ios 中使用SBJson拼接和解析json

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:///

-(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:///