如何在 spring 启动时有条件地自动装配?

How to Autowire conditionally in spring boot?

我创建了一个调度器class

public class TestSchedulderNew {

@Scheduled(fixedDelay = 3000)
public void fixedRateJob1() {
System.out.println("Job 1 running");
}

@Scheduled(fixedDelay = 3000)
public void fixedRateJob2() {
System.out.println("Job 2 running");
}
}

在配置中,我添加了@ConditionalOnProperty 注释以在有条件的情况下启用它。

 @Bean
@ConditionalOnProperty(value = "jobs.enabled")
public TestSchedulderNew testSchedulderNew() {
return new TestSchedulderNew();
}

现在在控制器中,我创建了 "stopScheduler" 方法来停止那些调度程序,在这个控制器中我已经自动装配 测试调度新 class

 @RestController
 @RequestMapping("/api")
 public class TestCont {

private static final String SCHEDULED_TASKS = "testSchedulderNew";

 @Autowired
 private ScheduledAnnotationBeanPostProcessor postProcessor;    /]

 @Autowired
 private TestSchedulderNew testSchedulderNew;


 @GetMapping(value = "/stopScheduler")
 public String stopSchedule(){
  postProcessor.postProcessBeforeDestruction(testSchedulderNew, 
   SCHEDULED_TASKS);
  return "OK";
  }
 }     

现在的问题是,如果条件 属性 为假,那么我将低于异常

   Field testSchedulderNew in com.sbill.app.web.rest.TestCont required a bean of type 'com.sbill.app.schedulerJob.TestSchedulderNew

如果为真,一切正常,

我们有什么办法可以解决这个问题吗?

您可以在 stopScheduler 方法中使用 @Autowired(required=false) 和 null 检查。

 @Autowired(required=false)
 private TestSchedulderNew testSchedulderNew;

 @GetMapping(value = "/stopScheduler")
 public String stopSchedule() {
     if (testSchedulderNew != null) {
         postProcessor.postProcessBeforeDestruction(testSchedulderNew, 
          SCHEDULED_TASKS);
         return "OK";
     }
     return "NOT_OK";
 }