springboot添加propertySource过程

​StandardServletEnvironment​

StandardServletEnvironment 添加2个 添加servletConfigInitParams 添加servletContextInitParams



protected void customizePropertySources(MutablePropertySources propertySources) {
    propertySources.addLast(new StubPropertySource(SERVLET_CONFIG_PROPERTY_SOURCE_NAME)); //添加servletConfigInitParams propertysource
    propertySources.addLast(new StubPropertySource(SERVLET_CONTEXT_PROPERTY_SOURCE_NAME)); //添加servletContextInitParams  propertysource
    if (JndiLocatorDelegate.isDefaultJndiEnvironmentAvailable()) {
      propertySources.addLast(new JndiPropertySource(JNDI_PROPERTY_SOURCE_NAME)); //jndiProperties
    }
    super.customizePropertySources(propertySources); // 添加systemEnvironment systemProperties
  }

​StandardEnvironment​

# 添加 systemProperties systemEnvironment
protected void customizePropertySources(MutablePropertySources propertySources) {
    propertySources.addLast( //系统参数 (比如vm options)
        new PropertiesPropertySource(SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME, getSystemProperties())); // addLast systemProperties
    propertySources.addLast( // 环境变量
        new SystemEnvironmentPropertySource(SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME, getSystemEnvironment())); // addLast systemEnvironment
  }

​SpringApplication ​

​不一定有，启动的时候加了命令行参数​

​这里是addFirst，添加到第一个位置​

protected void configurePropertySources(ConfigurableEnvironment environment, String[] args) {
    MutablePropertySources sources = environment.getPropertySources();
    if (this.defaultProperties != null && !this.defaultProperties.isEmpty()) {
      sources.addLast(new MapPropertySource("defaultProperties", this.defaultProperties));
    }
    if (this.addCommandLineProperties && args.length > 0) { // 有命令行参数 比如--server.port=11003
      String name = CommandLinePropertySource.COMMAND_LINE_PROPERTY_SOURCE_NAME;
      if (sources.contains(name)) { // 判断有没有存在名称=name的PropertySource
        PropertySource<?> source = sources.get(name);
        CompositePropertySource composite = new CompositePropertySource(name);
        composite.addPropertySource(
            new SimpleCommandLinePropertySource("springApplicationCommandLineArgs", args));
        composite.addPropertySource(source);
        sources.replace(name, composite); //替换
      }
      else {
        sources.addFirst(new SimpleCommandLinePropertySource(args));  // 这里添加first
      }
    }
  }

# systemEnvironment

# StandardEnvironment添加 SystemEnvironmentPropertySource
propertySources.addLast( // 环境变量
        new SystemEnvironmentPropertySource(SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME, getSystemEnvironment())); // addLast systemEnvironment

ConfigFileApplicationListener

public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
    addPropertySources(environment, application.getResourceLoader());
  }


protected void addPropertySources(ConfigurableEnvironment environment, ResourceLoader resourceLoader) {
    RandomValuePropertySource.addToEnvironment(environment); // 添加RandomValuePropertySource
    new Loader(environment, resourceLoader).load(); // 默认情况下 这里加载所有application开头的资源文件
  }

// 添加RandomValuePropertySource 添加到systemEnvironment后面

​加载所有的application配置文件，每个配置文件1个propertysource ​