Spring @Autowiring 使用通用工厂构建的 bean

使用Spring框架的@Autowiring注解和通用工厂构建的bean是一种非常方便和灵活的方式来管理和使用依赖注入的对象。通过 ，我们将探讨如何使用@Autowiring和通用工厂构建的bean，并提供一个案例代码来演示其用法。

java
public interface HomePage {
    void showHomePage();
}

java
@Component
public class AdminHomePage implements HomePage {
    @Override
    public void showHomePage() {
        System.out.println("欢迎管理员访问首页！");
    }
}
@Component
public class UserHomePage implements HomePage {
    @Override
    public void showHomePage() {
        System.out.println("欢迎用户访问首页！");
    }
}

java
@Component
public class HomePageFactory {
    private final HomePage adminHomePage;
    private final HomePage userHomePage;
    @Autowired
    public HomePageFactory(AdminHomePage adminHomePage, UserHomePage userHomePage) {
        this.adminHomePage = adminHomePage;
        this.userHomePage = userHomePage;
    }
    public HomePage createHomePage(String role) {
        if (role.equals("admin")) {
            return adminHomePage;
        } else {
            return userHomePage;
        }
    }
}

java
@Component
public class HomeController {
    private final HomePageFactory homePageFactory;
    private final String role;
    @Autowired
    public HomeController(HomePageFactory homePageFactory, @Value("${user.role}") String role) {
        this.homePageFactory = homePageFactory;
        this.role = role;
    }
    public void showHomePage() {
        HomePage homePage = homePageFactory.createHomePage(role);
        homePage.showHomePage();
    }
}