使用JSONKit将字符串，字典，数组转换成json格式

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",@"333",@"222",nil];
// NSMutableArray *array = [NSMutableArray array];
str = [array JSONString];
NSLog(@"str2:%@",[NSString stringWithString:str]);
[array release ];

//字典
NSArray *firstArr = [NSArray arrayWithObjects:@"first",@"second",nil];
//基本数据类型转换成NSNumber类型
NSArray *secondArr = [NSArray arrayWithObjects:[NSNumber numberWithDouble:2.1],[NSNumber numberWithBool:NO],nil];
//加到字典中
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:firstArr,@"first",secondArr,nil];
//转化成json格式
str = [dic JSONString];
NSString *str2 = [NSString stringWithString:str];
NSLog(@"str3:%@",str2);

//编码
NSData *archive = [NSKeyedArchiver archivedDataWithRootObject:array];
//    NSLog(@"archive:%@",archive);
NSArray *arr2 = [NSKeyedUnarchiver unarchiveObjectWithData:archive];
NSLog(@"arr2:%@",arr2);

（编辑：李大同）

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