SpringMVC和Spring的结合方式二

我就是我 2022-05-11 03:56 179阅读 0赞

用注解的方式结合SpringMVC和Spring  
CatController.java

package com.bwf.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import com.bwf.service.ICatService;
    
    
    @Controller
    public class CatController {
    
    	@Autowired
    	private ICatService catService;
    	
    	@RequestMapping("cat")
    	public String cat(){
    		
    		System.out.println(catService);
    		catService.show();
    		
    		return "index";
    		
    	}
    	
    }

ICatService.java

package com.bwf.service;
    
    public interface ICatService {
    
    	
    	public void show();
    	
    }

CatService.java

package com.bwf.service;
    
    import javax.annotation.Resource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    import org.springframework.stereotype.Service;
    
    import com.bwf.dao.ICatDAO;
    
    @Service
    public class CatService implements ICatService {
    
    	@Resource
    	private ICatDAO catDAO;
    	
    	
    	@Override
    	public void show() {
    
    		System.out.println("猫的叫声......");
    		
    		catDAO.find();
    		
    		
    	}
    
    }

ICatDAO.java

package com.bwf.dao;
    
    public interface ICatDAO {
    
    	
    	public void find();
    	
    }

CatDAO.java

package com.bwf.dao;
    
    import org.springframework.stereotype.Component;
    import org.springframework.stereotype.Repository;
    
    
    @Repository
    public class CatDAO implements ICatDAO{
    
    	@Override
    	public void find() {
    
    System.out.println("数据库层的猫的操作........");
    		
    	}	
    	
    }

总结：

1.  Controller层导入service（不用通过配置文件注入了），使用@AutoWired或@Resource自动织入
2.  Service层，先用注解@Service或@Component修饰Service类，再使用@Resource导入DAO
3.  DAO层，用注解@Repository修饰DAO类

注意：  
每一层都要配置组件扫描

<context:component-scan base-package="com.bwf.controller"></context:component-scan>
    <context:component-scan base-package="com.bwf.service"></context:component-scan>
    <context:component-scan base-package="com.bwf.dao"></context:component-scan>