使用Mybatis-plus实现时间自动填充(代码直接可用)

一. 搭建基础项目

二. 设置自动填充

一. 搭建基础项目

引入依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--lombok 依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- swagger2 依赖 -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!-- Swagger第三方ui依赖 -->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.6</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.1.tmp</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
    </dependencies>

controller

@RestController
public class TestController {
    @Autowired
    private IProjectService projectService;
    @ApiOperation("新增项目")
    @PostMapping("/")
    public void addProjectWrite(@RequestBody Project project) {
        projectService.save(project);
    }
}

service

public interface IProjectService extends IService<Project> {
}

serviceImpl

@Service
public class ProjectServiceImpl extends ServiceImpl<ProjectMapper, Project> implements IProjectService {
}

Mapper

@Service
public class ProjectServiceImpl extends ServiceImpl<ProjectMapper, Project> implements IProjectService {
}

Pojo

@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("ts_project")
@ApiModel(value="Project对象", description="撰写项目申请书的基本内容")
public class Project implements Serializable {
    private static final long serialVersionUID = 1L;
    @TableId(value = "id", type = IdType.AUTO)
    private String id;
    private Integer workNumber;
    private Integer adminId;
    private String name;
    @ApiModelProperty(value = "创建时间")
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone = "Asia/Shanghai")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date gmtCreate;
    @ApiModelProperty(value = "更新时间")
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone = "Asia/Shanghai")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date gmtModified;
}

application.yml

server:
  # 端口
  port: 8081
spring:
  # 数据源配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: root
# Mybatis-plus配置
mybatis-plus:
  #配置Mapper映射文件
  mapper-locations: classpath*:/mapper/*Mapper.xml
  # 配置MyBatis数据返回类型别名（默认别名是类名）
  type-aliases-package: com.xxxx.server.pojo
  configuration:
    # 自动驼峰命名
    map-underscore-to-camel-case: fals

启动类

@SpringBootApplication
@EnableScheduling
@MapperScan("com.xxxx.server.mapper")
public class TestApplication {
    public static void main(String[] args) {
        SpringApplication.run(TestApplication.class,args);
    }
}

搭建完成

此时执行操作，并不会在表中添加时间，如下：

二. 设置自动填充

创建MyMetaObjectHandler文件，实现自动填充

/**
 * 自动填充时间
 */
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("gmtCreate",  new Date(), metaObject);
        this.setFieldValByName("gmtModified", new Date(), metaObject);
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("gmtModified", new Date(), metaObject);
    }
}

修改pojo类

@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("ts_project")
@ApiModel(value="Project对象", description="撰写项目申请书的基本内容")
public class Project implements Serializable {
    private static final long serialVersionUID = 1L;
    @TableId(value = "id", type = IdType.AUTO)
    private String id;
    private Integer workNumber;
    private Integer adminId;
    private String name;
    @ApiModelProperty(value = "创建时间")
    @TableField(fill = FieldFill.INSERT)
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone = "Asia/Shanghai")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date gmtCreate;
    @ApiModelProperty(value = "更新时间")
    @TableField(fill = FieldFill.INSERT_UPDATE)
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone = "Asia/Shanghai")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date gmtModified;
}

在gmtCreate上增加 @TableField(fill = FieldFill.INSERT) 表示创建时间。

在gmtModified上增加 @TableField(fill = FieldFill.INSERT_UPDATE)表示修改时间。

gmtCreate和gmtModified需要与自定义方法中的字段相匹配。

此时执行操作，会在表中添加时间，如下：