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JSon解析

2015-12-16 17:20 716 查看
1.使用JSONKit的解析方法:(需导入包:#import "JSONKit/JSONKit.h")

- (IBAction)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];
}

2.//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"]];

}

3.//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"]];
}

参照:http://www.cnblogs.com/jiangyuxuan/archive/2013/03/09/2950984.html
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