没做处理的时候返回类似："updateTime":"2021-05-06T10:57:27" 这种形况

添加配置：

import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
@Configuration
public class LocalDateTimeSerializerConfig {
    private static final String pattern ="yyyy-MM-dd HH:mm:ss";
    /**
     *  注册响应json格式的LocalDateTime日期格式序列化器,指定格式
     */
    @Bean
    public LocalDateTimeSerializer localDateTimeSerializer() {
        return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern));
    }
    /**
     *  注册json请求方式的LocalDateTime反序列化器,指定格式
     */
    @Bean
    public LocalDateTimeDeserializer localDateTimeDeserializer() {
        return new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(pattern));
    }
    /**
     *  格式化日期类型,响应对应格式化日期字符串
     */
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> {
            //返回json格式,前端序列化为字符串
            builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
            //从json对象日期字符串反序列化为日期对象
            builder.deserializerByType(LocalDateTime.class, localDateTimeDeserializer());
        };
    }
}

加入配置后返回："updateTime":"2021-05-06 10:57:27"