java web 增加数据的问题 - Java / Web 开发

<%@page contentType="text/html;charset=gb2312" %>
<%@page language="java" import="java.sql.*" %>
<%@ page import="java.util.Date"%>
<%Date myDate = new Date();%> 
<%
  //如果session过期或者非法进入
  String sRealID = (String)session.getAttribute("username");
  if( sRealID==null || sRealID.equals("") )
  {
  return;
  }
 %>
 <% 
  String sname, stxt,ssty,smag;
  sname=request.getParameter("name");
  sname=sname.replaceAll("'","''");
  stxt=request.getParameter("txt");
  stxt=stxt.replaceAll("'","''");
  ssty=request.getParameter("sty");
  ssty=ssty.replaceAll("'","''");
  smag=request.getParameter("mag");
  smag=smag.replaceAll("'","''");
  String styp="select BkTy from atype where TyNa='"+ssty+"'";
  Connection conn=null;
  Statement stmt1=null;
  ResultSet rs1 =null;
  int bk=0;
  Statement stmt=null;
  // ResultSet rs =null;
   
   
  try
  {
&nb