1 配置文件

wisely.primary.datasource.driverClassName=oracle.jdbc.OracleDriver
wisely.primary.datasource.url=jdbc\:oracle\:thin\:@192.168.1.103\:1521\:xe
wisely.primary.datasource.username=gis
wisely.primary.datasource.password=gis
 
wisely.secondary.datasource.driverClassName=oracle.jdbc.OracleDriver
wisely.secondary.datasource.url=jdbc\:oracle\:thin\:@192.168.1.103\:1522\:xe
wisely.secondary.datasource.username=gis
wisely.secondary.datasource.password=gis

2 datasource配置

第一个数据源

@Configuration
public class DataSourcePrimaryConfig {

	@Bean(name = "primaryDS") @Qualifier("primaryDS")
	@Primary
	@ConfigurationProperties(prefix="wisely.primary.datasource")
	public DataSource primaryDataSource(){
		return DataSourceBuilder.create().build();
	}

}

第二个数据源

@Configuration
public class DataSourceSecondaryConfig {
	@Bean(name = "secondaryDS") @Qualifier("secondaryDS")
	@ConfigurationProperties(prefix="wisely.secondary.datasource")
	public DataSource secondaryDataSource(){
		return DataSourceBuilder.create().build();
	}
}

3 实体管理器及事务管理器配置

第一个数据源

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef="entityManagerFactoryPrimary",transactionManagerRef="transactionManagerPrimary",basePackages= { "com.wisely.demo.dao.one" })//设置dao（repo）所在位置
public class RepositoryPrimaryConfig {
	  @Autowired
	  private JpaProperties jpaProperties;

	  @Autowired @Qualifier("primaryDS")
	  private DataSource primaryDS;

	  @Bean(name = "entityManagerPrimary")
	  @Primary
	  public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
	      return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
	  }

	  @Bean(name = "entityManagerFactoryPrimary")
	  @Primary
	  public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {
	      return builder
	              .dataSource(primaryDS)
	              .properties(getVendorProperties(primaryDS))
	              .packages("com.wisely.demo.domain.one") //设置实体类所在位置
	              .persistenceUnit("primaryPersistenceUnit")
	              .build();
	  }

	  private Map<String, String> getVendorProperties(DataSource dataSource) {
	      return jpaProperties.getHibernateProperties(dataSource);
	  }

	  @Bean(name = "transactionManagerPrimary")
	  @Primary
	  PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
	      return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
	  }

}

第二个数据源

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef="entityManagerFactorySecondary",transactionManagerRef="transactionManagerSecondary",basePackages= { "com.wisely.demo.dao.two" })
public class RepositorySecondaryConfig {
	  @Autowired
	  private JpaProperties jpaProperties;

	  @Autowired @Qualifier("secondaryDS")
	  private DataSource secondaryDS;

	  @Bean(name = "entityManagerSecondary")
	  public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
	      return entityManagerFactorySecondary(builder).getObject().createEntityManager();
	  }

	  @Bean(name = "entityManagerFactorySecondary")
	  public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary (EntityManagerFactoryBuilder builder) {
	      return builder
	              .dataSource(secondaryDS)
	              .properties(getVendorProperties(secondaryDS))
	              .packages("com.wisely.demo.domain.two")
	              .persistenceUnit("secondaryPersistenceUnit")
	              .build();
	  }

	  private Map<String, String> getVendorProperties(DataSource dataSource) {
	      return jpaProperties.getHibernateProperties(dataSource);
	  }

	  @Bean(name = "transactionManagerSecondary")
	  PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
	      return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
	  }

}

4 使用

此时来自不同数据库的dao（repo）可以任意在其它的bean里注入

@Controller
public class TestController {
	@Autowired
	SysRoleRepo1 sysRoleRepo1;
	@Autowired
	SysRoleRepo2 sysRoleRepo2;
	@RequestMapping("/test")
	public @ResponseBody String test(){
		System.out.println(Lists.newArrayList(sysRoleRepo1.findAll()).size());
		System.out.println(Lists.newArrayList(sysRoleRepo2.findAll()).size());
		return "ok";
	} 
}

新书推荐《JavaEE开发的颠覆者: Spring Boot实战》，涵盖Spring 4.x、Spring MVC 4.x、Spring Boot企业开发实战。

京东地址：http://item.jd.com/11894632.html

当当地址：http://product.dangdang.com/23926195.html

亚马逊地址：http://www.amazon.cn/图书/dp/B01D5ZBFUK/ref=zg_bsnr_663834051_6 

淘宝地址:https://item.taobao.com/item.htm?id=528426235744&ns=1&abbucket=8#detail

或自己在京东、淘宝、亚马逊、当当、互动出版社搜索自选。