Spring Boot 项目启动时按需初始化加载数据

1、新建类,类上添加注解 @Component ,该类用于在项目启动时处理数据加载任务;

2、该类实现 ApplicationRunner 接口,并重写 run 方法;

3、在重写的 run 方法里处理数据加载任务;

注意:

有定时加载数据需求的话,添加定时任务即可;

一次性加载大数据量时可能内存溢出;

同一个项目中,可以定义多个 ApplicationRunner 的实现类;

存在多个 ApplicationRunner 的实现类时,可通过 @Order 注解来确定执行顺序,数值越小(值可为负数),越先执行;

java 复制代码
@Component
public class InitDataService implements ApplicationRunner {

    private final PeopleInfoMapper peopleInfoMapper;

    @Autowired
    public InitDataService(PeopleInfoMapper peopleInfoMapper) {
        this.peopleInfoMapper = peopleInfoMapper;
    }

    public static List<String> nameList = Collections.synchronizedList(new ArrayList<>());

    @Override
    public void run(ApplicationArguments args) throws Exception {
        nameList = peopleInfoMapper.getAllData();
        System.err.println(" InitDataService " + nameList.size());
    }

}