1 前言
通过 NSJSONSerialization 这个类的 JSONObjectWithData:options:error:方法来实现，把JSON 数据解析出来放在数据或者字典里面保存。
2 代码示例
TestDemo.m
[plain]
-(void)convseFromJson{
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setValue:@"Anthony" forKey:@"First Name"];
[dictionary setValue:@"Robbins" forKey:@"Last Name"];
[dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
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];
[dictionary setValue:arrayOfAnthonysChildren forKey:@"children"];
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization
dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
if ([jsonData length] > 0 && error == nil){
NSLog(@"Successfully serialized the dictionary into data.");
/* Json转数组/字典 */
error = nil;
//转换方法
id jsonObject = [NSJSONSerialization
JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments
error:&error];
if (jsonObject != nil && error == nil){
NSLog(@"Successfully deserialized...");
//如果jsonObject是字典类
if ([jsonObject isKindOfClass:[NSDictionary class]]){
NSDictionary *deserializedDictionary = (NSDictionary *)jsonObject;
NSLog(@"Dersialized JSON Dictionary = %@", deserializedDictionary);
}
//如果jsonObject是数组类
else if ([jsonObject isKindOfClass:[NSArray class]]){
NSArray *deserializedArray = (NSArray *)jsonObject;
NSLog(@"Dersialized JSON Array = %@", deserializedArray);
} else {
NSLog(@"I can't deal with it");
}
}
else if (error != nil){
NSLog(@"An error happened while deserializing the JSON data."); }
}
else if ([jsonData length] == 0 &&error == nil){
NSLog(@"No data was returned after serialization.");
}
else if (error != nil){
NSLog(@"An error happened = %@", error);
}
}
-(void)convseFromJson{
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setValue:@"Anthony" forKey:@"First Name"];
[dictionary setValue:@"Robbins" forKey:@"Last Name"];
[dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
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];
[dictionary setValue:arrayOfAnthonysChildren forKey:@"children"];
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization
dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
if ([jsonData length] > 0 && error == nil){
NSLog(@"Successfully serialized the dictionary into data.");
/* Json转数组/字典 */
error = nil;
//转换方法
id jsonObject = [NSJSONSerialization
JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments
error:&error];
if (jsonObject != nil && error == nil){
NSLog(@"Successfully deserialized...");
//如果jsonObject是字典类
if ([jsonObject isKindOfClass:[NSDictionary class]]){
NSDictionary *deserializedDictionary = (NSDictionary *)jsonObject;
NSLog(@"Dersialized JSON Dictionary = %@", deserializedDictionary);
}
//如果jsonObject是数组类
else if ([jsonObject isKindOfClass:[NSArray class]]){
NSArray *deserializedArray = (NSArray *)jsonObject;
NSLog(@"Dersialized JSON Array = %@", deserializedArray);
} else {
NSLog(@"I can't deal with it");
}
}
else if (error != nil){
NSLog(@"An error happened while deserializing the JSON data."); }
}
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 17:26:15.726 FromJsonTest[4944:303] Successfully serialized the dictionary into data.
2013-05-13 17:26:15.728 FromJsonTest[4944:303] Successfully deserialized...
2013-05-13 17:26:15.728 FromJsonTest[4944:303] Dersialized JSON Dictionary = {
Age = 51;
"First Name" = Anthony;
"Last Name" = Robbins;
children = (
"Anthony's Son 1",
"Anthony's Daughter 1",
"Anthony's Son 2",
"Anthony's Son 3",
"Anthony's Daughter 2"
);