java 序列化忽略属性,在Java中的Jackson JSON反序列化过程中忽略缺少的属性

In the example

class Person {

String name;

int age;

}

If the JSON object has a missing property 'age',

{

name : John

}

Person person = objectMapper.readValue(jsonFileReader, Person.class);

it throws a JsonMappingException saying it cannot deserialize. Is there an annotation to ignore missing fields during deserialization?

Thanks

解决方案

I think what you want is

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)

public class Person {

...

}

that's the Jackson 1.x way. I think there's a new way in 2.x. Something like

@JsonInclude(Include.NON_NULL)

public class Person {

...

}

These will tell Jackson to only serialize values that are not null, and don't complain when deserializing a missing value. I think it will just set it to the Java default.