ASP基礎(chǔ):將HTML表單數(shù)據(jù)存儲為XML格式
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admin
2010年8月19日 23:13
本文熱度 3396
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如你熟知ASP，XML和HTML4。0，請讀下列示例 將表單數(shù)據(jù)存為XML格式 通常的，ASP中表單提交的數(shù)據(jù)一般被寫入數(shù)據(jù)庫。然而，如果你想讓發(fā)送數(shù)據(jù)更為簡便易行，那么，可以將它書寫為XML文件格式。這種方式對于在web上收集的數(shù)據(jù)更為有用。因為XML對于所用平臺來說非常的簡便，所以用不著轉(zhuǎn)換數(shù)據(jù)格式。 將提交的數(shù)據(jù)寫為XML文檔，則需要通過Microsoft XMLDOM Object創(chuàng)建一個新的XML文檔。Microsoft XMLDOM Object擁有一個可擴展對象庫，通過它可以創(chuàng)建elements，attributes以及values，通過創(chuàng)建的這些項目則可以組成XML文檔。我無法將整個目標模型做個完整的介紹，因為它所包含的內(nèi)容太廣泛，對于將建成的網(wǎng)站來說，目標模型甚至通過自身也能組建一個相對完整的部份。 在XMLDOM Object被創(chuàng)建出來之后，通過創(chuàng)建目標（此目標是關(guān)于組成XML文檔中每一層的ELEMENTS而言）XML的結(jié)構(gòu)會被演示出來。接下來，會舉例說明XMLDOM是怎樣被創(chuàng)建出來的。創(chuàng)建root element之后，將它附加在XMLDOM文件上。然后創(chuàng)建child elements并附加在root element上，最后存儲文檔。 演示Microsoft XMLDOM 對象 <% Dim objDom Dim objRoot Dim objChild1 Dim objChild2 Dim objPI " XMLDOM 對象使用Server對象的CreateObject方法創(chuàng)建 Set objDom = Server.CreateObject("Microsoft.XMLDOM") "使用XMLDOM的createElemnet方法創(chuàng)建一個IXMLDOMElement對象。 "createElemnet方法又一個string參數(shù)，這個string 表示該element的名稱。 返回值被傳遞到objRoot變量。objRoot表示XML文檔的根元素.。 Set objRoot = objDom.createElement("rootElement") "Use the appendChild Method of the XMLDOM Object to add the objRoot "Element Reference to the XML Document. objDom.appendChild objRoot "Now, following the same steps, you will create references to the "child elements for the XML Document. The only difference is, when the "child elements are appended to the document, you will call the "appendChild Method of the IXMLDOMElement Object rather than the "appendChild Method of the XMLDOM Object. By using the IXMLDOMElement "to append the children, you are differentiating (and applying tiered "structure to) the child elements from the root element. Set objChild1 = objDom.createElement("childElement1") objRoot.appendChild objChild1 Set objChild1 = objDom.createElement("childElement2") objRoot.appendChild objChild2 "The final step to take care of before saving this document is to add "an XML processing instruction. This is necessary so that XML parsers "will recognize this document as an XML document. Set objPI = objDom.createProcessingInstruction("xml","vertsion="1.0"") "Call the insertBefore Method of the XMLDOM Object in order to insert "the processing instruction before the root element (the zero element "in the XMLDOM childNodes Collection). objDom.insertBefore objPI, objDom.childNodes(0) "Calling the Save Method of the XMLDOM Object will save this XML "document to your disk drive. In this case, the document will be saved "to the "c:" drive and will be named "MyXMLDoc.xml". When saving an "XML document, if the file does not exist, it will be created. If it "does exist, it will be overwritten. objDom.Save "c:MyXMLDoc.xml" %> 文檔被存檔之后，如果你再打開這個文檔，那么則會以如下代碼列表形式出現(xiàn)： MyXMLDoc.xml:
在"MyXMLDoc.xml"文檔中，childElement1 和 childElement2 會以空的elements形式出現(xiàn)。如果它們被賦值，那么每個值都將由標記符括起來。 現(xiàn)在，讓我們來思考一下如何將HTML數(shù)據(jù)寫到XML文檔中去。我們已經(jīng)知道該如何創(chuàng)建和存儲XML文檔。將一個表單數(shù)據(jù)寫到XML文檔中去的過程，現(xiàn)在已演變成為Request Object"s Form Collection以及將每一個表單域的value書定到XML element value 中去的步驟重復(fù)。以上可以通過ASP來完成。 例：將數(shù)據(jù)輸送到XML 現(xiàn)在，我們舉一個普通的HTML表單的例子來說明。此Form有用戶名，地址，電話，以及E-MAIL等幾個域。并將這些信息寫入XML文件中并保存。 EnterContact.html: <BR>Contact Information <BR>
Please input your contact infomation here:
| First Name: | |
| Last Name: | |
| Address #1: | |
| Address #2: | |
| Phone Number: | |
| E-Mail: | |
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將Form 中數(shù)據(jù)發(fā)送到ProcessForm.asp.。這是一個ASP頁面，在這個ASP中將反復(fù)調(diào)用同一個函數(shù)將form數(shù)據(jù)寫入XML
文件。
ProcessForm.asp:
<%
’--------------------------------------------------------------------
’The "ConvertFormtoXML" Function accepts to parameters.
’strXMLFilePath - The physical path where the XML file will be saved.
’strFileName - The name of the XML file that will be saved.
’--------------------------------------------------------------------
Function ConvertFormtoXML(strXMLFilePath, strFileName)
’Declare local variables.
Dim objDom
Dim objRoot
Dim objField
Dim objFieldValue
Dim objAttID
Dim objAttTabOrder
Dim objPI
Dim x
’Instantiate the Microsoft XMLDOM.
Set objDom = server.CreateObject("Microsoft.XMLDOM")
objDom.PreserveWhiteSpace = True
’Create your root element and append it to the XML document.
Set objRoot = objDom.CreateElement("Contact")
objDom.AppendChild objRoot
’Iterate through the Form Collection of the Request Object.
For x = 1 To Request.Form.Count
’Check to see if "btn" is in the name of the form element.
’If it is, then it is a button and we do not want to add it
’to the XML document.
If Instr(1,Request.Form.Key(x),"btn") = 0 Then
’Create an element, "field".
Set objField = objDom.CreateElement("Field")
’Create an attribute, "ID".
Set objAttID = objDom.CreateAttribute("ID")
’Set the value of the id attribute equal the the name of
’the current form field.
objAttID.Text = Request.Form.Key(x)
’The setAttributeNode method will append the id attribute
’to the field element.
objField.SetAttributeNode objAttID
’Create another attribute, "taborder". This just orders the
’elements.
Set objattTabOrder = objDom.createAttribute("taborder")
’Set the value of the taborder attribute.
objAttTabOrder.Text = x
’Append the taborder attribute to the field element.
objField.SetAttributeNode objAttTabOrder
’Create a new element, "field_value".
Set objFieldValue = objDom.CreateElement("FieldValue")
’Set the value of the field_value element equal to
’the value of the current field in the Form Collection.
objFieldValue.Text = Request.Form(x)
’Append the field element as a child of the root element.
objRoot.AppendChild objField
’Append the field_value element as a child of the field elemnt.
objField.AppendChild objFieldValue
End If
Next
’Create the xml processing instruction.
Set objPI = objDom.CreateProcessingInstruction("xml", "version=""1.0""")
’Append the processing instruction to the XML document.
objDom.InsertBefore objPI, objDom.ChildNodes(0)
’Save the XML document.
objDom.Save strXMLFilePath & "" & strFileName
’Release all of your object references.
Set objDom = Nothing
Set objRoot = Nothing
Set objField = Nothing
Set objFieldValue = Nothing
Set objAttID = Nothing
Set objAttTabOrder = Nothing
Set objPI = Nothing
End Function
’Do not break on an error.
On Error Resume Next
’Call the ConvertFormtoXML function, passing in the physical path to
’save the file to and the name that you wish to use for the file.
ConvertFormtoXML "F:\Asp\","Contact.xml"
’Test to see if an error occurred, if so, let the user know.
’Otherwise, tell the user that the operation was successful.
If Err.Number <> 0 then
Response.Write("Errors occurred while saving your form submission.")
Else
Response.Write("Your form submission has been saved.
Go Back")
End If
%>
如果你是在你自己的應(yīng)用程序中使用以上代碼，請謹記一件事情，在"ConvertFormtoXML"函數(shù)已經(jīng)運行的情況下，如果XML文件名已經(jīng)存在，那么，文件將會被覆蓋。在此，我建議在使用"ConvertFormtoXML"功能前，最好用隨機建立的文件名。這樣，就將有價值數(shù)據(jù)被改寫的風(fēng)險降為零。
關(guān)于XML文件的產(chǎn)生，舉例如下：
Contact.xml:
Dicky
Gu
ShangHai
BeiJing
123456
AppleBBS@GMail.Com
我在此建議：將以上代碼復(fù)制到你個人網(wǎng)站服務(wù)器上的同名頁面上，并運行以上示例時。請一定要明確你使用的是對你個人服務(wù)器有效的路徑和文件名。
當你一切準備好時，請再次檢驗?zāi)愕腦ML文件。
該文章在 2010/8/19 23:13:56 編輯過
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