Spring4.0的新特性

泛型依赖注入

1、 定义基础持久层

public class BaseRepository<T> {

}

2、定义基础业务层

public class BaseService<T> {

    @Autowired
    protected BaseRepository<T> repository;

    public void add(){
        System.out.println("add.......");
        System.out.println(repository);
    }
}

3、定义User持久层

@Repository
public class UserRepository extends BaseRepository<User> {

}

4、定义User业务层

@Service
public class UserService extends BaseService<User> {

}

5、测试

public class Test_generic {

    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("beans-generic.xml");

        UserService userService = (UserService) context.getBean("userService");

        System.out.println(userService);
        userService.add();

    }
}

6、Spring的xml配置文件：

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    
    <context:component-scan base-package="com.atguigu.spring.beans.generic"></context:component-scan>
</beans>