时间：2020-10-27 12:07:49 | 栏目：JAVA代码 | 点击：次
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：
@SpringBootApplication
public 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
@Component
public 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