???(1) 使用綠色版本JDK，解壓到一個目錄上D:\jdk1.6。
?? (2) 使用綠色版本Tomcat，解壓到另一個目錄上D:\jdk1.6\tomcat5.5

??? 只要在bat文件D:\tomcat5.5\bin\catalina.bat，
??? 配置JAVA_HOME就可運行了。
??? 增加：set JAVA_HOME="D:\jdk1.6"，這樣就可以運行了。

測試tomcat，訪問:?? http://127.0.0.1:8080/ ,能打開訪問的頁面即可.

用一個簡單的投票系統。 http://127.0.0.1:8080/vote/
投票系統 (請不要下載,已經加密)

其中,有一個管理界面的mainform.jsp上有一個按鈕,修改數據,所鏈接的是isvisable.jsp, 點擊修改后,又返回mainform.jsp.
問題是: 不能刷新mainform.jsp,它還是顯示原來的數據.

故我用了一個簡單的解決方案:
???????? 在mainform.jsp上,禁止緩存,
如下:
<%response.setHeader("Cache-Control","no-store");%>
<%response.setHeader("Pragma","no-cache");%>
<%response.setDateHeader("Expires",0);%>

<head>
<META?? HTTP-EQUIV="pragma"?? CONTENT="no-cache">???
<META?? HTTP-EQUIV="Cache-Control"?? CONTENT="no-cache,?? must-revalidate">???
<META?? HTTP-EQUIV="expires"?? CONTENT="Mon,?? 23?? Jan?? 1978?? 20:52:30?? GMT">??
</head>

在isvisable.jsp中,

<%
?int questionid;
?int isvisable;
?questionid = Integer.parseInt(request.getParameter("questionid"));
?out.print(questionid);
?sql = "SELECT IsVisable from Questions where QuestionID ="+questionid;
?rs = smt.executeQuery(sql);
?out.println(rs);

?while(rs.next())
? {
?? isvisable = rs.getInt(1);
?? out.println(isvisable);
?? if(isvisable==1)
?? {
???? Statement smttmp?? =?? con.createStatement();?
???? sql = "update Questions set IsVisable = 0 ,IsOpen = 0 ,IsOpenDetial = 0 where QuestionID = "+questionid;
???? smttmp.executeUpdate(sql);
???? //response.sendRedirect("mainform.jsp"); //去掉,不能直接返回,因更新數據庫,需要時間
?? }
?? else if(isvisable==0)
?? {
???? Statement smttmp?? =?? con.createStatement();?
???? sql = "update Questions set IsVisable = 1 ,IsOpen = 0 ,IsOpenDetial = 0 where QuestionID = "+questionid;
???? smttmp.executeUpdate(sql);
???? //response.sendRedirect("mainform.jsp"); //去掉,不能直接返回,因更新數據庫,需要時間.
?? }

? }
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">?
<meta http-equiv="Refresh"?content="1;url= mainform.jsp"> //等待1秒后,自動刷新到主頁面.
<title>
isvisable
</title>
</head>

</html>


有沒有好的方法呢?

原來只要正常的關閉連接就可以了,感覺是不是這樣就提交了,特別是要關閉connection,
問題解決了,看來還是要根據規范編寫程序才行,打開的鏈接,一定要關閉.

<%
?int questionid;
?int isvisable;
?questionid = Integer.parseInt(request.getParameter("questionid"));
?out.print(questionid);
?sql = "SELECT IsVisable from Questions where QuestionID ="+questionid;
?rs = smt.executeQuery(sql);
?out.println(rs);

?while(rs.next())
? {
?? isvisable = rs.getInt(1);
?? out.println(isvisable);
?? if(isvisable==1)
?? {
???? Statement smttmp?? =?? con.createStatement();?
???? sql = "update Questions set IsVisable = 0 ,IsOpen = 0 ,IsOpenDetial = 0 where QuestionID = "+questionid;
???? smttmp.executeUpdate(sql);
???? if(smttmp != null)
???? {
???? smttmp.close();
???? }
???? response.sendRedirect("mainform.jsp");
?? }
?? else if(isvisable==0)
?? {
???? Statement smttmp?? =?? con.createStatement();?
???? sql = "update Questions set IsVisable = 1 ,IsOpen = 0 ,IsOpenDetial = 0 where QuestionID = "+questionid;
???? smttmp.executeUpdate(sql);
???? if(smttmp != null)
???? {
???? smttmp.close();
???? }
???? response.sendRedirect("mainform.jsp");;
?? }

? }

???? if(con != null)
???? {
???? con.close();
???? }
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">?
<title>
isvisable
</title>
</head>

</html>