底层和业务层都已经写好了。
现在我用的servlet的方式把数据以请求转发的形式发送到jsp页面上。
我想要的操作:
页面定时可以 异步 调用servlet获取数据，然后在从servlet返回到原jsp页面。
如果查询出来的是新数据，则用jquery动态添加tr的方式，添加到table首部。
- Java code
package dao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.List;import util.DBManager;import entity.Information;public class InformationDao { private Connection con = null; private PreparedStatement pst = null; private ResultSet rs = null; // 查询当天所有gtalk报警信息 public List<Information> queryAll() { // 按方法所需拼写T-SQL语句 String sql = "SELECT gtalk_alarm.Game_Type,gtalk_alarm.`DATE`,gtalk_alarm.Alarm_Type,gtalk_alarm.IP,gtalk_alarm.Srv_ID,gtalk_alarm.Srv_Name,gtalk_alarm.Alarm_Message,gtalk_alarm.Contact,gtalk_alarm.Tel " + "FROM gtalk_alarm " + "WHERE TO_DAYS(gtalk_alarm.`DATE`) = TO_DAYS(now()) " + "GROUP BY gtalk_alarm.Game_Type,gtalk_alarm.`DATE`,gtalk_alarm.Alarm_Type,gtalk_alarm.IP,gtalk_alarm.Srv_ID,gtalk_alarm.Srv_Name,gtalk_alarm.Alarm_Message,gtalk_alarm.Contact,gtalk_alarm.Tel " + "ORDER BY gtalk_alarm.`DATE` DESC"; // 创建数据库连接 con = DBManager.getConnection(); try { // 创建数据库操作对象 pst = con.prepareStatement(sql); // 执行数据库操作对象并接受结果集 rs = pst.executeQuery(); // 创建集合 List<Information> infoList = new ArrayList<Information>(); // 遍历结果集 while(rs.next()){ // 实例化信息对象 Information info = new Information(); info.setGameType(rs.getString("gtalk_alarm.Game_Type")); info.setDate(rs.getString("gtalk_alarm.DATE")); info.setAlarmType(rs.getString("gtalk_alarm.Alarm_Type")); info.setIp(rs.getString("gtalk_alarm.IP")); info.setSrv_id(rs.getString("gtalk_alarm.Srv_ID")); info.setSrv_name(rs.getString("gtalk_alarm.Srv_Name")); info.setAlarmMessage(rs.getString("gtalk_alarm.Alarm_Message")); info.setContact(rs.getString("gtalk_alarm.Contact")); info.setTel(rs.getString("gtalk_alarm.Tel")); // 封装对象进集合 infoList.add(info); } return infoList; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); return null; } finally{ DBManager.close(con,pst,rs); } } // 按集合差值limit查询 public List<Information> queryAll(int limit){ // 按方法所需拼写T-SQL语句 String sql = "SELECT gtalk_alarm.Game_Type,gtalk_alarm.`DATE`,gtalk_alarm.Alarm_Type,gtalk_alarm.IP,gtalk_alarm.Srv_ID,gtalk_alarm.Srv_Name,gtalk_alarm.Alarm_Message,gtalk_alarm.Contact,gtalk_alarm.Tel " + "FROM gtalk_alarm " + "WHERE TO_DAYS(gtalk_alarm.`DATE`) = TO_DAYS(now()) " + "GROUP BY gtalk_alarm.Game_Type,gtalk_alarm.`DATE`,gtalk_alarm.Alarm_Type,gtalk_alarm.IP,gtalk_alarm.Srv_ID,gtalk_alarm.Srv_Name,gtalk_alarm.Alarm_Message,gtalk_alarm.Contact,gtalk_alarm.Tel " + "ORDER BY gtalk_alarm.`DATE` DESC limit"+limit; // 创建数据库连接 con = DBManager.getConnection(); try { // 创建数据库操作对象 pst = con.prepareStatement(sql); // 执行数据库操作对象并接受结果集 rs = pst.executeQuery(); // 创建集合 List<Information> infoList = new ArrayList<Information>(); // 遍历结果集 while(rs.next()){ // 实例化信息对象 Information info = new Information(); info.setGameType(rs.getString("gtalk_alarm.Game_Type")); info.setDate(rs.getString("gtalk_alarm.DATE")); info.setAlarmType(rs.getString("gtalk_alarm.Alarm_Type")); info.setIp(rs.getString("gtalk_alarm.IP")); info.setSrv_id(rs.getString("gtalk_alarm.Srv_ID")); info.setSrv_name(rs.getString("gtalk_alarm.Srv_Name")); info.setAlarmMessage(rs.getString("gtalk_alarm.Alarm_Message")); info.setContact(rs.getString("gtalk_alarm.Contact")); info.setTel(rs.getString("gtalk_alarm.Tel")); // 封装对象进集合 infoList.add(info); } return infoList; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); return null; } finally{ DBManager.close(con,pst,rs); } } }package servlet;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import service.InformationService;import entity.Information;public class InformationServlet extends HttpServlet { InformationService informationService = new InformationService(); List<Information> infoList = new ArrayList<Information>(); public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { infoList = informationService.getInformationList(); request.setAttribute("infoList", infoList); request.getRequestDispatcher("index.jsp").forward(request, response); }}