我已经在这里检查了答案，但是首先他们将它保存到某个地方，然后阅读它的流并尝试检查该文件的Mime类型
Get real file extension -Java code
但我想知道文件类型，甚至在将其保存到硬盘或某个地方之前。
我知道我可以通过以下两种方式来实现这个目标
File savedFile = new File(fileHandler.createTodayFolder(fileLocation) + "/" + name);
Path path = Paths.get(file.get);
Tika tika = new Tika();
String checkType = tika.detect(path.toFile());
和
Path path = Paths.get(savedFile.getPath());
Files.probeContentType(path)
但在这两种情况下，他们都使用的是已存在于硬盘中某个位置的文件。 我想要像这样的代码
public @ResponseBody ResponseEntity<?> importResume(@RequestParam(value = "name", required = false) String name,
@RequestParam("file") MultipartFile file) {
if (file!=DESIRED_TYPE)
{
return Exception;
}
}
有没有办法做到这一点？
答案 0 :(得分：27)
对我来说，这是最干净的解决方案：
使用org.apache.commons.io的FilenameUtils：
String extension = FilenameUtils.getExtension(file.getOriginalFilename());
答案 1 :(得分：9)
您可以通过制作地图将mimetype映射到现有的扩展程序......
您可以使用apache.mime.types创建一个像这样的地方：
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());
}
}
这样你就可以从内容类型中获得扩展名......
答案 2 :(得分：7)
您可以使用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);
}
这样可以在不保存文件的情况下获取mimetype
答案 3 :(得分：6)
要获取文件扩展名，您可以这样做：
multipartFile.getOriginalFilename().split("\\.")[1];
你得到的名字：
multipartFile.getOriginalFilename().split("\\.")[0];
如果用户上传扩展名为.doc的可执行文件怎么办？您可以获得内容类型：
multipartFile.getContentType();
这将返回MIME类型字符串。 要获得正确的文件扩展名，您可以在文件名字符串中搜索最后一个点，然后将其拆分到此位置。
答案 4 :(得分：2)
String extension = FilenameUtils.getExtension(inputFile.getOriginalFilename());
System.out.println("File Extension "+extension);
答案 5 :(得分：1)
给定字符串filename，您可以执行以下操作：
filename.substring(filename.lastIndexOf(".") + 1);
答案 6 :(得分：0)
我解决了分裂的问题。并采取最后一部分（不是第二部分），
获取扩展
String[] fileFrags = file.getOriginalFilename().split("\\.")
String extension = fileFrags[fileFrags.length-1]
获取名称
String fileName = file.substring(0,file.lenghth()-fileFrags[fileFrags-1].length()-1)
答案 7 :(得分：0)
您可以使用 org.springframework.util.StringUtils :
String extension = StringUtils.getFilenameExtension(file.getOriginalFilename());