求助：关于java.lang.NumberFormatException: For input string: "NaN"
我最近在学习Ajax，自己写了一个分页查找的例子，不过在Run的时候有个Bug，纠结了一天了，请坛子里的朋友帮我看看。
这个是 PageUtil
package Util;import dao.ArchiveDAO;public class PageUtil { private int pageSize;//页面大小(每页显示的条目数) private int pageId;//当前页码Id private int pageTotal;//记录总数 private int pageNum;//记录总页数 /** * 构造方法，用于计算总页数 */ public PageUtil() { super(); this.pageTotal = new ArchiveDAO().getTotals(); } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getPageId() { return pageId; } public void setPageId(int pageId) { this.pageId = pageId; } public int getPageTotal() { return pageTotal; } /** * 计算总页数 * @param pagesize * @return */ public int getPageNum(int pageSize) { if (pageTotal < pageSize) { pageNum = 1; } else if (pageTotal % pageSize == 0) { pageNum = pageTotal / pageSize; } else { pageNum = pageTotal / pageSize + 1; } return pageNum; }}package dao;import java.sql.*;import java.util.ArrayList;import java.util.List;import entity.Archive;import Util.DBUtil;import Util.PageUtil;public class ArchiveDAO { private static final String FIND_TOTAL = "select * from d_archive"; private static final String FIND_ALL = "select * from d_archive limit ?,?"; /** * 获取记录总数 * @return */ public int getTotals() { int pageTotal = 0; try { Connection conn = DBUtil.getConnection(); PreparedStatement prep = conn.prepareStatement(FIND_TOTAL); ResultSet res = prep.executeQuery(); while (res.next()) { pageTotal++; } } catch (Exception e) { e.printStackTrace(); } return pageTotal; } /** * 查询当前页的条目 * @param page 当前页码 * @return */ public List<Archive> getPage(PageUtil page) { int pageId = page.getPageId();//当前页码 int pageSize = page.getPageSize();//页面大小 //int pageNum = page.getPageNum(pageSize);//页码总数 //int pageTotal = page.getPageTotal();//总条目数 List<Archive> list = new ArrayList<Archive>(); try { Connection conn = DBUtil.getConnection(); PreparedStatement prep = conn.prepareStatement(FIND_ALL); int begin = (pageId - 1) * pageSize; prep.setInt(1, begin);//开始索引位置 prep.setInt(2, pageSize);//索引条目数 ResultSet res = prep.executeQuery(); while (res.next()) { Archive archive = new Archive(); archive.setId(res.getInt("id")); archive.setDocMgrName(res.getString("document_manager_name")); archive.setDepartmentName(res.getString("department_name")); archive.setCatchNum(res.getInt("catch_number")); archive.setArchiveNum(res.getInt("archive_number")); archive.setLastOpeTime(res.getString("last_operate_time")); list.add(archive); } } catch (Exception e) { e.printStackTrace(); } return list; }}package action;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 dao.ArchiveDAO;import entity.Archive;import Util.PageUtil;@SuppressWarnings("serial")public class ArchiveServlet extends HttpServlet { /** * doGet 请求方法 */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置请求页面编码 response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); //获得Action请求 String action = request.getParameter("action"); if (action == null) { return; } else if ("select".equalsIgnoreCase(action)) { select(request, response); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } /** * 获取当前页面的请求 */ public void select(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取当前页码 String pageIdNow = request.getParameter("pageId"); int pageId = Integer.parseInt(pageIdNow); System.out.println(pageId); //获取当前页面大小 String pageSizeNow = request.getParameter("pageSize"); int pageSize = Integer.parseInt(pageSizeNow); PageUtil page = new PageUtil(); page.setPageId(pageId); page.setPageSize(pageSize); toView(page, request, response); } /** * 获得数据，构造静态 HTML */ public void toView(PageUtil page, HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException { ArchiveDAO arcDAO = new ArchiveDAO(); List<Archive> list = arcDAO.getPage(page); PrintWriter out = response.getWriter(); if (list == null) { System.out.println("没有查询到数据..."); return; } else { out.println("<table>"); out.println("<tr>"); out.println("<td>档案员名称</td>"); out.println("<td>部门名称</td>"); out.println("<td>捕获数量</td>"); out.println("<td>归档数量</td>"); out.println("<td>最后操作时间<td>"); out.println("</tr>"); for (int i=0; i<list.size(); i++) { Archive archive = new Archive(); archive = (Archive)list.get(i); System.out.println(archive.getDocMgrName()); out.println("<tr>"); out.println("<td>" + archive.getDocMgrName() + "</td>"); out.println("<td>" + archive.getDepartmentName() + "</td>"); out.println("<td>" + archive.getCatchNum() + "</td>"); out.println("<td>" + archive.getArchiveNum() + "</td>"); out.println("<td>" + archive.getLastOpeTime() + "</td>"); out.println("</tr>"); } out.println("</table>"); } out.println("<div>"); out.println("共<input type='text' value='" + arcDAO.getTotals() + "' size='1' readonly='true' >条记录"); out.println("共<input type='text' value='" + page.getPageNum(page.getPageSize()) + "' size='1' readonly='true' >页"); out.println("当前显示<input type='text' value='" + page.getPageSize() + "' size='1' id='pageSize' onchange=changePage()>条"); if (page.getPageSize() < page.getPageTotal()) { out.println("第<input type='text' value='" + page.getPageId() + "' size='1' id='pageId' readonly='true'>页"); if (page.getPageId() == 1) { out.println("<input type='button' value='上一页' disabled='true'>"); if (page.getPageId() != page.getPageNum(page.getPageSize())) { out.println("<input type='button' value='下一页' onclick='nextPage(" + page.getPageId() +")'>"); System.out.println(page.getPageId()); } else { out.println("<input type='button' value='下一页' disable='true'>"); } } else { out.println("<input type='button' value='上一页' onclick='pevPage(" + page.getPageId() + ")'>"); if (page.getPageId() != page.getPageNum(page.getPageSize())) { out.println("<input type='button' value='下一页' onclick='nextPage(" + page.getPageId() +")'>"); } else { out.println("<input type='button' value='下一页' disable='true'>"); } } } else { out.println("第<input type='text' value='1' size='1' id='pageId' readonly='true'>页"); out.println("<input type='button' value='上一页' disabled='true'>"); out.println("<input type='button' value='下一页' disabled='true'>"); } out.println("</div>"); }}
package entity;public class Archive { private int id; private String docMgrName;//管理员姓名 private String departmentName;//所属部门 private int catchNum;//缓存数 private int archiveNum;//归档文件数 private String lastOpeTime;//最后操作时间 public int getId() { return id; } public void setId(int id) { this.id = id; } public String getDocMgrName() { return docMgrName; } public void setDocMgrName(String docMgrName) { this.docMgrName = docMgrName; } public String getDepartmentName() { return departmentName; } public void setDepartmentName(String departmentName) { this.departmentName = departmentName; } public int getCatchNum() { return catchNum; } public void setCatchNum(int catchNum) { this.catchNum = catchNum; } public int getArchiveNum() { return archiveNum; } public void setArchiveNum(int archiveNum) { this.archiveNum = archiveNum; } public String getLastOpeTime() { return lastOpeTime; } public void setLastOpeTime(String lastOpeTime) { this.lastOpeTime = lastOpeTime; } public String toString() { return "Archive [archiveNum=" + archiveNum + ", catchNum=" + catchNum + ", departmentName=" + departmentName + ", docMgrName=" + docMgrName + ", id=" + id + ", lastOpeTime=" + lastOpeTime + "]"; }}