Json解析

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 );