HTML实现在线预览Excel,word,ppt

使用office提供的在线预览功能

https://view.officeapps.live....

src后面接你需要预览的文件下载地址.

如果不能实现预览功能,提示报错

请检查http返回的Content-Type是否正确

当从浏览器返回一个文件时,需要指定ContentType,以下是Office2007对应的值:

"application/vnd.openxmlformats-officedocument.wordprocessingml.template" (for .dotx files)

"application/vnd.openxmlformats-officedocument.presentationml.presentation" (for .pptx files)

"application/vnd.openxmlformats-officedocument.presentationml.slideshow" (for .ppsx files)

"application/vnd.openxmlformats-officedocument.presentationml.template" (for .potx files)

"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" (for .xlsx files)

"application/vnd.openxmlformats-officedocument.spreadsheetml.template" (for .xltx files)

参考链接:

https://www.cnblogs.com/huang...

office在线预览文档: https://products.office.com/z...

office文件对应的contentType: https://www.cnblogs.com/diony...

bug解决记录:

原来网站中有个需要,是下载Excel.

最开始实现的时候,是使用jsreport来实现,但是该服务收费,并且由于功能太强大了,学习成本高.

因为我们只是想要下载Excel,后面就找了Excel.js这个库来实现.

下载Excel是没问题,生成文件流以后,,直接返回steam,有一天,领导说,需要在线预览Excel:fearful:

考虑过几种方案,

1. 自己实现解析Excel,直接以表格的样式返回HTML
2. 找第三方js库,来实现Excel预览,
3. 其他(尽可能少改动现有代码)

在找其他方案的时候,发现,其他Microsoft Office365提供了在线预览的功能,只需要

https://view.officeapps.live....

src后面跟上Excel的下载地址就行.

但是测试了一下,发现并不能成功.因为我们服务器上通过接口下载Excel的URL拼接在上面src后面,不能预览,会报错.

但是,如果是访问静态资源目录,拼接在src后面,是可以的.

比如: http://a.com/excel.xlsx 可以在线预览

https://a.com/download/report... 不能在线预览

我就怀疑是response Header设置问题,但是,不清楚具体是哪个配置项.

最开始以为是https的问题,但是测试后发现,与https无关,https和http协议都能在线预览

也考虑过是不是URL上没用后缀,导致office无法识别该文件是什么类型,但是下载保存的时候,会自动识别出对应的文件后缀名,所以就肯定不是URL上没有后缀名导致的问题.

服务器后端使用的是Node.js,框架用的是express,如果将Excel放置在静态资源文件目录下,是能正常预览.

如果是将文件放在静态资源文件夹下访问,等同于调用express中的res.sendFile(filePath)方法.

我们的接口中,使用

res.set({
    'Content-Disposition': 'Attachment; filename="report.xlsx'
});

来设置response的header,保证用户下载文件后存储到本地时默认是Excel后缀.

好,因为基础知识不牢,只能去查看express的源码中sendFile()方法有什么奥秘了

node_modules/express/lib/response.js

res.sendFile = function sendFile(path, options, callback) {
  var done = callback;
  var req = this.req;
  var res = this;
  var next = req.next;
  var opts = options || {};

  if (!path) {
    throw new TypeError('path argument is required to res.sendFile');
  }

  // support function as second arg
  if (typeof options === 'function') {
    done = options;
    opts = {};
  }

  if (!opts.root && !isAbsolute(path)) {
    throw new TypeError('path must be absolute or specify root to res.sendFile');
  }

  // create file stream
  var pathname = encodeURI(path);
  var file = send(req, pathname, opts);

  // transfer
  sendfile(res, file, opts, function (err) {
    if (done) return done(err);
    if (err && err.code === 'EISDIR') return next();

    // next() all but write errors
    if (err && err.code !== 'ECONNABORTED' && err.syscall !== 'write') {
      next(err);
    }
  });
};

可以看到,实际上sendFile调用的是 node_modules/send/index.js 方法,

在看send模块中的代码,发现

var mime = require('mime')

SendStream.prototype.type = function type (path) {
  var res = this.res

  if (res.getHeader('Content-Type')) return

  var type = mime.lookup(path)

  if (!type) {
    debug('no content-type')
    return
  }

  var charset = mime.charsets.lookup(type)

  debug('content-type %s', type)
  res.setHeader('Content-Type', type + (charset ? '; charset=' + charset : ''))
}

express在发送文件时,会调用上述代码,根据后缀名来获取Content-Type.

在查看mime的源码,会发现在mime中,require了一个type.json,而type.json就是各种后缀名对应的content-type

因为我们原来的代码中,只设置了Content-Disposition,代表该请求返回的是一个文件.

但是office365实际上是通过Content-Type来获取,当前需要预览的是什么类型的文件(word,ppt,Excel),所以,需要设置对应的Content-Type才能正确实现预览功能

mime库中type.json中后缀名对应的ContentType,可以用来做速查表

{
  "application/andrew-inset": [
    "ez"
  ],
  "application/applixware": [
    "aw"
  ],
  "application/atom+xml": [
    "atom"
  ],
  "application/atomcat+xml": [
    "atomcat"
  ],
  "application/atomsvc+xml": [
    "atomsvc"
  ],
  "application/bdoc": [
    "bdoc"
  ],
  "application/ccxml+xml": [
    "ccxml"
  ],
  "application/cdmi-capability": [
    "cdmia"
  ],
  "application/cdmi-container": [
    "cdmic"
  ],
  "application/cdmi-domain": [
    "cdmid"
  ],
  "application/cdmi-object": [
    "cdmio"
  ],
  "application/cdmi-queue": [
    "cdmiq"
  ],
  "application/cu-seeme": [
    "cu"
  ],
  "application/dash+xml": [
    "mpd"
  ],
  "application/davmount+xml": [
    "davmount"
  ],
  "application/docbook+xml": [
    "dbk"
  ],
  "application/dssc+der": [
    "dssc"
  ],
  "application/dssc+xml": [
    "xdssc"
  ],
  "application/ecmascript": [
    "ecma"
  ],
  "application/emma+xml": [
    "emma"
  ],
  "application/epub+zip": [
    "epub"
  ],
  "application/exi": [
    "exi"
  ],
  "application/font-tdpfr": [
    "pfr"
  ],
  "application/font-woff": [
    "woff"
  ],
  "application/font-woff2": [
    "woff2"
  ],
  "application/geo+json": [
    "geojson"
  ],
  "application/gml+xml": [
    "gml"
  ],
  "application/gpx+xml": [
    "gpx"
  ],
  "application/gxf": [
    "gxf"
  ],
  "application/gzip": [
    "gz"
  ],
  "application/hyperstudio": [
    "stk"
  ],
  "application/inkml+xml": [
    "ink",
    "inkml"
  ],
  "application/ipfix": [
    "ipfix"
  ],
  "application/java-archive": [
    "jar",
    "war",
    "ear"
  ],
  "application/java-serialized-object": [
    "ser"
  ],
  "application/java-vm": [
    "class"
  ],
  "application/javascript": [
    "js",
    "mjs"
  ],
  "application/json": [
    "json",
    "map"
  ],
  "application/json5": [
    "json5"
  ],
  "application/jsonml+json": [
    "jsonml"
  ],
  "application/ld+json": [
    "jsonld"
  ],
  "application/lost+xml": [
    "lostxml"
  ],
  "application/mac-binhex40": [
    "hqx"
  ],
  "application/mac-compactpro": [
    "cpt"
  ],
  "application/mads+xml": [
    "mads"
  ],
  "application/manifest+json": [
    "webmanifest"
  ],
  "application/marc": [
    "mrc"
  ],
  "application/marcxml+xml": [
    "mrcx"
  ],
  "application/mathematica": [
    "ma",
    "nb",
    "mb"
  ],
  "application/mathml+xml": [
    "mathml"
  ],
  "application/mbox": [
    "mbox"
  ],
  "application/mediaservercontrol+xml": [
    "mscml"
  ],
  "application/metalink+xml": [
    "metalink"
  ],
  "application/metalink4+xml": [
    "meta4"
  ],
  "application/mets+xml": [
    "mets"
  ],
  "application/mods+xml": [
    "mods"
  ],
  "application/mp21": [
    "m21",
    "mp21"
  ],
  "application/mp4": [
    "mp4s",
    "m4p"
  ],
  "application/msword": [
    "doc",
    "dot"
  ],
  "application/mxf": [
    "mxf"
  ],
  "application/octet-stream": [
    "bin",
    "dms",
    "lrf",
    "mar",
    "so",
    "dist",
    "distz",
    "pkg",
    "bpk",
    "dump",
    "elc",
    "deploy",
    "exe",
    "dll",
    "deb",
    "dmg",
    "iso",
    "img",
    "msi",
    "msp",
    "msm",
    "buffer"
  ],
  "application/oda": [
    "oda"
  ],
  "application/oebps-package+xml": [
    "opf"
  ],
  "application/ogg": [
    "ogx"
  ],
  "application/omdoc+xml": [
    "omdoc"
  ],
  "application/onenote": [
    "onetoc",
    "onetoc2",
    "onetmp",
    "onepkg"
  ],
  "application/oxps": [
    "oxps"
  ],
  "application/patch-ops-error+xml": [
    "xer"
  ],
  "application/pdf": [
    "pdf"
  ],
  "application/pgp-encrypted": [
    "pgp"
  ],
  "application/pgp-signature": [
    "asc",
    "sig"
  ],
  "application/pics-rules": [
    "prf"
  ],
  "application/pkcs10": [
    "p10"
  ],
  "application/pkcs7-mime": [
    "p7m",
    "p7c"
  ],
  "application/pkcs7-signature": [
    "p7s"
  ],
  "application/pkcs8": [
    "p8"
  ],
  "application/pkix-attr-cert": [
    "ac"
  ],
  "application/pkix-cert": [
    "cer"
  ],
  "application/pkix-crl": [
    "crl"
  ],
  "application/pkix-pkipath": [
    "pkipath"
  ],
  "application/pkixcmp": [
    "pki"
  ],
  "application/pls+xml": [
    "pls"
  ],
  "application/postscript": [
    "ai",
    "eps",
    "ps"
  ],
  "application/prs.cww": [
    "cww"
  ],
  "application/pskc+xml": [
    "pskcxml"
  ],
  "application/rdf+xml": [
    "rdf"
  ],
  "application/reginfo+xml": [
    "rif"
  ],
  "application/relax-ng-compact-syntax": [
    "rnc"
  ],
  "application/resource-lists+xml": [
    "rl"
  ],
  "application/resource-lists-diff+xml": [
    "rld"
  ],
  "application/rls-services+xml": [
    "rs"
  ],
  "application/rpki-ghostbusters": [
    "gbr"
  ],
  "application/rpki-manifest": [
    "mft"
  ],
  "application/rpki-roa": [
    "roa"
  ],
  "application/rsd+xml": [
    "rsd"
  ],
  "application/rss+xml": [
    "rss"
  ],
  "application/rtf": [
    "rtf"
  ],
  "application/sbml+xml": [
    "sbml"
  ],
  "application/scvp-cv-request": [
    "scq"
  ],
  "application/scvp-cv-response": [
    "scs"
  ],
  "application/scvp-vp-request": [
    "spq"
  ],
  "application/scvp-vp-response": [
    "spp"
  ],
  "application/sdp": [
    "sdp"
  ],
  "application/set-payment-initiation": [
    "setpay"
  ],
  "application/set-registration-initiation": [
    "setreg"
  ],
  "application/shf+xml": [
    "shf"
  ],
  "application/smil+xml": [
    "smi",
    "smil"
  ],
  "application/sparql-query": [
    "rq"
  ],
  "application/sparql-results+xml": [
    "srx"
  ],
  "application/srgs": [
    "gram"
  ],
  "application/srgs+xml": [
    "grxml"
  ],
  "application/sru+xml": [
    "sru"
  ],
  "application/ssdl+xml": [
    "ssdl"
  ],
  "application/ssml+xml": [
    "ssml"
  ],
  "application/tei+xml": [
    "tei",
    "teicorpus"
  ],
  "application/thraud+xml": [
    "tfi"
  ],
  "application/timestamped-data": [
    "tsd"
  ],
  "application/vnd.3gpp.pic-bw-large": [
    "plb"
  ],
  "application/vnd.3gpp.pic-bw-small": [
    "psb"
  ],
  "application/vnd.3gpp.pic-bw-var": [
    "pvb"
  ],
  "application/vnd.3gpp2.tcap": [
    "tcap"
  ],
  "application/vnd.3m.post-it-notes": [
    "pwn"
  ],
  "application/vnd.accpac.simply.aso": [
    "aso"
  ],
  "application/vnd.accpac.simply.imp": [
    "imp"
  ],
  "application/vnd.acucobol": [
    "acu"
  ],
  "application/vnd.acucorp": [
    "atc",
    "acutc"
  ],
  "application/vnd.adobe.air-application-installer-package+zip": [
    "air"
  ],
  "application/vnd.adobe.formscentral.fcdt": [
    "fcdt"
  ],
  "application/vnd.adobe.fxp": [
    "fxp",
    "fxpl"
  ],
  "application/vnd.adobe.xdp+xml": [
    "xdp"
  ],
  "application/vnd.adobe.xfdf": [
    "xfdf"
  ],
  "application/vnd.ahead.space": [
    "ahead"
  ],
  "application/vnd.airzip.filesecure.azf": [
    "azf"
  ],
  "application/vnd.airzip.filesecure.azs": [
    "azs"
  ],
  "application/vnd.amazon.ebook": [
    "azw"
  ],
  "application/vnd.americandynamics.acc": [
    "acc"
  ],
  "application/vnd.amiga.ami": [
    "ami"
  ],
  "application/vnd.android.package-archive": [
    "apk"
  ],
  "application/vnd.anser-web-certificate-issue-initiation": [
    "cii"
  ],
  "application/vnd.anser-web-funds-transfer-initiation": [
    "fti"
  ],
  "application/vnd.antix.game-component": [
    "atx"
  ],
  "application/vnd.apple.installer+xml": [
    "mpkg"
  ],
  "application/vnd.apple.mpegurl": [
    "m3u8"
  ],
  "application/vnd.apple.pkpass": [
    "pkpass"
  ],
  "application/vnd.aristanetworks.swi": [
    "swi"
  ],
  "application/vnd.astraea-software.iota": [
    "iota"
  ],
  "application/vnd.audiograph": [
    "aep"
  ],
  "application/vnd.blueice.multipass": [
    "mpm"
  ],
  "application/vnd.bmi": [
    "bmi"
  ],
  "application/vnd.businessobjects": [
    "rep"
  ],
  "application/vnd.chemdraw+xml": [
    "cdxml"
  ],
  "application/vnd.chipnuts.karaoke-mmd": [
    "mmd"
  ],
  "application/vnd.cinderella": [
    "cdy"
  ],
  "application/vnd.claymore": [
    "cla"
  ],
  "application/vnd.cloanto.rp9": [
    "rp9"
  ],
  "application/vnd.clonk.c4group": [
    "c4g",
    "c4d",
    "c4f",
    "c4p",
    "c4u"
  ],
  "application/vnd.cluetrust.cartomobile-config": [
    "c11amc"
  ],
  "application/vnd.cluetrust.cartomobile-config-pkg": [
    "c11amz"
  ],
  "application/vnd.commonspace": [
    "csp"
  ],
  "application/vnd.contact.cmsg": [
    "cdbcmsg"
  ],
  "application/vnd.cosmocaller": [
    "cmc"
  ],
  "application/vnd.crick.clicker": [
    "clkx"
  ],
  "application/vnd.crick.clicker.keyboard": [
    "clkk"
  ],
  "application/vnd.crick.clicker.palette": [
    "clkp"
  ],
  "application/vnd.crick.clicker.template": [
    "clkt"
  ],
  "application/vnd.crick.clicker.wordbank": [
    "clkw"
  ],
  "application/vnd.criticaltools.wbs+xml": [
    "wbs"
  ],
  "application/vnd.ctc-posml": [
    "pml"
  ],
  "application/vnd.cups-ppd": [
    "ppd"
  ],
  "application/vnd.curl.car": [
    "car"
  ],
  "application/vnd.curl.pcurl": [
    "pcurl"
  ],
  "application/vnd.dart": [
    "dart"
  ],
  "application/vnd.data-vision.rdz": [
    "rdz"
  ],
  "application/vnd.dece.data": [
    "uvf",
    "uvvf",
    "uvd",
    "uvvd"
  ],
  "application/vnd.dece.ttml+xml": [
    "uvt",
    "uvvt"
  ],
  "application/vnd.dece.unspecified": [
    "uvx",
    "uvvx"
  ],
  "application/vnd.dece.zip": [
    "uvz",
    "uvvz"
  ],
  "application/vnd.denovo.fcselayout-link": [
    "fe_launch"
  ],
  "application/vnd.dna": [
    "dna"
  ],
  "application/vnd.dolby.mlp": [
    "mlp"
  ],
  "application/vnd.dpgraph": [
    "dpg"
  ],
  "application/vnd.dreamfactory": [
    "dfac"
  ],
  "application/vnd.ds-keypoint": [
    "kpxx"
  ],
  "application/vnd.dvb.ait": [
    "ait"
  ],
  "application/vnd.dvb.service": [
    "svc"
  ],
  "application/vnd.dynageo": [
    "geo"
  ],
  "application/vnd.ecowin.chart": [
    "mag"
  ],
  "application/vnd.enliven": [
    "nml"
  ],
  "application/vnd.epson.esf": [
    "esf"
  ],
  "application/vnd.epson.msf": [
    "msf"
  ],
  "application/vnd.epson.quickanime": [
    "qam"
  ],
  "application/vnd.epson.salt": [
    "slt"
  ],
  "application/vnd.epson.ssf": [
    "ssf"
  ],
  "application/vnd.eszigno3+xml": [
    "es3",
    "et3"
  ],
  "application/vnd.ezpix-album": [
    "ez2"
  ],
  "application/vnd.ezpix-package": [
    "ez3"
  ],
  "application/vnd.fdf": [
    "fdf"
  ],
  "application/vnd.fdsn.mseed": [
    "mseed"
  ],
  "application/vnd.fdsn.seed": [
    "seed",
    "dataless"
  ],
  "application/vnd.flographit": [
    "gph"
  ],
  "application/vnd.fluxtime.clip": [
    "ftc"
  ],
  "application/vnd.framemaker": [
    "fm",
    "frame",
    "maker",
    "book"
  ],
  "application/vnd.frogans.fnc": [
    "fnc"
  ],
  "application/vnd.frogans.ltf": [
    "ltf"
  ],
  "application/vnd.fsc.weblaunch": [
    "fsc"
  ],
  "application/vnd.fujitsu.oasys": [
    "oas"
  ],
  "application/vnd.fujitsu.oasys2": [
    "oa2"
  ],
  "application/vnd.fujitsu.oasys3": [
    "oa3"
  ],
  "application/vnd.fujitsu.oasysgp": [
    "fg5"
  ],
  "application/vnd.fujitsu.oasysprs": [
    "bh2"
  ],
  "application/vnd.fujixerox.ddd": [
    "ddd"
  ],
  "application/vnd.fujixerox.docuworks": [
    "xdw"
  ],
  "application/vnd.fujixerox.docuworks.binder": [
    "xbd"
  ],
  "application/vnd.fuzzysheet": [
    "fzs"
  ],
  "application/vnd.genomatix.tuxedo": [
    "txd"
  ],
  "application/vnd.geogebra.file": [
    "ggb"
  ],
  "application/vnd.geogebra.tool": [
    "ggt"
  ],
  "application/vnd.geometry-explorer": [
    "gex",
    "gre"
  ],
  "application/vnd.geonext": [
    "gxt"
  ],
  "application/vnd.geoplan": [
    "g2w"
  ],
  "application/vnd.geospace": [
    "g3w"
  ],
  "application/vnd.gmx": [
    "gmx"
  ],
  "application/vnd.google-apps.document": [
    "gdoc"
  ],
  "application/vnd.google-apps.presentation": [
    "gslides"
  ],
  "application/vnd.google-apps.spreadsheet": [
    "gsheet"
  ],
  "application/vnd.google-earth.kml+xml": [
    "kml"
  ],
  "application/vnd.google-earth.kmz": [
    "kmz"
  ],
  "application/vnd.grafeq": [
    "gqf",
    "gqs"
  ],
  "application/vnd.groove-account": [
    "gac"
  ],
  "application/vnd.groove-help": [
    "ghf"
  ],
  "application/vnd.groove-identity-message": [
    "gim"
  ],
  "application/vnd.groove-injector": [
    "grv"
  ],
  "application/vnd.groove-tool-message": [
    "gtm"
  ],
  "application/vnd.groove-tool-template": [
    "tpl"
  ],
  "application/vnd.groove-vcard": [
    "vcg"
  ],
  "application/vnd.hal+xml": [
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  ],
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  ]
}