Alamofire是一个使用Swift语言写的一个网络库，操作很简单，结合ObjectMapper、AlamofireObjectMapper，可以轻松的将JSON数据转换为对象类型！
Alamofire：https://github.com/Alamofire/Alamofire
ObjectMapper：https://github.com/Hearst-DD/ObjectMapper
ALamoObjectmapper：https://github.com/tristanhimmelman/AlamofireObjectMapper
假设有个地址返回如下JSON数据：
"meta": {
"total": "16868",
"time": "0.435",
"limit": "10",
"offset": 0,
"currency": "CNY",
"symbol": "¥"
"products": [
"time_updated": "1432808931",
"commission": "363.42",
"price": "6,056.92",
"sku": "517569",
"upc": "",
"pweight": null,
"product_id": "82808bcd27eeb65dd15740aee40ec07c",
"product_image": "http://images.rewardstyle.com/img?v=1.3&p=82808bcd27eeb65dd15740aee40ec07c",
"product_type": "1",
"product_name": "Cape-back crepe and chiffon mini dress",
"advertiser": "NET-A-PORTER UK",
"designer": "Gareth Pugh",
"category": "WOMEN->Clothing->Dresses"
"time_updated": "1432808931",
"commission": "1,359.23",
"price": "22,653.85",
"sku": "549499",
"upc": "",
"pweight": null,
"product_id": "e147fbbf30c65538b367f3a6ab539252",
"product_image": "http://images.rewardstyle.com/img?v=1.3&p=e147fbbf30c65538b367f3a6ab539252",
"product_type": "1",
"product_name": "Woven suede tote",
"advertiser": "NET-A-PORTER UK",
"designer": "Loewe",
"category": "WOMEN->Bags->Tote"
使用对象的概念来解读这段JSON数据，它包含Meta和Product：Meta是一个对象，Products是一个数组类型，包含了多个Product对象。
我们首先使用ObjectMapper库定义的规则，来写一个实体类。
class Meta : Mappable{
var total:String?
var time:Double?
var limit:String?
var offset:String?
var currency:String?
var symbol:String?
init(){}
required init?(_ map: Map){
mapping(map)
func mapping(map: Map) {
total <- map["total"]
time <- map["time"]
limit <- map["limit"]
offset <- map["offset"]
currency <- map["currency"]
symbol <- map["symbol"]
class Product : Mappable{
var time_updated:String?
var commission:String?
var price:String?
var sku:String?
var product_id:String?
var product_image:String?
var product_name:String?
var advertiser:String?
var designer:String?
var category:String?
init(){}
required init?(_ map: Map) {
mapping(map)
func mapping(map: Map) {
time_updated <- map["prtime_updated"]
commission <- map["age"]
price <- map["price"]
sku <- map["sku"]
product_id <- map["product_id"]
product_image <- map["product_image"]
product_name <- map["product_name"]
advertiser <- map["advertiser"]
designer <- map["designer"]
category <- map["category"]
每个实体类都实现了Mappable协议。这仅仅是JSON数据中的两个对象，现在我们要再声明下整个JSON数据的对象定义，它将作为顶层包含着Meta类和Product类：
Alamofire.request(Method.GET, "请求的地址", parameters: nil, encoding: ParameterEncoding.URL).responseObject { (response:ProductResponse?, error:NSError?) -> Void in
if let products = response?.products{
for p in products{
println(p.product_name)
}// end request
json到对象类，变的非常的简单～～
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