Spring通过构造注入和SET注入实现控制反转和依赖注入-----Spring框架

心已赠人 2024-03-23 17:50 66阅读 0赞

>     <?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="UserDao" class="com.powernode.spring6.dao.UserDao"/>
>         <bean id="VipDao" class="com.powernode.spring6.dao.VipDao"/>
>         <bean id="UserService" class="com.powernode.spring6.service.UserService">
>             
>             
>             
>             <property name="userDao" ref="UserDao"/>
>             <property name="vipDao" ref="VipDao"/>
>         </bean>
>     </beans>
> 
> <?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="UserDao" class="com.powernode.spring6.dao.UserDao"/>  
> <bean id="VipDao" class="com.powernode.spring6.dao.VipDao"/>  
> <bean id="UserService" class="com.powernode.spring6.service.UserService">  
>   
>   
>   
> <property name="userDao" ref="UserDao"/>  
> <property name="vipDao" ref="VipDao"/>  
> </bean>  
> </beans>

>     <?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="UserDao" class="com.powernode.spring6.dao.UserDao"/>
>         <bean id="VipDao" class="com.powernode.spring6.dao.VipDao"/>
>         <bean id="CustomerService" class="com.powernode.spring6.service.CustomerService">
>             
>             <constructor-arg index="0" ref="UserDao"/>
>             <constructor-arg index="1" ref="VipDao"/>
>         </bean>
>     </beans>
> 
> <?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="UserDao" class="com.powernode.spring6.dao.UserDao"/>  
> <bean id="VipDao" class="com.powernode.spring6.dao.VipDao"/>  
> <bean id="CustomerService" class="com.powernode.spring6.service.CustomerService">  
>   
> <constructor-arg index="0" ref="UserDao"/>  
> <constructor-arg index="1" ref="VipDao"/>  
> </bean>  
> </beans>

>     package com.powernode.spring6.test;
>     
>     import com.powernode.spring6.dao.UserDao;
>     import com.powernode.spring6.service.CustomerService;
>     import com.powernode.spring6.service.UserService;
>     import org.junit.Test;
>     import org.springframework.context.ApplicationContext;
>     import org.springframework.context.support.ClassPathXmlApplicationContext;
>     
>     public class SpringDITest
>     {
>         @Test
>         public void TestSetDI()
>         {
>             ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
>             UserDao userDao = applicationContext.getBean("UserDao", UserDao.class);
>             UserService userService = applicationContext.getBean("UserService", UserService.class);
>             //set方法注入,是在对象实例化后实现的,构造器注入是对象创建时注入的
>             userService.save();
>         }
>         @Test
>         public void TestConstruct()
>         {
>             ApplicationContext applicationContext = new ClassPathXmlApplicationContext("Beans.xml");
>             CustomerService customerService = applicationContext.getBean("CustomerService", CustomerService.class);
>             customerService.save();
>         }
>     }
> 
> package com.powernode.spring6.test;  
>   
> import com.powernode.spring6.dao.UserDao;  
> import com.powernode.spring6.service.CustomerService;  
> import com.powernode.spring6.service.UserService;  
> import org.junit.Test;  
> import org.springframework.context.ApplicationContext;  
> import org.springframework.context.support.ClassPathXmlApplicationContext;  
>   
> public class SpringDITest  
> \{  
> @Test  
> public void TestSetDI()  
> \{  
> ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");  
> UserDao userDao = applicationContext.getBean("UserDao", UserDao.class);  
> UserService userService = applicationContext.getBean("UserService", UserService.class);  
> //set方法注入,是在对象实例化后实现的,构造器注入是对象创建时注入的  
> userService.save();  
> \}  
> @Test  
> public void TestConstruct()  
> \{  
> ApplicationContext applicationContext = new ClassPathXmlApplicationContext("Beans.xml");  
> CustomerService customerService = applicationContext.getBean("CustomerService", CustomerService.class);  
> customerService.save();  
> \}  
> \}

>     package com.powernode.spring6.service;
>     
>     import com.powernode.spring6.dao.Dao;
>     import com.powernode.spring6.dao.UserDao;
>     import com.powernode.spring6.dao.VipDao;
>     
>     public class UserService
>     {
>         private UserDao userDao;
>         private VipDao vipDao;
>     //    private Dao dao;
>         //IDEA工具生成的符合Bean规范的SET方法
>         public void setUserDao(UserDao userDao)
>         {
>             this.userDao = userDao;
>         }
>     //    public void setDao(Dao dao)
>     //    {
>     //        this.dao = dao;
>     //    }
>         public void setVipDao(VipDao vipDao)
>         {
>             this.vipDao = vipDao;
>         }
>         //自定义SET方法必须以SET开始
>     //    public void setMYSQL(UserDao userDao)
>     //    {
>     //        this.userDao = userDao;
>     //    }
>         //必须提供set方法,Spring容器会调用这个SET方法来给userDao赋值(注入)
>         public void save()
>         {
>             //保存用户信息到数据库
>             userDao.insert();
>             vipDao.insert();
>         }
>     }
> 
> package com.powernode.spring6.service;  
>   
> import com.powernode.spring6.dao.Dao;  
> import com.powernode.spring6.dao.UserDao;  
> import com.powernode.spring6.dao.VipDao;  
>   
> public class UserService  
> \{  
> private UserDao userDao;  
> private VipDao vipDao;  
> // private Dao dao;  
> //IDEA工具生成的符合Bean规范的SET方法  
> public void setUserDao(UserDao userDao)  
> \{  
> this.userDao = userDao;  
> \}  
> // public void setDao(Dao dao)  
> // \{  
> // this.dao = dao;  
> // \}  
> public void setVipDao(VipDao vipDao)  
> \{  
> this.vipDao = vipDao;  
> \}  
> //自定义SET方法必须以SET开始  
> // public void setMYSQL(UserDao userDao)  
> // \{  
> // this.userDao = userDao;  
> // \}  
> //必须提供set方法,Spring容器会调用这个SET方法来给userDao赋值(注入)  
> public void save()  
> \{  
> //保存用户信息到数据库  
> userDao.insert();  
> vipDao.insert();  
> \}  
> \}

>     package com.powernode.spring6.dao;
>     
>     import org.slf4j.Logger;
>     import org.slf4j.LoggerFactory;
>     
>     public class UserDao implements Dao
>     {
>         private static final Logger logger = LoggerFactory.getLogger(UserDao.class);
>         public void insert()
>         {
>             System.out.println("数据库正在保存用户信息");
>             //使用Log4j2日志框架
>             logger.info("数据库正在保存用户信息");
>         }
>     }
> 
> package com.powernode.spring6.dao;  
>   
> import org.slf4j.Logger;  
> import org.slf4j.LoggerFactory;  
>   
> public class UserDao implements Dao  
> \{  
> private static final Logger logger = LoggerFactory.getLogger(UserDao.class);  
> public void insert()  
> \{  
> System.out.println("数据库正在保存用户信息");  
> //使用Log4j2日志框架  
> logger.info("数据库正在保存用户信息");  
> \}  
> \}

>     package com.powernode.spring6.dao;
>     
>     import org.slf4j.Logger;
>     import org.slf4j.LoggerFactory;
>     
>     public class VipDao implements Dao
>     {
>         private static final Logger logger = LoggerFactory.getLogger(UserDao.class);
>         public void insert()
>         {
>             logger.info("正在保存VIP信息");
>         }
>     }
> 
> package com.powernode.spring6.dao;  
>   
> import org.slf4j.Logger;  
> import org.slf4j.LoggerFactory;  
>   
> public class VipDao implements Dao  
> \{  
> private static final Logger logger = LoggerFactory.getLogger(UserDao.class);  
> public void insert()  
> \{  
> logger.info("正在保存VIP信息");  
> \}  
> \}

>     package com.powernode.spring6.service;
>     
>     import com.powernode.spring6.dao.Dao;
>     
>     public class CustomerService
>     {
>         private Dao userDao;
>         private Dao vipDao;
>     
>         public CustomerService(Dao userDao, Dao vipDao)
>         {
>             this.userDao = userDao;
>             this.vipDao = vipDao;
>         }
>     
>         public void save()
>         {
>             userDao.insert();
>             vipDao.insert();
>         }
>     }
> 
> package com.powernode.spring6.service;  
>   
> import com.powernode.spring6.dao.Dao;  
>   
> public class CustomerService  
> \{  
> private Dao userDao;  
> private Dao vipDao;  
>   
> public CustomerService(Dao userDao, Dao vipDao)  
> \{  
> this.userDao = userDao;  
> this.vipDao = vipDao;  
> \}  
>   
> public void save()  
> \{  
> userDao.insert();  
> vipDao.insert();  
> \}  
> \}

>     package com.powernode.spring6.dao;
>     
>     public interface Dao
>     {
>         void insert();
>     }
> 
> package com.powernode.spring6.dao;  
>   
> public interface Dao  
> \{  
> void insert();  
> \}