2021040410-review01.rar

package com.yzzy.servlet; import java.io.IOException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.yzzy.dao.MessageDao; import com.yzzy.pojo.Message; import com.yzzy.service.MessageService; /** * Servlet implementation class MessageServlet */ @WebServlet("/messageServlet") public class MessageServlet extends HttpServlet { private static final long serialVersionUID = 1L; private MessageService messageService = new MessageService(); /** * @see HttpServlet#HttpServlet() */ public MessageServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub // System.out.println("访问到了messageServlet"); //取出method参数，判断是做什么方法操作 String method = request.getParameter("method"); if ("findAll".equals(method)) { findAll(request,response); }else if ("findById".equals(method)) { findById(request,response); }else if ("deleteByIds".equals(method)) { deleteByIds(request,response); } } private void deleteByIds(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String[] ids = request.getParameterValues("checkboxs"); boolean flag = messageService.deleteByIds(ids); if (flag) { request.getRequestDispatcher("manageLeaveword.jsp").forward(request, response); } } private void findById(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String id = request.getParameter("id"); Message message=messageService.findById(id); request.setAttribute("message", message); request.getRequestDispatcher("leavewordInfo.jsp").forward(request, response); } private void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub //从数据库中查询所有留言数据，将数据存储在作用域通信对象中，并返回manageLeaveword.jsp List<Message> messageList =messageService.findAll(); request.setAttribute("messageList", messageList); request.getRequestDispatcher("manageLeaveword.jsp").forward(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }