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  • [转]IOS开发中四种解析Json的方法

    本文将介绍TouchJson、 SBJson 、JSONKit 和 iOS5所支持的原生的json方法,解析国家气象局API,TouchJson和SBJson需要下载他们的库

    TouchJson包下载: http://download.csdn.net/detail/enuola/4523169

    SBJson 包下载: http://download.csdn.net/detail/enuola/4523177

    JSONKit包下载:http://download.csdn.net/detail/enuola/4523160

    下面的完整程序源码包下载:http://download.csdn.net/detail/enuola/4523223

    (1)使用TouchJSon解析方法:(需导入包:#import “TouchJson/JSON/CJSONDeserializer.h”)

    Objective-C

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    //使用TouchJson来解析北京的天气

    • (void)btnPressTouchJson:(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,编码格式为UTF8,防止取值的时候发生乱码
      NSDictionary *rootDic = [[CJSONDeserializer deserializer] deserialize:[jsonString dataUsingEncoding:NSUTF8StringEncoding] error:&error];
      //因为返回的Json文件有两层,去第二层内容放到字典中去
      NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"];
      NSLog(@"weatherInfo--->%@",weatherInfo);
      //取值打印
      NSString *detail = [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"]];
      NSLog(@"%@",detail);
      }
      (2)使用 SBJson解析方法:(需导入包:#import “SBJson/SBJson.h”)

    Java

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    //使用SBJson解析南阳的天气

    • (void)btnPressSBJson:(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"];
      NSString *detail = [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"]];
      NSLog(@"%@",detail);
      }
      (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)

    Java

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    • (void)btnPressIOS5Json:(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];
      NSDictionary *weatherInfo = [weatherDic objectForKey:@"weatherinfo"];
      NSString *detail = [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"]];
      NSLog(@"%@",detail);
      NSLog(@"weatherInfo字典里面的内容为--》%@", weatherDic );

    }
    (4)使用 JSONKit的解析方法:(需导入包:#import “JSONKit/JSONKit.h”)

    Objective-C

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    • (void)btnPressJsonKit:(id)sender {

      //如果json是“单层”的,即value都是字符串、数字,可以使用objectFromJSONString
      NSString *json1 = @"{"a":123, "b":"abc"}";
      NSLog(@"json1:%@",json1);
      NSDictionary *data1 = [json1 objectFromJSONString];
      NSLog(@"json1.a:%@",[data1 objectForKey:@"a"]);
      NSLog(@"json1.b:%@",[data1 objectForKey:@"b"]);
      [json1 release];

      //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
      //(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:
      NSString *json2 = @"{"a":123, "b":"abc", "c":[456, "hello"], "d":{"name":"张三", "age":"32"}}";
      NSLog(@"json2:%@", json2);
      NSDictionary *data2 = [json2 objectFromJSONStringWithParseOptions:JKParseOptionLooseUnicode];
      NSLog(@"json2.c:%@", [data2 objectForKey:@"c"]);
      NSLog(@"json2.d:%@", [data2 objectForKey:@"d"]);
      [json2 release];
      }

    原文链接:http://www.itjhwd.com/ios_json_jx/

    On the road。。。
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  • 原文地址:https://www.cnblogs.com/ianhao/p/4550733.html
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