apollo配置如何实现热更新

1 简单对象apollo配置热更新
对于简单对象（如String、Integer、Boolean等），只需要在配置类上增加@RefreshScope注解便可以实现配置热更新，如下代码：

import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.context.annotation.Configuration;

/**
 * TestConfig  配置
 *
 * @author gongmin
 * @date 2023/9/25 12:00
 */
@Configuration
@RefreshScope
@Getter
@Setter
public class TestConfig {
    @Value("${test.app-id}")
    private String appId;

    @Value("${test.secret}")
    private String secret;
}

2 复杂对象apollo配置热更新
@Value注解无法对复杂对象（如List<Object>, Object, Map<String, Object>等）生效，我们需要监听apollo配置变化，编码实现热更新
2.1 配置内容如下：

test-config:
  list:
    - name: gongmin
      address: 长沙
      phone: 123456789
    - name: xiaoli
      address: 北京
      phone: 987654321
  map:
    "gongmin": {"name": "gongmin", "address": "长沙", "phone": "123456789"}
    "xiaoli": {"name": "xiaoli", "address": "北京", "phone": "987654321"}
  obj:
    name: gongmin
    address: 长沙
    phone: 123456789

2.2 配置类如下：

import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.context.annotation.Configuration;

import java.util.*;

/**
 * TestConfig
 *
 * @author gongmin
 * @date 2023/9/25 14:43
 */
@Configuration
@Getter
@Setter
@ConfigurationProperties(prefix = "test-config")
@RefreshScope
public class TestConfig {
    private List<UserInfo> list = Collections.emptyList();
    private Map<String, UserInfo> map = new HashMap<>(0);
    private UserInfo obj = new UserInfo();

    @Getter
    @Setter
    public static class UserInfo {
        private String name;
        private String address;
        private String phone;
    }
}

2.3 监听apollo配置变化

import com.ctrip.framework.apollo.model.ConfigChange;
import com.ctrip.framework.apollo.model.ConfigChangeEvent;
import com.ctrip.framework.apollo.spring.annotation.ApolloConfigChangeListener;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.context.scope.refresh.RefreshScope;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

/**
 * apollo配置动态刷新
 *
 * @author gongmin
 * @date 2023/9/25 13:44
 */
@Slf4j
@Component
public class ApolloRefreshListener {
    @Resource
    private RefreshScope refreshScope;

    /**
     * 监听配置文件变化并刷新内存配置
     */
    @ApolloConfigChangeListener(value = {"application.yml", "application.properties"})
    private void cacheRefresh(ConfigChangeEvent changeEvent) {
        log.info("<cacheRefresh> {} 配置文件发生变化", changeEvent.getNamespace());

        refreshScope.refresh("testConfig");
    }
}

3 注意：不管是简单对象还是复杂对象的配置热更新，都需要在配置类上加@RefreshScope注解