Jackson 序列化后功能

Question

我在同一个对象中序列化多个列表，并希望clear()在对象序列化后调用所有列表。

当前的方法是在序列化后在每个列表上手动调用 clear() 但我希望有更强大的方法，例如使用自定义JsonSerializer或AtomicReference.

我几乎没有经验，JsonSerializer希望有人能提供一个例子来实现这一点。

public class ResetSerializer extends JsonSerializer<Collection> {

    @Override

    public void serialize(Collection t, JsonGenerator jg, SerializerProvider sp) throws IOException {

        if (t != null) {

            String jsonList = ???; // how do I generate the JSON output of this list with a custom serializer?

            t.clear();

            return jsonList;

       }

    }

}

Answer 1

类似于以下内容：public class ResetSerializer extends JsonSerializer<Collection> {&nbsp; &nbsp; @Override&nbsp; &nbsp; public void serialize(Collection t, JsonGenerator jg, SerializerProvider sp) throws IOException {&nbsp; &nbsp; &nbsp; &nbsp; if (t != null) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; jg.writeStartArray();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (Object o: t) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;jg.writeObject(o);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; jg.writeEndArray();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.clear();&nbsp; &nbsp; &nbsp; &nbsp;}&nbsp; &nbsp; }}请注意，此方法具有void返回类型，即不期望返回某些内容。它应用在对象的序列化版本中写入的副作用。