JSONKit 使用示例

JSONKit是Object-C一个处理json数据的库，非常高效而且易用，对比同类型的库有非常明显的性能优势，见下图：

JSON和Object-C中数据类型的映射关系如下表所示

NumberArrayObject

JSON	Objective-C
`null`	`NSNull`
trueand`false`	NSNumber
String	NSString
NSArray
`NSDictionary`

下面写一个简单的程序使用一下JSONKit（只需下载头文件以及源文件，放在项目目录下）

[cpp] view plain copy

#import<Foundation/Foundation.h>
#import"lib/JSONKit.h"
intmain(intargc,constchar*argv[]){
NSAutoreleasePool*pool=[[NSAutoreleasePoolalloc]init];
NSString*res=nil;
/*
*json格式编码
*/
//字符串
NSString*str=@"thisisansstring";
res=[strJSONString];
NSLog(@"res=%@",[NSStringstringWithString:res]);
//res="thisisansstring"
//数组
NSArray*arr=[[NSArrayalloc]initWithObjects:@"One",@"Two",@"Three",nil];
res=[arrJSONString];
NSLog(@"res=%@",[NSStringstringWithString:res]);
[arrrelease];
//res=["One","Two","Three"]
//字典类型（对象）
NSArray*arr1=[NSArrayarrayWithObjects:@"dog",@"cat",nil];
NSArray*arr2=[NSArrayarrayWithObjects:[NSNumbernumberWithBool:YES],[NSNumbernumberWithInt:30],nil];
NSDictionary*dic=[NSDictionarydictionaryWithObjectsAndKeys:arr1,@"pets",arr2,@"other",nil];
res=[dicJSONString];
NSLog(@"res=%@",[NSStringstringWithString:res]);
//res={"pets":["dog","cat"],"other":[true,30]}
/*
*json格式解码
*/
JSONDecoder*jd=[[JSONDecoderalloc]init];
//针对NSData数据
NSData*data=[dicJSONData];
NSDictionary*ret=[jdobjectWithData:data];
NSLog(@"res=%@",[retobjectForKey:@"pets"]);
//res=(
//dog,
//cat
//)
NSLog(@"res=%@",[[retobjectForKey:@"other"]objectAtIndex:0]);
//res=1
//针对NSString字符串数据
NSString*nstr=[dicJSONString];
NSDictionary*ret2=[jdobjectWithUTF8String:(constunsignedchar*)[nstrUTF8String]length:(unsignedint)[nstrlength]];
NSLog(@"res=%d",[[ret2objectForKey:@"pets"]indexOfObject:@"cat"]);
//res=1
NSLog(@"res=%@",[[ret2objectForKey:@"other"]objectAtIndex:1]);
//res=30
[jdrelease];
[pooldrain];
return0;
}

JSONKit的接口中还可以自行定制序列化和反序列化选项

JSONKit 使用示例

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