(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>