#import "NSDataToDictionaryTools.h"@implementation NSDataToDictionaryTools+(NSData *)NSDictionaryToNSData:(NSDictionary *)dictionary{    NSMutableData *data =http://www.mamicode.com/ [[NSMutableData alloc] init];    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    [archiver encodeObject:dictionary forKey:@"KeyValue"];    [archiver finishEncoding];        return data;}+(NSString *)NSDictionaryToJSON:(NSDictionary *)dictionary{    NSData *prettyJson = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:nil];    NSString *jsonstr = [self NSDataToNSString:prettyJson];    return  jsonstr;}+(NSDictionary *)NSDataToNSDictionary:(NSData *)data{    //NSData-->NSDictionary    NSDictionary *myDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];        //NSData-->NSDictionary//    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];//    NSDictionary *myDictionary = [unarchiver decodeObjectForKey:@"KeyValue"];//    [unarchiver finishDecoding];        return myDictionary;}//NSString和NSData转换（即可作json串互相转换）+(NSString *)NSDataToNSString:(NSData *)data{    //NSData－> NSString    NSString *myString = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];    return myString;        //NSString－>NSData    //NSString *aString = @"我是NSString";    //NSData *testData = http://www.mamicode.com/[testString dataUsingEncoding: NSUTF8StringEncoding];}@end