使用自定义
JsonSerializer。
public class Response { private String status; private String error; @JsonProperty("p") @JsonSerialize(using = CustomSerializer.class) private Object data; // ...}public class CustomSerializer extends JsonSerializer<Object> { public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException { jgen.writeStartObject(); jgen.writeObjectField(value.getClass().getName(), value); jgen.writeEndObject(); }}然后，假设您要序列化以下两个对象：
public static void main(String... args) throws Exception { ObjectMapper mapper = new ObjectMapper(); Response r1 = new Response("Error", "Some error", 20); System.out.println(mapper.writevalueAsString(r1)); Response r2 = new Response("Error", "Some error", "some string"); System.out.println(mapper.writevalueAsString(r2));}第一个将打印：
{"status":"Error","error":"Some error","p":{"java.lang.Integer":20}}第二个：
{"status":"Error","error":"Some error","p":{"java.lang.String":"some string"}}我使用了
p包装对象的名称，因为它仅用作
p花边固定器。如果要删除它，则必须为 整个
类编写一个自定义序列化程序，即一个
JsonSerializer<Response>。
