SpringBoot加载外部配置文件的几种方式

一

@PropertySource("file:F:/my.properties")
@Configuration
@ConfigurationProperties(prefix = "my")
public class TestConfig {

    private String url;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }
}

二

与第一种方法不同的是, 前者是加载了application.yml/bootstrap.yml之后再加载的, 而此种方法是在加载配置文件之前进行属性源PropertySource配置

public class BootstrapFileApplicationListener
        implements ApplicationListener<ApplicationEnvironmentPreparedEvent>, Ordered {

    @Override
    public int getorder() {
        //需要在ConfigFileApplicationListener之前加载
        return Ordered.HIGHEST_PRECEDENCE + 9;
    }

    @Override
    public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
        MutablePropertySources propertySources = event.getEnvironment().getPropertySources();
        Map<String, Object> source = new HashMap<>(1);
        //文件名称
        source.put(ConfigFileApplicationListener.CONfig_NAME_PROPERTY, "test");
        //路径
        source.put(ConfigFileApplicationListener.CONfig_ADDITIONAL_LOCATION_PROPERTY, "F:/system/desktop/");
        propertySources.addLast(new MapPropertySource("custom", source));
    }
}

需要在resources/meta-inf/spring.factories定义

# Application Listeners
org.springframework.context.ApplicationListener=xxx.xxx.BootstrapFileApplicationListener

三

与第二种添加一个属性源的方法类似, SpringBoot会将System.getProperty系统属性当作一种属性源, 同样需要在ConfigFileApplicationListener之前加载

System.setProperty("spring.config.name", "test");
System.setProperty("spring.config.additional-location", "F:/system/desktop/");