如何在序列化期间忽略字段，而不是在反序列化期间忽略？

Question

I have a POJO class

class Human{
    String name;
    Integer age;
    //get and set
}

When I deserialize json to a Human object I want to read both fields ( age and name values). But when I serialize a Human object to json I want to ignore age .

Is this possible ?

Answer 1

The javadoc of @JsonIgnore states

In addition, starting with Jackson 1.9, if this is the only annotation associated with a property, it will also cause cause the whole property to be ignored: that is, if setter has this annotation and getter has no annotations, getter is also effectively ignored. It is still possible for different accessors to use different annotations; so if only "getter" is to be ignored, other accessors (setter or field) would need explicit annotation to prevent ignoral (usually JsonProperty).

So just annotate the getter and setter appropriately

// for serialization
@JsonIgnore 
public String getName() {
    return name;
}
// for deserialization
@JsonProperty("name")
public void setName(String name) {
    this.name = name;
}