1 通知SpringBoot配置文件有变化

ApplicationContext..publishEvent(new EnvironmentChangeEvent(changedKeys));

2 通知gateway刷新路由

ApplicationEventPublisher.publishEvent(new RefreshRoutesEvent(this));

以apollo配置中心为例，SpringCloud gateway实现动态路由代码如下：

package com.sa.config;

import com.ctrip.framework.apollo.model.ConfigChangeEvent;
import com.ctrip.framework.apollo.spring.annotation.ApolloConfigChangeListener;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
import org.springframework.cloud.gateway.event.RefreshRoutesEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.stereotype.Component;

/**
 * apollo动态路由
 *
 * @author gongmin
 * @date 2024/1/23 15:06
 */
@Component
@Slf4j
public class GatewayPropertiesRefresher implements ApplicationContextAware, ApplicationEventPublisherAware {
    private ApplicationContext applicationContext;
    private ApplicationEventPublisher publisher;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        this.publisher = applicationEventPublisher;
    }

    /**
     * 监听apollo配置，实现网关路由动态更新
     *
     * @param changeEvent 更新事件
     */
    @ApolloConfigChangeListener(value = "application.yml", interestedKeyPrefixes = "spring.cloud.gateway.")
    public void onChange(ConfigChangeEvent changeEvent) {
        refreshGatewayProperties(changeEvent);
    }

    /**
     * 刷新路由
     *
     * @param changeEvent 更新事件
     */
    private void refreshGatewayProperties(ConfigChangeEvent changeEvent) {
        log.debug("<refreshGatewayProperties> start");
        this.applicationContext.publishEvent(new EnvironmentChangeEvent(changeEvent.changedKeys()));
        refreshGatewayRouteDefinition();
        log.debug("<refreshGatewayProperties> end");
    }

    /**
     * 刷新路由
     */
    private void refreshGatewayRouteDefinition() {
        log.debug("<refreshGatewayRouteDefinition> start");
        this.publisher.publishEvent(new RefreshRoutesEvent(this));
    }
}