项目中Service经常使用lombok提供的注解@RequiredArgsConstructor或者@AllArgsConstructor来注入其他Service
注解 @RequiredArgsConstructor生成带有必需参数的构造函数。 必需的参数是最终字段和具有约束的字段，例如@NonNull 。@AllArgsConstructor则是全部
但是使用的时候可能会存在循环依赖的问题
┌─────┐ | sysUserV2ServiceImpl defined in URL [jar:file:/home/starwiz/data/hyt/starwiz.jar!/BOOT-INF/classes!/com/starwiz/project/system/v2/service/impl/SysUserV2ServiceImpl.class] ↑ ↓ | processServiceImpl (field com.starwiz.project.workflow.WorkflowUtil com.starwiz.project.workflow.service.impl.ProcessServiceImpl.workflowUtil) ↑ ↓ | workflowUtil (field com.starwiz.project.system.service.SysTodoService com.starwiz.project.workflow.WorkflowUtil.sysTodoService) ↑ ↓ | sysTodoService (field private com.starwiz.project.warning.service.EarlyWarningFarmerService com.starwiz.project.system.service.impl.SysTodoServiceImpl.earlyWarningFarmerService) ↑ ↓ | earlyWarningFarmerService (field com.starwiz.project.workflow.service.WorkflowService com.starwiz.project.warning.service.impl.EarlyWarningFarmerServiceImpl.workflowService) ↑ ↓ | workflowServiceImpl (field com.starwiz.project.system.v2.service.SysUserV2Service com.starwiz.project.workflow.service.impl.WorkflowServiceImpl.sysUserV2Service) └─────┘
- 方法1
@Autowired @Lazy //懒加载
- 方法2
// lombok的注解 @AllArgsConstructor
- 方法3 使用 setter/field 方法注入
private DepartmentService departmentSerivce; @Autowired public void setDepartmentSerivce(DepartmentService departmentService) { this.departmentService = departmentService; }
- 方法4 使用 @PostConstruct
@Service public class UserService { @Autowired private DepartmentService departmentService; @PostConstruct public void init() { departmentService.setUserService(this); } public DepartmentService getDepartmentService() { return departmentService; } }
- 方法5 实现ApplicationContextAware and InitializingBean接口
@Service public class UserService implements ApplicationContextAware, InitializingBean { private DepartmentService departmentService; private ApplicationContext context; public DepartmentService getDepartmentService() { return departmentService; } @Override public void afterPropertiesSet() throws Exception { circB = context.getBean(DepartmentService.class); } @Override public void setApplicationContext(final ApplicationContext ctx) throws BeansException { context = ctx; } }
- 使用Mybatis Plus時，可以将依赖 Service 换成依赖
Mapper，因为 Mapper 中也有这些基础方法
