Springboot使用外部yml启动

有时候我们想更灵活的使用配置文件，例如同一套代码去部署多个客户，此时差异大的地方其实只是配置文件，这是我们希望每次启动项目从外部读取配置文件来加载项目，你可以使用一些配置中心来实现，当然也可以自己定义外部文件来实现。

java 复制代码

import com.ctrip.framework.apollo.Config;
import com.ctrip.framework.apollo.ConfigChangeListener;
import com.ctrip.framework.apollo.ConfigService;
import com.ctrip.framework.apollo.model.ConfigChange;
import com.ctrip.framework.apollo.model.ConfigChangeEvent;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.core.io.FileSystemResource;

import java.util.Properties;
import java.util.Set;

@SpringBootApplication
@Slf4j
public class LitchiDaqApplication {
    private static Properties PROPERTIES = new Properties();

    public static void main(String[] args) {
//		SpringApplication.run(LitchiDaqApplication.class, args);
        try {
            String filePath = System.getProperty("user.dir") + "/config" + "/application-daq.yml";
            //此处获取启动参数中的config.id来判断从哪里读取config文件
            String configId = System.getProperty("config.id");
            if (configId != null) {
                //从Apollo配置中心获取配置
                Config config = ConfigService.getAppConfig();
                //监听apollo配置修改
                config.addChangeListener(new ConfigChangeListener() {
                    @Override
                    public void onChange(ConfigChangeEvent changeEvent) {
                        log.info("发生改变的工作区: {}", changeEvent.getNamespace());
                        for (String key : changeEvent.changedKeys()) {
                            ConfigChange change = changeEvent.getChange(key);
                            log.info(String.format("检测到改变 - key: %s, oldValue: %s, newValue: %s, changeType: %s",
                                    change.getPropertyName(), change.getOldValue(), change.getNewValue(), change.getChangeType()));
                        }
                    }
                });
                Set<String> keys = config.getPropertyNames();
                for (String key : keys) {
                    PROPERTIES.setProperty(key, config.getProperty(key, null));
                }
            } else {
                YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();
                factory.setResources(new FileSystemResource(filePath));
                PROPERTIES = factory.getObject();
            }
        } catch (Exception e) {
            log.error("项目初始化配置错误：", e);
        }
        new SpringApplicationBuilder(LitchiDaqApplication.class).properties(PROPERTIES).run(args);
    }
}

项目模拟外部文件读取