尚硅谷JavaWeb电子书城项目(Java+Mysql+Tomcat+Jsp)

package com.servlet; import com.google.gson.Gson; import com.google.gson.JsonObject; import com.google.gson.JsonPrimitive; import com.pojo.User; import com.service.UserService; import com.service.impl.UserServiceImpl; import com.utils.WebUtils; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; import java.io.PrintWriter; @WebServlet(name = "UserServlet", urlPatterns = "/UserServlet") public class UserServlet extends BaseServlet { private final UserService userService = new UserServiceImpl(); protected void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); //1.获取表单参数 String username = request.getParameter("username"); User user = WebUtils.copyParamToBean(request.getParameterMap(), new User()); //自动注入 user = userService.login(user); if (user != null) { //登录成功, 跳转到成功页面 HttpSession session = request.getSession(); //创建Session域对象 session.setAttribute("user", user); request.getRequestDispatcher("pages/user/login_success.jsp").forward(request, response); } else { //登录失败, 将错误信息和回显信息放到request域中, 然后跳转回登录页面 request.setAttribute("msg", "账号或密码错误!"); request.setAttribute("username", username); request.getRequestDispatcher("pages/user/login.jsp").forward(request, response); } } /** 验证用户名是否存在, 然后以json格式回传给客户端 */ protected void ajaxExistingUsername(HttpServletRequest request, HttpServletResponse response) throws IOException { String username = request.getParameter("username"); boolean existsUsername = userService.existsUsername(username); JsonObject jsonObject = new JsonObject(); jsonObject.add("existingUsername", new JsonPrimitive(existsUsername)); response.setContentType("application/json"); PrintWriter writer = response.getWriter(); new Gson().toJson(jsonObject, writer); } /** 处理注销请求, 即让Session失效, 然后重定向到主页 */ protected void logout(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(false); if (session != null) { session.invalidate(); } response.sendRedirect(request.getContextPath() + "/index.jsp"); } protected void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); //1.获取请求的参数 String username = request.getParameter("username"); String email = request.getParameter("email"); //2.验证验证码 String codeParamKey = "code"; if (!WebUtils.validateKaptcha(request, codeParamKey)) { request.setAttribute("msg", "验证码错误!"); request.setAttribute("username", username); request.setAttribute("email", email); request.getRequestDispatcher("pages/user/regist.jsp").forward(request, response); return; } //3.检查用户名是否可用 if (userService.existsUsername(username)) { request.setAttribute("msg", "用户名已存在!"); request.setAttribute("username", username); request.setAttribute("email", email); request.getRequestDispatcher("pages/user/regist.jsp").forward(request, response); return; } //4.注册 User user = WebUtils.copyParamToBean(request.getParameterMap(), new User()); //自动注入 boolean ans = userService.register(user); if (ans) { request.getRequestDispatcher("pages/user/login.jsp").forward(request, response); } else { //注册失败时, 将错误信息和回显信息保存到request域中, 然后转发回注册页面 request.setAttribute("msg", "注册失败, 请重试!"); request.setAttribute("username", username); request.setAttribute("email", email); request.getRequestDispatcher("pages/user/regist.jsp").forward(request, response); } } }