Session代码.doc

Login.javapackage Session;import java.io.IOException;import java.io.PrintWriter;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 class Login extends HttpServlet public Login() super();public void destroy() super.destroy(); / Just puts destroy string in log/ Put your code herepublic void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException this.doPost(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setContentType(text/html);/ 处理中文乱码request.setCharacterEncoding(utf-8);response.setCharacterEncoding(utf-8);PrintWriter out = response.getWriter();/ session创建，得到的是Session内置对象，永远不为空HttpSession session = request.getSession();/ 用户名和密码的获取String userName = request.getParameter(userName);String pwd = request.getParameter(pwd);/ 用户名和密码判断if (userName.equals(admin) & pwd.equals(123456) User user = new User(userName, pwd);/ 保存数据session.setAttribute(user, user);response.sendRedirect(/Web/servlet/GoodsList); else response.sendRedirect(/Web/Login.html);public void init() throws ServletException / Put your code hereGoodsList.javapackage Session;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;import javax.servlet.http.HttpSession;public class GoodsList extends HttpServlet public GoodsList() super();public void destroy() super.destroy(); / Just puts destroy string in log/ Put your code herepublic void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException this.doPost(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setContentType(text/html);/ 中文乱码处理response.setCharacterEncoding(utf-8);request.setCharacterEncoding(utf-8);PrintWriter out = response.getWriter();HttpSession session = request.getSession();String Id = session.getId();/ 创建一个session获取Login.java中的user参数User user = (User) session.getAttribute(user);if (user = null) out.println(此用户没有登录，请重新登录。登陆); else out.println(华硕1购买);out.println(联想2购买);out.println(戴尔3购买);out.println(宏碁4购买);out.println( 您最近所购买的商品有： );Cookie cookie = request.getCookies();for (int i = 0; i cookie.length; i+) if (!cookiei.getName().equals(JSESSIONID) out.println(cookiei.getValue() + );public void init() throws ServletException / Put your code hereGoods.javapackage Session;import java.io.IOException;import java.io.PrintWriter;import java.util.Enumeration;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class Goods extends HttpServlet public Goods() super();public void destroy() super.destroy(); / Just puts destroy string in logpublic void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException this.doPost(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setContentType(text/html);/ 中文乱码处理response.setCharacterEncoding(utf-8);request.setCharacterEncoding(utf-8);PrintWriter out = response.getWriter();HttpSession session = request.getSession();/ 传参数User user = (User) session.getAttribute(user);if (user = null) out.println(此用户没有登录，请重新登录。登陆); else / 获取Goods中的name参数String name = request.getParameter(name);/ 到数据库去 把这个ID相关的东西全部取出来session.setAttribute(name, 商品 + name);out.println( 已购买的商品 );Enumeration goods = session.getAttributeNames();while (goods.hasMoreElements() String good = goods.nextElement();/ user为session，判断是否存在if (!good.equals(user) String value = (String) session.getAttribute(good);out.println( + value);/ 利用cookie保存用户浏览过的商品good = new String(good.getBytes(iso-8859-1), utf-8);value = new String(value.getBytes(iso-8