spring boot environment加载过程分析

 environment是在printBanner之前就初始化好了, 更在context创建之前, 

已经加载application-xxxx.properties, System.properties, System.environment ...

也可以自己监听应用启动 SpringApplicationRunListener事件， 完成自己的独特的配置加载方案

启动后调用listener.finished() 打印一些启动后的信息

prepareEnvironment()源码如下

 1     private ConfigurableEnvironment prepareEnvironment(
 2             SpringApplicationRunListeners listeners,
 3             ApplicationArguments applicationArguments) {
 4         // Create and configure the environment
 5         ConfigurableEnvironment environment = getOrCreateEnvironment();
 6 
 7 //加载标准目录下的配置文件 &profile
 8         configureEnvironment(environment, applicationArguments.getSourceArgs());
 9 //加载自定义的配置方案
10         listeners.environmentPrepared(environment);
11         if (!this.webEnvironment) {
12             environment = new EnvironmentConverter(getClassLoader())
13                     .convertToStandardEnvironmentIfNecessary(environment);
14         }
15         return environment;
16     }