jsp令我惊讶的Hashtable，可以在不同用户间记住会话的值
Registe.jsp：
<form action="Registe_Deal.jsp" method="post" >
姓名：<input type="text" name="name" /><br/>
密码：<input type="password" name="password" /><br/>
<input type="submit" value="提交" />
</form>
Registe_Deal.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'Registe_Deal.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<!-- 声明函数，必须加上！jsp真是怪异 -->
<%!
Hashtable<String,String> hashtable = new Hashtable<String,String>();
public synchronized void putName(String s)
{
hashtable.put(s,s);
}
%>
<%
String strName = request.getParameter("name");
String strPassWord = request.getParameter("password");
if(null == strName || "" == strName.trim())
{
out.print("什么都不写是不可以的？");
}
else
{
byte[] b = strName.getBytes("ISO-8859-1");
strName = new String(b,"UTF-8");
//我在本地使用两个浏览器来测试，居然这段代码能正常工作，jsp的Hashtable真是够可以的
if(!hashtable.containsKey(strName))
{
putName(strName);
out.print("注册成功了！");
out.print("您注册的名字是：" + strName);
}
else
{
out.print("这个名字您已经注册过了！");
}
}
out.print("<br/><a href='Registe.jsp' >返回</a>");
%>
</body>
</html>
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