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Node.js模拟浏览器文件上传示例
来源:互联网   发布日期:2016-01-26 10:25:29   浏览:2651次  

导读:这篇文章主要介绍了Node js模拟浏览器文件上传的实现代码,需要的朋友可以参考下OSChina上发过了,那个也是我的,现在放到这来,哈哈代码如下:var path=require(path);var fs=require(fs);var http=requir ...

这篇文章主要介绍了Node.js模拟浏览器文件上传的实现代码,需要的朋友可以参考下

OSChina上发过了,那个也是我的,现在放到这来,哈哈

代码如下:

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;

}

//获取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;

}

//获取边界检查随机串

var getBoundary=function() {

var max = 9007199254740992;

var dec = Math.random() * max;

var hex = dec.toString(36);

var boundary = hex;

return boundary;

}

//获取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数据

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);

});

}

//读取文件

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);

});

}

//各类设置

var opt={

"url":"http://xxxx.xx",//url

"file":"00.jpg",//文件位置

"param":"file",//文件上传字段名

"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--

*/

最后这个注释的是标准格式 rn 代表实际的字符串,为了看着舒服,视觉上也调整一下

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