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Wie die wirkliche Erweiterung Art von Multipart erhalten Datei

2015-10-19 4 views
11

Ich habe Antwort habe hier, aber hier zuerst sie es an einen Ort speichern und dann Strom, es ist zu lesen und zu versuchen, Mime-Typen der DateiWie die wirkliche Erweiterung Art von Multipart erhalten Datei

Get real file extension -Java code

zu überprüfen

Aber ich möchte den Dateityp wissen, bevor Sie es sogar auf der Festplatte oder an irgendeinem Ort speichern.

Ich weiß, dass ich es in diesen zwei weiteren Arten tut

File savedFile = new File(fileHandler.createTodayFolder(fileLocation) + "/" + name); 
      Path path = Paths.get(file.get); 
      Tika tika = new Tika(); 
      String checkType = tika.detect(path.toFile());

und

  Path path = Paths.get(savedFile.getPath()); 
      Files.probeContentType(path)

Aber in diesen beiden Fällen sie somefile verwenden, die auf der Festplatte an einer Stelle bereits. Ich möchte Code so etwas wie dieses

public @ResponseBody ResponseEntity<?> importResume(@RequestParam(value = "name", required = false) String name, 
     @RequestParam("file") MultipartFile file) { 

    if (file!=DESIRED_TYPE) 
    { 
     return Exception; 
    } 
}

Gibt es eine Möglichkeit, dies zu tun ???

Quelle

2015-10-19 Vipul

+1

Sie müssen beginnen, es zu streamen (lesen), sonst können Sie MIME nicht überprüfen. –

+0

@ PetterFriberg- Also was ich mache ist richtig oder nicht ?? – Vipul

+0

Sein arrving in einem Strom nehme ich an, vor dem Speichern auf dem hd überprüfen Sie den Stream für MIME-Typ .... wenn ok Sie sparen sonst nicht ... –

Antwort

8

Sie können die MIME-Typ zu einer bestehenden Verlängerung Karte durch eine Karte zu machen ...

Sie apache.mime.types verwenden können, für eine erstellen, wie es hier getan:

http://www.java2s.com/Code/Java/Network-Protocol/MapfileextensionstoMIMEtypesBasedontheApachemimetypesfile.htm

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_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_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; 

    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("xls", MIME_APPLICATION_VND_MSEXCEL); 
     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); 
    }}; 
     } 
public static void main(String[] args) { 
    System.out.println(mimeTypeMapping.size()); 
    } 

    /** 
    * 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()); 
    } 
}

diese Weise können Sie die Erweiterung aus dem Content-Typ erhalten könnte ...

Quelle

2015-10-19 12:32:24 inigoD

5

die Dateierweiterung erhalten Sie tun können:

multipartFile.getOriginalFilename().split("\\.")[1];

Der Name Mit erhalten:

multipartFile.getOriginalFilename().split("\\.")[0];

Was passiert, wenn der Benutzer eine ausführbare Datei mit Endung .doc hochladen? Sie könnten den Inhaltstyp erhalten:

multipartFile.getContentType();

Dies wird eine MIME-Typ-Zeichenfolge zurückgegeben. Um die richtige Dateierweiterung zu erhalten, können Sie die Dateinamenszeichenfolge nach dem letzten Punkt durchsuchen und ihn dann an dieser Position aufteilen.

Quelle

2015-10-20 05:50:00

+1

Aber was ist, wenn jemand eine ausführbare Datei hochlädt und ihm eine doc-Datei nennt, dann wird das nicht funktionieren, denke ich. Oder wenn jemand eine Datei mit 2 Extension hochlädt, dann funktioniert es auch nicht – Vipul

+0

Siehe die bearbeitete Antwort –

+6

Diese Lösung wird nicht funktionieren, wenn Sie einen Dateinamen mit Punkt haben, wie - "Screen Shot 2017-03-03 at 6.56.04 PM. png ". –

4

können Sie verwenden Tika https://tika.apache.org/

//file is a MultipartFile  
if(!file.isEmpty) 
{ 
    Tika tika = new Tika(); 
    String detectedType = tika.detect(file.getBytes()); 
    System.out.println(detectedType); 
}

Dies sollten Sie den MIME-Typ erhalten, ohne die Datei zu speichern

Quelle

2016-09-23 18:30:04 Veesta

0

Ich löste das Problem mit Splitting auf. und unter den letzten Teil (nicht die zweite),

Um Verlängerung

  String[] fileFrags = file.getOriginalFilename().split("\\.") 
      String extension = fileFrags[fileFrags.length-1]

Um den Namen

  String fileName = file.substring(0,file.lenghth()-fileFrags[fileFrags-1].length()-1)

Quelle

2017-03-04 15:00:49

+0

Diese Lösung überprüft nur die Dateierweiterung, die nicht direkt mit dem MIME-Typ verbunden ist (d. H. Jemand hat eine .exe-Datei mit der Erweiterung .doc hochgeladen). – be4code

10

Für mich die sauberste Lösung:

mit FilenameUtils von org.apache.commons.io:

String extension = FilenameUtils.getExtension(file.getOriginalFilename());

Quelle

2017-05-10 11:58:20

2

der String Dateiname angegeben, können Sie tun: filename.substring (filename.lastIndexOf() + 1 "");

Quelle

2017-07-07 19:34:35

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