使用springboot中注解：
在需要过滤的字段上或实体类上面添加：
//枚举值：ALWAYS,NON_NULL,NON_ABSENT,NON_EMPTY,NON_DEFAULT,CUSTOM,USE_DEFAULTS
@JsonInclude(Include.NON_EMPTY)其它参数：
-
//将该标记放在属性上，如果该属性为NULL则不参与序列化 -
//如果放在类上边,那对这个类的全部属性起作用 -
//Include.ALWAYS 默认 -
//Include.NON_DEFAULT 属性为默认值不序列化 -
//Include.NON_EMPTY 属性为空（“”）或者为 NULL 都不序列化 -
//Include.NON_NULL 属性为NULL 不序列化
例如：当该类中的属性为null或为空时，将以json返回对象序列化时这些属性不会序列化。
@JsonInclude(Include.NON_EMPTY)
public class GetLabelDataVO {private String labelNumber;private List<TaskWorkingRecord> taskWorkingRecords;private List<CountAnswer> countAnswers;public String getLabelNumber() {return labelNumber;}public void setLabelNumber(String labelNumber) {this.labelNumber = labelNumber;}public List<TaskWorkingRecord> getTaskWorkingRecords() {return taskWorkingRecords;}public void setTaskWorkingRecords(List<TaskWorkingRecord> taskWorkingRecords) {this.taskWorkingRecords = taskWorkingRecords;}public List<CountAnswer> getCountAnswers() {return countAnswers;}public void setCountAnswers(List<CountAnswer> countAnswers) {this.countAnswers = countAnswers;}
}源码：
package com.fasterxml.jackson.annotation;import java.io.Serializable;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD, ElementType.FIELD, ElementType.TYPE, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JsonInclude {JsonInclude.Include value() default JsonInclude.Include.ALWAYS;JsonInclude.Include content() default JsonInclude.Include.ALWAYS;Class<?> valueFilter() default Void.class;Class<?> contentFilter() default Void.class;public static class Value implements JacksonAnnotationValue<JsonInclude>, Serializable {private static final long serialVersionUID = 1L;protected static final JsonInclude.Value EMPTY;protected final JsonInclude.Include _valueInclusion;protected final JsonInclude.Include _contentInclusion;protected final Class<?> _valueFilter;protected final Class<?> _contentFilter;public Value(JsonInclude src) {this(src.value(), src.content(), src.valueFilter(), src.contentFilter());}protected Value(JsonInclude.Include vi, JsonInclude.Include ci, Class<?> valueFilter, Class<?> contentFilter) {this._valueInclusion = vi == null ? JsonInclude.Include.USE_DEFAULTS : vi;this._contentInclusion = ci == null ? JsonInclude.Include.USE_DEFAULTS : ci;this._valueFilter = valueFilter == Void.class ? null : valueFilter;this._contentFilter = contentFilter == Void.class ? null : contentFilter;}public static JsonInclude.Value empty() {return EMPTY;}public static JsonInclude.Value merge(JsonInclude.Value base, JsonInclude.Value overrides) {return base == null ? overrides : base.withOverrides(overrides);}public static JsonInclude.Value mergeAll(JsonInclude.Value... values) {JsonInclude.Value result = null;JsonInclude.Value[] arr$ = values;int len$ = values.length;for(int i$ = 0; i$ < len$; ++i$) {JsonInclude.Value curr = arr$[i$];if (curr != null) {result = result == null ? curr : result.withOverrides(curr);}}return result;}protected Object readResolve() {return this._valueInclusion == JsonInclude.Include.USE_DEFAULTS && this._contentInclusion == JsonInclude.Include.USE_DEFAULTS && this._valueFilter == null && this._contentFilter == null ? EMPTY : this;}public JsonInclude.Value withOverrides(JsonInclude.Value overrides) {if (overrides != null && overrides != EMPTY) {JsonInclude.Include vi = overrides._valueInclusion;JsonInclude.Include ci = overrides._contentInclusion;Class<?> vf = overrides._valueFilter;Class<?> cf = overrides._contentFilter;boolean viDiff = vi != this._valueInclusion && vi != JsonInclude.Include.USE_DEFAULTS;boolean ciDiff = ci != this._contentInclusion && ci != JsonInclude.Include.USE_DEFAULTS;boolean filterDiff = vf != this._valueFilter || cf != this._valueFilter;if (viDiff) {return ciDiff ? new JsonInclude.Value(vi, ci, vf, cf) : new JsonInclude.Value(vi, this._contentInclusion, vf, cf);} else if (ciDiff) {return new JsonInclude.Value(this._valueInclusion, ci, vf, cf);} else {return filterDiff ? new JsonInclude.Value(this._valueInclusion, this._contentInclusion, vf, cf) : this;}} else {return this;}}public static JsonInclude.Value construct(JsonInclude.Include valueIncl, JsonInclude.Include contentIncl) {return valueIncl != JsonInclude.Include.USE_DEFAULTS && valueIncl != null || contentIncl != JsonInclude.Include.USE_DEFAULTS && contentIncl != null ? new JsonInclude.Value(valueIncl, contentIncl, (Class)null, (Class)null) : EMPTY;}public static JsonInclude.Value construct(JsonInclude.Include valueIncl, JsonInclude.Include contentIncl, Class<?> valueFilter, Class<?> contentFilter) {if (valueFilter == Void.class) {valueFilter = null;}if (contentFilter == Void.class) {contentFilter = null;}return (valueIncl == JsonInclude.Include.USE_DEFAULTS || valueIncl == null) && (contentIncl == JsonInclude.Include.USE_DEFAULTS || contentIncl == null) && valueFilter == null && contentFilter == null ? EMPTY : new JsonInclude.Value(valueIncl, contentIncl, valueFilter, contentFilter);}public static JsonInclude.Value from(JsonInclude src) {if (src == null) {return EMPTY;} else {JsonInclude.Include vi = src.value();JsonInclude.Include ci = src.content();if (vi == JsonInclude.Include.USE_DEFAULTS && ci == JsonInclude.Include.USE_DEFAULTS) {return EMPTY;} else {Class<?> vf = src.valueFilter();if (vf == Void.class) {vf = null;}Class<?> cf = src.contentFilter();if (cf == Void.class) {cf = null;}return new JsonInclude.Value(vi, ci, vf, cf);}}}public JsonInclude.Value withValueInclusion(JsonInclude.Include incl) {return incl == this._valueInclusion ? this : new JsonInclude.Value(incl, this._contentInclusion, this._valueFilter, this._contentFilter);}public JsonInclude.Value withValueFilter(Class<?> filter) {JsonInclude.Include incl;if (filter != null && filter != Void.class) {incl = JsonInclude.Include.CUSTOM;} else {incl = JsonInclude.Include.USE_DEFAULTS;filter = null;}return construct(incl, this._contentInclusion, filter, this._contentFilter);}public JsonInclude.Value withContentFilter(Class<?> filter) {JsonInclude.Include incl;if (filter != null && filter != Void.class) {incl = JsonInclude.Include.CUSTOM;} else {incl = JsonInclude.Include.USE_DEFAULTS;filter = null;}return construct(this._valueInclusion, incl, this._valueFilter, filter);}public JsonInclude.Value withContentInclusion(JsonInclude.Include incl) {return incl == this._contentInclusion ? this : new JsonInclude.Value(this._valueInclusion, incl, this._valueFilter, this._contentFilter);}public Class<JsonInclude> valueFor() {return JsonInclude.class;}public JsonInclude.Include getValueInclusion() {return this._valueInclusion;}public JsonInclude.Include getContentInclusion() {return this._contentInclusion;}public Class<?> getValueFilter() {return this._valueFilter;}public Class<?> getContentFilter() {return this._contentFilter;}public String toString() {StringBuilder sb = new StringBuilder(80);sb.append("JsonInclude.Value(value=").append(this._valueInclusion).append(",content=").append(this._contentInclusion);if (this._valueFilter != null) {sb.append(",valueFilter=").append(this._valueFilter.getName()).append(".class");}if (this._contentFilter != null) {sb.append(",contentFilter=").append(this._contentFilter.getName()).append(".class");}return sb.append(')').toString();}public int hashCode() {return (this._valueInclusion.hashCode() << 2) + this._contentInclusion.hashCode();}public boolean equals(Object o) {if (o == this) {return true;} else if (o == null) {return false;} else if (o.getClass() != this.getClass()) {return false;} else {JsonInclude.Value other = (JsonInclude.Value)o;return other._valueInclusion == this._valueInclusion && other._contentInclusion == this._contentInclusion && other._valueFilter == this._valueFilter && other._contentFilter == this._contentFilter;}}static {EMPTY = new JsonInclude.Value(JsonInclude.Include.USE_DEFAULTS, JsonInclude.Include.USE_DEFAULTS, (Class)null, (Class)null);}}public static enum Include {ALWAYS,NON_NULL,NON_ABSENT,NON_EMPTY,NON_DEFAULT,CUSTOM,USE_DEFAULTS;private Include() {}}
}