Alamofire POST发送 x-www-form-urle

前言

近期在一个项目中调用服务器接口需要以post方式发送x-www-form-urlencoded类型数据，发现使用Alamofire死活没有把参数传给后台的问题。期间各种百度，谷歌，查Alamofire源码，最后还是在看到AFNetworking同样问题其他同学的解决方案才摸索到的解决方案。这里确实倒腾了不少时间才解决，遂、记录一下。

AFNetworking相同问题参考：

https://www.jianshu.com/p/bf4ddd9b3663
https://blog.csdn.net/sevenquan/article/details/50537314

常规请求

func testAlamofire(_ account:String, _ pwd:String){
        let urlString = "http://"
        let url =  NSURL(string:urlString)
        var request : URLRequest = URLRequest(url: url! as URL)
        request.httpMethod = "POST"
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        let params = "{\"data\":{\"cmd\":\"Login\",\"mid\":\"H0001\",\"Data\":{\"Logid\":\"\(account)\",\"Logpass\":\"\(pwd)\",\"TypeNo\":\"O\",\"machine\":\"\(kUIID ?? "unknow")\"} }}"
        let data = params.data(using: String.Encoding.utf8)
        request.httpBody = data
        
        Alamofire.request(request).responseJSON { (response) in
            switch response.result.isSuccess {
            case true:
                let jsonData = response.data!
                let jsonString = String.init(data: jsonData, encoding: .utf8)
                print("response：" + jsonString!)
                break
            case false:
                let jsonData = response.data!
                let jsonString = String.init(data: jsonData, encoding: .utf8)
                print("response err：" + jsonString!)
                break
            }
        }
    }

当我构建完请求认为没啥问题后一测，只见控制台

response err：缺少参数: data。

Postman测试

Postman请求

如图Postman请求正常，于是各种测试传参，网上有说是编码格式，基本都试了一遍也没有效果。最后发现还是传参格式问题。具体后台接收x-www-form-urlencoded类型参数怎样的原理也没去深究，了解这方面知识的同学还望不吝赐教。

正确姿势

func testAlamofire2(_ account:String, _ pwd:String){
        let urlString = "http://"
        let url =  NSURL(string:urlString)
        var request : URLRequest = URLRequest(url: url! as URL)
        request.httpMethod = "POST"
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        let params = "data={\"cmd\":\"Login\",\"mid\":\"H0001\",\"Data\":{\"Logid\":\"\(account)\",\"Logpass\":\"\(pwd)\",\"TypeNo\":\"O\",\"machine\":\"\(kUIID ?? "unknow")\"} }"
        let data = params.data(using: String.Encoding.utf8)
        request.httpBody = data
        
        Alamofire.request(request).responseJSON { (response) in
            switch response.result.isSuccess {
            case true:
                let jsonData = response.data!
                let jsonString = String.init(data: jsonData, encoding: .utf8)
                print("response：" + jsonString!)
                break
            case false:
                let jsonData = response.data!
                let jsonString = String.init(data: jsonData, encoding: .utf8)
                print("response err：" + jsonString!)
                break
            }
        }
    }

response：{"success":true,"msg":"登录成功","data":[{"s_work_no":"F001","vc_name":"房姐001","s_gade":"","TypeNo":"C","sex":"女"}]}