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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