TouchJson、 SBJson 、JSONKit 和 iOS5所支持的原生的json方法，解析需要下载他们的库

首先建立一个新的工程，（注意不要选择ARC机制）添加如下控件：

  1. #import <UIKit/UIKit.h>  
  2.   
  3. @interface ViewController : UIViewController  
  4.   
  5. @property (retain, nonatomic) IBOutlet UITextView *txtView;  
  6.   
  7. - (IBAction)btnPressTouchJson:(id)sender;  
  8. - (IBAction)btnPressSBJson:(id)sender;  
  9. - (IBAction)btnPressIOS5Json:(id)sender;  
  10. - (IBAction)btnPressJsonKit:(id)sender;  

 

 
  1. //使用TouchJson来解析北京的天气  
  2. - (IBAction)btnPressTouchJson:(id)sender {  
  3.     //获取API接口  
  4.     NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101010100.html"];  
  5.     //定义一个NSError对象，用于捕获错误信息  
  6.     NSError *error;  
  7.     NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];  
  8.     NSLog(@"jsonString--->%@",jsonString);  
  9.     //将解析得到的内容存放字典中，编码格式为UTF8，防止取值的时候发生乱码  
  10.     NSDictionary *rootDic = [[CJSONDeserializer deserializer] deserialize:[jsonString dataUsingEncoding:NSUTF8StringEncoding] error:&error];  
  11.     //因为返回的Json文件有两层，去第二层内容放到字典中去  
  12.     NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"];  
  13.     NSLog(@"weatherInfo--->%@",weatherInfo);  
  14.     //取值打印  
  15.     txtView.text = [NSString stringWithFormat:@"今天是 %@  %@  %@  的天气状况是：%@  %@ ",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"], [weatherInfo objectForKey:@"weather1"], [weatherInfo objectForKey:@"temp1"]];  
  16.       
  17. }
  1. //使用SBJson解析南阳的天气  
  2. - (IBAction)btnPressSBJson:(id)sender {  
  3.     NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101180701.html"];  
  4.     NSError *error = nil;  
  5.     NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];  
  6.     SBJsonParser *parser = [[SBJsonParser alloc] init];  
  7.       
  8.     NSDictionary *rootDic = [parser objectWithString:jsonString error:&error];  
  9.     NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"];  
  10.     txtView.text = [NSString stringWithFormat:@"今天是 %@  %@  %@  的天气状况是：%@  %@ ",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"], [weatherInfo objectForKey:@"weather1"], [weatherInfo objectForKey:@"temp1"]];

 

  1. - (IBAction)btnPressIOS5Json:(id)sender {  
  2.       
  3.     NSError *error;  
  4.     //加载一个NSURL对象  
  5.     NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.weather.com.cn/data/101180601.html"]];  
  6.     //将请求的url数据放到NSData对象中  
  7.     NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];  
  8.     //IOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中  
  9.     NSDictionary *weatherDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];  
  10.     NSDictionary *weatherInfo = [weatherDic objectForKey:@"weatherinfo"];  
  11.     txtView.text = [NSString stringWithFormat:@"今天是 %@  %@  %@  的天气状况是：%@  %@ ",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"], [weatherInfo objectForKey:@"weather1"], [weatherInfo objectForKey:@"temp1"]];  
  12.     NSLog(@"weatherInfo字典里面的内容为--》%@", weatherDic );