基于Servlet+JSP+Jquery+EL+Ajax的餐饮管理系统.zip

package com.xyp.web; import com.google.gson.Gson; import com.xyp.domain.User; import com.xyp.service.impl.UserServiceImpl; import com.xyp.utils.WebUtils; 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 java.io.IOException; import java.lang.reflect.Method; import java.sql.SQLException; import java.util.HashMap; import static com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY; public class UserServlet extends BaseServlet{ private UserServiceImpl userService = new UserServiceImpl(); protected void loginOut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 1、销毁 Session 中用户登录的信息（或者销毁 Session） // 2、重定向到首页（或登录页面）。 req.getSession().invalidate(); resp.sendRedirect(req.getContextPath()); } protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username = req.getParameter("username"); String password = req.getParameter("password"); try { User login = userService.login(WebUtils.copyParamToBean(req.getParameterMap(), new User())); if(login == null){ //没有该用户，登录失败 System.out.println("该用户不存在"); //请求转发，请求域中的数据login.jsp中也能用 req.setAttribute("errorMsg","用户名或密码错误"); req.setAttribute("uesrname",username); req.setAttribute("password",password); req.getRequestDispatcher("/pages/user/login.jsp").forward(req,resp); }else{ //存在该用户，登陆成功 System.out.println("登陆成功"); req.getSession().setAttribute("loginUser",login); req.getRequestDispatcher("/pages/user/login_success.jsp").forward(req,resp); } } catch (Exception e) { // e.printStackTrace(); throw new RuntimeException(e); } } protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 1.获取请求的参数（其中有密码，用doPost()方法） String username = req.getParameter("username"); String password = req.getParameter("password"); String email = req.getParameter("email"); String code = req.getParameter("code"); //内容回显 req.setAttribute("username",username); req.setAttribute("password",password); req.setAttribute("email",email); // 2.检查 验证码是否正确 先写死，后面再改，验证码是abcde // 获取 Session 中的验证码 String token = (String) req.getSession().getAttribute(KAPTCHA_SESSION_KEY); // 删除 Session 中的验证码 req.getSession().removeAttribute(KAPTCHA_SESSION_KEY); if(token != null && token.equalsIgnoreCase(code)){ try { //验证码正确 //3. 用户名是否已存在 if(userService.existUsername(username)){ //返回true,则存在 System.out.println("用户名["+username+"]已存在"); req.setAttribute("errorMsg","用户名已存在"); req.getRequestDispatcher("/pages/user/regist.jsp").forward(req,resp); }else{ //返回flase ,表示用户名不存在，可以使用 //4.保存用户信息 // userService.registerUser(new User(null,username,password,email)); userService.registerUser(new User(null,username,password,email,"user")); //跳转到用户成功注册界面 req.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req,resp); } } catch (SQLException e) { throw new RuntimeException(e); } }else{ //不相等 req.setAttribute("errorMsg","验证码错误"); System.out.println("验证码["+code+"]不正确"); req.getRequestDispatcher("/pages/user/regist.jsp").forward(req,resp); } } /** * 判断用户名是否存在，把结果返回给请求页面（响应），用到了AJAX技术（优点异步更新） * @param req * @param resp * @throws ServletException * @throws IOException */ protected void ajaxExistsUsername(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException, SQLException { String username = req.getParameter("username"); boolean existUsername = userService.existUsername(username); //把结果封装成一个Map对象 HashMap<String, Object> resultMap = new HashMap<>(); resultMap.put("existUsername",existUsername); //把它转成JSON对象，在返回给客户端 Gson gson = new Gson(); String json = gson.toJson(resultMap); resp.getWriter().write(json); } }