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vsd是什么文件格式(如何打开vsd文件)

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Mime Type（Content-Type）

MIME Type介绍 Content-Type 各种定义

多用途互联网邮件扩展（MIME。Multipurpose Internet Mail Extensions）是一个互联网标准。它扩展了电子邮件标准。使其能够支持非ASCII字符、二进制格式附件等多种格式的邮件消息。在万维网中使用的HTTP协议中也使用了MIME的框架。标准被扩展为互联网媒体类型。通常来说。浏览器通过MIME Type区分不同的媒体资源。目前版本：1.0。

MIME Type是经由IETF组织协商。以RFC形式作为建议标准发布在网上。通常只有一些在互联网上获得广泛应用的格式才会获得一个 MIME Type。如果是某个客户端自己定义的格式。一般只能以application/x- 开头。处理本地的文件。在没有人告诉浏览器某个文件的MIME Type的情况下。浏览器也会做一些默认的处理。这可能和在操作系统中给文件配置的MIME Type有关。

在HTTP中。MIME Type类型被定义在Content-Type header中。每个MIME类型由3部分组成：Content-Type: [type]/[subtype]。前者是数据大类别。后者定义具体的种类。

通过文件扩展名获取ContentType

importlombok.Getter;
importorg.apache.commons.lang3.StringUtils;

/**
*通过文件扩展名获取ContentType
*/
@Getter
publicenumMimeTypeEnum{

AAC("acc","AAC音频","audio/aac"),
ABW("abw","AbiWord文件","application/x-abiword"),
ARC("arc","存档文件","application/x-freearc"),
AVI("avi","音频视频交错格式","video/x-msvideo"),
AZW("azw","亚马逊Kindle电子书格式","application/vnd.amazon.ebook"),
BIN("bin","任何类型的二进制数据","application/octet-stream"),
BMP("bmp","WindowsOS/2位图图形","image/bmp"),
BZ("bz","BZip存档","application/x-bzip"),
BZ2("bz2","BZip2存档","application/x-bzip2"),
CSH("csh","C-Shell脚本","application/x-csh"),
css("css","级联样式表（CSS）","text/css"),
CSV("csv","逗号分隔值（CSV）","text/csv"),
DOC("doc","微软Word文件","application/msword"),
DOCX("docx","MicrosoftWord（OpenXML）","application/vnd.openxmlformats-officedocument.wordprocessingml.document"),
EOT("eot","MSEmbeddedOpenType字体","application/vnd.ms-fontobject"),
EPUB("epub","电子出版物（EPUB）","application/epub+zip"),
GZ("gz","GZip压缩档案","application/gzip"),
GIF("gif","图形交换格式（GIF）","image/gif"),
HTM("htm","超文本标记语言（html）","text/html"),
HTML("html","超文本标记语言（HTML）","text/html"),
ICO("ico","图标格式","image/vnd.microsoft.icon"),
ICS("ics","iCalendar格式","text/calendar"),
JAR("jar","java存档","application/java-archive"),
JPEG("jpeg","JPEG图像","image/jpeg"),
JPG("jpg","JPEG图像","image/jpeg"),
js("js","JavaScript","text/javascript"),
JSON("json","JSON格式","application/json"),
JSONLD("jsonld","JSON-LD格式","application/ld+json"),
MID("mid","乐器数字接口（MIDI）","audio/midi"),
MIDI("midi","乐器数字接口（MIDI）","audio/midi"),
MJS("mjs","JavaScript模块","text/javascript"),
MP3("mp3","MP3音频","audio/mpeg"),
MPEG("mpeg","MPEG视频","video/mpeg"),
MPKG("mpkg","苹果安装程序包","application/vnd.apple.installer+xml"),
ODP("odp","OpenDocument演示文稿文档","application/vnd.oasis.opendocument.presentation"),
ODS("ods","OpenDocument电子表格文档","application/vnd.oasis.opendocument.spreadsheet"),
ODT("odt","OpenDocument文字文件","application/vnd.oasis.opendocument.text"),
OGA("oga","OGG音讯","audio/ogg"),
OGV("ogv","OGG视频","video/ogg"),
OGX("ogx","OGG","application/ogg"),
OPUS("opus","OPUS音频","audio/opus"),
OTF("otf","otf字体","font/otf"),
PNG("png","便携式网络图形","image/png"),
PDF("pdf","Adobe可移植文档格式（PDF）","application/pdf"),
PHP("php","php","application/x-httpd-php"),
PPT("ppt","MicrosoftPowerPoint","application/vnd.ms-powerpoint"),
PPTX("pptx","MicrosoftPowerPoint（OpenXML）","application/vnd.openxmlformats-officedocument.presentationml.presentation"),
RAR("rar","RAR档案","application/vnd.rar"),
RTF("rtf","富文本格式","application/rtf"),
SH("sh","BourneShell脚本","application/x-sh"),
SVG("svg","可缩放矢量图形（SVG）","image/svg+xml"),
SWF("swf","小型Web格式（SWF）或AdobeFlash文档","application/x-shockwave-flash"),
TAR("tar","磁带存档（TAR）","application/x-tar"),
TIF("tif","标记图像文件格式（TIFF）","image/tiff"),
TIFF("tiff","标记图像文件格式（TIFF）","image/tiff"),
TS("ts","MPEG传输流","video/mp2t"),
TTF("ttf","ttf字体","font/ttf"),
TXT("txt","文本（通常为ASCII或ISO8859-n","text/plain"),
VSD("vsd","微软Visio","application/vnd.visio"),
WAV("wav","波形音频格式","audio/wav"),
WEBA("weba","WEBM音频","audio/webm"),
WEBM("webm","WEBM视频","video/webm"),
WEBP("webp","WEBP图像","image/webp"),
WOFF("woff","Web开放字体格式（WOFF）","font/woff"),
WOFF2("woff2","Web开放字体格式（WOFF）","font/woff2"),
XHTML("xhtml","XHTML","application/xhtml+xml"),
XLS("xls","微软excel","application/vnd.ms-excel"),
XLSX("xlsx","微软Excel（OpenXML）","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"),
XML("xml","XML","application/xml"),
XUL("xul","XUL","application/vnd.mozilla.xul+xml"),
ZIP("zip","ZIP","application/zip"),
MIME_3GP("3gp","3GPPaudio/videocontainer","video/3gpp"),
MIME_3GP_WITHOUT_VIDEO("3gp","3GPPaudio/videocontainerdoesn'tcontainvideo","audio/3gpp2"),
MIME_3G2("3g2","3GPP2audio/videocontainer","video/3gpp2"),
MIME_3G2_WITHOUT_VIDEO("3g2","3GPP2audio/videocontainerdoesn'tcontainvideo","audio/3gpp2"),
MIME_7Z("7z","7-zip存档","application/x-7z-compressed");

//扩展名
privatefinalStringextension;
//说明
privatefinalStringexplain;
//contentType/mime类型
privatefinalStringmimeType;

/**
*@paramextension上传的文件扩展名
*@paramexplain类型说明
*@parammimeTypeMime对应的类型
*/
MimeTypeEnum(Stringextension,Stringexplain,StringmimeType){
this.extension=extension;
this.explain=explain;
this.mimeType=mimeType;
}

/**
*通过扩展名获取枚举类型
*
*@paramextension扩展名
*@return枚举类
*/
publicstaticMimeTypeEnumgetByExtension(Stringextension){
if(StringUtils.isEmpty(extension)){
returnnull;
}
for(MimeTypeEnumtypesEnum:MimeTypeEnum.values()){
if(extension.equals(typesEnum.getExtension())){
returntypesEnum;
}
}
returnnull;
}

/**
*Content-Type常用对照
*根据后缀获取Mime
*
*@paramfileType扩展名
*@returnmime类型
*/
publicstaticStringgetContentType(StringfileType){
MimeTypeEnummimeTypeEnum=MimeTypeEnum.getByExtension(fileType);
if(mimeTypeEnum!=null){
returnmimeTypeEnum.getMimeType();
}
return"application/octet-stream";
}

}

根据文件获取MimeType的几种方式

<!--hutool-all-->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.6.5</version>
</dependency>
<!--commons.lang3-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.7</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.79</version>
</dependency>
<dependency>
<groupId>net.sf.jmimemagic</groupId>
<artifactId>jmimemagic</artifactId>
<version>0.1.4</version>
</dependency>

importcn.hutool.core.io.FileUtil;
importnet.sf.jmimemagic.*;

importjavax.activation.MimetypesFileTypeMap;
importjava.io.File;
importjava.io.IOException;
importjava.net.FileNameMap;
importjava.net.URLConnection;
importjava.nio.file.Files;

publicclassMimeTypeDemo{

publicstaticvoidmain(String[]args){
Filefile=FileUtil.file("d:/001.jpg");
//第一种方式
StringmimeType1="";
try{
Magicparser=newMagic();
MagicMatchmatch=parser.getMagicMatch(file,false);
mimeType1=match.getMimeType();
}catch(MagicParseExceptione){
e.printStackTrace();
}catch(MagicMatchNotFoundExceptione){
e.printStackTrace();
}catch(MagicExceptione){
e.printStackTrace();
}
System.out.println("第一种方式:"+mimeType1);
//第二种方式
StringmimeType2=newMimetypesFileTypeMap().getContentType(file);
System.out.println("第二种方式:"+mimeType2);
//第三种方式
StringmimeType3="";
try{
mimeType3=Files.probeContentType(file.toPath());
}catch(IOExceptione){
e.printStackTrace();
}
System.out.println("第三种方式:"+mimeType3);
//第四种方式
FileNameMapfileNameMap=URLConnection.getFileNameMap();
StringmimeType4=fileNameMap.getContentTypeFor(file.getParent());
System.out.println("第四种方式:"+mimeType4);

//通过文件扩展名获取ContentType
MimeTypeEnummimeTypeEnum=MimeTypeEnum.getByExtension("jpg");
System.out.println(mimeTypeEnum.getExplain()+","+mimeTypeEnum.getMimeType()+","+mimeTypeEnum.getExtension());
}

}

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