2018-12-18 springboot返回属性的值为null

@Configuration

public class JsonConfig {

    @Bean

    @Primary

    @ConditionalOnMissingBean(ObjectMapper.class)

    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {

        ObjectMapper objectMapper = builder.createXmlMapper(false).build();

        objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {

            @Override

            public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {

                jsonGenerator.writeString("");//""空字符串或其他字符

            }

        });

        return objectMapper;

    }

}