postfile.js

var http = require('http');
var path = require('path');
var fs = require('fs');

function postFileRun(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: "images", urlValue: "00.jpg"}
];

var options = {
	host: "localhost", 
	port: "80" , 
	method: "POST", 
	path: "/uploader/s_upload.php"
}

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);
// })

postFileRun(files, req);

// console.log("done");