swift4--使用URLSession进行网络请求

这里写了怎么拿到json数据

不知道怎么解析的小伙伴可以看我另一篇贴子 《 swift4--解析json》

GET请求：

//
//  ViewController.swift
//  URLSesstionTest
//


import UIKit

class ViewController: UIViewController {
    //    要传递的参数
    var keyWord:String?
    //    qq音乐搜索接口
    var urlString:String = "http://s.music.qq.com/fcgi-bin/music_search_new_platform?t=0&%20n=3&aggr=1&cr=1&loginUin=0&format=json&%20inCharset=GB2312&outCharset=utf-8&notice=0&%20platform=jqminiframe.json&needNewCode=0&p=1&catZhida=0&%20remoteplace=sizer.newclient.next_song&w="
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        keyWord = "许嵩"
        if keyWord == nil {
            print("啥都没输呢")
        }
        else {
            urlString = urlString + keyWord!
        }
//        加密，当传递的参数中含有中文时必须加密
        let newUrlString = urlString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
        //创建请求配置
        let config = URLSessionConfiguration.default
//        创建请求URL
        let url = URL(string: newUrlString!)
//        创建请求实例
        let request = URLRequest(url: url!)
        
//        进行请求头的设置
//        request.setValue(Any?, forKey: String)
        
//        创建请求Session
        let session = URLSession(configuration: config)
//        创建请求任务
        let task = session.dataTask(with: request) { (data,response,error) in
//            print(String(data: data! , encoding: .utf8) as Any)
//            将json数据解析成字典
            let dictionary = try? JSONSerialization.jsonObject(with: data!, options: .mutableContainers)
            print(dictionary!)
            
        }
//        激活请求任务
        task.resume()
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

POST请求：

  
    func post(name:String,password:String) {

        let session = URLSession(configuration: .default)
        // 设置URL(该地址不可用，写你自己的服务器地址)
        let url = "http://66.666.666.666/"
        var request = URLRequest(url: URL(string: url)!)
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        request.httpMethod = "POST"
        // 设置要post的内容，字典格式
        let postData = ["name":"\(name)","password":"\(password)"]
        let postString = postData.compactMap({ (key, value) -> String in
            return "\(key)=\(value)"
        }).joined(separator: "&")
        request.httpBody = postString.data(using: .utf8)
        // 后面不解释了，和GET的注释一样
        let task = session.dataTask(with: request) {(data, response, error) in
            do{
                //              将二进制数据转换为字典对象
                if let jsonObj:NSDictionary = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions()) as? NSDictionary
                {
                    print(jsonObj)
                    //主线程
                    DispatchQueue.main.async{
                        
                    }
                }
            } catch{
                print("Error.")
                DispatchQueue.main.async{
                    
                }
                
            }
        }
        task.resume()
    }