indexservlet.java

基于jsp的网上书店

//负责首页显示请求。
package shop;
import java.util.Vector;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
public final class IndexServlet extends HttpServlet{ 
	
	public IndexServlet(){
		super();
	}
	
	public void init(ServletConfig config)throws ServletException{
		super.init(config);
	}
		public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
			HttpSession session = req.getSession();
			if(session==null){
				System.out.println("no session");
				System.exit(1);
				
			}
	
		//利用数据库中相关的操作
			DB db = new DB();
	        shop sp=new shop();
			Vector sortList = null;
			Vector timeProductList = null;
			Vector countProductList = null;
			try {
				sortList = sp.getSorts(db);
				PrintWriter out=resp.getWriter();
				out.print("数据库已连接上 ");
				timeProductList = sp.getTopProducts(db,1);
				countProductList = sp.getTopProducts(db,2);
			} catch (Exception e1) {
				// TODO 自动生成 catch 块
				e1.printStackTrace();
			}
		 
			try {
				 session.setAttribute("sortList",sortList);
	             session.setAttribute("timeProductList",timeProductList);
	             session.setAttribute("countProductList",countProductList);
				
			} catch (Exception e) {
				e.printStackTrace();
			}
				
			db.close();
			String target = "/index.jsp";
			resp.sendRedirect(target);
			
 	}

}