No.4 Spring boot 中如何在Utils類中使用@Autowired注入bean
阿新 • • 發佈:2018-12-26
Springboot中如果希望在Utils工具類中,使用到我們已經定義過的Dao層或者Service層Bean,可以如下編寫Utils類:
1. 使用@Component註解標記工具類StatisticsUtils:
2. 使用@Autowired(@Autowired和@Resource的區別不再介紹)注入我們需要的bean:
3. 在工具類中編寫init()函式,並使用@PostConstruct註解標記工具類,初始化Bean:
4. 然後我們在StatustucsUtils.getIdeaParticipateNum函式中,就可以使用到我們注入的ideaMemberDao了public class StatisticsUtils { @Autowired private IdeaMemberDao ideaMemberDao; @Autowired private ProjectMemberDao projectMemberDao; @Autowired private IdeaMgrDao ideaMgrDao; @Autowired private ProjectMgrDao projectMgrDao; public static StatisticsUtils statisticsUtils; @PostConstruct public void init() { statisticsUtils = this; statisticsUtils.ideaMemberDao = this.ideaMemberDao; statisticsUtils.projectMemberDao = this.projectMemberDao; statisticsUtils.ideaMgrDao = this.ideaMgrDao; statisticsUtils.projectMgrDao = this.projectMgrDao; } }
public static Integer getIdeaParticipateNum(){
return statisticsUtils.ideaMemberDao.NumOfIdea();
}