您的位置:首页 > 移动开发 > IOS开发

[转]IOS开发中四种解析Json的方法

2015-06-04 00:55 423 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”)

Objective-C

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

//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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

//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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

(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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

(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/
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: