基于jsonkit，缓存（缓存对象 是服务器返回的整个json字符串）工具类，

#import "CacheUtil.h"

#import "JSONKit.h"

@implementation CacheUtil

//获得访问目录

+ (NSString*)documentPath

{

NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

return documentsDirectory;

}

／／写缓存

+ (void)writeCache:(id)json ofType:(NSString *)type

{

NSString* content = [json JSONString];

[content writeToFile:[[CacheUtildocumentPath] stringByAppendingPathComponent:type] atomically:YESencoding:NSUTF8StringEncodingerror:nil];

}

／／读缓存

+ (id)readCacheOfType:(NSString *)type

{

NSString* path = [[CacheUtildocumentPath] stringByAppendingPathComponent:type];

if (![[NSFileManagerdefaultManager] fileExistsAtPath:path]) {

return nil;

}

NSError* error;

NSData* content = [[NSData alloc] initWithContentsOfFile:path];

if (error) {

return nil;

}

id json = [content objectFromJSONData];

return json;

}

／／清除缓存

+ (void)clearCacheOfType:(NSString*)type

{

NSString* path = [[CacheUtildocumentPath] stringByAppendingPathComponent:type];

if ([[NSFileManagerdefaultManager] fileExistsAtPath:path]) {

[[NSFileManagerdefaultManager] removeItemAtPath:path error:nil];

}

}

@end