<dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.3.2</version>
    </dependency>

spring.datasource.username=root
spring.datasource.password=19981204
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis_plus?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl//配置默認(rèn)日志

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
  @TableId(type = IdType.AUTO)
  private Long id;
  private String name;
  private Integer age;
  private String email;
  
}

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
  @TableId(type = IdType.AUTO)
  private Long id;
  private String name;
  private Integer age;
  private String email;
  @TableField(fill = FieldFill.INSERT)
  private LocalDateTime createTime;
  @TableField(fill = FieldFill.INSERT_UPDATE)
  private LocalDateTime updateTime;
}

package com.ls.handler;

    import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
    import org.apache.ibatis.reflection.MetaObject;
    import org.springframework.stereotype.Component;

    import java.time.LocalDateTime;

/**
 * @author dell
 */
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
  @Override
  public void insertFill(MetaObject metaObject) {
    this.strictInsertFill(metaObject,"createTime", LocalDateTime.class,LocalDateTime.now());
    this.strictUpdateFill(metaObject,"updateTime",LocalDateTime.class,LocalDateTime.now());

  }

  @Override
  public void updateFill(MetaObject metaObject) {
    this.strictUpdateFill(metaObject,"updateTime",LocalDateTime.class,LocalDateTime.now());
  }
}