nodejs implements simulated form upload file_node.js

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：