mybatis 动态切换数据源

public class DynamicDataSource extends AbstractRoutingDataSource {
    @Override
    protected Object determineCurrentLookupKey() {
        return DataSourceContextHolder.getDataSource();
    }
}

public class DataSourceContextHolder {
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();

    public static void setDataSource(String dataSource) {
        contextHolder.set(dataSource);
    }

    public static String getDataSource() {
        return contextHolder.get();
    }

    public static void clearDataSource() {
        contextHolder.remove();
    }
}

@Aspect
@Component
public class DataSourceAspect {
    @Around("@annotation(com.example.annotation.TargetDataSource)")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        MethodSignature signature = (MethodSignature) point.getSignature();
        Method method = signature.getMethod();
        TargetDataSource dataSource = method.getAnnotation(TargetDataSource.class);
        if (dataSource != null) {
            DataSourceContextHolder.setDataSource(dataSource.value());
        }
        try {
            return point.proceed();
        } finally {
            DataSourceContextHolder.clearDataSource();
        }
    }
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface TargetDataSource {
    String value();
}

public interface UserMapper {
    @TargetDataSource("master")
    void save(User user);

    @TargetDataSource("slave")
    User findById(Long id);
}