携程apollo分布式配置中心

原理 ：

apollo的部署

jdk 要求8以上

mysql 5.7以上

执行build.sh 这样就把configService,adminService 打包到对应的target下面

把这个放到linux下面执行解压出来 执行scripts 目录下面的start.sh

config里面是配置信息连接数据库的配置信息

protal项目里面要配置连接数据库的配置

这个文件是连接数据库的配置信息

客户端连接配置中心

<dependency>
            <groupId>com.ctrip.framework.apollo</groupId>
            <artifactId>apollo-client</artifactId>
            <version>1.1.0</version>
        </dependency>

这个jar包已经上传到了中央仓库可以直接用

配置多个namespace

动态改变数据源

package com.liuchao.mayikttest.config;

import com.ctrip.framework.apollo.Config;
import com.ctrip.framework.apollo.model.ConfigChangeEvent;
import com.ctrip.framework.apollo.spring.annotation.ApolloConfig;
import com.ctrip.framework.apollo.spring.annotation.ApolloConfigChangeListener;
import com.zaxxer.hikari.HikariDataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

import javax.sql.DataSource;
import java.util.Collections;
import java.util.Set;

@Configuration
@EnableConfigurationProperties(DataSourceProperties.class)
public class DataSourceConfiguration {

    Logger logger = LoggerFactory.getLogger(getClass());

    private final static String DATASOURCE_TAG = "db";

    @Autowired
    ApplicationContext context;

    @ApolloConfig
    Config config;

    @Bean("dataSource")
    public DynamicDataSource dynamicDataSource() {
        DynamicDataSource source = new DynamicDataSource();
        source.setTargetDataSources(Collections.singletonMap(DATASOURCE_TAG, dataSource()));
        return source;
    }
    @ApolloConfigChangeListener
    public void onChange(ConfigChangeEvent changeEvent) {
        Set<String> strings = changeEvent.changedKeys();
        if (strings.contains("spring.datasource.primary.jdbc-url") ||
                strings.contains("spring.datasource.primary.username") ||
            strings.contains("spring.datasource.primary.password")) {
            DynamicDataSource source = context.getBean(DynamicDataSource.class);
            source.setTargetDataSources(Collections.singletonMap(DATASOURCE_TAG, dataSource()));
            source.afterPropertiesSet();
            logger.info("动态切换数据源为：{}", config.getProperty("spring.datasource.url", ""));
        }
    }
    public DataSource dataSource() {
        HikariDataSource dataSource = new HikariDataSource();
        dataSource.setJdbcUrl(config.getProperty("spring.datasource.primary.jdbc-url", ""));
        dataSource.setUsername(config.getProperty("spring.datasource.primary.username", ""));
        dataSource.setPassword(config.getProperty("spring.datasource.primary.password", ""));
        return dataSource;
    }
    class DynamicDataSource extends AbstractRoutingDataSource {
        @Override
        protected Object determineCurrentLookupKey() { return DATASOURCE_TAG; }
    }
}

修改部门信息