vsd格式用什么文件（vsd文件编辑方式）

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

import lombok.getter;
import org.apache.commons.lang3.stringutils;

/**
 * 通过文件扩展名获取contenttype
 */
@getter
public enum mimetypeenum {

    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", "windows os / 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", "microsoft word（openxml）", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"),
    eot("eot", "ms embedded opentype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", "microsoft powerpoint", "application/vnd.ms-powerpoint"),
    pptx("pptx", "microsoft powerpoint（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", "bourne shell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adobe flash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iso 8859- 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", "3gpp audio/video container", "video/3gpp"),
    mime_3gp_without_video("3gp", "3gpp audio/video container doesn't contain video", "audio/3gpp2"),
    mime_3g2("3g2", "3gpp2 audio/video container", "video/3gpp2"),
    mime_3g2_without_video("3g2", "3gpp2 audio/video container  doesn't contain video", "audio/3gpp2"),
    mime_7z("7z", "7-zip存档", "application/x-7z-compressed");

    //扩展名
    private final string extension;
    //说明
    private final string explain;
    //contenttype/mime类型
    private final string mimetype;

    /**
     * @param extension 上传的文件扩展名
     * @param explain   类型说明
     * @param mimetype  mime对应的类型
     */
    mimetypeenum(string extension, string explain, string mimetype) {
        this.extension = extension;
        this.explain = explain;
        this.mimetype = mimetype;
    }

    /**
     * 通过扩展名获取枚举类型
     *
     * @param extension 扩展名
     * @return 枚举类
     */
    public static mimetypeenum getbyextension(string extension) {
        if (stringutils.isempty(extension)) {
            return null;
        }
        for (mimetypeenum typesenum : mimetypeenum.values()) {
            if (extension.equals(typesenum.getextension())) {
                return typesenum;
            }
        }
        return null;
    }

    /**
     * content-type常用对照
     * 根据后缀获取mime
     *
     * @param filetype 扩展名
     * @return mime类型
     */
    public static string getcontenttype(string filetype) {
        mimetypeenum mimetypeenum = mimetypeenum.getbyextension(filetype);
        if (mimetypeenum != null) {
            return mimetypeenum.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>

import cn.hutool.core.io.fileutil;
import net.sf.jmimemagic.*;

import javax.activation.mimetypesfiletypemap;
import java.io.file;
import java.io.ioexception;
import java.net.filenamemap;
import java.net.urlconnection;
import java.nio.file.files;

public class mimetypedemo {

    public static void main(string[] args) {
        file file = fileutil.file("d:/001.jpg");
        // 第一种方式
        string mimetype1 = "";
        try {
            magic parser = new magic();
            magicmatch match = parser.getmagicmatch(file, false);
            mimetype1 = match.getmimetype();
        } catch (magicparseexception e) {
            e.printstacktrace();
        } catch (magicmatchnotfoundexception e) {
            e.printstacktrace();
        } catch (magicexception e) {
            e.printstacktrace();
        }
        system.out.println("第一种方式: " + mimetype1);
        // 第二种方式
        string mimetype2 = new mimetypesfiletypemap().getcontenttype(file);
        system.out.println("第二种方式: " + mimetype2);
        // 第三种方式
        string mimetype3 = "";
        try {
            mimetype3 = files.probecontenttype(file.topath());
        } catch (ioexception e) {
            e.printstacktrace();
        }
        system.out.println("第三种方式: " + mimetype3);
        //  第四种方式
        filenamemap filenamemap = urlconnection.getfilenamemap();
        string mimetype4 = filenamemap.getcontenttypefor(file.getparent());
        system.out.println("第四种方式: " + mimetype4);

        // 通过文件扩展名获取contenttype
        mimetypeenum mimetypeenum = mimetypeenum.getbyextension("jpg");
        system.out.println(mimetypeenum.getexplain()+ " , "+mimetypeenum.getmimetype()+ " , "+mimetypeenum.getextension());
    }

}