问题：

后端操作后返回时间格式是"2024-04-28T14:48:41"

而我们想要的是："2024-04-28 14:48:41",

两个解决方法：

方法一：使用 @JsonFormat注解

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;

    private String username;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss" )
    private LocalDateTime createTime;

    @JsonFormat(pattern =  "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime updateTime;
}

方法二：使用ObjectMapper

@Configuration
public class WebConfig {
    @Bean
    public ObjectMapper initObjectMapper(){
        ObjectMapper objectMapper = new ObjectMapper();
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(formatter));
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(formatter));
        objectMapper.registerModule(javaTimeModule);
        return objectMapper;
    }
}

这样属性就不用添加注解啦【强力推荐d=====(￣▽￣*)b】