详解spring boot容器加载完后执行特定操作

有时候我们需要在spring boot容器启动并加载完后，开一些线程或者一些程序来干某些事情。这时候我们需要配置ContextRefreshedEvent事件来实现我们要做的事情

1、ApplicationStartup类

public class ApplicationStartup implements ApplicationListener<ContextRefreshedEvent>{
  public void onApplicationEvent(ContextRefreshedEvent event)
   {
    //在容器加载完毕后获取dao层来操作数据库
    OSSVideoRepository ossVideoRepository = (OSSVideoRepository)event.getApplicationContext().getBean(OSSVideoRepository.class);
    //在容器加载完毕后获取配置文件中的配置
    ServerConfig serverConfig = (ServerConfig)event.getApplicationContext().getBean(ServerConfig.class);

    ServerFileScanner fileScanner = new ServerFileScanner(
        ossVideoRepository, serverConfig.getScanpath());
    //在容器加载完毕后启动线程
    Thread thread = new Thread(fileScanner);
    thread.start();
   }
}

2、ServerConfig 类

@Component
@ConfigurationProperties(prefix = "server")
public class ServerConfig {
  private String aliyunossEndpoint;
  private String aliyunossAccessKeyId;
  private String aliyunossAccessKeySecret;
  private String aliyunossBucketName;
  private String scanpath;

  public String getAliyunossEndpoint() {
    return aliyunossEndpoint;
  }

  public void setAliyunossEndpoint(String aliyunossEndpoint) {
    this.aliyunossEndpoint = aliyunossEndpoint;
  }

  public String getAliyunossAccessKeyId() {
    return aliyunossAccessKeyId;
  }

  public void setAliyunossAccessKeyId(String aliyunossAccessKeyId) {
    this.aliyunossAccessKeyId = aliyunossAccessKeyId;
  }

  public String getAliyunossAccessKeySecret() {
    return aliyunossAccessKeySecret;
  }

  public void setAliyunossAccessKeySecret(String aliyunossAccessKeySecret) {
    this.aliyunossAccessKeySecret = aliyunossAccessKeySecret;
  }

  public String getAliyunossBucketName() {
    return aliyunossBucketName;
  }

  public void setAliyunossBucketName(String aliyunossBucketName) {
    this.aliyunossBucketName = aliyunossBucketName;
  }

  public String getScanpath() {
    return scanpath;
  }

  public void setScanpath(String scanpath) {
    this.scanpath = scanpath;
  }

}

PS：还有一些spring内置的事件

1、 ContextRefreshedEvent：ApplicationContext容器初始化或者刷新时触发该事件。
2、 ContextStartedEvent：当使用ConfigurableApplicationContext接口的start()方法启动ApplicationContext容器时触发该事件。
3、 ContextClosedEvent：当使用ConfigurableApplicationContext接口的close()方法关闭ApplicationContext容器时触发该事件。
4、 ContextStopedEvent: 当使用ConfigurableApplicationContext接口的stop()方法停止ApplicationContext容器时触发该事件。

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