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iOS5.0新功能之——NSJSONSerialization解析JSON数据

2011-12-28 16:43  张智清  阅读(9869)  评论(0编辑  收藏  举报

以下是用于保存

View Code
 1 - (IBAction)touchWriteButton:(id)sender {
2 NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
3 [dictionary setValue:@"Anthony" forKey:@"First Name"];
4 [dictionary setValue:@"Robbins" forKey:@"Last Name"];
5 [dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
6 NSArray *arrayOfAnthonysChildren = [[NSArray alloc] initWithObjects:@"Anthony's Son 1", @"Anthony's Daughter 1", @"Anthony's Son 2", @"Anthony's Son 3", @"Anthony's Daughter 2", nil];
7 [dictionary setValue:arrayOfAnthonysChildren forKey:@"children"];
8 NSError *error = nil;
9 NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
10 if (error) {
11 NSLog(@"dic->%@",error);
12 }
13 [dictionary release];
14 BOOL succeed = [jsonData writeToFile:JSON_PATH atomically:YES];
15 if (succeed) {
16 NSLog(@"Save succeed");
17 }else {
18 NSLog(@"Save fail");
19 }
20 }

下面是读取方式:

View Code
 1 - (IBAction)touchReadButton:(id)sender { 
2 NSData *jsonData = [[NSData alloc] initWithContentsOfFile:JSON_PATH]; /* Now try to deserialize the JSON object into a dictionary */
3 NSError *error = nil;
4 id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:&error];
5 if (jsonObject != nil && error == nil){
6 NSLog(@"Successfully deserialized...");
7 if ([jsonObject isKindOfClass:[NSDictionary class]]){
8 NSDictionary *deserializedDictionary = (NSDictionary *)jsonObject;
9 NSLog(@"Dersialized JSON Dictionary = %@", deserializedDictionary);
10 } else if ([jsonObject isKindOfClass:[NSArray class]]){
11 NSArray *deserializedArray = (NSArray *)jsonObject;
12 NSLog(@"Dersialized JSON Array = %@", deserializedArray);
13 } else {
14 NSLog(@"An error happened while deserializing the JSON data.");
15 }
16 }
17 [jsonData release];
18 }