Day 88

_Spring技术–注解开发–依赖注入

1. Spring提供@Component注解的三个衍生注解

   • @Controller：用于表现层bean定义
   • @Service：用于业务层bean定义
   • @Repository：用于数据层bean的定义

2. 纯注解开发时不需要配置applictionContext.xml文件：

3. 虽然不用xml文件定义，但是需要新建一个配置包，在里面配置bean：

4. 

5. 

6. 在test文件中编写测试java程序实现注解依赖注入：

   • package test;
     
     import com.Alvis.config.SpringConfig;
     import com.Alvis.dao.BookDao;
     import com.Alvis.service.BookService;
     import com.Alvis.service.impl.BookServiceImpl;
     import org.springframework.context.ApplicationContext;
     import org.springframework.context.annotation.AnnotationConfigApplicationContext;
     import org.springframework.context.support.ClassPathXmlApplicationContext;
     
     public class App_01 {
         public static void main(String[] args) {
             // 配置文件
             ApplicationContext apx = new AnnotationConfigApplicationContext(SpringConfig.class);
     
             BookDao bookDao = (BookDao) apx.getBean("bookDao");
             bookDao.run();
     
             System.out.println("----------------------------------");
     
             BookService bookService = (BookService) apx.getBean(BookServiceImpl.class);
             bookService.run();
     
         }
     }
     =============================================
     this is BookDao......
     ----------------------------------
     this is BookService......
     this is BookDao......
     
     进程已结束,退出代码0
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_Spring技术–纯注解开发–依赖注入对应多个bean

1. 如图所示：

2. 在test文件中编写测试程序实现需求：

3. package test;
   
   import com.Alvis.config.SpringConfig;
   import com.Alvis.dao.BookDao;
   import com.Alvis.service.BookService;
   import com.Alvis.service.impl.BookServiceImpl;
   import com.Alvis.service.impl.BookServiceImplCopy;
   import org.springframework.context.ApplicationContext;
   import org.springframework.context.annotation.AnnotationConfigApplicationContext;
   import org.springframework.context.support.ClassPathXmlApplicationContext;
   
   public class App_01 {
       public static void main(String[] args) {
           // 配置文件
           ApplicationContext apx = new AnnotationConfigApplicationContext(SpringConfig.class);
   
           BookDao bookDao = (BookDao) apx.getBean("bookDao");
           bookDao.run();
   
           System.out.println("----------------------------------");
   
           BookService bookService = (BookService) apx.getBean(BookServiceImplCopy.class);
           bookService.run();
   
       }
   }
   ==========================================
   this is BookDao......
   ----------------------------------
   this is **Not** BookServiceCopy......
   this is BookDao......
   
   进程已结束,退出代码0
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_Spring技术–纯注解开发–@PropertySource

1. 在配置类中定义配置注解@PropertySource：

   • 注意：@PropertySource中后接的配置文件的路径默认在resources文件中，而且不需要加额外的同等路径
   • 

2. 

3. 在resources中配置值文件：

4. 最后在test文件中编写Java程序实现需求：

5. package test;
   
   import com.Alvis.config.SpringConfig;
   import com.Alvis.service.InkService;
   import com.Alvis.service.impl.InkServiceImpl;
   import org.springframework.context.ApplicationContext;
   import org.springframework.context.annotation.AnnotationConfigApplicationContext;
   
   public class App_02 {
       public static void main(String[] args) {
           // 获取配置类
           ApplicationContext apx = new AnnotationConfigApplicationContext(SpringConfig.class);
   
           InkService inkService =apx.getBean(InkServiceImpl.class);
           inkService.run();
       }
   }
   =====================================
   this is InkService...
   this is InkDao...
   age: 100 name: "zhangsan"
   
   进程已结束,退出代码0
   
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