private ConfigurableEnvironment prepareEnvironment(

             SpringApplicationRunListeners listeners,

             ApplicationArguments applicationArguments) {

         // Create and configure the environment

         ConfigurableEnvironment environment = getOrCreateEnvironment();

 //加载标准目录下的配置文件 &profile

         configureEnvironment(environment, applicationArguments.getSourceArgs());

 //加载自定义的配置方案

         listeners.environmentPrepared(environment);

         if (!this.webEnvironment) {

             environment = new EnvironmentConverter(getClassLoader())

                     .convertToStandardEnvironmentIfNecessary(environment);

         }

         return environment;

     }