快速，将文件发送到服务器

本文介绍了快速，将文件发送到服务器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在学习迅速，并使用以下代码向服务器发送请求.它适用于简单的请求，并且我从服务器获得响应.我的问题是我无法将文件发送到服务器.

I am learning swift and I send a request to the server with the code below. It works for simple request and I get response from the server. My problem is I can not send a file to server.

代码:

let parameters = parameter let request = NSMutableURLRequest(URL: NSURL(string: requestUrl)!) let boundaryConstant = "-----Boundary+\(arc4random())\(arc4random())" let contentType = "multipart/form-data; boundary=" + boundaryConstant let boundaryStart = "--\(boundaryConstant)\r\n" let boundaryEnd = "--\(boundaryConstant)--\r\n" let body:NSMutableString = NSMutableString(); for (key, value) in parameters { body.appendFormat(boundaryStart) body.appendFormat("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n") body.appendFormat("\(value)\r\n") } body.appendFormat(boundaryEnd) request.HTTPMethod = "POST" request.setValue(contentType, forHTTPHeaderField: "Content-Type") request.HTTPBody = body.dataUsingEncoding(NSUTF8StringEncoding) let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in guard error == nil && data != nil else { // check for fundamental networking error print("error=\(error)") return } if let httpStatus = response as? NSHTTPURLResponse where httpStatus.statusCode != 200 { // check for http errors print("statusCode should be 200, but is \(httpStatus.statusCode)") print("response = \(response)") } self.responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)! print("MMMMMMMM \(self.responseString)") self.result = self.responseString.dataUsingEncoding(NSUTF8StringEncoding)! as NSData callback(self.responseString) } print("code start") task.resume()

结果: 我可以通过以下代码将文件发布到服务器:

result : i can post file to server by this code:

override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. let request = createRequest() let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in if error != nil { // handle error here print(error) return } do { if let responseDictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary { print("success == \(responseDictionary)") } } catch { print(error) let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding) print("responseString = \(responseString)") } } task.resume() } func createRequest () -> NSURLRequest { let param = [] let boundary = generateBoundaryString() let url = NSURL(string: "URl")! let request = NSMutableURLRequest(URL: url) request.HTTPMethod = "POST" request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type") request.setValue("userValue", forHTTPHeaderField: "X-Client-user") request.setValue("passValue", forHTTPHeaderField: "X-Access-pass") //let path1 = NSBundle.mainBundle().pathForResource("voice", ofType: "png") as String! request.HTTPBody = createBodyWithParameters(param, filePathKey: "voice", paths: ["pathURl"], boundary: boundary) return request } func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, paths: [String]?, boundary: String) -> NSData { let body = NSMutableData() if parameters != nil { for (key, value) in parameters! { body.appendString("--\(boundary)\r\n") body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n") body.appendString("\(value)\r\n") } } if paths != nil { for path in paths! { let url = NSURL(fileURLWithPath: path) let filename = url.lastPathComponent let data = NSData(contentsOfURL: url)! let mimetype = mimeTypeForPath(path) body.appendString("--\(boundary)\r\n") body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename!)\"\r\n") body.appendString("Content-Type: \(mimetype)\r\n\r\n") body.appendData(data) body.appendString("\r\n") } } body.appendString("--\(boundary)--\r\n") return body } func generateBoundaryString() -> String { return "Boundary-\(NSUUID().UUIDString)" } func mimeTypeForPath(path: String) -> String { let url = NSURL(fileURLWithPath: path) let pathExtension = url.pathExtension if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension! as NSString, nil)?.takeRetainedValue() { if let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() { return mimetype as String } } return "application/octet-stream"; }

推荐答案

在这里阅读时，应该使用NSURLSession进行HTTP工作，它更加灵活和强大.而且我认为注定要替换NSURLconnection ...

As you read here, you should use NSURLSession for HTTP work, it far more flexible and powerful; and I think is destined to replace NSURLconnection...

www.objc.io/issues/5-ios7/from-nsurlconnection-to-nsurlsession/

以下是您的示例...

Here is a example for you...

func getMetaData(lePath:String, completion: (string: String?, error: ErrorType?) -> Void) { // **** get_metadata **** let request = NSMutableURLRequest(URL: NSURL(string: "api.dropboxapi/2/files/get_metadata")!) let session = NSURLSession.sharedSession() request.HTTPMethod = "POST" request.addValue("Bearer ab-blah-blah", forHTTPHeaderField: "Authorization") request.addValue("application/json",forHTTPHeaderField: "Content-Type") request.addValue("path", forHTTPHeaderField: lePath) let cursor:NSDictionary? = ["path":lePath] do { let jsonData = try NSJSONSerialization.dataWithJSONObject(cursor!, options: []) request.HTTPBody = jsonData print("json ",jsonData) } catch { print("snafoo alert") } let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in if let error = error { completion(string: nil, error: error) return } let strData = NSString(data: data!, encoding: NSUTF8StringEncoding) print("Body: \(strData)\n\n") do { let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options:NSJSONReadingOptions.MutableContainers); self.jsonParser(jsonResult,field2file: "ignore") for (key, value) in self.parsedJson { print("key2 \(key) value2 \(value)") } completion(string: "", error: nil) } catch { completion(string: nil, error: error) } }) task.resume() }