（1）使用TouchJSon解析方法：（需导入包：#import "TouchJson/JSON/CJSONDeserializer.h"）
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"] 16 ,[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"],[weatherInfo objectForKey:@"weather1"] 17 ,[weatherInfo objectForKey:@"temp1"]]; 18 }
（2）使用SBJson解析方法：（需导入包：#import "SBJson/SBJson.h"）
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"] 11 ,[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"],[weatherInfo objectForKey:@"weather1"] 12 ,[weatherInfo objectForKey:@"temp1"]]; 13 }
（3）使用IOS5自带解析类NSJSONSerialization方法解析：（无需导入包，IOS5支持，低版本IOS不支持）
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"] 12 ,[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"],[weatherInfo objectForKey:@"weather1"] 13 ,[weatherInfo objectForKey:@"temp1"]]; 14 NSLog(@"weatherInfo字典里面的内容为--》%@", weatherDic ); 15 }
（4）使用JSONKit的解析方法：（需导入包：#import "JSONKit/JSONKit.h"）
1 - (void)btnPressJsonKit:(id)sender { 2 //如果json是“单层”的，即value都是字符串、数字，可以使用 objectFromJSONString 3 NSString *json1 = @"{"a":123, "b":"abc"}"; 4 NSLog(@"json1:%@",json1); 5 NSDictionary *data1 = [json1 objectFromJSONString]; 6 NSLog(@"json1.a:%@",[data1 objectForKey:@"a"]); 7 NSLog(@"json1.b:%@",[data1 objectForKey:@"b"]); 8 [json1 release]; 9 //如果json有嵌套，即value里有array、object，如果再使用objectFromJSONString，程序可能会报错 10 //（测试结果表明：使用由网络或得到的php/json_encode生成的json时会报错，但使用NSString定义的json字符串时，解析成功），最好使用objectFromJSONStringWithParseOptions： 11 NSString *json2 = @"{"a":123, "b":"abc", "c":[456, "hello"], "d":{"name":"张三", "age":"32"}}"; 12 NSLog(@"json2:%@", json2); 13 NSDictionary *data2 = [json2 objectFromJSONStringWithParseOptions:JKParseOptionLooseUnicode]; 14 NSLog(@"json2.c:%@", [data2 objectForKey:@"c"]); 15 NSLog(@"json2.d:%@", [data2 objectForKey:@"d"]); 16 [json2 release]; 17 }