f0c0f7f4cf09001c1e55e65ab0183fc2

这是一个小程序 网上书店用的 我们学生做的一个小实验

import bean.*;
import java.io.IOException;
import java.net.URLEncoder;
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;
import bean.Customer;

/**
 * Class <b>CustomerLoginController</b> contains 
 * the servlet controller functionality for processing
 * customer login requests.
 * 
 *
 * @author ProjectGroup
 * @version 1.0.0
 */
public class CustomerLoginController extends Controller {
    
    /**
     * CustomerLoginController doPost method.  This is can be called
     * by <b>Controller</b> superclass' doGet() method.
     * @param req HttpServletRequest servlet request object
     * @param res HttpServletResponse servlet response object
     * @throws ServletException
     * @throws IOException
     */
    public void doPost (HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException {
	
	// Get the session object.
	HttpSession session = req.getSession();
	
	// Lets invalidate the session to get rid of the unnecessary objects.
	session.invalidate();
	
	// Get a fresh HttpSession.
	session = req.getSession();
	
	// Get the username and password parameters from the customer log in form.
	String num = req.getParameter("num");
	String passWord = req.getParameter("passwd");
	
	// Attempt to validate the customer.
	Customer customer = new Customer();
	
	try {
	    customer = StoreCustomer.getCustomer(num,passWord);
	} catch( Exception e ){
	    sendErrorRedirect(req, res, e);
	}
	
	try {
	    // Place the customer bean back into the session.
	    if (customer.getNum()!=null) {
		session.setAttribute("customer", customer);
		res.sendRedirect("/e-commerce/customeraccount.jsp");
	    } else {
		// If the customer object is null, then validation has failed.  Tell this to the user.
		res.sendRedirect("/e-commerce/error.jsp");
	    }
	    return;
	} catch (Exception e) {
	    // Send the exception to the standard error page.
	    sendErrorRedirect(req, res, e);
	    return;
	}
    }
}