loginservlet.java

一个完整的网上书店

package com.ascenttech.ebookstore.servlet;

import javax.servlet.*;
import javax.servlet.http.*;

import com.ascenttech.ebookstore.bean.*;
import com.ascenttech.ebookstore.shopcart.ShoppingCart;
import com.ascenttech.ebookstore.util.*;

import java.io.*;
import java.util.*;
import java.sql.*;
public class LoginServlet extends HttpServlet {
  private static final String CONTENT_TYPE = "text/html; charset=GBK";
  private   ServletContext sc=null;
  
  //Initialize 
  public void init() throws ServletException {
    super.init();
    sc=this.getServletContext();
  }

  //Process the HTTP Get request
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
    String varname = request.getParameter("usename");
    String varpassword = request.getParameter("password");
    String reg = request.getParameter("Submit2");
	  if(reg !=null){
	    response.sendRedirect("register.jsp");
	    return;
	  }
	  String register = request.getParameter("register");
	  if(register!=null){
	    doRegister(request, response);
	    return;
	  }
	
	  boolean succ=false;
	  Customer cu=new Customer();
	  try {
	    succ = cu.login(varname,varpassword);
	  }
	  catch (SQLException ex) {
	    ex.getErrorCode();
	  }
	  String username=varname;
	  if(succ){
	
	       this.doBrowse(request, response);
	       HttpSession mysession = request.getSession(false);
	       ShoppingCart mycart = new ShoppingCart();
	       mysession.setAttribute(username,mycart);
	       mysession.setAttribute("username",username);
	       
	  }
	  else{
	       this.doError(request, response);
	
	  }
	  return;
  }

  //Process the HTTP Post request
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
    doGet(request, response);
  }
  
  private void doBrowse(HttpServletRequest request, HttpServletResponse response) throws
     ServletException, IOException{
     RequestDispatcher rd=sc.getRequestDispatcher("/querybook.jsp");
     rd.forward(request,response);
  }

  private void doRegister(HttpServletRequest request, HttpServletResponse response) throws
     ServletException, IOException{
     Customer cust = new Customer();
     cust.setUser(request.getParameter("username"));
     cust.setPassword(request.getParameter("password"));
     cust.setName(request.getParameter("name"));
     cust.setTitle(request.getParameter("title"));
     cust.setEmail(request.getParameter("email"));
     try {
      cust.saveInfo();
     }
     catch (Exception ex) {
      ex.printStackTrace();
     }
     RequestDispatcher rd=sc.getRequestDispatcher("/login.jsp");
     rd.forward(request,response);
  }

  private void doBrowseErr(HttpServletRequest request, HttpServletResponse response) throws
           ServletException, IOException{
         RequestDispatcher rd=sc.getRequestDispatcher("/login.jsp");
         rd.forward(request,response);
  }
 
  private void doError(HttpServletRequest request, HttpServletResponse response) throws
           ServletException, IOException{
          request.setAttribute("error","name or password error!");
          this.doBrowseErr(request, response);
  }
  //Clean up resources
  public void destroy() {
  }
}