使用JSONKit将字符串，字典，数组转换成json格式

一，引入jsonkit

NSString *str = nil;//字符串NSMutableString *string = [[NSMutableString alloc] init];[string appendString:@"xxxx"];str = [string JSONString];NSLog(str1:%@,[NSString stringWithString:str]);数组NSArray *array = [[NSArray alloc] initWithObjects:111",333222 NSMutableArray *array = [NSMutableArray array];str = [array JSONString];NSLog(str2:%@字典NSArray *firstArr = [NSArray arrayWithObjects:firstsecond基本数据类型转换成NSNumber类型NSArray *secondArr = [NSArray arrayWithObjects:[NSNumber numberWithDouble:2.1],[NSNumber numberWithBool:NO],0)">加到字典中NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:firstArr,secondArr,0)">转化成json格式str = [dic JSONString];NSString *str2 = [NSString stringWithString:str];NSLog(str3:%@编码NSData *archive = [NSKeyedArchiver archivedDataWithRootObject:array]; NSLog(@"archive:%@",archive);NSArray *arr2 = [NSKeyedUnarchiver unarchiveObjectWithData:archive];NSLog(arr2:%@ 二，系统自带
 
 
 将数组转JSON- (NSData *)toJSONData:(id)theData{	NSError *error = nil;	NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData													 options:NSJSONWritingPrettyPrinted														 error:&error];	if ([jsonData length] > 0 && error == nil){		return jsonData;	}else{		 nil;	}}NSString *jsonString = [[NSString alloc] initWithData:jsonDataencoding:NSUTF8StringEncoding];