The qualifier may contain a String value in which caseSpring will attempt to match by name.
qualifier可以包含一个字符串值，在这种情况下，Spring会试图通过名字来找到对应的对象。
2
This example setup supports the use of stateless service and data access (DAO) layers that are configured using a lightweight container, in this caseSpring.
这个例子设置支持使用以轻量级容器（这里就是 Spring）配置的无状态服务和数据访问（DAO）层。
3
In this case, Spring finds this one class and instantiates it for you.