- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    self.title=@"NSJSONSerialization";

    [self initJson];

}

-(void)initJson

{

    NSDictionary* jsonDic = [NSDictionary dictionaryWithObjectsAndKeys:@"李小华",@"name",@"女",@"sex",@"23",@"age",@"BeiJing",@"from",nil];

    NSLog(@"-------------jsonDic--%@",jsonDic);

    //将Dic转为NSData

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDic options:NSJSONWritingPrettyPrinted error:nil];

    //将NSData转为字符串

    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

    NSLog(@"--jsonString--%@",jsonString);

    NSLog(@"--jsonData---%@",jsonData);

}

2015-10-22 15:04:05.112 NSJSONSerializationDemo[13058:272541] -------------jsonDic--{

    age = 23;

    from = BeiJing;

    name = "\U674e\U5c0f\U534e";

    sex = "\U5973";

}

2015-10-22 15:04:05.113 NSJSONSerializationDemo[13058:272541] --jsonString--{

  "age" : "23",

  "sex" : "女",

  "name" : "李小华",

  "from" : "BeiJing"

}

2015-10-22 15:04:05.113 NSJSONSerializationDemo[13058:272541] --jsonData---<7b0a2020 22616765 22203a20 22323322 2c0a2020 22736578 22203a20 22e5a5b3 222c0a20 20226e61 6d652220 3a2022e6 9d8ee5b0 8fe58d8e 222c0a20 20226672 6f6d2220 3a202242 65694a69 6e67220a 7d>