从 AWS Lambda 函数解析 JSON 答案答案

【问题标题】：Parsing JSON answer from an AWS Lambda function从 AWS Lambda 函数解析 JSON 答案
【发布时间】：2019-06-08 11:53:45
【问题描述】：

我刚刚让 AWS Lambda 函数按预期工作，但我无法解析它的 JSON 答案。我为此使用 SwiftyJSON。

这是我的测试代码：

let json = JSON(task.result!)
print("SWyJSON: \(json)")

if let jsonDic = json.dictionary {
    print("SWyJSON2a: \(jsonDic)")
    print("SWyJSON2b: \(String(describing: jsonDic["body"]!))")
    if let x = json.dictionary?["body"]?.dictionary {
        print("SWyJSON2c: \(String(describing: x["Users"]))")
    }
}

SWyJSON: {
  "inBound" : "9bf69.....14d5ac4",
  "body" : "{\"Users\":[{\"Username\":\"test1\",\"Attributes\":[{\"Name\":\"email\",    \"Value\":\"y547170@nidtv.net\"}],\"UserCreateDate\":\"2019-06-03T02:53:03.300Z\",  \"UserLastModifiedDate\":\"2019-06-03T02:53:56.580Z\",\"Enabled\":true,\"UserStatus\":\"CONFIRMED\"}]}",
  "statusCode" : 200
}

SWyJSON2a: ["inBound": 9bf69.....14d5ac4, "body": {"Users":[{"Username":"test1","Attributes":[  {"Name":"email","Value":"y547170@nidtv.net"}],"UserCreateDate":"2019-06-03T02:53:03.300Z",    "UserLastModifiedDate":"2019-06-03T02:53:56.580Z","Enabled":true,"UserStatus":"CONFIRMED"}]}, "statusCode":     200]

SWyJSON2b: {"Users":[{"Username":"test1","Attributes":[{"Name":"email","Value":"y549860@nwytg.net"}],   "UserCreateDate":"2019-06-03T02:53:03.300Z","UserLastModifiedDate":"2019-06-03T02:53:56.580Z", "Enabled":true,"UserStatus":"CONFIRMED"}]}

我的问题是：代码有什么问题导致最后一次打印没有给出任何结果？

SWyJSON、SWyJSON2a 和 SWyJSON2b 在 Xcode 调试控制台中显示了一些结果，如我所料，但不是 SWyJSON2c。我期望的地方是：

"Users":[{"Username":"test1","Attributes":[{"Name":"email","Value":"y549860@nwytg.net"}],   "UserCreateDate":"2019-06-03T02:53:03.300Z","UserLastModifiedDate":"2019-06-03T02:53:56.580Z", "Enabled":true,"UserStatus":"CONFIRMED"}]

或：

[{"Username":"test1","Attributes":[{"Name":"email","Value":"y549860@nwytg.net"}],   "UserCreateDate":"2019-06-03T02:53:03.300Z","UserLastModifiedDate":"2019-06-03T02:53:56.580Z", "Enabled":true,"UserStatus":"CONFIRMED"}]

【问题讨论】：

标签： json swift amazon-web-services aws-lambda swifty-json

【解决方案1】：

body 值是字符串而不是字典，所以更改

if let x = json.dictionary?["body"]?.dictionary {

到

if let x = json.dictionary?["body"]?.string {

    let data = Data(x.utf8)

    let content = try? JSONSerialization.jsonObject(with:data, options: [])

    if let _  =  content as? [[String:Any]] { // array 

       let res = try?  JSONDecoder().decode([Root].self,from:data)

       print(res)

    }
    else if let dic  =  content as? [String:Any] {  {

       guard let users = dic["Users"] else { return } // dictionay

       guard let jsonData = try? JSONSerialization.data(withJSONObject: users, options:[]) else { return }

       let res = try?  JSONDecoder().decode([Root].self,from:jsonData)

       print(res)

    }
}


  // MARK: - Element
struct Root: Codable {
    let username: String
    let attributes: [Attribute]
    let userCreateDate, userLastModifiedDate: String
    let enabled: Bool
    let userStatus: String

    enum CodingKeys: String, CodingKey {
        case username = "Username"
        case attributes = "Attributes"
        case userCreateDate = "UserCreateDate"
        case userLastModifiedDate = "UserLastModifiedDate"
        case enabled = "Enabled"
        case userStatus = "UserStatus"
    }
}

// MARK: - Attribute
struct Attribute: Codable {
    let name, value: String

    enum CodingKeys: String, CodingKey {
        case name = "Name"
        case value = "Value"
    }
}

【讨论】：