什么是Web服务器

Web服务器一般是指网站服务器，即网上的某种计算机程序，可以向浏览器等客户端提供文档，也可以放置网站文件让全世界浏览，还可以放置数据文件提供下载。目前最主流的Web服务器有Apache、Nginx、IIS等。

目标

本片文章的主要目标是让读者学会：
1、如何让我们可以访问web服务器上面的网站
2、如何让我们可以下载web服务器上的文件

1. 访问web服务器上面的网站

1.1 创建服务器

输入nth，提示node-http-server，回车：

var http = require('http');
http.createServer(function (request, response) {response.writeHead(200, {'Content-Type': 'text/plain'});response.end('Hello World');
}).listen(8081);console.log('Server running at http://127.0.0.1:8081/');

稍作修改，改成es语法，端口修改成不重复的，甚至响应头，并且读取一下请求路径做下过滤：

var http = require('http');
http.createServer((req, res)=>{// 1.获取地址let pathname = req.url// 过滤网站tab图标请求if(pathname !== '/favicon.ico'){console.log(pathname)// 设置响应头res.writeHead(200, {'Content-Type': 'text/html;charset="utf-8"'});res.end('Hello World');}
}).listen(3000);console.log('Server running at http://127.0.0.1:3000/');

1.2 读取服务器上的资源文件

创建demo10项目，static文件夹下是网页的静态资源，其中，index.html文件引用到了css、img下的文件（详细的样式和图片资源并不重要，可以随便写，这里只是为了说明多文件的读取问题）。

index.html代码：

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><link rel="stylesheet" href="./css/index.css"><title>Document</title>
</head><body><div class="hello">你好</div><img src="./img/test.jpg" alt="测试图片">
</body></html>

如果本地直接双击打开，效果是这样滴：

现在我们要做的就是如何通过nodejs读取html及其引用的文件，并显示在服务器中。具体代码如下，app.js:

// 创建一个web服务器
// 1.可以访问web服务器上的网站
// 2.可以下载web服务器上的文件
const http = require('http');
const fs = require('fs')
const common = require('./module/common.js')
const path = require('path')// common.gtFileMine('.css')
http.createServer(function (req, res) {// 1.获取地址let pathname = req.url// 解析地址，除去地址?后的字符pathname = (pathname.split('?'))[0]// 默认加载页面pathname = pathname === '/'?'/index.html':pathname// 获取文件后缀let extname = path.extname(pathname)// 2.通过fs模块读取文件if(pathname !== '/favicon.ico'){console.log(pathname)// console.log(req)fs.readFile('./static' + pathname,(err,data)=>{if(err){res.writeHead(404, {'Content-Type': 'text/html;charset="utf-8"'});res.end('这个页面不存在');}// 根据路径后缀返回content-type// let mime = common.getMime(extname);let mime = common.gtFileMine(extname);res.writeHead(200, {'Content-Type': ''+ mime +';charset="utf-8"'});// 3.返回路径下文件的内容res.end(data);})}
}).listen(3000);console.log('Server running at http://127.0.0.1:3000/');

nodemon app.js 启动项目：

简要说明下app.js代码思路：
（1）进入到 http://127.0.0.1:3000/ ，默认加载static文件夹下的index.html文件
（2）加载index.html文件后，浏览器继续加载里面引用到的样式和图片等资源，对这些资源进行content-type的区分，如果继续使用res.writeHead(404, {'Content-Type': 'text/html;charset="utf-8"'});就无法正确加载除了html之外的资源文件。
（3）gtFileMine方法用于获取资源文件对应的资源类型，mime.json文件是所有资源文件对应的资源类型。

module/common.js：

const fs = require('fs')exports.getMime = function(extname){switch(extname){case '.html':return 'text/html';case '.css':return 'text/css';case '.js':return 'text/javascript';default:return 'text/html'  }
}exports.gtFileMine = function(extname){// 同步获取数据let data = fs.readFileSync('./data/mime.json')let mimeObj = JSON.parse(data.toString())// 变量名属性只能通过数组的形式进行访问console.log(mimeObj[extname])return mimeObj[extname]
}

data/mime.json:


{ ".323":"text/h323" ,".3gp":"video/3gpp" ,".aab":"application/x-authoware-bin" ,".aam":"application/x-authoware-map" ,".aas":"application/x-authoware-seg" ,".acx":"application/internet-property-stream" ,".ai":"application/postscript" ,".aif":"audio/x-aiff" ,".aifc":"audio/x-aiff" ,".aiff":"audio/x-aiff" ,".als":"audio/X-Alpha5" ,".amc":"application/x-mpeg" ,".ani":"application/octet-stream" ,".apk":"application/vnd.android.package-archive" ,".asc":"text/plain" ,".asd":"application/astound" ,".asf":"video/x-ms-asf" ,".asn":"application/astound" ,".asp":"application/x-asap" ,".asr":"video/x-ms-asf" ,".asx":"video/x-ms-asf" ,".au":"audio/basic" ,".avb":"application/octet-stream" ,".avi":"video/x-msvideo" ,".awb":"audio/amr-wb" ,".axs":"application/olescript" ,".bas":"text/plain" ,".bcpio":"application/x-bcpio" ,".bin ":"application/octet-stream" ,".bld":"application/bld" ,".bld2":"application/bld2" ,".bmp":"image/bmp" ,".bpk":"application/octet-stream" ,".bz2":"application/x-bzip2" ,".c":"text/plain" ,".cal":"image/x-cals" ,".cat":"application/vnd.ms-pkiseccat" ,".ccn":"application/x-cnc" ,".cco":"application/x-cocoa" ,".cdf":"application/x-cdf" ,".cer":"application/x-x509-ca-cert" ,".cgi":"magnus-internal/cgi" ,".chat":"application/x-chat" ,".class":"application/octet-stream" ,".clp":"application/x-msclip" ,".cmx":"image/x-cmx" ,".co":"application/x-cult3d-object" ,".cod":"image/cis-cod" ,".conf":"text/plain" ,".cpio":"application/x-cpio" ,".cpp":"text/plain" ,".cpt":"application/mac-compactpro" ,".crd":"application/x-mscardfile" ,".crl":"application/pkix-crl" ,".crt":"application/x-x509-ca-cert" ,".csh":"application/x-csh" ,".csm":"chemical/x-csml" ,".csml":"chemical/x-csml" ,".css":"text/css" ,".cur":"application/octet-stream" ,".dcm":"x-lml/x-evm" ,".dcr":"application/x-director" ,".dcx":"image/x-dcx" ,".der":"application/x-x509-ca-cert" ,".dhtml":"text/html" ,".dir":"application/x-director" ,".dll":"application/x-msdownload" ,".dmg":"application/octet-stream" ,".dms":"application/octet-stream" ,".doc":"application/msword" ,".docx":"application/vnd.openxmlformats-officedocument.wordprocessingml.document" ,".dot":"application/msword" ,".dvi":"application/x-dvi" ,".dwf":"drawing/x-dwf" ,".dwg":"application/x-autocad" ,".dxf":"application/x-autocad" ,".dxr":"application/x-director" ,".ebk":"application/x-expandedbook" ,".emb":"chemical/x-embl-dl-nucleotide" ,".embl":"chemical/x-embl-dl-nucleotide" ,".eps":"application/postscript" ,".epub":"application/epub+zip" ,".eri":"image/x-eri" ,".es":"audio/echospeech" ,".esl":"audio/echospeech" ,".etc":"application/x-earthtime" ,".etx":"text/x-setext" ,".evm":"x-lml/x-evm" ,".evy":"application/envoy" ,".exe":"application/octet-stream" ,".fh4":"image/x-freehand" ,".fh5":"image/x-freehand" ,".fhc":"image/x-freehand" ,".fif":"application/fractals" ,".flr":"x-world/x-vrml" ,".flv":"flv-application/octet-stream" ,".fm":"application/x-maker" ,".fpx":"image/x-fpx" ,".fvi":"video/isivideo" ,".gau":"chemical/x-gaussian-input" ,".gca":"application/x-gca-compressed" ,".gdb":"x-lml/x-gdb" ,".gif":"image/gif" ,".gps":"application/x-gps" ,".gtar":"application/x-gtar" ,".gz":"application/x-gzip" ,".h":"text/plain" ,".hdf":"application/x-hdf" ,".hdm":"text/x-hdml" ,".hdml":"text/x-hdml" ,".hlp":"application/winhlp" ,".hqx":"application/mac-binhex40" ,".hta":"application/hta" ,".htc":"text/x-component" ,".htm":"text/html" ,".html":"text/html" ,".hts":"text/html" ,".htt":"text/webviewhtml" ,".ice":"x-conference/x-cooltalk" ,".ico":"image/x-icon" ,".ief":"image/ief" ,".ifm":"image/gif" ,".ifs":"image/ifs" ,".iii":"application/x-iphone" ,".imy":"audio/melody" ,".ins":"application/x-internet-signup" ,".ips":"application/x-ipscript" ,".ipx":"application/x-ipix" ,".isp":"application/x-internet-signup" ,".it":"audio/x-mod" ,".itz":"audio/x-mod" ,".ivr":"i-world/i-vrml" ,".j2k":"image/j2k" ,".jad":"text/vnd.sun.j2me.app-descriptor" ,".jam":"application/x-jam" ,".jar":"application/java-archive" ,".java":"text/plain" ,".jfif":"image/pipeg" ,".jnlp":"application/x-java-jnlp-file" ,".jpe":"image/jpeg" ,".jpeg":"image/jpeg" ,".jpg":"image/jpeg" ,".jpz":"image/jpeg" ,".js":"application/x-javascript" ,".jwc":"application/jwc" ,".kjx":"application/x-kjx" ,".lak":"x-lml/x-lak" ,".latex":"application/x-latex" ,".lcc":"application/fastman" ,".lcl":"application/x-digitalloca" ,".lcr":"application/x-digitalloca" ,".lgh":"application/lgh" ,".lha":"application/octet-stream" ,".lml":"x-lml/x-lml" ,".lmlpack":"x-lml/x-lmlpack" ,".log":"text/plain" ,".lsf":"video/x-la-asf" ,".lsx":"video/x-la-asf" ,".lzh":"application/octet-stream" ,".m13":"application/x-msmediaview" ,".m14":"application/x-msmediaview" ,".m15":"audio/x-mod" ,".m3u":"audio/x-mpegurl" ,".m3url":"audio/x-mpegurl" ,".m4a":"audio/mp4a-latm" ,".m4b":"audio/mp4a-latm" ,".m4p":"audio/mp4a-latm" ,".m4u":"video/vnd.mpegurl" ,".m4v":"video/x-m4v" ,".ma1":"audio/ma1" ,".ma2":"audio/ma2" ,".ma3":"audio/ma3" ,".ma5":"audio/ma5" ,".man":"application/x-troff-man" ,".map":"magnus-internal/imagemap" ,".mbd":"application/mbedlet" ,".mct":"application/x-mascot" ,".mdb":"application/x-msaccess" ,".mdz":"audio/x-mod" ,".me":"application/x-troff-me" ,".mel":"text/x-vmel" ,".mht":"message/rfc822" ,".mhtml":"message/rfc822" ,".mi":"application/x-mif" ,".mid":"audio/mid" ,".midi":"audio/midi" ,".mif":"application/x-mif" ,".mil":"image/x-cals" ,".mio":"audio/x-mio" ,".mmf":"application/x-skt-lbs" ,".mng":"video/x-mng" ,".mny":"application/x-msmoney" ,".moc":"application/x-mocha" ,".mocha":"application/x-mocha" ,".mod":"audio/x-mod" ,".mof":"application/x-yumekara" ,".mol":"chemical/x-mdl-molfile" ,".mop":"chemical/x-mopac-input" ,".mov":"video/quicktime" ,".movie":"video/x-sgi-movie" ,".mp2":"video/mpeg" ,".mp3":"audio/mpeg" ,".mp4":"video/mp4" ,".mpa":"video/mpeg" ,".mpc":"application/vnd.mpohun.certificate" ,".mpe":"video/mpeg" ,".mpeg":"video/mpeg" ,".mpg":"video/mpeg" ,".mpg4":"video/mp4" ,".mpga":"audio/mpeg" ,".mpn":"application/vnd.mophun.application" ,".mpp":"application/vnd.ms-project" ,".mps":"application/x-mapserver" ,".mpv2":"video/mpeg" ,".mrl":"text/x-mrml" ,".mrm":"application/x-mrm" ,".ms":"application/x-troff-ms" ,".msg":"application/vnd.ms-outlook" ,".mts":"application/metastream" ,".mtx":"application/metastream" ,".mtz":"application/metastream" ,".mvb":"application/x-msmediaview" ,".mzv":"application/metastream" ,".nar":"application/zip" ,".nbmp":"image/nbmp" ,".nc":"application/x-netcdf" ,".ndb":"x-lml/x-ndb" ,".ndwn":"application/ndwn" ,".nif":"application/x-nif" ,".nmz":"application/x-scream" ,".nokia-op-logo":"image/vnd.nok-oplogo-color" ,".npx":"application/x-netfpx" ,".nsnd":"audio/nsnd" ,".nva":"application/x-neva1" ,".nws":"message/rfc822" ,".oda":"application/oda" ,".ogg":"audio/ogg" ,".oom":"application/x-AtlasMate-Plugin" ,".p10":"application/pkcs10" ,".p12":"application/x-pkcs12" ,".p7b":"application/x-pkcs7-certificates" ,".p7c":"application/x-pkcs7-mime" ,".p7m":"application/x-pkcs7-mime" ,".p7r":"application/x-pkcs7-certreqresp" ,".p7s":"application/x-pkcs7-signature" ,".pac":"audio/x-pac" ,".pae":"audio/x-epac" ,".pan":"application/x-pan" ,".pbm":"image/x-portable-bitmap" ,".pcx":"image/x-pcx" ,".pda":"image/x-pda" ,".pdb":"chemical/x-pdb" ,".pdf":"application/pdf" ,".pfr":"application/font-tdpfr" ,".pfx":"application/x-pkcs12" ,".pgm":"image/x-portable-graymap" ,".pict":"image/x-pict" ,".pko":"application/ynd.ms-pkipko" ,".pm":"application/x-perl" ,".pma":"application/x-perfmon" ,".pmc":"application/x-perfmon" ,".pmd":"application/x-pmd" ,".pml":"application/x-perfmon" ,".pmr":"application/x-perfmon" ,".pmw":"application/x-perfmon" ,".png":"image/png" ,".pnm":"image/x-portable-anymap" ,".pnz":"image/png" ,".pot,":"application/vnd.ms-powerpoint" ,".ppm":"image/x-portable-pixmap" ,".pps":"application/vnd.ms-powerpoint" ,".ppt":"application/vnd.ms-powerpoint" ,".pptx":"application/vnd.openxmlformats-officedocument.presentationml.presentation" ,".pqf":"application/x-cprplayer" ,".pqi":"application/cprplayer" ,".prc":"application/x-prc" ,".prf":"application/pics-rules" ,".prop":"text/plain" ,".proxy":"application/x-ns-proxy-autoconfig" ,".ps":"application/postscript" ,".ptlk":"application/listenup" ,".pub":"application/x-mspublisher" ,".pvx":"video/x-pv-pvx" ,".qcp":"audio/vnd.qcelp" ,".qt":"video/quicktime" ,".qti":"image/x-quicktime" ,".qtif":"image/x-quicktime" ,".r3t":"text/vnd.rn-realtext3d" ,".ra":"audio/x-pn-realaudio" ,".ram":"audio/x-pn-realaudio" ,".rar":"application/octet-stream" ,".ras":"image/x-cmu-raster" ,".rc":"text/plain" ,".rdf":"application/rdf+xml" ,".rf":"image/vnd.rn-realflash" ,".rgb":"image/x-rgb" ,".rlf":"application/x-richlink" ,".rm":"audio/x-pn-realaudio" ,".rmf":"audio/x-rmf" ,".rmi":"audio/mid" ,".rmm":"audio/x-pn-realaudio" ,".rmvb":"audio/x-pn-realaudio" ,".rnx":"application/vnd.rn-realplayer" ,".roff":"application/x-troff" ,".rp":"image/vnd.rn-realpix" ,".rpm":"audio/x-pn-realaudio-plugin" ,".rt":"text/vnd.rn-realtext" ,".rte":"x-lml/x-gps" ,".rtf":"application/rtf" ,".rtg":"application/metastream" ,".rtx":"text/richtext" ,".rv":"video/vnd.rn-realvideo" ,".rwc":"application/x-rogerwilco" ,".s3m":"audio/x-mod" ,".s3z":"audio/x-mod" ,".sca":"application/x-supercard" ,".scd":"application/x-msschedule" ,".sct":"text/scriptlet" ,".sdf":"application/e-score" ,".sea":"application/x-stuffit" ,".setpay":"application/set-payment-initiation" ,".setreg":"application/set-registration-initiation" ,".sgm":"text/x-sgml" ,".sgml":"text/x-sgml" ,".sh":"application/x-sh" ,".shar":"application/x-shar" ,".shtml":"magnus-internal/parsed-html" ,".shw":"application/presentations" ,".si6":"image/si6" ,".si7":"image/vnd.stiwap.sis" ,".si9":"image/vnd.lgtwap.sis" ,".sis":"application/vnd.symbian.install" ,".sit":"application/x-stuffit" ,".skd":"application/x-Koan" ,".skm":"application/x-Koan" ,".skp":"application/x-Koan" ,".skt":"application/x-Koan" ,".slc":"application/x-salsa" ,".smd":"audio/x-smd" ,".smi":"application/smil" ,".smil":"application/smil" ,".smp":"application/studiom" ,".smz":"audio/x-smd" ,".snd":"audio/basic" ,".spc":"application/x-pkcs7-certificates" ,".spl":"application/futuresplash" ,".spr":"application/x-sprite" ,".sprite":"application/x-sprite" ,".sdp":"application/sdp" ,".spt":"application/x-spt" ,".src":"application/x-wais-source" ,".sst":"application/vnd.ms-pkicertstore" ,".stk":"application/hyperstudio" ,".stl":"application/vnd.ms-pkistl" ,".stm":"text/html" ,".svg":"image/svg+xml" ,".sv4cpio":"application/x-sv4cpio" ,".sv4crc":"application/x-sv4crc" ,".svf":"image/vnd" ,".svg":"image/svg+xml" ,".svh":"image/svh" ,".svr":"x-world/x-svr" ,".swf":"application/x-shockwave-flash" ,".swfl":"application/x-shockwave-flash" ,".t":"application/x-troff" ,".tad":"application/octet-stream" ,".talk":"text/x-speech" ,".tar":"application/x-tar" ,".taz":"application/x-tar" ,".tbp":"application/x-timbuktu" ,".tbt":"application/x-timbuktu" ,".tcl":"application/x-tcl" ,".tex":"application/x-tex" ,".texi":"application/x-texinfo" ,".texinfo":"application/x-texinfo" ,".tgz":"application/x-compressed" ,".thm":"application/vnd.eri.thm" ,".tif":"image/tiff" ,".tiff":"image/tiff" ,".tki":"application/x-tkined" ,".tkined":"application/x-tkined" ,".toc":"application/toc" ,".toy":"image/toy" ,".tr":"application/x-troff" ,".trk":"x-lml/x-gps" ,".trm":"application/x-msterminal" ,".tsi":"audio/tsplayer" ,".tsp":"application/dsptype" ,".tsv":"text/tab-separated-values" ,".ttf":"application/octet-stream" ,".ttz":"application/t-time" ,".txt":"text/plain" ,".uls":"text/iuls" ,".ult":"audio/x-mod" ,".ustar":"application/x-ustar" ,".uu":"application/x-uuencode" ,".uue":"application/x-uuencode" ,".vcd":"application/x-cdlink" ,".vcf":"text/x-vcard" ,".vdo":"video/vdo" ,".vib":"audio/vib" ,".viv":"video/vivo" ,".vivo":"video/vivo" ,".vmd":"application/vocaltec-media-desc" ,".vmf":"application/vocaltec-media-file" ,".vmi":"application/x-dreamcast-vms-info" ,".vms":"application/x-dreamcast-vms" ,".vox":"audio/voxware" ,".vqe":"audio/x-twinvq-plugin" ,".vqf":"audio/x-twinvq" ,".vql":"audio/x-twinvq" ,".vre":"x-world/x-vream" ,".vrml":"x-world/x-vrml" ,".vrt":"x-world/x-vrt" ,".vrw":"x-world/x-vream" ,".vts":"workbook/formulaone" ,".wav":"audio/x-wav" ,".wax":"audio/x-ms-wax" ,".wbmp":"image/vnd.wap.wbmp" ,".wcm":"application/vnd.ms-works" ,".wdb":"application/vnd.ms-works" ,".web":"application/vnd.xara" ,".wi":"image/wavelet" ,".wis":"application/x-InstallShield" ,".wks":"application/vnd.ms-works" ,".wm":"video/x-ms-wm" ,".wma":"audio/x-ms-wma" ,".wmd":"application/x-ms-wmd" ,".wmf":"application/x-msmetafile" ,".wml":"text/vnd.wap.wml" ,".wmlc":"application/vnd.wap.wmlc" ,".wmls":"text/vnd.wap.wmlscript" ,".wmlsc":"application/vnd.wap.wmlscriptc" ,".wmlscript":"text/vnd.wap.wmlscript" ,".wmv":"audio/x-ms-wmv" ,".wmx":"video/x-ms-wmx" ,".wmz":"application/x-ms-wmz" ,".wpng":"image/x-up-wpng" ,".wps":"application/vnd.ms-works" ,".wpt":"x-lml/x-gps" ,".wri":"application/x-mswrite" ,".wrl":"x-world/x-vrml" ,".wrz":"x-world/x-vrml" ,".ws":"text/vnd.wap.wmlscript" ,".wsc":"application/vnd.wap.wmlscriptc" ,".wv":"video/wavelet" ,".wvx":"video/x-ms-wvx" ,".wxl":"application/x-wxl" ,".x-gzip":"application/x-gzip" ,".xaf":"x-world/x-vrml" ,".xar":"application/vnd.xara" ,".xbm":"image/x-xbitmap" ,".xdm":"application/x-xdma" ,".xdma":"application/x-xdma" ,".xdw":"application/vnd.fujixerox.docuworks" ,".xht":"application/xhtml+xml" ,".xhtm":"application/xhtml+xml" ,".xhtml":"application/xhtml+xml" ,".xla":"application/vnd.ms-excel" ,".xlc":"application/vnd.ms-excel" ,".xll":"application/x-excel" ,".xlm":"application/vnd.ms-excel" ,".xls":"application/vnd.ms-excel" ,".xlsx":"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" ,".xlt":"application/vnd.ms-excel" ,".xlw":"application/vnd.ms-excel" ,".xm":"audio/x-mod" ,".xml":"text/plain",".xml":"application/xml",".xmz":"audio/x-mod" ,".xof":"x-world/x-vrml" ,".xpi":"application/x-xpinstall" ,".xpm":"image/x-xpixmap" ,".xsit":"text/xml" ,".xsl":"text/xml" ,".xul":"text/xul" ,".xwd":"image/x-xwindowdump" ,".xyz":"chemical/x-pdb" ,".yz1":"application/x-yz1" ,".z":"application/x-compress" ,".zac":"application/x-zaurus-zac" ,".zip":"application/zip" ,".json":"application/json"
}

2. 下载web服务器上的文件

方式一：直接在浏览器输入对应的资源路径，回车

直接在浏览器输入对应的资源路径即可，比如http://127.0.0.1:3000/static.zip

方式二：在index.html文件中加入对应资源的a标签

在index.html文件中加入对应资源的<a></a>标签，比如

点击该链接：

下一章 nodejs项目实战教程09——封装静态Web服务器并进行路由管理

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