学习Spring的一点代码01：如何获取bean?

 首先：写一个接口

 

package cn.sisy.dao;

public interface UserDao {
	public void addUser();
}

 

然后：一个实现类

 

public class UserDaoImpl implements UserDao {

	public void addUser() {
		System.out.println("调用了addUser方法");
	}
}

 

再写：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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
          <bean id="userDao" class="cn.sisy.dao.impl.UserDaoImpl"></bean>
</beans>

 

最好：写一个测试类

 

public class TestUserDao {
	private static UserDao userDao;
	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
		try {
			ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
			userDao = (UserDao) cxt.getBean("userDao");
		} catch (RuntimeException e) {
			e.printStackTrace();
		}
	}
	@Test public void addUser() {
		userDao.addUser();
	}
}

 

 代码：附件~~~