原文地址https://www.cnblogs.com/linhp/p/5881778.html
首先，在用注解之前，先在配置文件中加入以下配置，在base-package下自动扫描目录及子目录的注解 ，具体可以下载我的代码查看，下文有连接
<context:component-scan base-package="com.hp.spring"></context:component-scan>一、@Controller 注解控制层（action）@Controllerpublic class UserAction { @Autowired private UsreService usreService; } 二、@Service 注解服务层@Servicepublic class UsreService { @Autowired private UserDao userDao; }三、@Repository 持久层@Repositorypublic class UserDao {} 四、spring4的泛型注入测试1 创建两个实体User和Rolepublic class User {} public class Role {} 2 baseDao抽取泛型基础curdpublic class BaseDao<T> { public void save(T entity){ System.out.println("Save:" + entity); }}3 两个实现类UserDao 和 RoleDao@Repositorypublic class RoleDao extends BaseDao<Role>{} @Repositorypublic class UserDao extends BaseDao<User>{} 4 baseServicepublic class BaseService<T> { @Autowired private BaseDao<T> dao;//这里会自动根据实际类型传入User或Role public void addNew(T entity){ System.out.println("addNew by " + dao); dao.save(entity); }}5 UserService 和RoleService@Servicepublic class RoleService extends BaseService<Role>{} //若注解没有指定 bean 的 id, 则类名第一个字母小写即为 bean 的 id@Servicepublic class UserService extends BaseService<User>{} 6 测试类 public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-annotation.xml"); UserService userService = (UserService) ctx.getBean("userService"); userService.addNew(new User()); RoleService roleService = (RoleService) ctx.getBean("roleService"); roleService.addNew(new Role()); }
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