servlet实现的一个简单web程序

package web; import java.io.IOException; import java.io.PrintWriter; import java.util.List; 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 util.DAOFactory; import dao.PicDAO; import dao.UserDAO; import entity.Pic; import entity.User; public class ActionServlet extends HttpServlet { public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); String uri = request.getRequestURI(); String action = uri.substring(uri.lastIndexOf("/"), uri .lastIndexOf(".")); if (action.equals("/regist")) { String username = request.getParameter("username"); String pwd = request.getParameter("pwd"); String name = request.getParameter("name"); int age = Integer.parseInt(request.getParameter("age")); String gender = request.getParameter("gender"); String phone = request.getParameter("phone"); String ask = request.getParameter("ask"); try { UserDAO userDAO = DAOFactory.getUserDAO(); User user = new User(); user.setUsername(username); user.setPwd(pwd); user.setName(name); user.setAge(age); user.setGender(gender); user.setPhone(phone); user.setAsk(ask); userDAO.save(user); response.sendRedirect("login.jsp"); } catch (Exception e) { e.printStackTrace(); throw new ServletException(e); } } else if (action.equals("/login")) { String number1 = request.getParameter("number"); HttpSession session = request.getSession(); String number2 = (String) session.getAttribute("number"); if (!number1.equalsIgnoreCase(number2)) { request.setAttribute("checkcode_error", "验证码错误"); request.getRequestDispatcher("login.jsp").forward(request, response); return; } else { String username = request.getParameter("username"); String pwd = request.getParameter("pwd"); try { UserDAO userDAO = DAOFactory.getUserDAO(); User user = userDAO.findByUsername(username); if (user != null && user.getPwd().equals(pwd)) { session.setAttribute("loginUser", user); response.sendRedirect("list.do"); } else { request.setAttribute("login_error", "用户名或者密码错误"); request.getRequestDispatcher("login.jsp").forward( request, response); } } catch (Exception e) { e.printStackTrace(); throw new ServletException(e); } } } else if (action.equals("/list")) { try { UserDAO userDAO = DAOFactory.getUserDAO(); List<User> users = userDAO.findAll(); request.setAttribute("users", users); request.getRequestDispatcher("list.jsp").forward(request, response); } catch (Exception e) { e.printStackTrace(); throw new ServletException(e); } } else if (action.equals("/load")) { int id = Integer.parseInt(request.getParameter("id")); try { UserDAO userDAO = DAOFactory.getUserDAO(); PicDAO picDAO=DAOFactory.getPicDAO(); User detailUser = userDAO.findById(id); List<Pic> pics=picDAO.findByUserId(id); HttpSession session=request.getSession(); session.setAttribute("pics", pics); session.setAttribute("detailUser", detailUser); request.getRequestDispatcher("detail.jsp").forward(request, response); } catch (Exception e) { e.printStackTrace(); throw new ServletException(e); } } else if (action.equals("/modify")) { int id = Integer.parseInt(request.getParameter("id")); String pwd = request.getParameter("pwd"); String phone = request.getParameter("phone"); String ask = request.getParameter("ask"); try { UserDAO userDAO = DAOFactory.getUserDAO(); User user = userDAO.findById(id); user.setPwd(pwd); user.setPhone(phone); user.setAsk(ask); userDAO.modify(user); response.sendRedirect("list"); } catch (Exception e) { e.printStackTrace(); throw new ServletException(e); } } else if (action.equals("/logout")) { HttpSession session = request.getSession(); session.invalidate(); response.sendRedirect("login.jsp"); } else if (action.equals("/check_username")) { String username = request.getParameter("username"); try { Thread.sleep(2000); UserDAO dao = DAOFactory.getUserDAO(); User user = dao.findByUsername(username); if (user == null) { out.print("ok"); } else { out.print("error"); } } catch (Exception e) { e.printStackTrace(); throw new ServletException(e); } } else if (action.equals("/check_number")) { try { Thread.sleep(2000); String number1 = request.getParameter("number"); HttpSession session = request.getSession(); String number2 = (String) session.getAttribute("number"); if (number2 != null && number1.equalsIgnoreCase(number2)) { out.print("ok"); } else { out.print("error"); } } catch (Exception e) { e.printStackTrace(); } } } }