sbjson的解析

1，访问 SBJson的项目官网，并且下载https://github.com/stig/json-framework/downloads

注意:按照作者的说明，

SBJson v3.1alpha3 - source and API docs for Mac and iOS development,now with ARC support!

只有在3.1的版本上，才支持xcode 4.2中开启ARC的功能。所以我使用这个版本。

2.依然采用源代码编译的方式。把SBJson下载后解开的 目录中的classes目录拖拉到 项目中。

3.在项目的h文件中引入#import "SBJson.h"。不再使用#import "JSON.h"

4.测试用的json字符串是： {"userInfo":{"userName":"徐泽宇","sex":"男"}}

5.测试代码是 ：

[cpp] view plain copy

1. //测试json的解析
2. -(void)testJsonParser:(NSString*)jsonString
3. {
4. jsonString=[[NSStringalloc]initWithString:@"{\"userInfo\":{\"userName\":\"徐泽宇\",\"sex\":\"男\"}}"];
5. NSLog(@"正在解析json字符串是：%@",jsonString);
7. SBJsonParser*parser=[[SBJsonParseralloc]init];
8. NSError*error=nil;
9. NSMutableDictionary*jsonDic=[parserobjectWithString:jsonStringerror:&error];
10. NSMutableDictionary*dicUserInfo=[jsonDicobjectForKey:@"userInfo"];
12. NSLog(@"%@",[jsonDicobjectForKey:@"userInfo"]);
13. NSLog(@"%@",[dicUserInfoobjectForKey:@"userName"]);
14. "sex"]);
15. }

控制台打印的内容如下:

2011-11-29 02:56:04.882 IManager[4040:fb03] {
sex = "\U7537";
userName = "\U5f90\U6cfd\U5b87";
}
2011-11-29 02:56:04.887 IManager[4040:fb03] 徐泽宇
2011-11-29 02:56:04.888 IManager[4040:fb03] 男

注意：这里的json的字符串。一定要用双引号，不能使用单引号。这点上和java的类包是有区别的。这个问题浪费了我1个小时。

处理json对象有多个记录的方法。

json字符串是：

{"customer":[{"name":"roamer","ycount":"232.4","sumcount":"322.3"},{"name":"王三","ycount":"221.2","sumcount":"1123.2"},{"name":"李四","ycount":"1221.2","sumcount":"12123.2"}]}

copy

+(void)test{
1. DLog(@"test开始运行");
2. NSString*customerGridJsonString=[[NSStringalloc]initWithString:@"{\"customer\":[{\"name\":\"roamer\",\"ycount\":\"232.4\",\"sumcount\":\"322.3\"},{\"name\":\"王三\",\"ycount\":\"221.2\",\"sumcount\":\"1123.2\"},{\"name\":\"李四\",\"ycount\":\"1221.2\",\"sumcount\":\"12123.2\"}]}"];
3. DLog(@"%@",customerGridJsonString);
4. NSError*error=nil;
5. NSMutableDictionary*root=[[NSMutableDictionaryalloc]initWithDictionary:[parserobjectWithString:customerGridJsonStringerror:&error]];
6. //注意转换代码
7. SBJsonWriter*jsonWriter=[[SBJsonWriteralloc]init];
8. NSString*jsonString=[jsonWriterstringWithObject:root];
9. [jsonWriterrelease];
10. //注意转换代码
11. NSMutableArray*customers=[rootobjectForKey:@"customer"];
12. DLog(@"%@",customers);
13. for(NSMutableDictionary*memberincustomers)
14. "name"]description]);
15. }

16. 
    控制台输出是:

    2012-04-22 13:55:41.845 iQuestionnaire[13464:fb03] test开始运行

    2012-04-22 13:55:41.846 iQuestionnaire[13464:fb03] {"customer":[{"name":"roamer",{"name":"王三",{"name":"李四","sumcount":"12123.2"}]}

    
    

    2012-04-22 13:55:41.854 iQuestionnaire[13464:fb03] {"customer":[{"sumcount":"322.3","name":"roamer","ycount":"232.4"},{"sumcount":"1123.2","name":"王三","ycount":"221.2"},{"sumcount":"12123.2","name":"李四","ycount":"1221.2"}]}

    [

    2012-04-22 13:55:41.854 iQuestionnaire[13464:fb03] (

    {

    name = roamer;

    sumcount = "322.3";

    ycount = "232.4";

    },

    name = "\U738b\U4e09";

    sumcount = "1123.2";

    ycount = "221.2";

    name = "\U674e\U56db";

    sumcount = "12123.2";

    ycount = "1221.2";

    }

    )

    2012-04-22 13:55:41.854 iQuestionnaire[13464:fb03] roamer

    2012-04-22 13:55:41.856 iQuestionnaire[13464:fb03]王三

    2012-04-22 13:55:41.856 iQuestionnaire[13464:fb03]李四

    注意这里的转换代码： 如果直接使用

    NSMutableDictionary*root 来获得 字符串，将会对json字串产生以下变化

    1. 中文问题

    2.加入了（）符号

    3.所有的： 变成了 =

    要避免这个问题的产生，需要用

    SBJsonWriter*jsonWriter = [[SBJsonWriteralloc]init];

    NSString*jsonString = [jsonWriterstringWithObject:root];

    [jsonWriterrelease];

    
    

    这段代码来把NSMutableDictionary 转成 NSString