spring boot启动时加载外部配置文件的方法

@SpringBootApplicationpublic class Application { public static void main(String[] args) throws Exception {  SpringApplicationBuilder springApplicationBuilder = new SpringApplicationBuilder(Application.class);  springApplicationBuilder.web(true);  Properties properties = getProperties();  StandardEnvironment environment = new StandardEnvironment();  environment.getPropertySources().addLast(new PropertiesPropertySource("micro-service", properties));  springApplicationBuilder.environment(environment);  springApplicationBuilder.run(args); } private static Properties getProperties() throws IOException {  PropertiesFactoryBean propertiesFactoryBean = new PropertiesFactoryBean();  ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();  propertiesFactoryBean.setIgnoreResourceNotFound(true);  Resource fileSystemResource = resolver.getResource("file:/opt/company/test.properties");  propertiesFactoryBean.setLocations(fileSystemResource);  propertiesFactoryBean.afterPropertiesSet();  return propertiesFactoryBean.getObject(); }}

@Componentpublic class EnvironmentUtil { private static Environment environment; @Autowired public void setEnvironment(Environment environment) {  EnvironmentUtil.environment = environment; } public static <T> T getProperty(String key, Class<T> targetType, T defaultValue) {  return environment.getProperty(key, targetType, defaultValue); } public static <T> T getProperty(String key, Class<T> targetType) {  return environment.getProperty(key, targetType); } public static String getProperty(String key) {  return environment.getProperty(key); } public static String getProperty(String key, String defaultValue) {  return environment.getProperty(key, defaultValue); } public static Integer getInteger(String key, Integer defaultValue) {  return environment.getProperty(key, Integer.class, defaultValue); }}