javaweb简单模拟购物车

下面的代码主要实现了保存密码，自动登录，用Session保存购买信息的功能。

BookAddedListener.java

package ex2;

import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;

/**
 * @author 高尉峰
 *
 */
public class BookAddedListener implements HttpSessionAttributeListener{

	@Override
	public void attributeAdded(HttpSessionBindingEvent event) {
		// TODO Auto-generated method stub
		System.out.println(event.getName()+":"+event.getValue());
	}

	@Override
	public void attributeRemoved(HttpSessionBindingEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void attributeReplaced(HttpSessionBindingEvent event) {
		// TODO Auto-generated method stub
		System.out.println(event.getName()+":"+event.getValue());
	}

}

CheckFilter.java

package ex2;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CheckFilter implements Filter {

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) arg0;
		HttpServletResponse response = (HttpServletResponse) arg1;
		Cookie[] cookies = request.getCookies();
		String name = "";
		String passwd = "";
		// 遍历cookie
		if (cookies != null) {
			for (Cookie coo : cookies) {
				if (coo.getName().equals("loginInfo")) {
					String[] info = coo.getValue().split(",");
					name = info[0];
					passwd = info[1];
				}
			}
		}
		// 如果在cookie中得到保存的用户名和密码，验证正确后，直接转到主页
		if (new LoginBiz().isValid(name, passwd)) {
			response.sendRedirect(request.getContextPath() + "/bookstore.html");
		} else {
			arg2.doFilter(request, response);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {

	}

	public void destroy() {

	}

}

LoginAction.java

package ex2;

import java.io.IOException;  
import java.io.PrintWriter;  
  
import javax.servlet.ServletException;  
import javax.servlet.http.Cookie;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
  
/**
 * @author 高尉峰
 *
 */
public class LoginAction extends HttpServlet {  
    public void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
    	//获取请求参数
        String name=request.getParameter("name");  
        String passwd=request.getParameter("passwd");  
        String savetimeString=request.getParameter("savetime");  
          
        if(new LoginBiz().isValid(name, passwd)){  
            int savetime=Integer.parseInt(savetimeString)*24*3600;  
            //创建cookie对象
            Cookie loginInfo=new Cookie("loginInfo",name+","+passwd);  
            //设置cookie最大存活时间
            loginInfo.setMaxAge(savetime);
            //服务端向客户端响应cookie
            response.addCookie(loginInfo);  
           //登陆成功转向主页
            response.sendRedirect(request.getContextPath() +"/bookstore.html");  
        }else{  
            response.sendRedirect(request.getContextPath() +"/login.jsp");  
        }  
    }  
      
}  

LoginBiz.java

package ex2;
/**
 * @author高尉峰
 *javaBean
 */
public class LoginBiz  {  
    static  boolean isValid(String name,String passwd){  
    if(name.equals("1")&&passwd.equals("1")){  
        return true;  
    }else{  
        return false;  
    }  
}  
}  

ShoppingCart.java

package ex2;

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

public class ShoppingCart extends HttpServlet {
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest
	 * , javax.servlet.http.HttpServletResponse)
	 */
	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		/*
		 * (non-Javadoc) 取得Session对象如果Session不存在，为本次会话创建此对象
		 */
		HttpSession session = req.getSession(true);
		Integer itemCount = (Integer) session.getAttribute("itemCount");
		// 如果session是新的
		if (itemCount == null)
			itemCount = new Integer(0);

		PrintWriter out = res.getWriter();
		res.setContentType("text/html");

		// 接收传来的参数
		String[] itemsSelected;
		String itemName;
		itemsSelected = req.getParameterValues("item");

		if (itemsSelected != null) {
			for (int i = 0; i < itemsSelected.length; i++) {
				itemName = itemsSelected[i];
				System.out.println(itemName);
				itemCount = new Integer(itemCount.intValue() + 1);
				// 购买的条目
				session.setAttribute("item" + itemCount, itemName);
				// 总条目
				session.setAttribute("itemCount", itemCount);
			}
		}

		out.println("");
		out.println("");
		out.println("
Session List:


");
		for (int i = 1; i <= itemCount.intValue(); i++) {
			out.println((String) session.getAttribute("item" + i) + "
");
		}
		out.println("");
		out.println("");
		out.close();
	}
}

bookstore.html

A Book Store

Choose following information:

  

    
 
      
 
        
      
      
Item1: Thinking in Java
    
    
 
      

        
      
      
Item2: Head first servlets and JSP
    
    
 
      

        
      
      
Item3: Enterprise JavaBeans 3.0
    
  
  

  

    
  

 

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>









	

		

			
			


				
				

					账号 

				
				

					密码 
				
				

					保存时间 
						一周
						一个月
					
				
				
				

					登录