[Swift]JSON字符串与字典(Dictionary)、数组(Array)之间的相互转换

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1、JSON字符串与字典(Dictionary)之间的相互转换

import Foundation
//JSON字符串转换为字典(Dictionary)
func getDictionaryFromJSONString(_ jsonString:String) ->NSDictionary{
    let jsonData:Data = jsonString.data(using: .utf8)!
    let dict = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)
    if dict != nil {
        return dict as! NSDictionary
    }
    return NSDictionary()
}

//字典(Dictionary)转换为JSON字符串
func getJSONStringFromDictionary(_ dictionary:NSDictionary) -> String {
    if (!JSONSerialization.isValidJSONObject(dictionary)) {
        print("无法解析出JSON字符串")
        return String()
    }
    let data : NSData! = try? JSONSerialization.data(withJSONObject: dictionary, options: []) as NSData?
    let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue)
    return JSONString! as String
}

测试：

//JSON字符串
let str:String = "{"server":"192.168.0.1","port":"88","username":"administrator","password":"123456"}"
print(str)
//Print {"server":"192.168.0.1","port":"88","username":"administrator","password":"123456"}

//JSON字符串转换为字典(Dictionary)
let strDic = getDictionaryFromJSONString(str)
print(strDic)
//Print
/*
{
    server = "192.168.0.1";
    port = 88;
    username = administrator;
    password = "123456";
}
*/

//字典(Dictionary)转换为JSON字符串
let strJson = getJSONStringFromDictionary(strDic)
print(strJson)
//Print {"server":"192.168.0.1","port":"88","username":"administrator","password":"123456"}

2、JSON字符串与数组(Array)之间的相互转换

import Foundation
//JSON字符串转换为数组(Array)
func getArrayFromJSONString(_ jsonString:String) ->NSArray{        
    let jsonData:Data = jsonString.data(using: .utf8)!         
    let array = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)
    if array != nil {
        return array as! NSArray
    }
    return array as! NSArray
}

//数组(Array)转换为JSON字符串
func getJSONStringFromArray(_ array:NSArray) -> String {
    if (!JSONSerialization.isValidJSONObject(array)) {
        print("无法解析出JSON字符串")
        return String()
    }
    let data : NSData! = try? JSONSerialization.data(withJSONObject: array, options: []) as NSData!
    let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue)
    return JSONString! as String     
}

测试:

//JSON字符串

let str:String = "{"employees":[{"firstName":"John","lastName":"Doe" },{ "firstName":"Anna","lastName":"Smith"}]}"
print(str)
//Print {"employees":[{"firstName":"John","lastName":"Doe" },{ "firstName":"Anna","lastName":"Smith"}]}

//JSON字符串转换为数组(Array)
let strArr = getArrayFromJSONString(str)
print(strArr)
//Print Could not cast value of type 'Foundation.NSDictionary' (0x7f7b01c80bb8) to 'Foundation.NSArray' (0x7f7b01c7ad60).

//数组(Array)转换为JSON字符串
let strJson = getJSONStringFromArray(strArr)
print(strJson)
//Print