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/');

在这里插入图片描述

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）。
在这里插入图片描述
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：
在这里插入图片描述
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：
在这里插入图片描述
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" ,
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  ".wis":"application/x-InstallShield" ,
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  ".wm":"video/x-ms-wm" ,
  ".wma":"audio/x-ms-wma" ,
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  ".wmlscript":"text/vnd.wap.wmlscript" ,
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  ".wps":"application/vnd.ms-works" ,
  ".wpt":"x-lml/x-gps" ,
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  ".xdma":"application/x-xdma" ,
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}