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
JSON |
Objective-C |
null |
NSNull |
trueandfalse |
NSNumber |
Number
String |
NSString |
Array
NSArray |
Object
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)
- #import<Foundation/Foundation.h>
- #import"lib/JSONKit.h"
- intmain(intargc,constchar*argv[]){
- NSAutoreleasePool*pool=[[NSAutoreleasePoolalloc]init];
- NSString*res=nil;
- NSString*str=@"thisisansstring";
- res=[strJSONString];
- NSLog(@"res=%@",[NSStringstringWithString:res]);
- NSArray*arr=[[NSArrayalloc]initWithObjects:@"One",@"Two",@"Three",nil];
- res=[arrJSONString];
- NSLog(@"res=%@",[NSStringstringWithString:res]);
- [arrrelease];
- 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]);
- JSONDecoder*jd=[[JSONDecoderalloc]init];
- NSData*data=[dicJSONData];
- NSDictionary*ret=[jdobjectWithData:data];
- NSLog(@"res=%@",[retobjectForKey:@"pets"]);
- NSLog(@"res=%@",[[retobjectForKey:@"other"]objectAtIndex:0]);
- NSString*nstr=[dicJSONString];
- NSDictionary*ret2=[jdobjectWithUTF8String:(constunsignedchar*)[nstrUTF8String]length:(unsignedint)[nstrlength]];
- NSLog(@"res=%d",[[ret2objectForKey:@"pets"]indexOfObject:@"cat"]);
- NSLog(@"res=%@",[[ret2objectForKey:@"other"]objectAtIndex:1]);
- [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 (编辑:李大同)
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