME.put("bas", "text/plain");
EXT2MIME.put("bmp", "image/bmp");
EXT2MIME.put("c", "text/plain");
EXT2MIME.put("cat", "application/vnd.ms-pkiseccat");
EXT2MIME.put("cdf", "application/x-cdf");
EXT2MIME.put("cer", "application/x-x509-ca-cert");
EXT2MIME.put("class", "application/java-vm");
EXT2MIME.put("clp", "application/x-msclip");
EXT2MIME.put("cmx", "image/x-cmx");
EXT2MIME.put("cod", "image/cis-cod");
EXT2MIME.put("cpio", "application/x-cpio");
EXT2MIME.put("crd", "application/x-mscardfile");
EXT2MIME.put("crl", "application/pkix-crl");
EXT2MIME.put("crt", "application/x-x509-ca-cert");
EXT2MIME.put("csh", "application/x-csh");
EXT2MIME.put("css", "text/css");
EXT2MIME.put("dll", "application/x-msdownload");
EXT2MIME.put("doc", "application/msword");
EXT2MIME.put("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document");
EXT2MIME.put("doct", "application/vnd.openxmlformats-officedocument.wordprocessingml.template");
EXT2MIME.put("dot", "application/msword");
EXT2MIME.put("dvi", "application/x-dvi");
EXT2MIME.put("dxr", "application/x-director");
EXT2MIME.put("eps", "application/postscript");
EXT2MIME.put("epub", "application/epub+zip");
EXT2MIME.put("etx", "text/x-setext");
EXT2MIME.put("evy", "application/envoy");
EXT2MIME.put("flac", "audio/flac");
EXT2MIME.put("fif", "application/fractals");
EXT2MIME.put("flr", "x-world/x-vrml");
EXT2MIME.put("gif", "image/gif");
EXT2MIME.put("gtar", "application/x-gtar");
EXT2MIME.put("gz", "application/x-gzip");
EXT2MIME.put("h", "text/plain");
EXT2MIME.put("hdf", "application/x-hdf");
EXT2MIME.put("hlp", "application/winhlp");
EXT2MIME.put("hqx", "application/mac-binhex40");
EXT2MIME.put("hta", "application/hta");
EXT2MIME.put("htc", "text/x-component");
EXT2MIME.put("htm", "text/html");
EXT2MIME.put("html", "text/html");
EXT2MIME.put("htt", "text/webviewhtml");
EXT2MIME.put("ico", "image/x-icon");
EXT2MIME.put("ief", "image/ief");
EXT2MIME.put("iii", "application/x-iphone");
EXT2MIME.put("isp", "application/x-internet-signup");
EXT2MIME.put("jar", "application/java-archive");
EXT2MIME.put("jfif", "image/pipeg");
EXT2MIME.put("jpe", "image/jpeg");
EXT2MIME.put("jpeg", "image/jpeg");
EXT2MIME.put("jpg", "image/jpeg");
EXT2MIME.put("js", "application/x-javascript");
EXT2MIME.put("json", "application/json");
EXT2MIME.put("latex", "application/x-latex");
EXT2MIME.put("lsf", "video/x-la-asf");
EXT2MIME.put("lsx", "video/x-la-asf");
EXT2MIME.put("m3u", "audio/x-mpegurl");
EXT2MIME.put("man", "application/x-troff-man");
EXT2MIME.put("mdb", "application/x-msaccess");
EXT2MIME.put("me", "application/x-troff-me");
EXT2MIME.put("mhtv", "message/rfc822");
EXT2MIME.put("mhtml", "message/rfc822");
EXT2MIME.put("mid", "audio/mid");
EXT2MIME.put("mov", "video/quicktime");
EXT2MIME.put("movie", "video/x-sgi-movie");
EXT2MIME.put("mp2", "video/mpeg");
EXT2MIME.put("mp3", "audio/mpeg");
EXT2MIME.put("mpa", "video/mpeg");
EXT2MIME.put("mpe", "video/mpegv");
EXT2MIME.put("mpeg", "video/mpeg");
EXT2MIME.put("mpg", "video/mpegv");
EXT2MIME.put("mpp", "application/vnd.ms-project");
EXT2MIME.put("mpv2", "video/mpeg");
EXT2MIME.put("ms", "application/x-troff-ms");
EXT2MIME.put("mvb", "application/x-msmediaview");
EXT2MIME.put("nws", "message/rfc822");
EXT2MIME.put("oda", "application/oda");
EXT2MIME.put("odb", "application/vnd.oasis.opendocument.database");
EXT2MIME.put("odc", "application/vnd.oasis.opendocument.chart");
EXT2MIME.put("odf", "application/vnd.oasis.opendocument.formula");
EXT2MIME.put("odft", "application/vnd.oasis.opendocument.formula-template");
EXT2MIME.put("odg", "application/vnd.oasis.opendocument.graphics");
EXT2MIME.put("odi", "application/vnd.oasis.opendocument.image");
EXT2MIME.put("odm", "application/vnd.oasis.opendocument.text-master");
EXT2MIME.put("odp", "application/vnd.oasis.opendocument.presentation");
EXT2MIME.put("ods", "application/vnd.oasis.opendocument.spreadsheet");
EXT2MIME.put("odt", "application/vnd.oasis.opendocument.text");
EXT2MIME.put("ogg", "audio/ogg");
EXT2MIME.put("ogv", "video/ogg");
EXT2MIME.put("otc", "application/vnd.oasis.opendocument.chart-template");
EXT2MIME.put("otg", "application/vnd.oasis.opendocument.graphics-template");
EXT2MIME.put("oth", "application/vnd.oasis.opendocument.text-web");
EXT2MIME.put("oti", "application/vnd.oasis.opendocument.image-template");
EXT2MIME.put("otp", "application/vnd.oasis.opendocument.presentation-template");
EXT2MIME.put("ots", "application/vnd.oasis.opendocument.spreadsheet-template");
EXT2MIME.put("ott", "application/vnd.oasis.opendocument.text-template");
EXT2MIME.put("p10", "application/pkcs10");
EXT2MIME.put("p12", "application/x-pkcs12v");
EXT2MIME.put("p7b", "application/x-pkcs7-certificates");
EXT2MIME.put("p7c", "application/x-pkcs7-mime");
EXT2MIME.put("p7m", "application/x-pkcs7-mime");
EXT2MIME.put("p7r", "application/x-pkcs7-certreqresp");
EXT2MIME.put("p7s", "application/x-pkcs7-signature");
EXT2MIME.put("pbm", "image/x-portable-bitmap");
EXT2MIME.put("pdf", "application/pdf");
EXT2MIME.put("pfx", "application/x-pkcs12");
EXT2MIME.put("pgm", "image/x-portable-graymap");
EXT2MIME.put("vpko", "application/ynd.ms-pkipko");
EXT2MIME.put("pma", "application/x-perfmon");
EXT2MIME.put("pmc", "application/x-perfmon");
EXT2MIME.put("pml", "application/x-perfmon");
EXT2MIME.put("pmr", "application/x-perfmon");
EXT2MIME.put("pmw", "application/x-perfmon");
EXT2MIME.put("png", "image/png");
EXT2MIME.put("pnm", "image/x-portable-anymap");
EXT2MIME.put("pot", "application/vnd.ms-powerpoint");
EXT2MIME.put("ppm", "image/x-portable-pixmap");
EXT2MIME.put("pps", "application/vnd.ms-powerpoint");
EXT2MIME.put("ppt", "application/vnd.ms-powerpoint");
EXT2MIME.put("pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation");
EXT2MIME.put("ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow");
EXT2MIME.put("potx", "application/vnd.openxmlformats-officedocument.presentationml.template");
EXT2MIME.put("prf", "application/pics-rules");
EXT2MIME.put("ps", "application/postscript");
EXT2MIME.put("pub", "application/x-mspublisher");
EXT2MIME.put("qt", "video/quicktime");
EXT2MIME.put("ra", "audio/x-pn-realaudio");
EXT2MIME.put("ram", "audio/x-pn-realaudio");
EXT2MIME.put("ras", "image/x-cmu-raster");
EXT2MIME.put("rgb", "image/x-rgb");
EXT2MIME.put("rmi", "audio/mid");
EXT2MIME.put("roff", "application/x-troff");
EXT2MIME.put("rtf", "application/rtf");
EXT2MIME.put("rtx", "text/richtext");
EXT2MIME.put("ser", "application/java-serialized-object");
EXT2MIME.put("scd", "application/x-msschedule");
EXT2MIME.put("sct", "text/scriptlet");
EXT2MIME.put("sh", "application/x-sh");
EXT2MIME.put("shar", "application/x-shar");
EXT2MIME.put("sit", "application/x-stuffit");
EXT2MIME.put("snd", "audio/basic");
EXT2MIME.put("spc", "application/x-pkcs7-certificates");
EXT2MIME.put("spl", "application/futuresplash");
EXT2MIME.put("src", "application/x-wais-source");
EXT2MIME.put("sst", "application/vnd.ms-pkicertstore");
EXT2MIME.put("stl", "application/vnd.ms-pkistl");
EXT2MIME.put("stm", "text/html");
EXT2MIME.put("svg", "image/svg+xml");
EXT2MIME.put("swf", "application/x-shockwave-flash");
EXT2MIME.put("t", "application/x-troff");
EXT2MIME.put("tar", "application/x-tar");
EXT2MIME.put("tcl", "application/x-tcl");
EXT2MIME.put("tex", "application/x-tex");
EXT2MIME.put("texi", "application/x-texinfo");
EXT2MIME.put("texinfo", "application/x-texinfo");
EXT2MIME.put("tgz", "application/x-compressed");
EXT2MIME.put("tif", "image/tiff");
EXT2MIME.put("tiff", "image/tiff");
EXT2MIME.put("tr", "application/x-troff");
EXT2MIME.put("trm", "application/x-msterminal");
EXT2MIME.put("tsv", "text/tab-separated-values");
EXT2MIME.put("txt", "text/plain");
EXT2MIME.put("uls", "text/iuls");
EXT2MIME.put("ustar", "application/x-ustar");
EXT2MIME.put("vcf", "text/x-vcard");
EXT2MIME.put("vrml", "x-world/x-vrml");
EXT2MIME.put("wav", "audio/x-wav");
EXT2MIME.put("wcm", "application/vnd.ms-works");
EXT2MIME.put("wdb", "application/vnd.ms-works");
EXT2MIME.put("wmf", "application/x-msmetafile");
EXT2MIME.put("wps", "application/vnd.ms-works");
EXT2MIME.put("wri", "application/x-mswrite");
EXT2MIME.put("wrl", "x-world/x-vrml");
EXT2MIME.put("wrz", "x-world/x-vrml");
EXT2MIME.put("xaf", "x-world/x-vrml");
EXT2MIME.put("xbm", "image/x-xbitmap");
EXT2MIME.put("xla", "application/vnd.ms-excel");
EXT2MIME.put("xlc", "application/vnd.ms-excel");
EXT2MIME.put("xlm", "application/vnd.ms-excel");
EXT2MIME.put("xls", "application/vnd.ms-excel");
EXT2MIME.put("xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
EXT2MIME.put("xlt", "application/vnd.ms-excel");
EXT2MIME.put("xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template");
EXT2MIME.put("xlw", "application/vnd.ms-excel");
EXT2MIME.put("xml", "text/xml");
EXT2MIME.put("xof", "x-world/x-vrml");
EXT2MIME.put("xpm", "image/x-xpixmap");
EXT2MIME.put("xwd", "image/x-xwindowdump");
EXT2MIME.put("z", "application/x-compress");
EXT2MIME.put("zip", "application/zip");
// MIME type to extension
MIME2EXT.put("application/octet-stream", "");
MIME2EXT.put("application/envoy", "evy");
MIME2EXT.put("application/epub+zip", "epub");
MIME2EXT.put("application/fractals", "fif");
MIME2EXT.put("application/futuresplash", "spl");
MIME2EXT.put("application/hta", "hta");
MIME2EXT.put("application/java-archive", "jar");
MIME2EXT.put("application/java-serialized-object", "ser");
MIME2EXT.put("application/java-vm", "class");
MIME2EXT.put("application/javascript", "js");
MIME2EXT.put("application/json", "json");
MIME2EXT.put("application/mac-binhex40", "hqx");
MIME2EXT.put("application/msword", "doc");
MIME2EXT.put("application/oda", "oda");
MIME2EXT.put("application/olescript", "axs");
MIME2EXT.put("application/pdf", "pdf");
MIME2EXT.put("application/pics-rules", "prf");
MIME2EXT.put("application/pkcs10", "p10");
MIME2EXT.put("application/pkix-crl", "crl");
MIME2EXT.put("application/postscript", "ps");
MIME2EXT.put("application/rtf", "rtf");
MIME2EXT.put("application/vnd.ms-excel", "xls");
MIME2EXT.put("application/vnd.ms-pkicertstore", "sst");
MIME2EXT.put("application/vnd.ms-pkiseccat", "cat");
MIME2EXT.put("application/vnd.ms-pkistl", "stl");
MIME2EXT.put("application/vnd.ms-powerpoint", "ppt");
MIME2EXT.put("application/vnd.ms-project", "mpp");
MIME2EXT.put("application/vnd.ms-works", "wps");
MIME2EXT.put("application/vnd.oasis.opendocument.chart", "odc");
MIME2EXT.put("application/vnd.oasis.opendocument.chart-template", "otc");
MIME2EXT.put("application/vnd.oasis.opendocument.database", "odb");
MIME2EXT.put("application/vnd.oasis.opendocument.formula", "odf");
MIME2EXT.put("application/vnd.oasis.opendocument.formula-template", "odft");
MIME2EXT.put("application/vnd.oasis.opendocument.graphics", "odg");
MIME2EXT.put("application/vnd.oasis.opendocument.graphics-template", "otg");
MIME2EXT.put("application/vnd.oasis.opendocument.image", "odi");
MIME2EXT.put("application/vnd.oasis.opendocument.image-template", "oti");
MIME2EXT.put("application/vnd.oasis.opendocument.presentation", "odp");
MIME2EXT.put("application/vnd.oasis.opendocument.presentation-template", "otp");
MIME2EXT.put("application/vnd.oasis.opendocument.spreadsheet", "ods");
MIME2EXT.put("application/vnd.oasis.opendocument.spreadsheet-template", "ots");
MIME2EXT.put("application/vnd.oasis.opendocument.text", "odt");
MIME2EXT.put("application/vnd.oasis.opendocument.text-master", "odm");
MIME2EXT.put("application/vnd.oasis.opendocument.text-template", "ott");
MIME2EXT.put("application/vnd.oasis.opendocument.text-web", "oth");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.presentationml.template", "potx");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx");
MIME2EXT.put("application/winhlp", "hlp");
MIME2EXT.put("application/x-cdf", "cdf");
MIME2EXT.put("application/x-compress", "z");
MIME2EXT.put("application/x-compressed", "tgz");
MIME2EXT.put("application/x-cpio", "cpio");
MIME2EXT.put("application/x-csh", "csh");
MIME2EXT.put("application/x-director", "dxr");
MIME2EXT.put("application/x-dvi", "dvi");
MIME2EXT.put("application/x-gtar", "gtar");
MIME2EXT.put("application/x-gzip", "gz");
MIME2EXT.put("application/x-hdf", "hdf");
MIME2EXT.put("application/x-internet-signup", "isp");
MIME2EXT.put("application/x-iphone", "iii");
MIME2EXT.put("application/x-javascript", "js");
MIME2EXT.put("application/x-latex", "latex");
MIME2EXT.put("application/x-msaccess", "mdb");
MIME2EXT.put("application/x-mscardfile", "crd");
MIME2EXT.put("application/x-msclip", "clp");
MIME2EXT.put("application/x-msdownload", "dll");
MIME2EXT.put("application/x-msmediaview", "mvb");
MIME2EXT.put("application/x-msmetafile", "wmf");
MIME2EXT.put("application/x-mspublisher", "pub");
MIME2EXT.put("application/x-msschedule", "scd");
MIME2EXT.put("application/x-msterminal", "trm");
MIME2EXT.put("application/x-mswrite", "wri");
MIME2EXT.put("application/x-perfmon", "pmw");
MIME2EXT.put("application/x-pkcs12", "pfx");
MIME2EXT.put("application/x-pkcs12v", "p12");
MIME2EXT.put("application/x-pkcs7-certificates", "p7b");
MIME2EXT.put("application/x-pkcs7-certificates", "spc");
MIME2EXT.put("application/x-pkcs7-certreqresp", "p7r");
MIME2EXT.put("application/x-pkcs7-mime", "p7m");
MIME2EXT.put("application/x-pkcs7-signature", "p7s");
MIME2EXT.put("application/x-sh", "sh");
MIME2EXT.put("application/x-shar", "shar");
MIME2EXT.put("application/x-shockwave-flash", "swf");
MIME2EXT.put("application/x-stuffit", "sit");
MIME2EXT.put("application/x-tar", "tar");
MIME2EXT.put("application/x-tcl", "tcl");
MIME2EXT.put("application/x-tex", "tex");
MIME2EXT.put("application/x-texinfo", "texinfo");
MIME2EXT.put("application/x-troff-man", "man");
MIME2EXT.put("application/x-troff-me", "me");
MIME2EXT.put("application/x-troff-ms", "ms");
MIME2EXT.put("application/x-troff", "tr");
MIME2EXT.put("application/x-ustar", "ustar");
MIME2EXT.put("application/x-wais-source", "src");
MIME2EXT.put("application/x-x509-ca-cert", "cer");
MIME2EXT.put("application/ynd.ms-pkipko", "vpko");
MIME2EXT.put("application/zip", "zip");
MIME2EXT.put("audio/basic", "snd");
MIME2EXT.put("audio/flac", "flac");
MIME2EXT.put("audio/mid", "mid");
MIME2EXT.put("audio/mpeg", "mp3");
MIME2EXT.put("audio/ogg", "ogg");
MIME2EXT.put("audio/x-aiff", "aif");
MIME2EXT.put("audio/x-mpegurl", "m3u");
MIME2EXT.put("audio/x-pn-realaudio", "ram");
MIME2EXT.put("audio/x-wav", "wav");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "doct");
MIME2EXT.put("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");
MIME2EXT.put("image/bmp", "bmp");
MIME2EXT.put("image/cis-cod", "cod");
MIME2EXT.put("image/gif", "gif");
MIME2EXT.put("image/ief", "ief");
MIME2EXT.put("image/jpeg", "jpeg");
MIME2EXT.put("image/pipeg", "jfif");
MIME2EXT.put("image/png", "png");
MIME2EXT.put("image/svg+xml", "svg");
MIME2EXT.put("image/tiff", "tiff");
MIME2EXT.put("image/x-cmu-raster", "ras");
MIME2EXT.put("image/x-cmx", "cmx");
MIME2EXT.put("image/x-icon", "ico");
MIME2EXT.put("image/x-portable-anymap", "pnm");
MIME2EXT.put("image/x-portable-bitmap", "pbm");
MIME2EXT.put("image/x-portable-graymap", "pgm");
MIME2EXT.put("image/x-portable-pixmap", "ppm");
MIME2EXT.put("image/x-rgb", "rgb");
MIME2EXT.put("image/x-xbitmap", "xbm");
MIME2EXT.put("image/x-xpixmap", "xpm");
MIME2EXT.put("image/x-xwindowdump", "xwd");
MIME2EXT.put("message/rfc822", "mhtml");
MIME2EXT.put("text/css", "css");
MIME2EXT.put("text/html", "html");
MIME2EXT.put("text/iuls", "uls");
MIME2EXT.put("text/plain", "txt");
MIME2EXT.put("text/richtext", "rtx");
MIME2EXT.put("text/scriptlet", "sct");
MIME2EXT.put("text/tab-separated-values", "tsv");
MIME2EXT.put("text/webviewhtml", "htt");
MIME2EXT.put("text/x-component", "htc");
MIME2EXT.put("text/x-setext", "etx");
MIME2EXT.put("text/x-vcard", "vcf");
MIME2EXT.put("text/xml", "xml");
MIME2EXT.put("video/mpeg", "mpeg");
MIME2EXT.put("video/mpegv", "mpe");
MIME2EXT.put("video/ogg", "ogv");
MIME2EXT.put("video/quicktime", "mov");
MIME2EXT.put("video/quicktime", "qt");
MIME2EXT.put("video/x-la-asf", "lsf");
MIME2EXT.put("video/x-la-asf", "lsx");
MIME2EXT.put("video/x-ms-asf", "asf");
MIME2EXT.put("video/x-msvideo", "avi");
MIME2EXT.put("video/x-sgi-movie", "movie");
MIME2EXT.put("x-world/x-vrml", "vrml");
}
/**
* Returns the MIME type for file extension.
*/
public static String getMIMEType(String ext) {
if (ext == null) {
return EXT2MIME.get("");
}
int x = ext.lastIndexOf('.');
if (x > -1) {
ext = ext.substring(x + 1);
}
String mime = EXT2MIME.get(ext.toLowerCase());
if (mime == null) {
mime = URLConnection.getFileNameMap().getContentTypeFor("x." + ext);
}
if (mime == null) {
mime = EXT2MIME.get("");
}
return mime;
}
/**
* Returns the MIME type for a file.
*/
public static String getMIMEType(File file) {
if (file == null) {
return getMIMEType("");
}
return getMIMEType(file.getName());
}
/**
* Guesses a extension from a MIME type.
*/
public static String getExtension(String mimeType) {
if (mimeType == null) {
return "";
}
int x = mimeType.indexOf(';');
if (x > -1) {
mimeType = mimeType.substring(0, x);
}
mimeType = mimeType.trim().toLowerCase(Locale.ENGLISH);
String extension = MIME2EXT.get(mimeType);
return ((extension == null || extension.length() == 0) ? "" : "." + extension);
}
}
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