nodejs 实现模拟form表单上传文件

以前项目里有这个方法,最近在客户那里出问题了,同事说,这个方法从来就没管用过,SO,用了一天时间把这个方法给搞出来了(觉得花费的时间长了点),分享之。

代码及测试用例:

var http = require('http');

var path = require('path');

var fs = require('fs');

function postFile(fileKeyValue, req) {

var boundaryKey = Math.random().toString(16);

var enddata = '\r\n----' + boundaryKey + '--';

var files = new Array();

for (var i = 0; i < fileKeyValue.length; i++) {

var content = "\r\n----" + boundaryKey + "\r\n" + "Content-Type: application/octet-stream\r\n" + "Content-Disposition: form-data; name=\"" + fileKeyValue[i].urlKey + "\"; filename=\"" + path.basename(fileKeyValue[i].urlValue) + "\"\r\n" + "Content-Transfer-Encoding: binary\r\n\r\n";

var contentBinary = new Buffer(content, 'utf-8');//当编码为ascii时,中文会乱码。

files.push({contentBinary: contentBinary, filePath: fileKeyValue[i].urlValue});

}

var contentLength = 0;

for (var i = 0; i < files.length; i++) {

var stat = fs.statSync(files[i].filePath);

contentLength += files[i].contentBinary.length;

contentLength += stat.size;

}

req.setHeader('Content-Type', 'multipart/form-data; boundary=--' + boundaryKey);

req.setHeader('Content-Length', contentLength + Buffer.byteLength(enddata));

// 将参数发出

var fileindex = 0;

var doOneFile = function(){

req.write(files[fileindex].contentBinary);

var fileStream = fs.createReadStream(files[fileindex].filePath, {bufferSize : 4 * 1024});

fileStream.pipe(req, {end: false});

fileStream.on('end', function() {

fileindex++;

if(fileindex == files.length){

req.end(enddata);

} else {

doOneFile();

}

});

};

if(fileindex == files.length){

req.end(enddata);

} else {

doOneFile();

}

}

//测试用例

//http://nodejs.org/api/http.html#http_http_request_options_callback

var files = [

{urlKey: "file1", urlValue: "E:\\DFBF.jpg"},

{urlKey: "file2", urlValue: "E:\\1.jpg"},

{urlKey: "file3", urlValue: "E:\\Pro 空格 中文.mp3"}

]

var options = {

host: "localhost",

port: "8908" ,

method: "POST",

path: "/Home/Upload"

}

var req = http.request(options, function(res){

console.log("RES:" + res);

console.log('STATUS: ' + res.statusCode);

console.log('HEADERS: ' + JSON.stringify(res.headers));

//res.setEncoding("utf8");

res.on("data", function(chunk){

console.log("BODY:" + chunk);

})

})

req.on('error', function(e){

console.log('problem with request:' + e.message);

console.log(e);

})

postFile(files, req);

console.log("done");

服务端测试,用mvc在home控制器写了个upload方法,并遍历上传的文件将其保存在硬盘上了。

只是上传大文件会有问题,估计是需要服务器进行配置,暂且不管。

服务端方法(写在了Home控制器下)

[HttpPost]

public string Upload()

{

//HttpPostedFileBase file = this.Request.Files["file"];

//file.SaveAs(file.FileName);

foreach (string file in this.Request.Files)

{

this.Request.Files[file].SaveAs(@"E:\新建文件夹\" + this.Request.Files[file].FileName);

}

return @"保存成功 路径:E:\新建文件夹\";

}

运行脚本:

node nodejsPostFile.js

运行结果:

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