web前端|js教程
Node.js,模拟,浏览器,文件上传
web前端-js教程
OSChina上发过了，那个也是我的，现在放到这来，哈哈
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这段代码只能一次上传一个文件~~
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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+\"\r\n\r\n+value+\ \n;
}
//文件payload
var getfieldHead=function (field, filename) {
var fileFieldHead=Content-Disposition: form-data; name="+field+\"; filename="+filename+\"\r\n+Content-Type: +getMime(filename)+\ \n\r\n;
return fileFieldHead;
}
//获取Mime
var getMime=function (filename) {
var mimes = {
.jpg: image/png,
.jpg: 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+\ \n;
}
//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="\r\n"+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: ,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);
/*
------WebKitFormBoundaryuzKmkAovUuYsQ1Dt\r\n
Content-Disposition: form-data; name="file"; filename="00.jpg"\r\n
Content-Type: application/octet-stream
\r\n
\r\n +file\r\n
------WebKitFormBoundaryuzKmkAovUuYsQ1Dt\r\n
Content-Disposition: form-data; name="fieldName"
\r\n
\r\n +value\r\n
------WebKitFormBoundaryuzKmkAovUuYsQ1Dt--
*/
最后这个注释的是标准格式“\n”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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