中文乱码问题

<%@ page session="true" %>
<%@ page contentType="text/html; charset=gb2312"%>
<%@ include file="verify.jsp" %>
<%@ include file="../share/connection.jsp" %>
<%@ include file="../share/chek.jsp" %>
<html>
<head>
<title>?????</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<%
String adminpassword=request.getParameter("adminpassword");
String readminpassword=request.getParameter("readminpassword");
String adminname=request.getParameter("adminname");
if(adminname==null ||adminname.length()==0)
{
out.print("???????");
return;
}
if(adminpassword==null ||adminpassword.length()==0)
{
out.print("??????");
return;
}if(!adminpassword.equals(readminpassword))
{
out.print("??????????");
return;
}
String sqlPass="insert into cs_admin(admin_name,) "
+"values('"+adminname+"','"+adminpassword+"')";
if(stm.executeUpdate(sqlPass)==1)
{
out.print("???????");}
else
{
out.print("???");
}
%></body>
</html>请大虾帮小弟看看怎么解决？