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IOS开发之——四种方法解析Json数据(转)

2014-05-04 10:13 405 查看
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")

//使用TouchJson来解析北京的天气
- (IBAction)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
    txtView.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"]];
}

(2)使用SBJson解析方法:(需导入包:#import "SBJson/SBJson.h")
//使用SBJson解析南阳的天气
- (IBAction)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"];
    txtView.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"]];
}

(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)
- (IBAction)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"];
    txtView.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"]];
    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")

- (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];
}
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