我的这个代码取不到数据 而且回来的页面全是问号 怎么回事！！！
Java code<%@ page language="java" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>" /> <meta http-equiv="content-type" content="text/html; charset=utf8"> <link rel="stylesheet" type="text/css" href="css/manageRecord.css"> <script language="javascript" src="js/calendar.js"></script> </head> <body> <form action="ManageRecord.do" method="post"> <div class="all"> <span class="title">聊天记录管理</span> <div class="content"> 选择客服： <input type="text" name="chatId"> <br> 对话时间： <input type="text" name="time1" id="time1" onclick="MyCalendar.SetDate(this)" /> 至 <input type="text" name="time1" id="time2" onclick="MyCalendar.SetDate(this)"> <br /> <input type="submit" value="查询" style="margin-top: 15px;"> </div> <div class="count"> <div id="c1"> <table width="800" border="1"> <tr> <th> 客服名称 </th> <th> 聊天内容 </th> <th> 聊天日期 </th> </tr> <tbody> <c:forEach items="${chatRecords}" var="chatRecord"> <tr> <td> ${chatRecord.serverName } </td> <td> ${chatRecord.chatContent } </td> <td> ${chatRecord.chatCreateTime } </td> </tr> </c:forEach> </tbody> </table> </div> <div class="c2"> <input type="checkbox" /> 全选 <input type="button" value="删除" /> </div> </div> </div> </form> </body></html>package servlet;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import entity.ChatRecord;import bo.ChatRecordBo;public class ManageRecord extends HttpServlet { private static final long serialVersionUID = -8402572450669973831L; private ChatRecordBo chatRecordBo = ChatRecordBo.getInstance(); public ManageRecord() { super(); } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/plain"); int chatId = Integer.parseInt(request.getParameter("chatId")); String time1 = request.getParameter("time1"); String time2 = request.getParameter("time2"); List<ChatRecord> chatRecords = chatRecordBo.getRecords(chatId, time1, time2); response.getWriter().print(chatRecords); if (chatRecords != null) { request.setAttribute("list", chatRecords); request.getRequestDispatcher("/adminFunction/manageRecord.jsp") .forward(request, response); } else { response.sendRedirect("/index.jsp"); } } public void init() throws ServletException { }}package dao;import java.sql.Connection;import java.util.Date;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.List;import db.DBConnection;import entity.ChatRecord;public class ChatRecordDao { private ChatRecordDao() { } private static ChatRecordDao instance; public static ChatRecordDao getInstance() { if (instance == null) { instance = new ChatRecordDao(); } return instance; } public List<ChatRecord> getChatRecords(int chatId, String chatCreateTime1, String chatCreateTime2) { ArrayList<ChatRecord> chatRecords = new ArrayList<ChatRecord>(); String sql = "select * from chatRecord where chatId = ? and chatCreateTime between ? and ?"; Connection conn = DBConnection.getConn(); PreparedStatement pstmt = null; ResultSet rs = null; try { pstmt = conn.prepareStatement(sql); pstmt.setInt(1, chatId); pstmt.setString(2, chatCreateTime1); pstmt.setString(3, chatCreateTime2); rs = pstmt.executeQuery(); while (rs.next()) { ChatRecord chatRecord = new ChatRecord(); chatRecord.setChatId(rs.getInt(1)); chatRecord.setServerName(rs.getString(2)); chatRecord.setChatContent(rs.getString(3)); chatRecord.setChatCreateTime(rs.getDate(4)); chatRecords.add(chatRecord); } } catch (SQLException e) { e.printStackTrace(); } finally { DBConnection.closeAll(rs, pstmt, conn); } return chatRecords; }}