Spring Cloud Config配置中心可以使用git，svn以及数据库方式实现配置存储等等，分别在配置文件中对应spring.profiles.active定义入口实现EnvironmentRepository接口。

比方说spring.cloud.config.server=jdbc的时候，通过JdbcEnvironmentRepository实现接口，spring.cloud.config.server=svn，通过SvnKitEnvironmentRepository实现接口。具体可以参考这两个实现。

JdbcEnvironmentRepository部分代码

/** * Subversion-backed {@link EnvironmentRepository}. * * @author Michael Prankl * @author Roy Clarkson */@ConfigurationProperties("spring.cloud.config.server.svn")public class SvnKitEnvironmentRepository extends AbstractScmEnvironmentRepository		implements EnvironmentRepository, InitializingBean {	private static Log logger = LogFactory.getLog(SvnKitEnvironmentRepository.class);	private static final String DEFAULT_LABEL = "trunk";

SvnKitEnvironmentRepository部分代码

/** * An {@link EnvironmentRepository} that picks up data from a relational database. The * database should have a table called "PROPERTIES" with columns "APPLICATION", "PROFILE", * "LABEL" (with the usual {@link Environment} meaning), plus "KEY" and "VALUE" for the * key and value pairs in {@link Properties} style. Property values behave in the same way * as they would if they came from Spring Boot properties files named * {application}-{profile}.properties, including all the encryption and * decryption, which will be applied as post-processing steps (i.e. not in this repository * directly). *  * @author Dave Syer * */@ConfigurationProperties("spring.cloud.config.server.jdbc")public class JdbcEnvironmentRepository implements EnvironmentRepository, Ordered {	private static final String DEFAULT_SQL = "SELECT KEY, VALUE from PROPERTIES where APPLICATION=? and PROFILE=? and LABEL=?";	private int order = Ordered.LOWEST_PRECEDENCE - 10;	private final JdbcTemplate jdbc;	private String sql = DEFAULT_SQL;	private final PropertiesResultSetExtractor extractor = new PropertiesResultSetExtractor();

从上面可以清楚看到，如何实现自定义的实现类了

比如除了前文提及到框架实现的jdbc方式，我想通过mybatis-jdbc实现存储提取方式（甚至通过Redis缓存等）。自定义spring.profiles.active=mybatis。

application.yml

server:  port: 8041spring:  application:    name: config-server-mysql    # 项目名称尽量用小写  profiles:     active: mybatis###################################################################################################### mysql 属性配置  datasource:    driver-class-name: com.mysql.jdbc.Driver    url: jdbc:mysql://10.79.158.43:3306/frdm    username: frdm_app    password: frdm_app*1########################################################################################################################################################################################################### mybatis mapper xml 配置mybatis:  # mybatis.type-aliases-package：指定domain类的基包，即指定其在*Mapper.xml文件中可以使用简名来代替全类名  type-aliases-package:  mapper-locations: classpath:mybatis/mapper/*.xml  config-location: classpath:mybatis/mybatis-config.xml

实现类代码，需要实现findone函数，里面具体实现这里只是个参考，可根据情况自行实现。通过application、profile和label三个参数将key和value放到map变量中，再将map放到environment变量中，return environment即可。

@profile作为入口，本文通过mybatis进入，也可以通过其他自定义，例如redis进入

@Configuration@Profile("mybatis")public class ConfigEnvironmentRepository implements EnvironmentRepository {	@Resource	private IConfigService service;		@Override	public Environment findOne(String application, String profile, String label) {		if (StringUtils.isEmpty(application) || StringUtils.isEmpty(profile)) return null;		List
    
      configList = service.find(application, profile, label);		if(configList != null && configList.size()>0){			Environment environment = new Environment(application, 					StringUtils.commaDelimitedListToStringArray(profile),label,"version", "state");			Map map = new HashMap<>();			for(ConfigInfo configInfo:configList){				map.put(configInfo.getKey(), configInfo.getValue());			}			environment.add(new PropertySource(application + "_" + profile + "_" + label, map));			return environment;		}		return new Environment(application,StringUtils.commaDelimitedListToStringArray(profile));	}}
    

代码组织截图如下：