spring入門（2）---第一個spring案例

直接上圖：

源碼：

HelloDao.java

package www.csdn.spring.dao;  
      
public interface HelloDao {  
 public void sayHello();  
}

HelloDAoImpl.java

package www.csdn.spring.dao;  
      
public class HelloDaoImpl implements HelloDao{  
    public HelloDaoImpl() {  
        System.out.println("HelloDaoImpl實例化.......");  
    }  
    @Override
    public void sayHello() {  
        System.out.println("say:hello");  
    }  
      
}

DemoTest.java

package www.csdn.spring.test;  
      
import org.junit.Test;  
import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
      
import www.csdn.spring.dao.HelloDao;  
import www.csdn.spring.dao.HelloDaoImpl;  
import www.csdn.spring.service.HelloService;  
      
public class DemoTest {  
    @Test
    public void test(){  
        HelloDao helloDao = new HelloDaoImpl();  
        helloDao.sayHello();  
        /*// 容器創建 實例化容器 
             
                // 讀取 classes 路徑下面的文件  參數 動態參數、單個參數、數組 等 
                ApplicationContext context = new ClassPathXmlApplicationContext( 
                        "spring.xml"); 
                     
            //  HelloDao helloDao = (HelloDao) context.getBean("helloDaoImpl"); 
            //HelloDao helloDao =context.getBean("helloDaoImpl", HelloDao.class); 
                     
                HelloDaoImpl helloDaoImpl =context.getBean("helloDaoImpl", HelloDaoImpl.class); 
                        
                     
                //helloDao.sayHello(); 
                     
                //helloSerivceImpl 
                HelloService helloService = context.getBean("helloServiceImpl", HelloService.class); 
                 
                helloService.sayHello();*/
              
    }  
}

spring-dao.xml

<?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.xsd">  
      
      
   <!-- spring容器 就是負責創建、管理、維護Bean 並且能夠依賴注入到相應組件上 -->
   <bean id="helloDaoImpl" class="www.csdn.spring.dao.HelloDaoImpl" scope="singleton" lazy-

init="default"></bean>  
</beans>

spring-service.xml

<?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.xsd">  
      
   <bean id="helloServiceImpl" class="www.csdn.spring.service.HelloServiceImpl" scope="singleton" lazy-

init="false">  
      <property name="helloDao" ref="helloDaoImpl"  />  
   </bean>  
</beans>

spring.xml

<?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.xsd">  
            
      
   <import resource="spring-dao.xml"  />  
   <import resource="spring-service.xml"  />  
         
</beans>

執行測試類之後控制台輸出

HelloDaoImpl實例化.......

say:hello