swift中系统的请求方法

//// 使用系统默认的方式创建URLSession 基本流程如下

    let kServerBaseUrl = "http://127.0.0.1/iosxHelper/SAPI"

    func urlSessionNoDelegateTest() {

        //创建一个默认的Session配置

        let defaultConfigObject = URLSessionConfiguration.default

        //创建URLSession，对于系统的默认的代理进行收到数据处理的情况，设置delegate参数

        //为nil，同时设置代理执行的队列为主线程队列，在此也可以创建自己的私有队列

        let session = URLSession(configuration: defaultConfigObject, delegate: nil, delegateQueue: OperationQueue.main)

        let url = URL(string: kServerBaseUrl + "/VersionCheck")!

        //构造URLRequest对象， （接口的url路径，缓存规则协议约定的策略,超时时间）

        var request = URLRequest(url: url, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 30)

        request.httpMethod = "POST"

        request.setValue("application/x-www-form-urlencode", forHTTPHeaderField: "content-type")

        let post = "versionNo=1.0&platform=Mac&channel=appstore*appName=DBAppx"

        let postData = post.data(using: String.Encoding.utf8)

        request.httpBody = postData

        let dataTask = session.dataTask(with: request) { (data, response, error) -> Void in

            let responseStr = String(data: data!, encoding: String.Encoding.utf8)

            print("data = (String(describing: responseStr))")

        }

        dataTask.resume()

    }

//使用自定义代理方法创建URLSession

    func urlSessionDelegateTest() {

        //使用默认配置

        let defaultConfigObject = URLSessionConfiguration.default

        //创建session并设置代理

        let session = URLSession(configuration: defaultConfigObject, delegate: self, delegateQueue: OperationQueue.main)

        let url = URL(string: kServerBaseUrl + "/Version")!

        var request = URLRequest(url: url, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 30)

        request.httpMethod = "POST"

        request.setValue("application/x-www-form-urlencode", forHTTPHeaderField: "content-type")

        let post = "versionNo=1.0&platform=Mac&channel=appstore*appName=DBAppx"

        let postData = post.data(using: String.Encoding.utf8)

        let uploadTask = session.uploadTask(with: request, from: postData) { (data, response, error) -> Void in

            let responseStr = String(data: data!, encoding: String.Encoding.utf8)

            print("uploadTask data = (responseStr)")

        }

        uploadTask.resume()

    }

    //文件下载

    func urlSessionDownLoadFileTest() {

        let defaultConfigObject = URLSessionConfiguration.default

        //创建session制定代理和任务队列

        let session = URLSession(configuration: defaultConfigObject, delegate: self, delegateQueue: OperationQueue.main)

        //制定下载文件的URL

        let url = URL(string: "http://...png")

        //创建Download任务

        let task = session.downloadTask(with: url!)

        task.resume()

    }

    //文件上传 流式文件上传客户端代码

    func urlSeseionUploadFileTst() {

        let uploadURL = URL(string: "http://127.0.0.1/fileUpload.php")!

        var request = URLRequest(url: uploadURL)

        request.httpMethod = "POST"

        //要上传的路径，假设document目录下有个AppBkIcon.png文件

        let uploadFileURL = URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Documents").appendingPathComponent("ppBkIcon.png")

        request.setValue("applicaiton/octet-stream", forHTTPHeaderField: "Content-type")

        let defaultConfigObject = URLSessionConfiguration.default

        let session = URLSession(configuration: defaultConfigObject, delegate: self, delegateQueue: OperationQueue.main)

        let uploadTask = session.uploadTask(with: request, fromFile: uploadFileURL) { (data, reponse, error) -> Void in

            if error != nil {

                print("error (String(describing: error))")

            }

        }

        uploadTask.resume()

    }

    //表单文件上传

    func urlSessionUploadFormFileTest() {

        //服务器地址

        let urlString = "http:127.0.0.1/formUpload.php"

        let url = URL(string: urlString)

        //上传文件的路径

    let fileURL = URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Documents").appendingPathComponent("AppBkIcon.png")

        let fileName = fileURL.lastPathComponent

        let fileData = try? Data(contentsOf: fileURL)

        let boundary = "-bounday"

        //上传的数据缓存

        var dataSend = Data()

        //bounary参数填充开始

        dataSend.append("--(boundary) ".data(using: String.Encoding.utf8)!)

        //form表单的参数

        dataSend.append("Content-Disposition: form-data; name="file";filename="(fileName)" ".data(using: String.Encoding.utf8)!)

        dataSend.append("Content-Type: applicaiton/octet-stream ".data(using: String.Encoding.utf8)!)

        dataSend.append(fileData!)

        dataSend.append(" ".data(using: String.Encoding.utf8)!)

        //boundary参数填充结束

        dataSend.append("--(boundary)-- ".data(using: String.Encoding.utf8)!)

        //请求参数

        var request = URLRequest(url: url!)

        request.httpMethod = "POST"

        request.httpBody = dataSend

        request.setValue("multipart/form-data; boundary=(boundary)", forHTTPHeaderField: "Content-Type")

        

        let sessionConfiguration = URLSessionConfiguration.default

        let session = URLSession(configuration: sessionConfiguration, delegate: self, delegateQueue: nil)

        

        //发起上传任务

        let sessionUploadTask = session.uploadTask(with: request, from: dataSend)

        sessionUploadTask.resume()

    }

    

    //服务器端php上传处理代码，脚本文件formUpload.php

//    <?php

//    if ($_FILES["file"]["error"] > 0)

//    {

//    echo "Return Code: ".$_FILES["file"]["error"]."<br />";

//    }

//    else

//    {

//        echo "Upload: ".$_FILE["file"]["name"]."<br />"

//        echo "Type: ".$_FILE["file"]["type"]."<br />"

//        echo "Size: ".$_FILE["file"]["size"] / 1024."kb<br />"

//        echo "Temp file: ".$_FILE["file"]["tmp_name"]."<br />"

//        if (file_exists("upload/". $_FILES["file"]["name"]))

//        {

//            echo $_FILES["file"]["name"]. "already exists.";

//        }

//        else

//        {

//            move_upload_file($_FILES["file"]["name"], "upload/". $_FILES["file"]["name"]);

//            echo "Stroed in: ". "upload/". _FILES["file"]["name"];

//        }

//    }

//    ?>

    //新建一个formUpload.html文件

//    <html>

//        <body>

//            <form aciton="fileUpload.php" method="psot" enctype"multipart/form-data">

//            <label for="file">FileName:</label>

//            <input type="file" name="file" id="file" />

//            <br />

//            <input type="submit" name="submit" value="Submit" />

//        </body>

//    </html>

    //将上述formUpload.php和fromUpload.html都复制到XAMPP的htdocs跟目录，完成服务端发布然后客户端测试

    

    

    //缓存策略

    /****

     *1.userProtocolCachePolicy：协议规定的缓存策略 模式使用这种策略

     *2.reloadIgnoringLocalCacheData: 不适用缓存，永远适用网路数据

     *3.returnCacheDataElseLoad: 适用缓存数据，不管数据是否过期，如果缓存没有数据才请求网络数据

     *4.returnCacheDataDontLoad: 仅仅适用缓存数据

     **/

    

}

//urlSessionDelegateTest

extension ViewController:URLSessionDelegate {

    

}

//实现下载协议 urlSessionDownLoadFileTest

extension ViewController: URLSessionDownloadDelegate {

    //下载完成

    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {

        let fileName = downloadTask.originalRequest?.url?.lastPathComponent

        let fileManager = FileManager.default

        //要保存的路径

        let downloadURL = URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Download").appendingPathComponent(fileName!)

        //从下载的临时路径移动到期望的路径

        do {

            try fileManager.moveItem(at: location, to: downloadURL)

        } catch let error {

            print("error (error)")

        }

    }

    //接受到数据以后的回调

    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {

        print("receive byte (bytesWritten) of totalBytes (totalBytesExpectedToWrite)")

    }

//MARK:- 文件上传 流式文件上传客户端代码

//func urlSeseionUploadFileTst

extension ViewController:URLSessionTaskDelegate {

    func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {

        print("Send btyes (bytesSent) of totalBytes (totalBytesExpectedToSend)")

    }

    //服务器创建fileUpload.php脚本，复制到XAMPP的htdocs跟目录下

//    <?php

//     //上传后保存的文件路径和名称

//    $file = 'upload/recording.png'

//    //获取上传的内容

//    $request_body = @file_get_contents('php://input')

//    //解析文件mime类型

//    $mime_type = $file_info->buffer($request_body);

//    //根据mime类型处理

//    switch($mime_type)

//    {

//    case "image/png; charset=binary":

//        //写文件到制定路径

//    file_put_contents($file,$request_body);

//    break;

//    default;

//    }

    

    //MARK: -    缓存控制编程

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, willCacheResponse proposedResponse: CachedURLResponse, completionHandler: @escaping (CachedURLResponse) -> Swift.Void) {

        var returnCacheResponse = proposedResponse

        var newUserInfo = [String: Any]()

        newUserInfo = ["Chched Date": Date()]

        #if ALLOW_CACHING

        returnCacheResponse = CachedURLResponse(response: proposedResponse.response, data: proposedResponse.data, userInfo: newUserInfo, storagePolicy: proposedResponse.storagePolicy)

        completionHandler(returnCacheResponse)

        #else

        completionHandler(returnCacheResponse)

        #endif

        

    }

}