iOS學習筆記（十一）——JSON資料解析

 

Json資料封包

 NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",@"value3",@"key3", nil];    // isValidJSONObject判斷對象是否可以構建成json對象    if ([NSJSONSerialization isValidJSONObject:dic]){        NSError *error;        // 創造一個json從Data, NSJSONWritingPrettyPrinted指定的JSON資料產的空白，使輸出更具可讀性。        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&error];        NSString *json =[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];        NSLog(@"json data:%@",json);    }

 Json資料解析

NSError *error;    //載入一個NSURL對象    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.weather.com.cn/data/101120101.html"]];    //將請求的url資料放到NSData對象中    NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    //IOS5內建解析類NSJSONSerialization從response中解析出資料放到字典中    NSDictionary *weatherDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];    NSDictionary *weatherInfo = [weatherDic objectForKey:@"weatherinfo"];    NSString *text = [NSString stringWithFormat:@"今天是 %@  %@  %@  的天氣狀況是：%@  %@ ",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"], [weatherInfo objectForKey:@"weather1"], [weatherInfo objectForKey:@"temp1"]];    NSLog(@"weatherInfo：%@", text );

@張興業TBOW

參考：

http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40010946-CH1-DontLinkElementID_1

http://www.w3school.com.cn/json/

http://www.ibm.com/developerworks/cn/web/wa-lo-json/

http://blog.sina.com.cn/s/blog_7018d3820101bdqz.html