我想从 MimeType 中获取扩展名。
例如：
video/mp4 ----> mp4
application/x-rar-compressed ----> rar
text/plain ----> txt
application/pdf ----> pdf
要在Windows或Linux上保存我的文件，我有这种方法可以让我从URL下载文件。所以，我只能在没有扩展名的情况下保存它（我不想这样做）。
此方法只允许我获取 MimeType 而不是扩展名。
public void DownloadImage() {
String TheFolderPath = "/home/MyPC/Downloaded";
String File_NAME = "My downloaded file";
URL fetchFile = new URL(IMAGE_URL);
byte[] FileAsArray = Resources.toByteArray(fetchFile);
//Getting the MimeType
String MimeType = URLConnection.guessContentTypeFromStream(new ByteArrayInputStream(FileAsArray));
System.out.println(MimeType);
File fileToWriteTo = new File(TheFolderPath.concat("/" + File_NAME));
//Saving the file using Guava
Files.write(FileAsArray, fileToWriteTo);
}
如何使用MimeType编写带扩展名的文件？
答案 0 :(得分：2)
一般有两种方式：
第二种方法真的不好，所以我只提供完成。对于第一种方法，您可以使用此资源：https://www.freeformatter.com/mime-types-list.html
我会使用HashMap<K,V> - 密钥是MimeType，值是扩展名（或类似名称）。
答案 1 :(得分：1)
使用“MindaugasBernatavičius”的建议，我创建了一个课程来解决我的问题。
import java.util.HashMap;
public class MimeTypesAndExtensions {
static HashMap<String, String> TheHashMap = new HashMap<String, String>();
public MimeTypesAndExtensions() {
super();
}
static {
CreateHashMap();
}
/*****************************************************************************
Extracted from : https://www.freeformatter.com/mime-types-list.html
- The "x-" prefix of a MIME subtype simply means that it's non-standard,
i.e. not registered with the "Internet Assigned Numbers Authority" (IANA).
- The "vnd" prefix means that the MIME value is vendor specific.
*****************************************************************************/
private static void CreateHashMap() {
// This list is not complete...
// I got it from https://www.freeformatter.com/mime-types-list.html
TheHashMap.put("application/vnd.hzn-3d-crossword", "x3d");
TheHashMap.put("application/vnd.lotus-1-2-3", "123");
TheHashMap.put("text/vnd.in3d.3dml", "3dml");
TheHashMap.put("video/3gpp2", "3g2");
.....
TheHashMap.put("application/yin+xml", "yin");
TheHashMap.put("application/vnd.zzazz.deck+xml", "zaz");
TheHashMap.put("application/zip", "zip");
TheHashMap.put("application/vnd.zul", "zir");
TheHashMap.put("application/vnd.handheld-entertainment+xml", "zmm");
TheHashMap.put("application/andrew-inset", "N/A");
}
public static String getExtensionFromMimeType(String TheMimeType) {
String TheExtension = "Extension Not Found";
for(String key: TheHashMap.keySet()){
if(key.toLowerCase().equals(TheMimeType.toLowerCase())) {
TheExtension = TheHashMap.get(key);
return TheExtension;
}
}
return TheExtension;
}
public static String getMimeTypeFromExtension(String TheExtension) {
StringBuilder TheMimeTypes = new StringBuilder();
for(String key: TheHashMap.keySet()){
if(TheHashMap.get(key.toLowerCase()).equals(TheExtension.toLowerCase())) {
TheMimeTypes.append(key.concat("\n"));
}
}
if(TheMimeTypes.length() == 0)
return "MimeType Not Found";
return TheMimeTypes.toString();
}
public static String getMimeTypesAndExtensions(){
StringBuilder TheMimeTypesAndExtensions = new StringBuilder();
for(String key: TheHashMap.keySet()){
TheMimeTypesAndExtensions.append(TheHashMap.get(key).concat(" -----> ").concat(key).concat("\n"));
}
return TheMimeTypesAndExtensions.toString();
}
}
答案 2 :(得分：1)
这个问题的问题是，几个扩展可以产生相同的MimeType，反之亦然，您可以在许多utils类中找到它，例如：MimetypesFileTypeMap，但是我发现了这个有用的类{{3} }，并且我做了一点技巧，添加了MimeTypes之类的扩展名映射，请记住，这会返回MimeType的默认扩展名，但可能不准确。
// Copyright (c) 2003-2009, Jodd Team (jodd.org). All Rights Reserved.
package co.tmunited.fs.service.util;
import java.util.HashMap;
/**
* Map file extensions to MIME types. Based on the Apache mime.types file.
* http://www.iana.org/assignments/media-types/
*/
public class MimeTypes {
public static final String MIME_APPLICATION_ANDREW_INSET = "application/andrew-inset";
public static final String MIME_APPLICATION_JSON = "application/json";
public static final String MIME_APPLICATION_ZIP = "application/zip";
public static final String MIME_APPLICATION_X_GZIP = "application/x-gzip";
public static final String MIME_APPLICATION_TGZ = "application/tgz";
public static final String MIME_APPLICATION_MSWORD = "application/msword";
public static final String MIME_APPLICATION_MSWORD_2007 = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
public static final String MIME_APPLICATION_VND_TEXT = "application/vnd.oasis.opendocument.text";
public static final String MIME_APPLICATION_POSTSCRIPT = "application/postscript";
public static final String MIME_APPLICATION_PDF = "application/pdf";
public static final String MIME_APPLICATION_JNLP = "application/jnlp";
public static final String MIME_APPLICATION_MAC_BINHEX40 = "application/mac-binhex40";
public static final String MIME_APPLICATION_MAC_COMPACTPRO = "application/mac-compactpro";
public static final String MIME_APPLICATION_MATHML_XML = "application/mathml+xml";
public static final String MIME_APPLICATION_OCTET_STREAM = "application/octet-stream";
public static final String MIME_APPLICATION_ODA = "application/oda";
public static final String MIME_APPLICATION_RDF_XML = "application/rdf+xml";
public static final String MIME_APPLICATION_JAVA_ARCHIVE = "application/java-archive";
public static final String MIME_APPLICATION_RDF_SMIL = "application/smil";
public static final String MIME_APPLICATION_SRGS = "application/srgs";
public static final String MIME_APPLICATION_SRGS_XML = "application/srgs+xml";
public static final String MIME_APPLICATION_VND_MIF = "application/vnd.mif";
public static final String MIME_APPLICATION_VND_MSEXCEL = "application/vnd.ms-excel";
public static final String MIME_APPLICATION_VND_MSEXCEL_2007 = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
public static final String MIME_APPLICATION_VND_SPREADSHEET = "application/vnd.oasis.opendocument.spreadsheet";
public static final String MIME_APPLICATION_VND_MSPOWERPOINT = "application/vnd.ms-powerpoint";
public static final String MIME_APPLICATION_VND_RNREALMEDIA = "application/vnd.rn-realmedia";
public static final String MIME_APPLICATION_X_BCPIO = "application/x-bcpio";
public static final String MIME_APPLICATION_X_CDLINK = "application/x-cdlink";
public static final String MIME_APPLICATION_X_CHESS_PGN = "application/x-chess-pgn";
public static final String MIME_APPLICATION_X_CPIO = "application/x-cpio";
public static final String MIME_APPLICATION_X_CSH = "application/x-csh";
public static final String MIME_APPLICATION_X_DIRECTOR = "application/x-director";
public static final String MIME_APPLICATION_X_DVI = "application/x-dvi";
public static final String MIME_APPLICATION_X_FUTURESPLASH = "application/x-futuresplash";
public static final String MIME_APPLICATION_X_GTAR = "application/x-gtar";
public static final String MIME_APPLICATION_X_HDF = "application/x-hdf";
public static final String MIME_APPLICATION_X_JAVASCRIPT = "application/x-javascript";
public static final String MIME_APPLICATION_X_KOAN = "application/x-koan";
public static final String MIME_APPLICATION_X_LATEX = "application/x-latex";
public static final String MIME_APPLICATION_X_NETCDF = "application/x-netcdf";
public static final String MIME_APPLICATION_X_OGG = "application/x-ogg";
public static final String MIME_APPLICATION_X_SH = "application/x-sh";
public static final String MIME_APPLICATION_X_SHAR = "application/x-shar";
public static final String MIME_APPLICATION_X_SHOCKWAVE_FLASH = "application/x-shockwave-flash";
public static final String MIME_APPLICATION_X_STUFFIT = "application/x-stuffit";
public static final String MIME_APPLICATION_X_SV4CPIO = "application/x-sv4cpio";
public static final String MIME_APPLICATION_X_SV4CRC = "application/x-sv4crc";
public static final String MIME_APPLICATION_X_TAR = "application/x-tar";
public static final String MIME_APPLICATION_X_RAR_COMPRESSED = "application/x-rar-compressed";
public static final String MIME_APPLICATION_X_TCL = "application/x-tcl";
public static final String MIME_APPLICATION_X_TEX = "application/x-tex";
public static final String MIME_APPLICATION_X_TEXINFO = "application/x-texinfo";
public static final String MIME_APPLICATION_X_TROFF = "application/x-troff";
public static final String MIME_APPLICATION_X_TROFF_MAN = "application/x-troff-man";
public static final String MIME_APPLICATION_X_TROFF_ME = "application/x-troff-me";
public static final String MIME_APPLICATION_X_TROFF_MS = "application/x-troff-ms";
public static final String MIME_APPLICATION_X_USTAR = "application/x-ustar";
public static final String MIME_APPLICATION_X_WAIS_SOURCE = "application/x-wais-source";
public static final String MIME_APPLICATION_VND_MOZZILLA_XUL_XML = "application/vnd.mozilla.xul+xml";
public static final String MIME_APPLICATION_XHTML_XML = "application/xhtml+xml";
public static final String MIME_APPLICATION_XSLT_XML = "application/xslt+xml";
public static final String MIME_APPLICATION_XML = "application/xml";
public static final String MIME_APPLICATION_XML_DTD = "application/xml-dtd";
public static final String MIME_IMAGE_BMP = "image/bmp";
public static final String MIME_IMAGE_CGM = "image/cgm";
public static final String MIME_IMAGE_GIF = "image/gif";
public static final String MIME_IMAGE_IEF = "image/ief";
public static final String MIME_IMAGE_JPEG = "image/jpeg";
public static final String MIME_IMAGE_TIFF = "image/tiff";
public static final String MIME_IMAGE_PNG = "image/png";
public static final String MIME_IMAGE_SVG_XML = "image/svg+xml";
public static final String MIME_IMAGE_VND_DJVU = "image/vnd.djvu";
public static final String MIME_IMAGE_WAP_WBMP = "image/vnd.wap.wbmp";
public static final String MIME_IMAGE_X_CMU_RASTER = "image/x-cmu-raster";
public static final String MIME_IMAGE_X_ICON = "image/x-icon";
public static final String MIME_IMAGE_X_PORTABLE_ANYMAP = "image/x-portable-anymap";
public static final String MIME_IMAGE_X_PORTABLE_BITMAP = "image/x-portable-bitmap";
public static final String MIME_IMAGE_X_PORTABLE_GRAYMAP = "image/x-portable-graymap";
public static final String MIME_IMAGE_X_PORTABLE_PIXMAP = "image/x-portable-pixmap";
public static final String MIME_IMAGE_X_RGB = "image/x-rgb";
public static final String MIME_AUDIO_BASIC = "audio/basic";
public static final String MIME_AUDIO_MIDI = "audio/midi";
public static final String MIME_AUDIO_MPEG = "audio/mpeg";
public static final String MIME_AUDIO_X_AIFF = "audio/x-aiff";
public static final String MIME_AUDIO_X_MPEGURL = "audio/x-mpegurl";
public static final String MIME_AUDIO_X_PN_REALAUDIO = "audio/x-pn-realaudio";
public static final String MIME_AUDIO_X_WAV = "audio/x-wav";
public static final String MIME_CHEMICAL_X_PDB = "chemical/x-pdb";
public static final String MIME_CHEMICAL_X_XYZ = "chemical/x-xyz";
public static final String MIME_MODEL_IGES = "model/iges";
public static final String MIME_MODEL_MESH = "model/mesh";
public static final String MIME_MODEL_VRLM = "model/vrml";
public static final String MIME_TEXT_PLAIN = "text/plain";
public static final String MIME_TEXT_RICHTEXT = "text/richtext";
public static final String MIME_TEXT_RTF = "text/rtf";
public static final String MIME_TEXT_HTML = "text/html";
public static final String MIME_TEXT_CALENDAR = "text/calendar";
public static final String MIME_TEXT_CSS = "text/css";
public static final String MIME_TEXT_SGML = "text/sgml";
public static final String MIME_TEXT_TAB_SEPARATED_VALUES = "text/tab-separated-values";
public static final String MIME_TEXT_VND_WAP_XML = "text/vnd.wap.wml";
public static final String MIME_TEXT_VND_WAP_WMLSCRIPT = "text/vnd.wap.wmlscript";
public static final String MIME_TEXT_X_SETEXT = "text/x-setext";
public static final String MIME_TEXT_X_COMPONENT = "text/x-component";
public static final String MIME_VIDEO_QUICKTIME = "video/quicktime";
public static final String MIME_VIDEO_MPEG = "video/mpeg";
public static final String MIME_VIDEO_VND_MPEGURL = "video/vnd.mpegurl";
public static final String MIME_VIDEO_X_MSVIDEO = "video/x-msvideo";
public static final String MIME_VIDEO_X_MS_WMV = "video/x-ms-wmv";
public static final String MIME_VIDEO_X_SGI_MOVIE = "video/x-sgi-movie";
public static final String MIME_X_CONFERENCE_X_COOLTALK = "x-conference/x-cooltalk";
private static HashMap<String, String> mimeTypeMapping;
private static HashMap<String, String> extMapping;
static {
mimeTypeMapping = new HashMap<String, String>(200) {
private void put1(String key, String value) {
if (put(key, value) != null) {
throw new IllegalArgumentException("Duplicated extension: " + key);
}
}
{
put1("xul", MIME_APPLICATION_VND_MOZZILLA_XUL_XML);
put1("json", MIME_APPLICATION_JSON);
put1("ice", MIME_X_CONFERENCE_X_COOLTALK);
put1("movie", MIME_VIDEO_X_SGI_MOVIE);
put1("avi", MIME_VIDEO_X_MSVIDEO);
put1("wmv", MIME_VIDEO_X_MS_WMV);
put1("m4u", MIME_VIDEO_VND_MPEGURL);
put1("mxu", MIME_VIDEO_VND_MPEGURL);
put1("htc", MIME_TEXT_X_COMPONENT);
put1("etx", MIME_TEXT_X_SETEXT);
put1("wmls", MIME_TEXT_VND_WAP_WMLSCRIPT);
put1("wml", MIME_TEXT_VND_WAP_XML);
put1("tsv", MIME_TEXT_TAB_SEPARATED_VALUES);
put1("sgm", MIME_TEXT_SGML);
put1("sgml", MIME_TEXT_SGML);
put1("css", MIME_TEXT_CSS);
put1("ifb", MIME_TEXT_CALENDAR);
put1("ics", MIME_TEXT_CALENDAR);
put1("wrl", MIME_MODEL_VRLM);
put1("vrlm", MIME_MODEL_VRLM);
put1("silo", MIME_MODEL_MESH);
put1("mesh", MIME_MODEL_MESH);
put1("msh", MIME_MODEL_MESH);
put1("iges", MIME_MODEL_IGES);
put1("igs", MIME_MODEL_IGES);
put1("rgb", MIME_IMAGE_X_RGB);
put1("ppm", MIME_IMAGE_X_PORTABLE_PIXMAP);
put1("pgm", MIME_IMAGE_X_PORTABLE_GRAYMAP);
put1("pbm", MIME_IMAGE_X_PORTABLE_BITMAP);
put1("pnm", MIME_IMAGE_X_PORTABLE_ANYMAP);
put1("ico", MIME_IMAGE_X_ICON);
put1("ras", MIME_IMAGE_X_CMU_RASTER);
put1("wbmp", MIME_IMAGE_WAP_WBMP);
put1("djv", MIME_IMAGE_VND_DJVU);
put1("djvu", MIME_IMAGE_VND_DJVU);
put1("svg", MIME_IMAGE_SVG_XML);
put1("ief", MIME_IMAGE_IEF);
put1("cgm", MIME_IMAGE_CGM);
put1("bmp", MIME_IMAGE_BMP);
put1("xyz", MIME_CHEMICAL_X_XYZ);
put1("pdb", MIME_CHEMICAL_X_PDB);
put1("ra", MIME_AUDIO_X_PN_REALAUDIO);
put1("ram", MIME_AUDIO_X_PN_REALAUDIO);
put1("m3u", MIME_AUDIO_X_MPEGURL);
put1("aifc", MIME_AUDIO_X_AIFF);
put1("aif", MIME_AUDIO_X_AIFF);
put1("aiff", MIME_AUDIO_X_AIFF);
put1("mp3", MIME_AUDIO_MPEG);
put1("mp2", MIME_AUDIO_MPEG);
put1("mp1", MIME_AUDIO_MPEG);
put1("mpga", MIME_AUDIO_MPEG);
put1("kar", MIME_AUDIO_MIDI);
put1("mid", MIME_AUDIO_MIDI);
put1("midi", MIME_AUDIO_MIDI);
put1("dtd", MIME_APPLICATION_XML_DTD);
put1("xsl", MIME_APPLICATION_XML);
put1("xml", MIME_APPLICATION_XML);
put1("xslt", MIME_APPLICATION_XSLT_XML);
put1("xht", MIME_APPLICATION_XHTML_XML);
put1("xhtml", MIME_APPLICATION_XHTML_XML);
put1("src", MIME_APPLICATION_X_WAIS_SOURCE);
put1("ustar", MIME_APPLICATION_X_USTAR);
put1("ms", MIME_APPLICATION_X_TROFF_MS);
put1("me", MIME_APPLICATION_X_TROFF_ME);
put1("man", MIME_APPLICATION_X_TROFF_MAN);
put1("roff", MIME_APPLICATION_X_TROFF);
put1("tr", MIME_APPLICATION_X_TROFF);
put1("t", MIME_APPLICATION_X_TROFF);
put1("texi", MIME_APPLICATION_X_TEXINFO);
put1("texinfo", MIME_APPLICATION_X_TEXINFO);
put1("tex", MIME_APPLICATION_X_TEX);
put1("tcl", MIME_APPLICATION_X_TCL);
put1("sv4crc", MIME_APPLICATION_X_SV4CRC);
put1("sv4cpio", MIME_APPLICATION_X_SV4CPIO);
put1("sit", MIME_APPLICATION_X_STUFFIT);
put1("swf", MIME_APPLICATION_X_SHOCKWAVE_FLASH);
put1("shar", MIME_APPLICATION_X_SHAR);
put1("sh", MIME_APPLICATION_X_SH);
put1("cdf", MIME_APPLICATION_X_NETCDF);
put1("nc", MIME_APPLICATION_X_NETCDF);
put1("latex", MIME_APPLICATION_X_LATEX);
put1("skm", MIME_APPLICATION_X_KOAN);
put1("skt", MIME_APPLICATION_X_KOAN);
put1("skd", MIME_APPLICATION_X_KOAN);
put1("skp", MIME_APPLICATION_X_KOAN);
put1("js", MIME_APPLICATION_X_JAVASCRIPT);
put1("hdf", MIME_APPLICATION_X_HDF);
put1("gtar", MIME_APPLICATION_X_GTAR);
put1("spl", MIME_APPLICATION_X_FUTURESPLASH);
put1("dvi", MIME_APPLICATION_X_DVI);
put1("dxr", MIME_APPLICATION_X_DIRECTOR);
put1("dir", MIME_APPLICATION_X_DIRECTOR);
put1("dcr", MIME_APPLICATION_X_DIRECTOR);
put1("csh", MIME_APPLICATION_X_CSH);
put1("cpio", MIME_APPLICATION_X_CPIO);
put1("pgn", MIME_APPLICATION_X_CHESS_PGN);
put1("vcd", MIME_APPLICATION_X_CDLINK);
put1("bcpio", MIME_APPLICATION_X_BCPIO);
put1("rm", MIME_APPLICATION_VND_RNREALMEDIA);
put1("ppt", MIME_APPLICATION_VND_MSPOWERPOINT);
put1("mif", MIME_APPLICATION_VND_MIF);
put1("grxml", MIME_APPLICATION_SRGS_XML);
put1("gram", MIME_APPLICATION_SRGS);
put1("smil", MIME_APPLICATION_RDF_SMIL);
put1("smi", MIME_APPLICATION_RDF_SMIL);
put1("rdf", MIME_APPLICATION_RDF_XML);
put1("ogg", MIME_APPLICATION_X_OGG);
put1("oda", MIME_APPLICATION_ODA);
put1("dmg", MIME_APPLICATION_OCTET_STREAM);
put1("lzh", MIME_APPLICATION_OCTET_STREAM);
put1("so", MIME_APPLICATION_OCTET_STREAM);
put1("lha", MIME_APPLICATION_OCTET_STREAM);
put1("dms", MIME_APPLICATION_OCTET_STREAM);
put1("bin", MIME_APPLICATION_OCTET_STREAM);
put1("mathml", MIME_APPLICATION_MATHML_XML);
put1("cpt", MIME_APPLICATION_MAC_COMPACTPRO);
put1("hqx", MIME_APPLICATION_MAC_BINHEX40);
put1("jnlp", MIME_APPLICATION_JNLP);
put1("ez", MIME_APPLICATION_ANDREW_INSET);
put1("txt", MIME_TEXT_PLAIN);
put1("ini", MIME_TEXT_PLAIN);
put1("c", MIME_TEXT_PLAIN);
put1("h", MIME_TEXT_PLAIN);
put1("cpp", MIME_TEXT_PLAIN);
put1("cxx", MIME_TEXT_PLAIN);
put1("cc", MIME_TEXT_PLAIN);
put1("chh", MIME_TEXT_PLAIN);
put1("java", MIME_TEXT_PLAIN);
put1("csv", MIME_TEXT_PLAIN);
put1("bat", MIME_TEXT_PLAIN);
put1("cmd", MIME_TEXT_PLAIN);
put1("asc", MIME_TEXT_PLAIN);
put1("rtf", MIME_TEXT_RTF);
put1("rtx", MIME_TEXT_RICHTEXT);
put1("html", MIME_TEXT_HTML);
put1("htm", MIME_TEXT_HTML);
put1("zip", MIME_APPLICATION_ZIP);
put1("rar", MIME_APPLICATION_X_RAR_COMPRESSED);
put1("gzip", MIME_APPLICATION_X_GZIP);
put1("gz", MIME_APPLICATION_X_GZIP);
put1("tgz", MIME_APPLICATION_TGZ);
put1("tar", MIME_APPLICATION_X_TAR);
put1("gif", MIME_IMAGE_GIF);
put1("jpeg", MIME_IMAGE_JPEG);
put1("jpg", MIME_IMAGE_JPEG);
put1("jpe", MIME_IMAGE_JPEG);
put1("tiff", MIME_IMAGE_TIFF);
put1("tif", MIME_IMAGE_TIFF);
put1("png", MIME_IMAGE_PNG);
put1("au", MIME_AUDIO_BASIC);
put1("snd", MIME_AUDIO_BASIC);
put1("wav", MIME_AUDIO_X_WAV);
put1("mov", MIME_VIDEO_QUICKTIME);
put1("qt", MIME_VIDEO_QUICKTIME);
put1("mpeg", MIME_VIDEO_MPEG);
put1("mpg", MIME_VIDEO_MPEG);
put1("mpe", MIME_VIDEO_MPEG);
put1("abs", MIME_VIDEO_MPEG);
put1("doc", MIME_APPLICATION_MSWORD);
put1("docx", MIME_APPLICATION_MSWORD_2007);
put1("odt", MIME_APPLICATION_VND_TEXT);
put1("xls", MIME_APPLICATION_VND_MSEXCEL);
put1("xlsx", MIME_APPLICATION_VND_MSEXCEL_2007);
put1("ods", MIME_APPLICATION_VND_SPREADSHEET);
put1("eps", MIME_APPLICATION_POSTSCRIPT);
put1("ai", MIME_APPLICATION_POSTSCRIPT);
put1("ps", MIME_APPLICATION_POSTSCRIPT);
put1("pdf", MIME_APPLICATION_PDF);
put1("exe", MIME_APPLICATION_OCTET_STREAM);
put1("dll", MIME_APPLICATION_OCTET_STREAM);
put1("class", MIME_APPLICATION_OCTET_STREAM);
put1("jar", MIME_APPLICATION_JAVA_ARCHIVE);
}
};
}
static {
extMapping = new HashMap<String, String>(200) {
private void put1(String key, String value) {
if (put(key, value) != null) {
throw new IllegalArgumentException("Duplicated Mimetype: " + key);
}
}
{
put1(MIME_APPLICATION_VND_MOZZILLA_XUL_XML, "xul");
put1(MIME_APPLICATION_JSON, "json");
put1(MIME_X_CONFERENCE_X_COOLTALK, "ice");
put1(MIME_VIDEO_X_SGI_MOVIE, "movie");
put1(MIME_VIDEO_X_MSVIDEO, "avi");
put1(MIME_VIDEO_X_MS_WMV, "wmv");
put1(MIME_VIDEO_VND_MPEGURL, "m4u");
put1(MIME_TEXT_X_COMPONENT, "htc");
put1(MIME_TEXT_X_SETEXT, "etx");
put1(MIME_TEXT_VND_WAP_WMLSCRIPT, "wmls");
put1(MIME_TEXT_VND_WAP_XML, "wml");
put1(MIME_TEXT_TAB_SEPARATED_VALUES, "tsv");
put1(MIME_TEXT_SGML, "sgml");
put1(MIME_TEXT_CSS, "css");
put1(MIME_TEXT_CALENDAR, "ics");
put1(MIME_MODEL_VRLM, "vrlm");
put1(MIME_MODEL_MESH, "mesh");
put1(MIME_MODEL_IGES, "iges");
put1(MIME_IMAGE_X_RGB, "rgb");
put1(MIME_IMAGE_X_PORTABLE_PIXMAP, "ppm");
put1(MIME_IMAGE_X_PORTABLE_GRAYMAP, "pgm");
put1(MIME_IMAGE_X_PORTABLE_BITMAP, "pbm");
put1(MIME_IMAGE_X_PORTABLE_ANYMAP, "pnm");
put1(MIME_IMAGE_X_ICON, "ico");
put1(MIME_IMAGE_X_CMU_RASTER, "ras");
put1(MIME_IMAGE_WAP_WBMP, "wbmp");
put1(MIME_IMAGE_VND_DJVU, "djvu");
put1(MIME_IMAGE_SVG_XML, "svg");
put1(MIME_IMAGE_IEF, "ief");
put1(MIME_IMAGE_CGM, "cgm");
put1(MIME_IMAGE_BMP, "bmp");
put1(MIME_CHEMICAL_X_XYZ, "xyz");
put1(MIME_CHEMICAL_X_PDB, "pdb");
put1(MIME_AUDIO_X_PN_REALAUDIO, "ra");
put1(MIME_AUDIO_X_MPEGURL, "m3u");
put1(MIME_AUDIO_X_AIFF, "aiff");
put1(MIME_AUDIO_MPEG, "mp3");
put1(MIME_AUDIO_MIDI, "midi");
put1(MIME_APPLICATION_XML_DTD, "dtd");
put1(MIME_APPLICATION_XML, "xml");
put1(MIME_APPLICATION_XSLT_XML, "xslt");
put1(MIME_APPLICATION_XHTML_XML, "xhtml");
put1(MIME_APPLICATION_X_WAIS_SOURCE, "src");
put1(MIME_APPLICATION_X_USTAR, "ustar");
put1(MIME_APPLICATION_X_TROFF_MS, "ms");
put1(MIME_APPLICATION_X_TROFF_ME, "me");
put1(MIME_APPLICATION_X_TROFF_MAN, "man");
put1(MIME_APPLICATION_X_TROFF, "roff");
put1(MIME_APPLICATION_X_TEXINFO, "texi");
put1(MIME_APPLICATION_X_TEX, "tex");
put1(MIME_APPLICATION_X_TCL, "tcl");
put1(MIME_APPLICATION_X_SV4CRC, "sv4crc");
put1(MIME_APPLICATION_X_SV4CPIO, "sv4cpio");
put1(MIME_APPLICATION_X_STUFFIT, "sit");
put1(MIME_APPLICATION_X_SHOCKWAVE_FLASH, "swf");
put1(MIME_APPLICATION_X_SHAR, "shar");
put1(MIME_APPLICATION_X_SH, "sh");
put1(MIME_APPLICATION_X_NETCDF, "cdf");
put1(MIME_APPLICATION_X_LATEX, "latex");
put1(MIME_APPLICATION_X_KOAN, "skm");
put1(MIME_APPLICATION_X_JAVASCRIPT, "js");
put1(MIME_APPLICATION_X_HDF, "hdf");
put1(MIME_APPLICATION_X_GTAR, "gtar");
put1(MIME_APPLICATION_X_FUTURESPLASH, "spl");
put1(MIME_APPLICATION_X_DVI, "dvi");
put1(MIME_APPLICATION_X_DIRECTOR, "dir");
put1(MIME_APPLICATION_X_CSH, "csh");
put1(MIME_APPLICATION_X_CPIO, "cpio");
put1(MIME_APPLICATION_X_CHESS_PGN, "pgn");
put1(MIME_APPLICATION_X_CDLINK, "vcd");
put1(MIME_APPLICATION_X_BCPIO, "bcpio");
put1(MIME_APPLICATION_VND_RNREALMEDIA, "rm");
put1(MIME_APPLICATION_VND_MSPOWERPOINT, "ppt");
put1(MIME_APPLICATION_VND_MIF, "mif");
put1(MIME_APPLICATION_SRGS_XML, "grxml");
put1(MIME_APPLICATION_SRGS, "gram");
put1(MIME_APPLICATION_RDF_SMIL, "smil");
put1(MIME_APPLICATION_RDF_XML, "rdf");
put1(MIME_APPLICATION_X_OGG, "ogg");
put1(MIME_APPLICATION_ODA, "oda");
put1(MIME_APPLICATION_MATHML_XML, "mathml");
put1(MIME_APPLICATION_MAC_COMPACTPRO, "cpt");
put1(MIME_APPLICATION_MAC_BINHEX40, "hqx");
put1(MIME_APPLICATION_JNLP, "jnlp");
put1(MIME_APPLICATION_ANDREW_INSET, "ez");
put1(MIME_TEXT_PLAIN, "txt");
put1(MIME_TEXT_RTF, "rtf");
put1(MIME_TEXT_RICHTEXT, "rtx");
put1(MIME_TEXT_HTML, "html");
put1(MIME_APPLICATION_ZIP, "zip");
put1(MIME_APPLICATION_X_RAR_COMPRESSED, "rar");
put1(MIME_APPLICATION_X_GZIP, "gzip");
put1(MIME_APPLICATION_TGZ, "tgz");
put1(MIME_APPLICATION_X_TAR, "tar");
put1(MIME_IMAGE_GIF, "gif");
put1(MIME_IMAGE_JPEG, "jpg");
put1(MIME_IMAGE_TIFF, "tiff");
put1(MIME_IMAGE_PNG, "png");
put1(MIME_AUDIO_BASIC, "au");
put1(MIME_AUDIO_X_WAV, "wav");
put1(MIME_VIDEO_QUICKTIME, "mov");
put1(MIME_VIDEO_MPEG, "mpg");
put1(MIME_APPLICATION_MSWORD, "doc");
put1(MIME_APPLICATION_MSWORD_2007, "docx");
put1(MIME_APPLICATION_VND_TEXT, "odt");
put1(MIME_APPLICATION_VND_MSEXCEL, "xls");
put1(MIME_APPLICATION_VND_SPREADSHEET, "ods");
put1(MIME_APPLICATION_POSTSCRIPT, "ps");
put1(MIME_APPLICATION_PDF, "pdf");
put1(MIME_APPLICATION_OCTET_STREAM, "exe");
put1(MIME_APPLICATION_JAVA_ARCHIVE, "jar");
}
};
}
/**
* Registers MIME type for provided extension. Existing extension type will be overriden.
*/
public static void registerMimeType(String ext, String mimeType) {
mimeTypeMapping.put(ext, mimeType);
}
/**
* Returns the corresponding MIME type to the given extension.
* If no MIME type was found it returns 'application/octet-stream' type.
*/
public static String getMimeType(String ext) {
String mimeType = lookupMimeType(ext);
if (mimeType == null) {
mimeType = MIME_APPLICATION_OCTET_STREAM;
}
return mimeType;
}
/**
* Simply returns MIME type or <code>null</code> if no type is found.
*/
public static String lookupMimeType(String ext) {
return mimeTypeMapping.get(ext.toLowerCase());
}
/**
* Simply returns Ext or <code>null</code> if no Mimetype is found.
*/
public static String lookupExt(String mimeType) {
return extMapping.get(mimeType.toLowerCase());
}
/**
* Returns the default Ext to the given MimeType.
* If no MIME type was found it returns 'unknown' ext.
*/
public static String getDefaultExt(String mimeType) {
String ext = lookupExt(mimeType);
if (ext == null) {
ext = "unknown";
}
return ext;
}
}
您可以像这样使用它：
@Test
public void mimetypePdf() throws Exception {
String ext = MimeTypes.getDefaultExt(MimeTypes.MIME_APPLICATION_PDF);
Assert.assertEquals("Not equals", "pdf", ext);
}
答案 3 :(得分：1)
尝试jodd。有一个实用程序：MimeUtil.getMimeType()，带有扩展名并返回mime类型。参见：https://github.com/oblac/jodd/blob/master/jodd-core/src/main/java/jodd/net/MimeTypes.java#L119
编辑：作者。
答案 4 :(得分：-1)
对于运行 Spring 项目的所有人：
import org.springframework.util.MimeTypeUtils;
...
String fileExtension = MimeTypeUtils.parseMimeType(attachment.getMimeType()).getSubtype();
由于MimeTypeUtils位于spring-core模块中，如果您没有spring项目，可能就不值得依赖此模块了。
更新 不适用于所有情况，也不适用于原始问题。仅在subType等于文件扩展名（例如png，jpeg，pdf等）的情况下。感谢评论。