ios - Swift-4：如何使用带有“Content-Type”的 URLSession 中的参数的 POST 请求获取数据：“application/x-www-form-urlencoded”

问题描述

朋友们，我已经经历了很多例子，这些例子都可以在 SO 虽然我没有收到正确的答案，但我仍然面临使用 URLSession 和 Post 请求并传递参数通过 api 请求获取数据的问题。

首先，我想告诉你，我有什么。一直试到现在...

func requestApiCall(){

    let renewal_id = ""
    let policy_no = ""
    let client_name = ""
    let client_id = ""
    let product_name = ""
    let created_date_from = ""
    let created_date_to = ""
    let policy_expiry_from = ""
    let policy_expiry_to = ""

    self.parameters = ["renewal_id":renewal_id,"policy_no":policy_no,"client_name":client_name,"client_id":client_id,"product_name":product_name,"created_date_from":created_date_from,"created_date_to":created_date_to,"policy_expiry_from":policy_expiry_from,"policy_expiry_to":policy_expiry_to]

    let config = URLSessionConfiguration.default
    config.httpAdditionalHeaders = [
        "Accept" : "application/json",
        "Content-Type" : "application/x-www-form-urlencoded"
    ]
    let session = URLSession(configuration: config)
    let Url = String(format: "http://myapi-url");
    let serviceUrl = URL(string: Url)
    var request = URLRequest(url: serviceUrl!)
    print(request.url!)
    request.httpMethod = "POST"
    request.timeoutInterval = 60

    request.httpBody  = try! JSONSerialization.data(withJSONObject: parameters!, options: [])

    let task = session.dataTask(with: request as URLRequest, completionHandler: {data, response, error -> Void in

        if error == nil{
            print(response!)
        }
        else {
            print(error?.localizedDescription as Any)
        }

        print(response!)
        guard let httpResponse = response as? HTTPURLResponse, let receivedData = data
            else {
                print("error: not a valid http response")
                return
        }

        switch (httpResponse.statusCode)
        {
        case 200: //The request was fulfilled
            let response = NSString (data: receivedData, encoding: String.Encoding.utf8.rawValue)

            if response == "SUCCESS"
            {
                print("Network - HandShaking Successfull...!!!")
            }
            else{
                print("Network - HandShaking is not successfull...!!!")
            }

        case 400:
            print("response-status - 400 : The request had bad syntax or was inherently impossible to be satisfied.")
        case 500:
            print("\nresponse-status - 500 : Internal Server Error...!!!")
        default:
            print("response-status - Unknown : Received Response =>  \(httpResponse.statusCode)")
        }
    })
    task.resume()
}

运行上述函数后，我得到 httpResponse.statusCode = 500

但是当我在邮递员中运行它时，我得到了正确的响应，就像方面一样。

Postman API 请求

我也尝试通过邮递员生成代码片段......如下......

func postmanSnippetApiCall(){
    let headers = [
        "Content-Type": "application/x-www-form-urlencoded",
        "cache-control": "no-cache",
        "Postman-Token": "5d571157-86c5-4eac-ba6d-b00779ae5dbd"
    ]

    let postData = NSMutableData(data: "renewal_id=".data(using: String.Encoding.utf8)!)
    postData.append("&policy_no=".data(using: String.Encoding.utf8)!)
    postData.append("&client_name=".data(using: String.Encoding.utf8)!)
    postData.append("&client_id=".data(using: String.Encoding.utf8)!)
    postData.append("&product_name=".data(using: String.Encoding.utf8)!)
    postData.append("&created_date_from=".data(using: String.Encoding.utf8)!)
    postData.append("&created_date_to=".data(using: String.Encoding.utf8)!)
    postData.append("&policy_expiry_from=".data(using: String.Encoding.utf8)!)
    postData.append("&policy_expiry_to=".data(using: String.Encoding.utf8)!)
    postData.append("&undefined=undefined".data(using: String.Encoding.utf8)!)

    let request = NSMutableURLRequest(url: NSURL(string: "http://myapiurl")! as URL,
                                      cachePolicy: .useProtocolCachePolicy,
                                      timeoutInterval: 10.0)
    request.httpMethod = "POST"
    request.allHTTPHeaderFields = headers
    request.httpBody = postData as Data

    let session = URLSession.shared
    let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
        if (error != nil) {
            print(error)
        } else {
            let httpResponse = response as? HTTPURLResponse
            print(httpResponse)
        }
    })

    dataTask.resume()
}

但是在邮递员生成的代码片段中，我在这一行收到错误，即request.httpBody = postData as Data错误是这个：Cannot convert value of type 'NSMutableData' to type 'Data' in coercion

如果我使用第三方库，即Alamofire，那么我可以很容易地获取数据。

Alamofire 代码片段...完美运行..& 给出了正确的响应。

func apiRequestByAlamofire(){
        let urlString = "http://myapiurl"

        let params: [String: Any]? = ["renewal_id":"","policy_no":"","client_name":"","client_id":"","product_name":"","created_date_from":"","created_date_to":"","policy_expiry_from":"","policy_expiry_to":""]

        Alamofire.request(urlString, method: .post, parameters: params).responseJSON { response in
            print(response) //Here getting perfect response successfully...!!!
        }

    }

但我仍然在通过 URLSession 苦苦挣扎......！！！

我仍然怀疑，为什么我在使用 URLSession 时遇到了太多问题。

以上我的疑问的朋友，请我对您的建议持开放态度，并请帮助我理解它。

不知道，我哪里错了。请帮帮我。

标签： iosswiftswift4nsurlsessionswift4.2

ios - Swift-4：如何使用带有“Content-Type”的 URLSession 中的参数的 POST 请求获取数据：“application/x-www-form-urlencoded”

问题描述

解决方案

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