ASP中如何进行字符编码与解码操作？

ASP字符编码解码

ASP（Active Server Pages）是一种服务器端脚本语言，常用于Web开发，在处理字符串时，字符编码和解码是常见需求，本文将详细介绍ASP中字符编码与解码的方法。

一、ASP中的Escape编码与解码

1. Escape编码函数

EscapeCode函数用于对字符串进行Escape编码，将字符转换为符合JavaScriptunescape方法解码的格式，小于255的字符变为“%+其16进制ASCII码”的形式，大于255的字符变为“%u+其16进制Unicode码”的形式。

Function EscapeCode(p_Message)
    Dim m_char, m_asc, m_hex '字符，ASC码，16进
    For i = 1 To Len(p_Message)
        m_char = Mid(p_Message, i, 1)
        m_asc = AscW(m_char)
        If m_asc < 0 Then m_asc = m_asc + 65536
        If (m_asc And &HFF80) = 0 Then
            '单字节字符
            m_hex = Hex((m_asc \ 2 ^ 6)) Or &HC0
        ElseIf (m_asc And &HF000) = 0 Then
            '双字节字符
            m_hex = "%" & Hex((m_asc \ 2 ^ 6)) Or &HC0 & Hex(m_asc And &H3F Or &H80)
        Else
            '三字节字符
            m_hex = "%" & Hex((m_asc \ 2 ^ 12) Or &HE0) & "%" & _
                Hex((m_asc \ 2 ^ 6) And &H3F Or &H80) & "%" & _
                Hex(m_asc And &H3F Or &H80)
        End If
        EscapeCode = EscapeCode & m_hex
    Next
End Function

2. URLEncode与URLDecode函数

ASP内置了Server.URLEncode和Server.URLDecode函数，用于对字符串进行URL编码和解码。

URLEncode：将字符串转换为URL编码格式。

URLDecode：将URL编码格式的字符串解码回原始字符串。

' URLEncode示例
Response.Write(Server.URLEncode("Hello World!")) '输出: Hello+World%21
' URLDecode示例
dim encodedStr: encodedStr = "Hello+World%21"
dim decodedStr: decodedStr = Server.URLDecode(encodedStr)
Response.Write(decodedStr) '输出: Hello World!

二、UTF-8与GBK编码转换

1. UTF-8到GBK的转换

使用VBScript编写的函数可以将UTF-8编码转换为GBK编码，该函数遍历输入字符串，检查每个字符是否是UTF-8占位符百分号%，并将其转换为对应的GBK字符。

Function UTF2GB(UTFStr)
    Dim GBStr, i, v
    GBStr = ""
    For i = 1 To Len(UTFStr)
        c = Mid(UTFStr, i, 1)
        If c = "%" Then
            If Len(UTFStr) >= i + 8 Then
                v = ConvChinese(Mid(UTFStr, i + 1, 9))
                GBStr = GBStr & v
                i = i + 8
            Else
                v = ChrBin(Mid(UTFStr, i + 1, 2))
                GBStr = GBStr & v
                i = i + 2
            End If
        Else
            GBStr = GBStr & c
        End If
    Next
    UTF2GB = GBStr
End Function
Function ConvChinese(x)
    A = Split(Mid(x, 2), "%")
    i = 0
    j = 0
    For i = 0 To UBound(A)
        A(i) = C16to2(A(i))
    Next
    For i = 0 To UBound(A) 1
        DigS = InStr(A(i), "0")
        Unicode = ""
        For j = 1 To DigS 1
            If j = 1 Then
                A(i) = Right(A(i), Len(A(i)) DigS)
                Unicode = Unicode & A(i)
            Else
                i = i + 1
                A(i) = Right(A(i), Len(A(i)) 2)
                Unicode = Unicode & A(i)
            End If
        Next
        If Len(C2to16(Unicode)) = 4 Then
            ConvChinese = ConvChinese & ChrW(Int("&H" & C2to16(Unicode)))
        Else
            ConvChinese = ConvChinese & Chr(Int("&H" & C2to16(Unicode)))
        End If
    Next
End Function

2. GBK到UTF-8的转换

同样地，可以使用VBScript编写的函数将GBK编码转换为UTF-8编码，该函数遍历输入字符串，检查每个字符是否为GBK编码，并将其转换为相应的UTF-8字符。

Function GBtoUTF8(GBStr)
    Dim UTFStr, i, v
    UTFStr = ""
    For i = 1 To Len(GBStr)
        c = Mid(GBStr, i, 1)
        If c <>h Then
            v = ChrW(AscW(c))
            UTFStr = UTFStr & v
        ElseIf c <>h Then
            v = ChrW((AscW(c) &H20) * &H400 + AscW(Mid(GBStr, i + 1, 1)))
            UTFStr = UTFStr & v
            i = i + 1
        ElseIf c <>h Then
            v = ChrW((AscW(c) &H80) * &H400 + AscW(Mid(GBStr, i + 1, 1)))
            UTFStr = UTFStr & v
            i = i + 1
        ElseIf c <>h Then
            v = ChrW((AscW(c) &HF800) * &H400 + AscW(Mid(GBStr, i + 1, 1)) * &H400 + AscW(Mid(GBStr, i + 2, 1)))
            UTFStr = UTFStr & v
            i = i + 2
        End If
    Next
    GBtoUTF8 = UTFStr
End Function

相关问题与解答

问题1: 如何在ASP中实现JavaScript的Escape编码？

答案: 在ASP中实现JavaScript的Escape编码可以使用自定义的EscapeCode函数，具体实现如下：

Function EscapeCode(p_Message)
    Dim m_char, m_asc, m_hex '字符，ASC码，16进
    For i = 1 To Len(p_Message)
        m_char = Mid(p_Message, i, 1)
        m_asc = AscW(m_char)
        If m_asc < 0 Then m_asc = m_asc + 65536
        If (m_asc And &HFF80) = 0 Then
            '单字节字符
            m_hex = Hex((m_asc \ 2 ^ 6)) Or &HC0
        ElseIf (m_asc And &HF000) = 0 Then
            '双字节字符
            m_hex = "%" & Hex((m_asc \ 2 ^ 6)) Or &HC0 & Hex(m_asc And &H3F Or &H80)
        Else
            '三字节字符
            m_hex = "%" & Hex((m_asc \ 2 ^ 12) Or &HE0) & "%" & _
                Hex((m_asc \ 2 ^ 6) And &H3F Or &H80) & "%" & _
                Hex(m_asc And &H3F Or &H80)
        End If
        EscapeCode = EscapeCode & m_hex
    Next
End Function

这个函数会将字符串中的每个字符根据其ASCII或Unicode值转换为对应的Escape编码格式。

问题2: 如何在ASP中进行UTF-8与GBK之间的编码转换？

答案: 在ASP中进行UTF-8与GBK之间的编码转换可以通过自定义的转换函数来实现，以下是具体的函数实现：

UTF-8到GBK的转换函数：

Function UTF2GB(UTFStr)
    Dim GBStr, i, v
    GBStr = ""
    For i = 1 To Len(UTFStr)
        c = Mid(UTFStr, i, 1)
        If c = "%" Then
            If Len(UTFStr) >= i + 8 Then
                v = ConvChinese(Mid(UTFStr, i + 1, 9))
                GBStr = GBStr & v
                i = i + 8
            Else
                v = ChrBin(Mid(UTFStr, i + 1, 2))
                GBStr = GBStr & v
                i = i + 2
            End If
        Else
            GBStr = GBStr & c
        End If
    Next
    UTF2GB = GBStr
End Function

GBK到UTF-8的转换函数：

Function GBtoUTF8(GBStr)
    Dim UTFStr, i, v
    UTFStr = ""
    For i = 1 To Len(GBStr)
        c = Mid(GBStr, i, 1)
        If c <>h Then
            v = ChrW(AscW(c))
            UTFStr = UTFStr & v
        ElseIf c <>h Then
            v = ChrW((AscW(c) &H20) * &H400 + AscW(Mid(GBStr, i + 1, 1)))
            UTFStr = UTFStr & v
            i = i + 1
        ElseIf c <>h Then
            v = ChrW((AscW(c) &H80) * &H400 + AscW(Mid(GBStr, i + 1, 1)))
            UTFStr = UTFStr & v
            i = i + 1
        ElseIf c <>h Then
            v = ChrW((AscW(c) &HF800) * &H400 + AscW(Mid(GBStr, i + 1, 1)) * &H400 + AscW(Mid(GBStr, i + 2, 1)))
            UTFStr = UTFStr & v
            i = i + 2
        End If
    Next
    GBtoUTF8 = UTFStr
End Function

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