1 前言
通过 NSJSONSerialization 这个类的 dataWithJSONObject:options:error:方法来实现,Array 和 dictionary 序列化成 JSON 对象。方便在网络中传输。
2 代码实例
TestDemo.m
[plain]
(void)converseToJson{
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setValue:@"Archy" forKey:@"First Name"];
[dictionary setValue:@"Robbins" forKey:@"Last Name"];
[dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
NSArray *arrayOfArchysChildren = [[NSArray alloc] initWithObjects:
@"Anthony's Son 1",
@"Anthony's Daughter 1",
@"Anthony's Son 2",
@"Anthony's Son 3",
@"Anthony's Daughter 2", nil];
[dictionary setValue:arrayOfArchysChildren forKey:@"children"];
NSError *error = nil;
//NSJSONWritingPrettyPrinted:指定生成的JSON数据应使用空格旨在使输出更加可读。如果这个选项是没有设置,最紧凑的可能生成JSON表示。
NSData *jsonData = [NSJSONSerialization
dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
if ([jsonData length] > 0 && error == nil){
NSLog(@"Successfully serialized the dictionary into data.");
//NSData转换为String
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(@"JSON String = %@", jsonString);
}
else if ([jsonData length] == 0 &&
error == nil){
NSLog(@"No data was returned after serialization.");
}
else if (error != nil){
NSLog(@"An error happened = %@", error);
}
}
-(void)converseToJson{
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setValue:@"Archy" forKey:@"First Name"];
[dictionary setValue:@"Robbins" forKey:@"Last Name"];
[dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
NSArray *arrayOfArchysChildren = [[NSArray alloc] initWithObjects:
@"Anthony's Son 1",
@"Anthony's Daughter 1",
@"Anthony's Son 2",
@"Anthony's Son 3",
@"Anthony's Daughter 2", nil];
[dictionary setValue:arrayOfArchysChildren forKey:@"children"];
NSError *error = nil;
//NSJSONWritingPrettyPrinted:指定生成的JSON数据应使用空格旨在使输出更加可读。如果这个选项是没有设置,最紧凑的可能生成JSON表示。
NSData *jsonData = [NSJSONSerialization
dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
if ([jsonData length] > 0 && error == nil){
NSLog(@"Successfully serialized the dictionary into data.");
//NSData转换为String
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(@"JSON String = %@", jsonString);
}
else if ([jsonData length] == 0 &&
error == nil){
NSLog(@"No data was returned after serialization.");
}
else if (error != nil){
NSLog(@"An error happened = %@", error);
}
}
控制台结果
2013-05-13 17:14:26.087 ToJsonTest[4890:303] Successfully serialized the dictionary into data.
2013-05-13 17:14:26.089 ToJsonTest[4890:303] JSON String = {
"children" : [
"Anthony's Son 1",
"Anthony's Daughter 1",
"Anthony's Son 2",
"Anthony's Son 3",
"Anthony's Daughter 2"
],
"Age" : 51,
"First Name" : "Archy",
"Last Name" : "Robbins"
}