indexservlet.java

简单的网上图书书店

package shopcart;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class indexServlet extends HttpServlet
{
    public void service(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException 
    {
        String cmd;
        cmd=req.getParameter("cmd");
        String s,s1,s2,s3,s4,s5,s6,s7,s8,s9;
        s="";
        s1="login";
        s2="logout";
        s3="cart";
        s4="clear";
        s5="order";
        s6="main";
        s7="list";
        s8="remove";
        s9="init";
        if(cmd==null)
        {
            resp.sendRedirect("shopcart/login.jsp");
        }
        if(s.equals(cmd))
        {
            resp.sendRedirect("shopcart/login.jsp");
        }
        else if(s1.equals(cmd))
        {
            resp.sendRedirect("shopcart/login.jsp");
        }
        else if(s2.equals(cmd))
        {
            resp.sendRedirect("shopcart/logout.jsp");
        }
        else if(s3.equals(cmd))
        {
            resp.sendRedirect("shopcart/cart.jsp");
        }
        else if(s4.equals(cmd))
        {
            resp.sendRedirect("shopcart/clear.jsp");
        }
        else if(s5.equals(cmd))
        {
            resp.sendRedirect("shopcart/order.jsp");
        }
        else if(s6.equals(cmd))
        {
            resp.sendRedirect("shopcart/main.jsp");
        }
        else if(s7.equals(cmd))
        {
            resp.sendRedirect("shopcart/list.jsp");
        }
        else if(s8.equals(cmd))
        {
            String id=req.getParameter("id");
            resp.sendRedirect("shopcart/remove.jsp?id="+id);
        }
        else if(s9.equals(cmd))
        {
            resp.sendRedirect("shopcart/init.jsp");
        }
    }
}