SpringBoot允许简单配置它在application.properties文件中使用的jackson objectmapper。
文档中描述了支持的属性(https://docs.spring.io/spring-boot/docs/current/reference/html/howto.html#howto-自定义对象Map器（objectmapper）
明确地 spring.jackson.default-property-inclusion=non_null 在application.properties中应该做到这一点。
如果要对特定的类或属性执行此操作，jackson有注解 @JsonInclude(Include.NON_NULL) .

如果您正在使用jackson序列化json，那么应该查看 setSerializationInclusion() 上的方法 ObjectMapper https://fasterxml.github.io/jackson-databind/javadoc/2.7/com/fasterxml/jackson/databind/objectmapper.html#setserializationinclusion（com.fasterxml.jackson.annotation.jsoninclude.include）
下面是一个简单的测试用例，它可以防止 sms json输出中包含的字段：

@Test
public void testJson() throws Exception {
    Addr addr = new Addr();
    addr.phoneNumber = "";
    Destination destination = new Destination();
    destination.messageId = "";
    destination.to = addr;
    Scenario scenario = new Scenario();
    scenario.scenarioKey = "";
    scenario.bulkId = "";
    scenario.destinations = Arrays.asList(destination);
    ObjectMapper mapper = new ObjectMapper()
            .enable(SerializationConfig.Feature.INDENT_OUTPUT)
            .setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
    System.out.println(mapper.writeValueAsString(scenario));
}
public static class Scenario {
    public String scenarioKey;
    public String bulkId;
    public List<Destination> destinations;
    public String sms;
}
public static class Destination {
    public String messageId;
    public Addr to;
}
public static class Addr {
    public String phoneNumber;
}