Swift 读取，处理Json数据

/*
{
"id": "001",
"name": "xyz",
"data": ["100", "220", "300", "400"]
}
*/

//从一个本地项目资源中读取data.Json文件
var path: String = NSBundle.mainBundle().pathForResource("data", ofType: "Json")!
var nsUrl = NSURL(fileURLWithPath: path)
var nsData: NSData = NSData(contentsOfURL: nsUrl!)!

//读取Json数据
var json: AnyObject? = NSJSONSerialization.JSONObjectWithData(nsData, options: NSJSONReadingOptions.allZeros, error:nil)

//读取普通数据
var id: String = json?.objectForKey("id") as String
println(id)

//读取数组类型数据
var array: [String] = json?.objectForKey("data") as [String]
println(array.count)

//额外的注意事项
if let name = json?.objectForKey("name") {
//在使用if let语句的时候，swift会自动进行拆包
println(name) //=> 此处显示的是zyx
}

//这个则不会自然拆包
let name1 = json?.objectForKey("name")
println(name1) //=> 此处显示的是Optional(zyx)

//简单的Json ＝》 文本转换
var dict = ["id":"002", "name": "abc"]

var jsonDict = NSJSONSerialization.dataWithJSONObject(dict, options: NSJSONWritingOptions.allZeros, error: nil)

//直接写入文件
jsonDict?.writeToFile("/正确路径/test.json", atomically: true)

//也可以把Json转换为String字符串
var str = NSString(data: jsonDict!, encoding: NSUTF8StringEncoding)