SpringFramework 应用接入 Apollo 配置中心

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;

}