循环排版的问题,真苦恼啊,谁来帮帮我?????

<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<LINK href="picture/Style.css" rel=stylesheet />
<head>
<title>Print information</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<!--media=print 这个属性可以在打印时有效-->
<style media=print>
.Noprint{display:none;}
.PageNext{page-break-after: always;}
</style><style>
.tdp
{
    border-bottom: 1 solid #000000;
    border-left:  1 solid #000000;
    border-right:  0 solid #ffffff;
    border-top: 0 solid #ffffff;
}
.tabp
{
    border-color: #000000 #000000 #000000 #000000;
    border-style: solid;
    border-top-width: 2px;
    border-right-width: 2px;
    border-bottom-width: 1px;
    border-left-width: 1px;
}
.NOPRINT {
font-family: "宋体";
font-size: 9pt;
}</style></head><body >
<center class="Noprint" >
  <p align="left">
  <input name="button"  type=button  onclick=document.all.WebBrowser.ExecWB(7,1)  value=打印预览 />
  <OBJECT  id=WebBrowser  classid=CLSID:8856F961-340A-11D0-A96B-00C04FD705A2  height=0  width=0>
  </OBJECT>
  <input  type=button  value=页面设置  onclick=document.all.WebBrowser.ExecWB(8,1)>
</p>
  <p>    <br/>
  </p>
  
</center><table width="100%" border="0">
  <tr>
    <%! String post_num;%>
<%! String user_num;%>
<%! String address_num;%>
<%! String id_num;%>
<%! String where_code;%>
<%! int i;%>
<%
    try
    {
       
        request.setCharacterEncoding("gb2312");
        where_code=(String)request.getParameter("print_txt");
where_code=where_code.trim();
        //str2="jdbc:odbc:"+str1 
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
        Connection connect;
        connect=DriverManager.getConnection("jdbc:odbc:shanghaitoday","shtodaydb","s1n0db");
        Statement state1;
        
        state1=connect.createStatement();
        
       
                
        String strQuery1="select * from customer_table "+where_code+"";
        ResultSet result1=state1.executeQuery(strQuery1);
System.out.println(where_code);
System.out.println(strQuery1);

 while(result1.next())
         {   
    id_num=result1.getString("name_id");
 id_num=id_num.trim();
     user_num=result1.getString("name");
 user_num=user_num.trim();
 address_num=result1.getString("address");
 address_num=address_num.trim();
 post_num=result1.getString("post");
 post_num=post_num.trim();
 i++;
  if(i%4==0)
 {
  System.out.println(i);
   %><tr><%
 }

 
 %><td>
<table width="30%" border="1" cellpadding="0" cellspacing="0" bordercolorlight="#FFFFFF" bordercolordark="#000000">
 <tr>
      <td> 
    <table width="300" height="100" border="0">
        <tr >
          <td height="25">
            <div align="left">&nbsp;<%=post_num%></div></td>
        </tr>
        <tr>
          <td height="25"><div align="center"></div>
              <div align="center"><%=user_num%>&nbsp;(收)</div></td>
        </tr>
        <tr>
          <td height="25" valign="top"><div align="center"><%=address_num%></div></td>
        </tr>
        <tr>
          <td valign="top"><div align="right">编号:<%=id_num%>&nbsp;</div></td>
        </tr>
      </table>
 </td>
  </tr>
</table>
</td>
  <%
   if(i%4==0)
 {
  System.out.println(i);
   %></tr><%
 }
   

 
}
   
 
 connect.close();
        }
    catch(Exception e)
    {
        System.err.println("done exception"+e);
       
    
        
        }
        finally
{
System.out.println(post_num);
System.out.println(user_num);
System.out.println(address_num);
System.out.println(id_num);

  }
        %>

  </tr>
</table></body>
</html>
比如在数据库里的记录有6条,要求每行显示3个,我上面的代码在运行后,第一行是3个,但是到第二行就显示一个了,还有2个到第三行去了,这是怎么回事啊??????