iOS  SBJson解析，拼接的用法

1.ios解析json 

使用开源json包，项目地址： 

     http://stig.github.com/json-framework/ 

NSData * responseData = [respones
responseData]; 

      

    
NSString * strResponser = [[NSString alloc]
initWithData:responseData
encoding:NSUTF8StringEncoding]; 

SBJsonParser * parser = [[SBJsonParser
alloc]init]; 

    
NSMutableDictionary *dicMessageInfo = [parser
objectWithString:strResponser]; //
解析成json解析对象 

[parser release]; 

    
//发送者 

    
NSString * sender = [dicMessageInfo
objectForKey:@"sender"]; 

2.json嵌套对象解析： 

//要上传的字符串 

    NSString
*dataStr=[[NSString alloc]
initWithString:@"{"cross":{"1":"true","2":"false","3":"true"}}"]; 

//获取响应返回字符串 

NSData * responseData = [respones
responseData]; 

        

       
NSString * strResponser = [[NSString alloc]
initWithData:responseData
encoding:NSUTF8StringEncoding]; 

//嵌套解析 

SBJsonParser * parser = [[SBJsonParser
alloc]init]; 

            

           
NSMutableDictionary *dicMessageInfo = [parser
objectWithString:strResponser]; //
解析成json解析对象 

            

           
NSMutableDictionary * cross = [dicMessageInfo
objectForKey:@"cross"]; 

            

           
NSString *cross1= [cross
objectForKey:@"1"]; 

           
//解析json到各个字符串 

           
//发送者 

           
[parser release]; 

           
NSLog(@"cross1: %@",cross1); 

3.拼接json字符串 

通过使用SBJson中的SBJsonWriter类的方法-
(NSString*)stringWithObject:(id)value可以将一个对象中的值格式化为json字符串，符合key/value格式的数据封装到NSDictionary后可以使用该方法进行格式化，其他数据通过拼接字符串的方式格式化。 

在拼接过程中可以使用类NSMutableString的方法： 

- (void)appendString:(NSString
*)aString;、 

- (void)appendFormat:(NSString *)format, ...
NS_FORMAT_FUNCTION(1,2); 

动态添加字符串。 

拼接的字符串可通过json在线验证的方式验证其格式是否正确，网址为： 
http://jsonlint.com/ 
-(NSString *) getJsonString 

{ 

   
NSMutableString *json = [NSMutableString
stringWithCapacity:128]; 

    NSString
*jsonString=nil; 

    SBJsonWriter
*writer = [[SBJsonWriter alloc]
init]; 

    [json
appendString:@"{"data":{"]; 

    [json
appendFormat:@""%@":"%d",",@"reset",reset]; 

   
if(missionStatus!=NULL) 

   
{ 

       
jsonString=[writer
stringWithObject:status]; 

       
if(jsonString!=NULL) 

       
{ 

           
[json
appendString:@""status":"]; 

           
[json appendString:jsonString]; 

       
} 

   
} 

    [json
appendString:@"}}"]; 

    return
json; 

} 

4.利用多个NSDictionary，拼接多层嵌套的json字符串，减少因手工拼接忘记加引号导致的json格式错误 

示例代码： 

NSDictionary *dataDictionary= [NSDictionary
dictionaryWithObjectsAndKeys:mac,@"mac", 

                                  
game,@"game", 

                                  
devicetoken,@"devicetoken", 

                                  
device,@"device", 

                                  
gv,@"gv", 

                                  
lang,@"lang", 

                                  
os,@"os", 

                                  
hardware,@"hardware", 

                                  
down,@"down",nil]; 

    NSDictionary
*parmDictionary= [NSDictionary
dictionaryWithObjectsAndKeys:@"getSession",@"act", 

                                  
dataDictionary,@"data",nil]; 

    NSDictionary
*jsonDictionary=[NSDictionary
dictionaryWithObjectsAndKeys:pv,@"pv", 

                                 
parmDictionary,@"param",nil]; 

    SBJsonWriter
*writer = [[SBJsonWriter alloc]
init]; 

    

    NSString
*jsonString=nil; 

   
jsonString=[writer
stringWithObject:jsonDictionary]; 

   
NSLog(@"%@",jsonString); 

5.json字符串在线校验网址： 
http://jsonlint.com/