为什么不执行呀只是将代码完全显示在页面中

<%@ page language="java" import="java.util.Date,java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<script type="text/javascript">
function dis_alert()
{ alert("Bank code or password is error!")}
</script>
</head>
<%
String code=request.getParameter("code");
String password=request.getParameter("password");
String money=request.getParameter("money"); 
String cod=(String)session.getAttribute("co");
String psw=(String)session.getAttribute("pwd");
if(cod==null||psw==null) response.sendRedirect("logincheck.html");
else {
try{Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/ATM","root","root");
Statement stmt=conn.createStatement();
String sql="select * from atm where code='"+code+"' and password='"+password+"'";
ResultSet rs=stmt.executeQuery(sql);
if(rs.next()){ 
String freeze=rs.getString("freeze");
String ReportLoss=rs.getString("ReportLoss");
String fr="yes";
String rl="yes";
if(fr.equals(freeze))
response.sendRedirect("public1.html");
else{ 
if(rl.equals(ReportLoss))
response.sendRedirect("public2.html");
else
response.sendRedirect("ordinary_1.jsp?code="+code+"&money="+money+"");}}
//response.sendRedirect("error.jsp?abc="+x+"&参数="+变量+"&参数="+变量+"&参数="+变量....);response 传递参数 
else {
rs.close();
stmt.close();
conn.close();}}
catch(Exception e){out.print(e);}
%> 
<body>
<center>
<input value="Displays a message box" onclick="dis_alert()" type="button"/>
<a href="ordinary.html">Resume load</a>
</center>
</body>
<%
}
%>
</html>JSP