SpringFramework应用接入Apollo配置中心过程解析

环境：

SpringFramework：4.3.5.RELEASE

apollo-client：1.5.1

1.在项目的 resources/META-INF/ 目录下添加 app.properties 文件：

#Apollo配置id
app.id = phpdragon-demo
apollo.bootstrap.enabled = true
apollo.eagerLoad.enabled = true
apollo.cacheDir = /data/app_data/apollo_cache/

2. 新建 ApolloConfigurer 类，负责处理合并本地properties配置：

import com.alibaba.dubbo.common.utils.ConfigUtils;
import com.ctrip.framework.apollo.Config;
import com.ctrip.framework.apollo.ConfigService;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

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

/**
 * 处理apollo配置
 */
public class ApolloConfigurer extends PropertyPlaceholderConfigurer {

  static final String[] NAMESPACES = {"PUBLIC", "REDIS", "ZOOKEEPER", "application"};

  @Override
  protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props) throws BeansException {
    try {
      this.reloadProperties(props);
    } catch (Exception e) {
      e.printStackTrace();
      logger.info("获取apollo配置失败");
    }

    //设置到dubbo的上下里
    ConfigUtils.addProperties(props);

    super.processProperties(beanFactoryToProcess, props);
  }

  private void reloadProperties(Properties props) {
    for (String namespace : NAMESPACES) {
      Config config = ConfigService.getConfig(namespace);
      Set<String> fieldNames = config.getPropertyNames();
      for (String attributeName : fieldNames) {
        props.put(attributeName, config.getProperty(attributeName, ""));
        //设置到系统变量里
        System.setProperty(attributeName, config.getProperty(attributeName, ""));
      }
    }
  }
  @Override
  protected String resolvePlaceholder(String placeholder, Properties props) {
    this.reloadProperties(props);
    return props.getProperty(placeholder);
  }
}

3.在 Spring 的配置xml文件中声明配置：

<bean class="com.phpdragon.config.ApolloConfigurer">
  <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
  <property name="ignoreResourceNotFound" value="true"/>
  <property name="trimValues" value="true"/>
  <property name="locations">
    <list>
      <value>classpath*:*.properties</value>
      <value>classpath*:properties/*.properties</value>
    </list>
  </property>
  <property name="fileEncoding" value="UTF-8"/>
</bean>

4.编写配置类接收远程配置变量：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import redis.clients.jedis.JedisPoolConfig;

import lombok.Data;

/**
 *
 */
@Data
@Configuration
//@EnableApolloConfig不能使用该注解，否则会导致无效，该注解由 ApolloConfigurer 接管类似功能
public class RedisConfig {

  @Value("${sys.redis.host}")
  private String hostName;

  @Value("${sys.redis.port}")
  private int port;

  @Value("${redis.password}")
  private String password;

  @Value("${redis.timeout}")
  private int timeout;

  @Value("${redis.pool.maxTotal}")
  private int maxTotal;

  @Value("${redis.pool.minIdle}")
  private int minIdle;

  @Value("${redis.pool.maxIdle}")
  private int maxIdle;

  @Value("${redis.pool.maxWaitMillis}")
  private long maxWaitMillis;

  @Value("${redis.pool.testOnBorrow}")
  private boolean testOnBorrow;

  @Value("${redis.pool.testOnReturn}")
  private boolean testOnReturn;

}

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