代码显示不能从外部返回文件，要怎么改

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%@ include file="Theme01.jsp" %>
/jsp:useBean
<%
// 获取登录的用户名
String userName = (String)request.getSession().getAttribute("userName");
//原金额
double priBalance = Double.parseDouble((String)session.getAttribute("balance"));
if((request.getParameter("money")).equals("")) {%>
<br> alert(&quot;请输入存入金额！&quot;);<br>
<%}else{
try{
//存入金额
double depMoney = Double.parseDouble(request.getParameter("money"));
//总金额
double totalMoney = priBalance + depMoney;
//执行插入语句
Conn.AlterSql("UPDATE Users SET balance= " + totalMoney + "WHERE name= " + "'" + userName + "'");%>
<br> alert(&quot;存款成功&quot;);<br> return;<br>
<%
}catch(Exception e) {
System.out.println(e.toString());
}
}
%>

<td align="center">
        <input type="button" name="goback" value="返回" onClick="javascript:window.history.go(-1)" >
</td>

<%@ include file="Theme02.jsp" %>

使用history.go的返回的话，必须是同一个域名跳转到这个界面的