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String admin = request.getParameter("user");
String pass = null;
int num = 0;
rs=stmt.executeQuery("select pass from admin where user="+user);
while(rs.next()){
    pass = rs.getString(1);
    num=1;
}
if(num == 1){
    response.sendRedirect("admin.jsp");
}else{
   response.sendRedirect("login.jsp");//Ìø×ªµ½×¢²áÒ³Ãæ
}
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