iOS三种Json方法解析国家气象局API

博客http://blog.csdn.net/duxinfeng2010/article/details/7842210TouchJson库解析
- (IBAction)buttonPressedone:(id)sender {
//    获取API接口
    NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101010100.html"];
//    定义一个NSError对象，用于捕获错误信息
    NSError *error;
//    
    NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];    
//    NSLog(@"jsonstring--->%@",jsonString);
//    将解析得到的内容存放字典中，编码格式UTF8，防止取值时候发生乱码
    NSDictionary *rootDic = [[CJSONDeserializer deserializer] deserialize:[jsonString dataUsingEncoding:NSUTF8StringEncoding] error:&error];
//    因为返回的Json文件有两层，去第二层类容放到字典中去0
    NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"];
//    取值打印
    NSLog(@"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"]);}SBJson库解析- (IBAction)buttonPressedtwo:(id)sender {
    NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101180701.html"];
    NSError *error=nil;
    NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];  
    SBJsonParser *parser = [[SBJsonParser alloc]init];
    
    NSDictionary *rootDic = [parser objectWithString:jsonString error:&error];
    NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"];
    
    NSLog(@"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"]);
    
}iOS5自带解析类解析
- (IBAction)buttonPressedthree:(id)sender {
    NSError *error;
//    加载一个NSURL对象
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.weather.com.cn/data/101180601.html"]];
//    将请求的url数据放到NSData对象中
    NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
//    iOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中
    NSDictionary *weatherDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];
//    weatherDic字典中存放的数据也是字典型，从它里面通过键值取值
    NSDictionary *weatherInfo = [weatherDic objectForKey:@"weatherinfo"];
    
    NSLog(@"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"]);
//    打印出weatherInfo字典所存储数据
    NSLog(@"weatherInfo字典里面的内容是--->%@",[weatherInfo description]);
}