此外，当使用MapmyVariable（如文档中所述）来命名null时，您必须更改方法：

From documentation:
com.fasterxml.jackson.annotation.JsonInclude

@JacksonAnnotation
@Target(value={ANNOTATION_TYPE, FIELD, METHOD, PARAMETER, TYPE})
@Retention(value=RUNTIME)
Annotation used to indicate when value of the annotated property (when used for a field, method or constructor parameter), or all properties of the annotated class, is to be serialized. Without annotation property values are always included, but by using this annotation one can specify simple exclusion rules to reduce amount of properties to write out.

*Note that the main inclusion criteria (one annotated with value) is checked on Java object level, for the annotated type, and NOT on JSON output -- so even with Include.NON_NULL it is possible that JSON null values are output, if object reference in question is not `null`. An example is java.util.concurrent.atomic.AtomicReference instance constructed to reference null value: such a value would be serialized as JSON null, and not filtered out.

To base inclusion on value of contained value(s), you will typically also need to specify content() annotation; for example, specifying only value as Include.NON_EMPTY for a {link java.util.Map} would exclude Maps with no values, but would include Maps with `null` values. To exclude Map with only `null` value, you would use both annotations like so:
public class Bean {
   @JsonInclude(value=Include.NON_EMPTY, content=Include.NON_NULL)
   public Map<String,String> entries;
}

Similarly you could Maps that only contain "empty" elements, or "non-default" values (see Include.NON_EMPTY and Include.NON_DEFAULT for more details).
In addition to `Map`s, `content` concept is also supported for referential types (like java.util.concurrent.atomic.AtomicReference). Note that `content` is NOT currently (as of Jackson 2.9) supported for arrays or java.util.Collections, but supported may be added in future versions.
Since:
2.0

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonInclude(JsonInclude.Include.NON_EMPTY)

应该起作用。

Include.NON_EMPTY表示如果属性的值不为null且不为空，则该属性将被序列化。Include.NON_NULL表示如果属性的值不为空，则该属性被序列化。

您可以设置application.properties：

spring.jackson.default-property-inclusion=non_null

或application.yaml：

spring:
  jackson:
    default-property-inclusion: non_null

http://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html

如果您试图序列化一个对象列表，其中一个对象为空，那么即使使用

mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

将导致：

[{myObject},null]

要获取此信息：

[{myObject}]

可以执行以下操作：

mapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
        @Override
        public void serialize(Object obj, JsonGenerator jsonGen, SerializerProvider unused)
                throws IOException
        {
            //IGNORES NULL VALUES!
        }
    });

提示：如果您使用的是DropWizard，则可以使用environment.getObjectMapper（）检索Jersey正在使用的ObjectMapper

就我而言

@JsonInclude(Include.NON_EMPTY)

让它发挥作用。

案例一

@JsonInclude(JsonInclude.Include.NON_NULL)
private String someString;

案例二

@JsonInclude(JsonInclude.Include.NON_EMPTY)
private String someString;

如果someString为空，则在这两种情况下都将忽略它。如果someString为“”，则只能在第二种情况下忽略。

对于List=null或List.size（）=0也是如此