用註解的方式結合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("貓的叫聲......");
		
		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("資料庫層的貓的操作........");
		
	}	
	
}
 

總結：

1. Controller層匯入service（不用通過配置檔案注入了），使用@AutoWired或@Resource自動織入
2. Service層，先用註解@Service或@Component修飾Service類，再使用@Resource匯入DAO
3. DAO層，用註解@Repository修飾DAO類

注意： 每一層都要配置元件掃描

<!-- 註解驅動 自動去掃描到註解的類 -->
<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>