<dependency>
     <groupId>com.baomidou</groupId>
     <artifactId>mybatis-plus-boot-starter</artifactId>
     <version>3.5.1</version>
 </dependency>

@Data
public class Test implements Serializable {
    private static final long serialVersionUID = 337361630075002456L;

    @TableId(type= IdType.ASSIGN_ID)
    private long id;

    private String name;

    private String gender;
    
    private String phone;
	
    @TableField(value = "create_date",fill = FieldFill.INSERT)
    private LocalDateTime createDate;

    @TableField(value = "update_date",fill = FieldFill.UPDATE)
    private LocalDateTime updateDate;

}

@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        log.info("start insert fill ....");
        this.strictInsertFill(metaObject, "createDate", LocalDateTime.class, LocalDateTime.now());
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        log.info("start update fill ....");
        this.strictUpdateFill(metaObject, "updateDate", LocalDateTime.class, LocalDateTime.now());
    }
}

@RestController
@RequestMapping("/test")
@Slf4j
@RequiredArgsConstructor
public class TestController {

    @NonNull
    private TestMapper testMapper;

    @GetMapping("/insert")
    public Result insert(@RequestBody Test test){
        testMapper.insert(test);
        return Result.success("插入成功");
    }

    @PutMapping("/update")
    public Result update(@RequestBody Test test){
        testMapper.updateById(test);
        return Result.success("插入成功");
    }
}

{ 
    "name":"王",
    "gender":"男",
    "phone":"123"
}

{ 
	"id":14,
    "name":"王",
    "gender":"男",
    "phone":"123"
}
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