（1）主页控制器mvc.servlet/HomeServlet.java

package mvc.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import mvc.bean.News;
import mvc.service.imp.NewsServiceImp;
public class HomeServlet extends HtppServlet{
    
    
	public void doFet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
    
    
	NewsService newsServiceImp=new NewsServiceImp();
	List<News> newsList=newsServiceImp.queryAll();
	request.setAttribute("newsList",newsList);
	request.getRequestDispatcher("/index.jsp").forward(request,response);
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
    
    
		doGet(request,response);
	}
}

新闻服务接口mvc.service/NewsService.java

package mvc.service;
import java.util.List;
import mvc.bean.News;
public interface NewsService{
    
    
	public List<News> queryAll();
}

新闻服务接口的实现类mvc.service.imp/NewsServiceImp.java,采用调用数据访问层接口的方式

package mvc.servivce.imp;
import java.util.List;
import mvc.bean.News;
import mvc.dao.NewsDao;
import mvc.service.NewsService;
public class NewsServiceImp implements NewsService{
    
    
	@Override
	public List<News> queryAll(){
    
    
		NewsDao newsDaoImp=new NewsDaoImp();
		try{
    
    
			return newsDaoImp.queryAll();
		}

新闻服务器接口的现实类mvc.service/NewsServiceImp.java,采用调用数据访问层接口的方式，

package mvc.service.imp;
import java.util.List;
import mvc.bean.News;
import mvc.dao.NewsDao;
import mvc.dao.imp.News