springboot配置阿里云日志服务与log4j2 lookup

• 阿里云日志服务
• 配置application.yml
• 配置log4j2.xml
• 配置springboot启动程序

文档：https://help.aliyun.com/product/28958.html

材料准备：project、logstore、accessKeyId、accessKeySecret、endpoint

将准备好的accessKeyId、accessKeySecret配置到application.yml

代码示例：

1.创建事件监听类

public class LoggingListener implements ApplicationListener, Ordered {

    @Override
    public int getOrder() {
        return LoggingApplicationListener.DEFAULT_ORDER - 1;
    }

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ApplicationEnvironmentPreparedEvent) {
            ConfigurableEnvironment environment = ((ApplicationEnvironmentPreparedEvent) event)
                .getEnvironment();

            String accessKeyId = Optional.ofNullable(environment.getProperty("aliyun.log.accessKeyId"))
                               .orElse("");
            String accessKeySecret = Optional.ofNullable(environment.getProperty("aliyun.log.accessKeySecret"))
                                         .orElse("");
            System.setProperty("aliyun.log.accessKeyId", accessKeyId);
            System.setProperty("aliyun.log.accessKeySecret", accessKeySecret);
        }
    }
}

2. 添加到SpringApplication

    public static void main(String[] args) {
        SpringApplication application = new SpringApplication(MyApplication.class);
        application.addListeners(new LoggingListener());
        application.run(args);
    }