Node.js模擬浏覽器文件上傳示例

 這篇文章主要介紹了Node.js模擬浏覽器文件上傳的實現代碼,需要的朋友可以參考下

OSChina上發過了，那個也是我的，現在放到這來，哈哈     代碼如下: var path=require("path");  var fs=require("fs");  var http=require("http");    //post值payload  var getfield=function(field, value) {  return 'Content-Disposition: form-data; name="'+field+'"rnrn'+value+'rn';  }    //文件payload  var getfieldHead=function (field, filename) {  var fileFieldHead='Content-Disposition: form-data; name="'+field+'"; filename="'+filename+'"rn'+'Content-Type: '+getMime(filename)+'rnrn';  return fileFieldHead;  }  //獲取Mime  var getMime=function (filename) {  var mimes = {  '.png': 'image/png',  '.gif': 'image/gif',  '.jpg': 'image/jpeg',  '.jpeg': 'image/jpeg',  '.js': 'appliction/json',  '.torrent': 'application/octet-stream'  };  var ext = path.extname(filename);  var mime = mimes[ext];  mime=!!mime?mime:'application/octet-stream';  return mime;  }  //獲取邊界檢查隨機串  var getBoundary=function() {  var max = 9007199254740992;  var dec = Math.random() * max;  var hex = dec.toString(36);  var boundary = hex;  return boundary;  }  //獲取boundary  var getBoundaryBorder=function (boundary) {  return '--'+boundary+'rn';  }  //字段格式化  function fieldPayload(opts) {  var payload=[];  for(var id in opts.field){  payload.push(getfield(id,opts.field[id]));  }  payload.push("");  return payload.join(getBoundaryBorder(opts.boundary));  }    //post數據  function postRequest (opts) {  filereadstream(opts,function (buffer) {  var options=require('url').parse(opts.url);  var Header={};  var h=getBoundaryBorder(opts.boundary);  var e=fieldPayload(opts);  var a=getfieldHead(opts.param,opts.file);  var d="rn"+h;  Header["Content-Length"]=Buffer.byteLength(h+e+a+d)+buffer.length;  Header["Content-Type"]='multipart/form-data; boundary='+opts.boundary;  options.headers=Header;  options.method='POST';  var req=http.request(options,function(res){  var data='';  res.on('data', function (chunk) {  data+=chunk;  });  res.on('end', function () {  console.log(res.statusCode)  console.log(data);  });  });  req.write(h+e+a);log.diy(h+e+a+buffer+d);  req.write(buffer);  req.end(d);  });    }  //讀取文件  function filereadstream(opts, fn) {  var readstream = fs.createReadStream(opts.file,{flags:'r',encoding:null});  var chunks=[];  var length = 0;  readstream.on('data', function(chunk) {  length += chunk.length;  chunks.push(chunk);  });  readstream.on('end', function() {  var buffer = new Buffer(length);  for(var i = 0, pos = 0, size = chunks.length; i < size; i++) {  chunks[i].copy(buffer, pos);  pos += chunks[i].length;  }  fn(buffer);  });  }    //各類設置  var opt={  "url":"http://xxxx.xx",//url  "file":"00.jpg",//文件位置  "param":"file",//文件上傳字段名  "field":{//其余post字段  "client":"1",  "title":"ok"  },  "boundary":"----WebKitFormBoundary"+getBoundary()  }    postRequest(opt);  /*  ------WebKitFormBoundaryuzKmkAovUuYsQ1Dtrn    Content-Disposition: form-data; name="file"; filename="00.jpg"rn  Content-Type: application/octet-stream  rn  rn +filern    ------WebKitFormBoundaryuzKmkAovUuYsQ1Dtrn    Content-Disposition: form-data; name="fieldName"  rn  rn +valuern    ------WebKitFormBoundaryuzKmkAovUuYsQ1Dt--  */    最後這個注釋的是標准格式“rn”代表實際的字符串，為了看著舒服，視覺上也調整一下