j2EE的简单web开发

package com.eduask.servlet; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.eduask.checkUser.UserCheck; import com.eduask.vo.UserPwd; public class ActionServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; int userid = 0; String username = ""; int page = 1; /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // action值如果是update 则执行修改功能 否则都使用doPost()方法 String action = request.getParameter("action").trim(); if (action.equals("update")) { userid = Integer.parseInt(request.getParameter("userid").trim()); username = request.getParameter("username"); page = Integer.parseInt(request.getParameter("page").trim()); UserPwd us = new UserPwd(); us.setUserID(userid); us.setUserName(username); us.setPage(page); request.setAttribute("u", us); RequestDispatcher dispatcher = request .getRequestDispatcher("../action/actionOper.jsp"); dispatcher.forward(request, response); } else if(action.equals("exit")) { request.getSession().setAttribute("loginstatu", null); request.setAttribute("message", "您已退出！"); RequestDispatcher red = request .getRequestDispatcher("../login.jsp"); red.forward(request, response); } else { doPost(request, response); } } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to * post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String action = request.getParameter("action"); System.out.println(action); if (action.equals("update")) { String userpwd = request.getParameter("userpwd"); if(!userpwd.equals("")){ int roleid = Integer.parseInt(request.getParameter("rolename")); updateUser(userpwd, roleid, response); } else { response.setHeader("refresh", "0;url='pageCurrentServlet?page=" + page + "'"); } } if (action.equals("delete")) { try { String checkbox[] = request.getParameterValues("delete"); deleteUser(checkbox, response); } catch (NullPointerException e) { response.setHeader("refresh", "0;url='pageCurrentServlet?page=" + page + "'"); } } if (action.equals("alldelete")) { alldelete(response); } } private void updateUser(String userpwd, int roleid, HttpServletResponse response) throws ServletException, IOException { UserCheck us = new UserCheck(); int xx = us.update(userid, username, userpwd, roleid); if (xx > 0) { System.out.println(page); response.setHeader("refresh", "1;url='pageCurrentServlet?page=" + page + "'"); } } private void alldelete(HttpServletResponse response) { UserCheck us = new UserCheck(); boolean f = us.alldelete(); if (f) { System.out.println(page); response.setHeader("refresh", "1;url='pageCurrentServlet?page=" + page + "'"); } else { response.setHeader("refresh", "0;url='pageCurrentServlet?page=" + page + "'"); } } private void deleteUser(String[] delete, HttpServletResponse response) { // TODO Auto-generated method stub UserCheck us = new UserCheck(); boolean f = us.delete(delete); if (f) { System.out.println(page); response.setHeader("refresh", "1;url='pageCurrentServlet?page=" + page + "'"); } else { response.setHeader("refresh", "0;url='pageCurrentServlet?page=" + page + "'"); } } /** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */ public void init() throws ServletException { // Put your code here } }