【Apollo配置中心】集成springboot自动监听属性变更和动态发布配置

1. 背景

在实际项目中，Spring Boot项目结合使用Apollo配置中心时，经常会遇到需要更新Apollo上的项目的一些配置，比如测试环境或生产环境中，需要修改某个类的属性值，如果我们在Apollo上更新了配置，已经在运行的Spring Boot项目里默认是不生效的。为了避免重启项目才能生效，需要对Apollo配置更新进行监听，并进行一些处理，达到配置动态更新并生效。
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2. 代码

maven依赖引入

	  <!-- Apollo配置中心 -->
	  <dependency>
		  <groupId>com.ctrip.framework.apollo</groupId>
		  <artifactId>apollo-client</artifactId>
		  <version>1.4.0</version>
	  </dependency>
	  <!-- 监听apollo配置, 实时刷新 -->
	  <dependency>
		  <groupId>org.springframework.cloud</groupId>
		  <artifactId>spring-cloud-context</artifactId>
		  <version>3.1.7</version>
	  </dependency>

监听类实现

package com.zsx.listener;

import com.ctrip.framework.apollo.model.ConfigChangeEvent;
import com.ctrip.framework.apollo.spring.annotation.ApolloConfigChangeListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Configuration;

/**
 *
 * @description: 监听apollo配置, 实时刷新
 * @author: zsx
 * @date: 2024/6/12 10:56
 */
@Configuration
public class ApolloConfigListener implements ApplicationContextAware {

    /**
     * 日志
     */
    private static final Logger LOGGER = LoggerFactory.getLogger(ApolloConfigListener.class);

    private ApplicationContext applicationContext;

    /**
     * 配置监听
     * ApolloConfigChangeListener > value 属性默认 命名空间 "application"
     *
     * 示例： @ApolloConfigChangeListener(value = {"application", "test_space"})
     */
    @ApolloConfigChangeListener(value = {"application", "application-comm", "application-dao", "common-redis"})
    private void onChange(ConfigChangeEvent changeEvent) {
        for (String key : changeEvent.changedKeys()) {
            LOGGER.info("apollo key = {} refresh", key);
        }
        // 更新相应的bean的属性值，主要是存在@ConfigurationProperties注解的bean
        this.applicationContext.publishEvent(new EnvironmentChangeEvent(changeEvent.changedKeys()));
    }

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