IOS JSON解析

Json数据封包

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1. NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",@"value3",@"key3", nil];  
2.    // isValidJSONObject判断对象是否可以构建成json对象  
3.    if ([NSJSONSerialization isValidJSONObject:dic]){  
4.        NSError *error;  
5.        // 创造一个json从Data, NSJSONWritingPrettyPrinted指定的JSON数据产的空白，使输出更具可读性。  
6.        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&error];  
7.        NSString *json =[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];  
8.        NSLog(@"json data:%@",json);  
9.    }  

Json数据解析

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1. NSError *error;  
2.     //加载一个NSURL对象  
3.     NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.weather.com.cn/data/101120101.html"]];  
4.     //将请求的url数据放到NSData对象中  
5.     NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];  
6.     //IOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中  
7.     NSDictionary *weatherDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];  
8.     NSDictionary *weatherInfo = [weatherDic objectForKey:@"weatherinfo"];  
9.     NSString *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"]];  
10.     NSLog(@"weatherInfo：%@", text );