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
@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());
}
}