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jsp-JSP代碼運行報錯，cant be resolved

編輯：編程綜合問答

JSP代碼運行報錯，can't be resolved

這是我的代碼：

<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.util.*"%>
<HTML><BODY>
<%! Vector v=new Vector();
ServletContext application;
synchronized void sendMessage(String s){
    application=getServletContext();
    v.add(s);
    application.setAttribute("Mess",v);
}
%>
<% String name=request.getParameter("peopleName");
   String title=request.getParameter("Title");
   String messages=request.getParameter("messages");
   if(name==null){
      name="guest"+(int)(Math.random()*10000);
   }
   if(title==null){
      title="無標題";
   }
   if(messages==null){
      messages="無信息";
   String time=new Date().toString();
   String s="#"+name+"#"+title+"#"+time+"#"+messages+"#";
   sendMessage(s);
   out.print("您的信息已經提交！");
%>
<A href="submit.jsp">返回
<A href="showMessage,jsp">查看留言板
</BODY></HTML>

在浏覽器中用localhost:8080打開後報錯，雖然有錯誤提示，但我不太清楚該怎麼改，以下是錯誤信息：

 An error occurred at line: 4 in the jsp file: /messagePane.jsp
Vector cannot be resolved to a type
1: <%@ page contentType="text/html;charset=GB2312" %>
2: <%@ page import="java.ytil.*"%>
3: <HTML><BODY>
4: <%! Vector v=new Vector();
5: ServletContext application;
6: synchronized void sendMessage(String s){
7:     application=getServletContext();

 An error occurred at line: 8 in the jsp file: /messagePane.jsp
v cannot be resolved

An error occurred at line: 9 in the jsp file: /messagePane.jsp
v cannot be resolved to a variable

5: ServletContext application;
6: synchronized void sendMessage(String s){
7:     application=getServletContext();
8:     v.add(s);
9:     application.setAttribute("Mess",v);
10: }
11: %>

 An error occurred at line: 23 in the jsp file: /messagePane.jsp
Date cannot be resolved to a type
20:    }
21:    if(messages==null){
22:       messages="無信息";
23:    String time=new Date().toString();
24:    String s="#"+name+"#"+title+"#"+time+"#"+messages+"#";
25:    sendMessage(s);
26:    out.print("您的信息已經提交！");

感覺從語法上並沒有什麼錯，錯誤提示也都是can't be resolved，到底是哪裡出了問題呢？