@SpringBootApplication(exclude = {
  DataSourceAutoConfiguration.class
})
public class TitanWebApplication {
 public static void main(String[] args) {
  SpringApplication.run(TitanWebApplication.class, args);
 }
}

# titan庫
spring.datasource.titan-master.url=jdbc:mysql://X.X.X.X:port/titan?characterEncoding=UTF-8
spring.datasource.titan-master.username=
spring.datasource.titan-master.password=
spring.datasource.titan-master.driver-class-name=com.mysql.jdbc.Driver
# 連接池配置
# 省略
# 其它庫
spring.datasource.db2.url=jdbc:mysql://X.X.X.X:port/titan2?characterEncoding=UTF-8
spring.datasource.db2.username=
spring.datasource.db2.password=
spring.datasource.db2.driver-class-name=com.mysql.jdbc.Driver

@Configuration
public class DataSourceConfig {
 @Bean(name = "titanMasterDS")
 @ConfigurationProperties(prefix = "spring.datasource.titan-master") // application.properteis中對應(yīng)屬性的前綴
 public DataSource dataSource1() {
  return DataSourceBuilder.create().build();
 }
 @Bean(name = "ds2")
 @ConfigurationProperties(prefix = "spring.datasource.db2") // application.properteis中對應(yīng)屬性的前綴
 public DataSource dataSource2() {
  return DataSourceBuilder.create().build();
 }
}

@Configuration
@MapperScan(basePackages = {"titan.mapper"}, sqlSessionFactoryRef = "sqlSessionFactory1")
public class MybatisDbAConfig {
 @Autowired
 @Qualifier("titanMasterDS")
 private DataSource ds1;
 @Bean
 public SqlSessionFactory sqlSessionFactory1() throws Exception {
  SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
  factoryBean.setDataSource(ds1); // 使用titan數(shù)據(jù)源, 連接titan庫
  return factoryBean.getObject();
 }
 @Bean
 public SqlSessionTemplate sqlSessionTemplate1() throws Exception {
  SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory1()); // 使用上面配置的Factory
  return template;
 }
}

@Configuration
@MapperScan(basePackages = {"other.mapper"}, sqlSessionFactoryRef = "sqlSessionFactory2")
public class MybatisDbBConfig {
 @Autowired
 @Qualifier("ds2")
 private DataSource ds2;
 @Bean
 public SqlSessionFactory sqlSessionFactory2() throws Exception {
  SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
  factoryBean.setDataSource(ds2);
  return factoryBean.getObject();
 }
 @Bean
 public SqlSessionTemplate sqlSessionTemplate2() throws Exception {
  SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory2());
  return template;
 }
}

public class DataSourceContextHolder {
 public static final Logger log = LoggerFactory.getLogger(DataSourceContextHolder.class);
 /**
  * 默認(rèn)數(shù)據(jù)源
  */
 public static final String DEFAULT_DS = "titan-master";
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();
 // 設(shè)置數(shù)據(jù)源名
 public static void setDB(String dbType) {
  log.debug("切換到{}數(shù)據(jù)源", dbType);
  contextHolder.set(dbType);
 }
 // 獲取數(shù)據(jù)源名
 public static String getDB() {
  return (contextHolder.get());
 }
 // 清除數(shù)據(jù)源名
 public static void clearDB() {
  contextHolder.remove();
 }
}

public class DynamicDataSource extends AbstractRoutingDataSource {
 private static final Logger log = LoggerFactory.getLogger(DynamicDataSource.class);
 @Override
 protected Object determineCurrentLookupKey() {
  log.debug("數(shù)據(jù)源為{}", DataSourceContextHolder.getDB());
  return DataSourceContextHolder.getDB();
 }
}

/**
  * 動(dòng)態(tài)數(shù)據(jù)源: 通過AOP在不同數(shù)據(jù)源之間動(dòng)態(tài)切換
  * @return
  */
 @Bean(name = "dynamicDS1")
 public DataSource dataSource() {
  DynamicDataSource dynamicDataSource = new DynamicDataSource();
  // 默認(rèn)數(shù)據(jù)源
  dynamicDataSource.setDefaultTargetDataSource(dataSource1());
  // 配置多數(shù)據(jù)源
  Map<Object, Object> dsMap = new HashMap(5);
  dsMap.put("titan-master", dataSource1());
  dsMap.put("ds2", dataSource2());
  dynamicDataSource.setTargetDataSources(dsMap);
  return dynamicDataSource;
 }

@Retention(RetentionPolicy.RUNTIME)
@Target({
  ElementType.METHOD
})
public @interface DS {
 String value() default "titan-master";
}

@Aspect
@Component
public class DynamicDataSourceAspect {
 @Before("@annotation(DS)")
 public void beforeSwitchDS(JoinPoint point){
  //獲得當(dāng)前訪問的class
  Class<?> className = point.getTarget().getClass();
  //獲得訪問的方法名
  String methodName = point.getSignature().getName();
  //得到方法的參數(shù)的類型
  Class[] argClass = ((MethodSignature)point.getSignature()).getParameterTypes();
  String dataSource = DataSourceContextHolder.DEFAULT_DS;
  try {
   // 得到訪問的方法對象
   Method method = className.getMethod(methodName, argClass);
   // 判斷是否存在@DS注解
   if (method.isAnnotationPresent(DS.class)) {
    DS annotation = method.getAnnotation(DS.class);
    // 取出注解中的數(shù)據(jù)源名
    dataSource = annotation.value();
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  // 切換數(shù)據(jù)源
  DataSourceContextHolder.setDB(dataSource);
 }
 @After("@annotation(DS)")
 public void afterSwitchDS(JoinPoint point){
  DataSourceContextHolder.clearDB();
 }
}

@Autowired
 private UserAModelMapper userAMapper;
 @DS("titan-master")
 public String ds1() {
  return userAMapper.selectByPrimaryKey(1).getName();
 }
 @DS("ds2")
 public String ds2() {
  return userAMapper.selectByPrimaryKey(1).getName();
 }