我在做jsp+servlet数据分页的时候，无法实现前后翻页，
下面是我的分层结构
jsp
[code="java"]
<%@page contentType="text/html;charset=gbk" %>
<%@page language="java" import="java.util.*" %>
<%@ include file="inc/cmnAuthenticate.jsp" %>
<%@page language="java" import="ch05.*" %>
<%
Vector vMails = null;
int totalPage=0;
int curPage=0;
int countPerPage=10;
int pageNumber=1;
Hashtable myValues = (Hashtable)session.getAttribute(CommonConst.VIEWID_INBOXLIST);
if ( myValues != null )
{
vMails = (Vector)myValues.get("mails");
if ( vMails == null )
{
vMails = new Vector();
}
if(myValues.get("totalPage")!=null){
totalPage=((Integer)myValues.get("totalPage")).intValue();
}
if(myValues.get("curPage")!=null){
curPage=((Integer)myValues.get("curPage")).intValue();
}
}
%>
收件箱
<br>
<%<br>
if ( session.getAttribute("errMsg") != null )<br>
{<br>
%><br>
var sErrMsg = "<%=session.getAttribute("errMsg")%>";<br>
<%<br>
}<br>
else<br>
{<br>
%><br>
var sErrMsg = "";<br>
<%<br>
}<br>
%><br>
<%@ include file="inc/cmnPagePart1.jsp" %>
| 你当前共有 封邮件。 | ||||||||||||
|
||||||||||||
<%@ include file="inc/cmnPagePart2.jsp" %>
[/code]
servlet
[code="java"]/*
- This product includes software developed by the
- Apache Software Foundation (http://www.apache.org/). */ package ch05.controller;
import java.io.*;
import java.util.Hashtable;
import javax.servlet.*;
import javax.servlet.http.*;
import ch05.*;
import ch05.module.*;
/**
- 针对收件箱页面的Servlet
- @author Administrator
-
@version 1.0
/
public class Inbox extends HttpServlet implements java.io.Serializable
{
/*- */ private static final long serialVersionUID = 1L;
public void doGet ( HttpServletRequest request,
HttpServletResponse response )
throws ServletException, IOException
{//设置提交表单的中文编码 request.setCharacterEncoding("GBK"); HttpSession mySession = request.getSession(true); //清空错误消息 mySession.setAttribute("errMsg",""); //是否非法进入本页面 if ( mySession.getAttribute("username") == null ) { response.sendRedirect("/ch05/login.jsp"); return; } //是否进入默认页面 if ( !request.getParameterNames().hasMoreElements() ) { //设置session中的页面值域 mySession.setAttribute(CommonConst.VIEWID_INBOXLIST, new Hashtable() ); //取得最新邮件 MInbox mInbox = new MInbox(); boolean bGetResult = mInbox.getNewestMail( mySession ); String sGotoPage = request.getParameter("gotoPageNo"); Hashtable myValues = (Hashtable)mySession.getAttribute(ch05.CommonConst.VIEWID_INBOXLIST); myValues.put( "curPage", new Integer(sGotoPage) ); mySession.setAttribute("curPage","inbox"); response.sendRedirect("/ch05/inbox.jsp"); return; } //得到用户输入信息 String sMailIndex = request.getParameter("mailIndex"); String sMailOption = request.getParameter("mailOption"); //如果用户是提交表单 if ( sMailIndex != null && sMailIndex.length() > 0 ) { //设置session中的详细页面值域 mySession.setAttribute(CommonConst.VIEWID_INBOXDETAIL, new Hashtable() ); //获得对应的邮件信息 MInbox mInbox = new MInbox(); boolean bGetResult = mInbox.getDetailMail( mySession, sMailIndex ); if ( bGetResult ) { response.sendRedirect("/ch05/inboxDetail.jsp"); } else { response.sendRedirect("/ch05/inbox.jsp"); } } //如果用户是从详细页面迁移过来的 else if ( sMailOption != null && sMailOption.length() > 0 ) { String sSender = request.getParameter("sender"); String sSendTime = request.getParameter("sendTime"); String sSubject = request.getParameter("subject"); String sContent = request.getParameter("content"); //删除邮件 if ( sMailOption.equals("delete") ) { MInbox mInbox = new MInbox(); boolean bDeleteResult = mInbox.deleteMail( mySession, sSender, sSendTime ); mInbox.getNewestMail( mySession ); response.sendRedirect("/ch05/inbox.jsp"); return; } //回复邮件 else if ( sMailOption.equals("reply") ) { //设置session中的写邮件页面值域 mySession.setAttribute(CommonConst.VIEWID_SENDBOXDETAIL, new Hashtable() ); MInbox mInbox = new MInbox(); boolean bReplyResult = mInbox.replyMail( mySession, sSender, sSubject, sContent ); mySession.setAttribute("curPage","composite"); response.sendRedirect("/ch05/composite.jsp"); return; } try { MInbox mInbox=new MInbox(); mInbox.gotoPage(request, response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } //如果用户非法进入这个页面 else { response.sendRedirect("/ch05/login.jsp"); }}
public void doPost ( HttpServletRequest request,
HttpServletResponse response )
throws ServletException, IOException
{
doGet( request, response );
}
}[/code]
数据库处理
[code="java"]/*
- This product includes software developed by the
- Apache Software Foundation (http://www.apache.org/). */ package ch05.module;
import java.sql.*;
import java.util.*;
import java.text.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.servlet.http.*;
import ch05.*;
/**
- 针对收件箱页面的后台处理类
- @author Administrator
-
@version 1.0
*/
public class MInbox
{
public boolean getNewestMail ( HttpSession mySession )
{
//设置用户信息用
Hashtable myValues = (Hashtable)mySession.getAttribute(CommonConst.VIEWID_INBOXLIST);String sHost = ""; String sUser = ""; String sPass = ""; //尝试查找用户邮箱设置 try { //载入SQLServer的JDBC驱动类 Class.forName(CommonConst.DB_DRIVER_CLASSNAME); //获得数据库连接 Connection conn = DriverManager.getConnection( CommonConst.DB_CONN_STRING ); Statement stmt = null; ResultSet rs = null; String sUsername = (String)mySession.getAttribute("username"); try { //设置数据库的rollback点 conn.setAutoCommit(false); //检查数据库中是否已经有该用户的邮箱设置 stmt = conn.createStatement(); //执行SQL语句 String sQuery = "select * from mail_setting where username='" + sUsername + "'"; rs = stmt.executeQuery( sQuery ); if (rs.next() ) { sHost = rs.getString(2); sUser = rs.getString(3); sPass = rs.getString(4); } else { mySession.setAttribute("errMsg","请首先进行邮箱设置！"); return false; } //尝试连接Pop3服务器 Properties props = System.getProperties(); Session session = Session.getDefaultInstance(props, null); //获得收件箱 Store store = session.getStore("pop3"); store.connect( sHost, sUser, sPass); //获得Folder，并按照只读打开 Folder folder = store.getFolder( "INBOX" ); folder.open( Folder.READ_WRITE ); //获得所有邮件，并依次获取内容 Message messages[] = folder.getMessages(); //往数据库中登录 for ( int i=0; i<messages.length; i++ ) { //只要不是html格式，大概没有乱码问题。。。 String sFrom = MailContent.getFrom( messages[i].getFrom()[0].toString() ); String sTo = MailContent.getFrom( messages[i].getRecipients( Message.RecipientType.TO )[0].toString() ); String sDate = (new SimpleDateFormat("yyyy/MM/dd HH:mm:ss")).format(messages[i].getSentDate()); String sSubject = messages[i].getSubject(); String sContent = ""; //如果纯文本邮件内容 if ( messages[i].getContent() instanceof String ) { sContent = (String) messages[i].getContent(); } //如果HTML格式邮件内容 else { sContent = ((MimeMultipart)messages[i].getContent()).getBodyPart(0).getContent().toString(); } //插入数据库 String sUpdateQuery = "insert into inbox values('" + sUsername + "', '" + sFrom + "', '" + sTo + "', '" + sDate + "', '" + sSubject + "', '" + sContent + "', '0') "; stmt.executeUpdate( sUpdateQuery ); } conn.commit(); conn.setAutoCommit(true); //删除服务器上的邮件 for ( int i=0; i<messages.length; i++ ) { messages[i].setFlag( Flags.Flag.DELETED, true ); } folder.close(true); store.close(); //重新获取数据库中的所有邮件，并表示在页面上 Vector vMails = new Vector(); sQuery = "select * from inbox where username='" + sUsername + "' order by send_time desc"; rs = stmt.executeQuery( sQuery ); while ( rs.next() ) { String sFrom = rs.getString(2); String sTo = rs.getString(3); String sDate = rs.getString(4); String sSubject = rs.getString(5); String sContent = rs.getString(6); String sReadFlg = rs.getString(7); MailContent mc = new MailContent(); mc.setSender(sFrom); mc.setReceiver(sTo); mc.setSendTime(sDate); mc.setSubject(sSubject); mc.setContent(sContent); mc.setReadFlg(sReadFlg); vMails.add( mc ); } myValues.put( "mails", vMails ); //计算总页数 int countPerPage=10; int totalMail=vMails.size(); int totalPage=0; if(totalMail%countPerPage==0){ totalPage=totalMail/countPerPage; } else{ totalPage=totalMail/countPerPage+1; } int curPage=0; myValues.put("curPage", new Integer(curPage)); myValues.put("totalPage", new Integer(totalPage)); } catch(Exception e) { e.printStackTrace(); mySession.setAttribute("errMsg","查找邮件时出现错误！"); return false; } finally { try { rs.close(); stmt.close(); }catch(Exception ex) { } } }catch(Exception ex) { ex.printStackTrace(); mySession.setAttribute("errMsg","查找邮件时出现错误！"); return false; } return true;}
}
}[/code]
js
[code="java"]window.onload = windowLoad;
//---------------------------------
//页面载入时调用
function windowLoad()
{
cmnWindowLoad();
}
//查看具体邮件
function gotoMail( index )
{
form_main.mailIndex.value = index;
form_main.submit();
}
//前后翻页
function gotoPagePosition( gotoCount )
{
form_main.pageId.value = "goto";
form_main.gotoPageNo.value = gotoCount;
form_main.submit();
}[/code]
