首页 计算机学科 java spring 代码案例

  • 单例模式

  • @Scope("singleton")

BookDaoImpl

@SuppressWarnings("all")
@Repository
@Scope("singleton")
public class BookDaoImpl implements BookDao {
    public void save(){
        System.out.println("BookDaoImpl save rning...");
    }
}

测试代码

public void test(){
        ApplicationContext c = new AnnotationConfigApplicationContext(SpringConfig.class);
        BookDao dao = c.getBean(BookDao.class);
        System.out.println(dao);
        BookDao dao1 = c.getBean(BookDao.class);
        System.out.println(dao1);
        dao.save();
    }

Run 结果

image_2023-02-24-21-55-33

  • 非单例模式

  • @Scope("prototype")

BookDaoImpl

@SuppressWarnings("all")
@Repository
@Scope("prototype")
public class BookDaoImpl implements BookDao {
    public void save(){
        System.out.println("BookDaoImpl save rning...");
    }
}

测试类代码

public void test(){
        ApplicationContext c = new AnnotationConfigApplicationContext(SpringConfig.class);
        BookDao dao = c.getBean(BookDao.class);
        System.out.println(dao);
        BookDao dao1 = c.getBean(BookDao.class);
        System.out.println(dao1);
        dao.save();
    }

Run Result

image_2023-02-24-21-56-44