(1) Homepage controller 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);
}
}
News service interface mvc.service/NewsService.java
package mvc.service;
import java.util.List;
import mvc.bean.News;
public interface NewsService{
public List<News> queryAll();
}
The implementation class of the news service interface mvc.service.imp/NewsServiceImp.java uses the method of calling the data access layer interface
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();
}
The reality class mvc.service/NewsServiceImp.java of the news server interface adopts the method of calling the data access layer interface,
package mvc.service.imp;
import java.util.List;
import mvc.bean.News;
import mvc.dao.NewsDao;
import mvc.dao.imp.News