SpringBoot jackson返回值中含有null的解决办法

1.遇到的问题：后端查询到的数据中含有null值，会展示到表格中，需求是将null替换为空

2.解决办法：

添加这个配置类就可以

@Configuration
public class JacksonConfig {
    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer