如何获取并理解ASP网站留言板的源代码？
<%@ Language="VBScript" %>
<!DOCTYPE html>
<html>
<head>
<title>留言板</title>
<style>
table {
width: 50%;
border-collapse: collapse;
}
table, th, td {
border: 1px solid black;
}
th, td {
padding: 8px;
text-align: left;
}
th {
background-color: #f2f2f2;
}
</style>
</head>
<body>
<h2>留言板</h2>
<form action="messages.asp" method="post">
<label for="name">姓名:</label><br>
<input type="text" id="name" name="name"><br>
<label for="email">电子邮件:</label><br>
<input type="text" id="email" name="email"><br>
<label for="message">留言:</label><br>
<textarea id="message" name="message"></textarea><br>
<input type="submit" value="提交">
</form>
<%
If Request.ServerVariables("REQUEST_METHOD") = "POST" Then
Dim name, email, message
name = Request.Form("name")
email = Request.Form("email")
message = Request.Form("message")
If name <> "" And email <> "" And message <> "" Then
' 将留言保存到文件或数据库中（此处仅演示写入文件）
Dim fso, file
Set fso = CreateObject("Scripting.FileSystemObject")
Set file = fso.OpenTextFile("messages.txt", 8, True)
file.WriteLine("姓名: " & name & " | 电子邮件: " & email & " | 留言: " & message)
file.Close
Set file = Nothing
Set fso = Nothing
Response.Write("<p>留言已成功提交！</p>")
Else
Response.Write("<p>所有字段都是必填的。</p>")
End If
End If
%>
<h3>留言列表</h3>
<table>
<tr>
<th>姓名</th>
<th>电子邮件</th>
<th>留言</th>
</tr>
<%
Dim fso, file, content, lines, lineCount
Set fso = CreateObject("Scripting.FileSystemObject")
If fso.FileExists("messages.txt") Then
Set file = fso.OpenTextFile("messages.txt", 1)
content = file.ReadAll
file.Close
Set file = Nothing
Set file = fso.OpenTextFile(content)
lines = Split(file.ReadAll, vbCrLf)
lineCount = UBound(lines) + 1
For i = 0 To lineCount 1
If lines(i) <> "" Then
Response.Write("<tr>")
Response.Write("<td>")
Response.Write(Left(lines(i), InStr(lines(i), "|") 1)) ' 输出姓名
Response.Write("</td>")
Response.Write("<td>")
Response.Write(Mid(lines(i), InStr(lines(i), "|") + 2, InStrRev(lines(i), "|") InStr(lines(i), "|") 2)) ' 输出电子邮件
Response.Write("</td>")
Response.Write("<td>")
Response.Write(Mid(lines(i), InStrRev(lines(i), "|") + 2)) ' 输出留言内容
Response.Write("</td>")
Response.Write("</tr>")
End If
Next
End If
Set file = Nothing
Set fso = Nothing
%>
</table>
</body>
</html>FAQs:
Q1: 我如何修改这个留言板以使用数据库而不是文件来存储数据？
A1: 要使用数据库代替文件存储数据，你需要首先设置一个数据库（例如SQL Server、MySQL等），然后修改代码以连接和操作该数据库，以下是一个使用MySQL数据库的简单示例：
1、在MySQL中创建一个名为guestbook的数据库和一个名为messages的表：
CREATE DATABASE guestbook;
USE guestbook;
CREATE TABLE messages (
id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(255),
email VARCHAR(255),
message TEXT,
date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);2、更新ASP代码以连接到MySQL数据库并执行插入和查询操作：
<%@ Language="VBScript" %>
<!DOCTYPE html>
<html>
<head>
<title>留言板</title>
<style>
...
</style>
</head>
<body>
...
<%
If Request.ServerVariables("REQUEST_METHOD") = "POST" Then
Dim name, email, message, connString, conn, rs, sql
name = Request.Form("name")
email = Request.Form("email")
message = Request.Form("message")
connString = "DRIVER={MySQL ODBC 8.0 Unicode Driver};SERVER=localhost;DATABASE=guestbook;UID=root;PWD=yourpassword;"
Set conn = Server.CreateObject("ADODB.Connection")
conn.Open connString
sql = "INSERT INTO messages (name, email, message) VALUES (?, ?, ?)"
Set rs = Server.CreateObject("ADODB.Recordset")
rs.Open sql, conn, adCmdText Or adExecuteInsert, , adParamInput
rs("name").Value = name
rs("email").Value = email
rs("message").Value = message
rs.Update
rs.Close()
Set rs = Nothing
conn.Close()
Set conn = Nothing
Response.Write("<p>留言已成功提交！</p>")
End If
%>
...
<%
Dim connString, conn, rs, sql
connString = "DRIVER={MySQL ODBC 8.0 Unicode Driver};SERVER=localhost;DATABASE=guestbook;UID=root;PWD=yourpassword;"
Set conn = Server.CreateObject("ADODB.Connection")
conn.Open connString
sql = "SELECT * FROM messages ORDER BY id DESC"
Set rs = Server.CreateObject("ADODB.Recordset")
rs.Open sql, conn, adOpenStatic, adLockReadOnly, adCmdText
Do While Not rs.EOF
Response.Write("<tr>")
Response.Write("<td>")
Response.Write(rs("name"))
Response.Write("</td>")
Response.Write("<td>")
Response.Write(rs("email"))
Response.Write("</td>")
Response.Write("<td>")
Response.Write(rs("message"))
Response.Write("</td>")
Response.Write("</tr>")
rs.MoveNext()
Loop
rs.Close()
Set rs = Nothing
conn.Close()
Set conn = Nothing
%>
...
</body>
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