Jsp getAttribute getAttributeNames

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<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <form name="form1" action="register" method="post">        用户名<input type="text" name="uname">        密码<input type="password" name="pwd">         城市:<select name="city">            <optgroup label="城市">            <option value="北京">北京</option>            <option value="2">上海</option>            <option value="3">深圳</option>            <option value="4">广州</option>            <option value="5">西安</option>        </optgroup>        <input type="submit"  value="提交">    </form></body>    <%        request.setAttribute("flower", "蔷薇");        request.setAttribute("test1","test1");        request.setAttribute("test2","test2");        request.setAttribute("test3","test3");        request.setAttribute("test4","test4");        request.setAttribute("test5","test5");        java.util.Enumeration a=request.getAttributeNames();        while(a.hasMoreElements())        out.println(a.nextElement());        out.println(request.getAttribute("flower").toString()+"flower");//可以跨页面传递哦        out.println(request.getMethod()+"method");    %></html>
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