前言

相信很多人选择Spring Boot主要是考虑到它既能兼顾Spring的强大功能，还能实现快速开发的便捷。本文主要给大家介绍了关于spring boot启动时加载外部配置文件的相关内容，下面话不多说了，来随着小编一起学习学习吧。

业务需求:

加载外部配置文件，部署时更改比较方便。

先上代码：

@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(); }}

使用变量的工具类

@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); }}

也可以通过@Value("${key}")使用

这中加载方法优先级很高，如果与spring boot配置文件同名，将覆盖application.properties文件中的配置。

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对的支持。