ASP调用webService

可能，大多数的人认为我们需要运行asp.net或使用soap toolkit以访问webservice

但是这不是必需的，使用微软的xml parser我们同样可以利用传统的asp页面来访问webservice,下面我就展示给大家看一看！

我将使用三个文件来实现我的展示。

     global.asa，当程序开始运行时，使用application变量

     i_soapcall.asp 一个包含文件，用以访问soap service

     default.asp 一个基本的asp文件，用以显示soap数据

Global.asa

         当website运行时global.asa时刻都在运行，在application_onstart中我们加入application变量

     源代码:

————————————————————————————————————————————

<SCRIPT LANGUAGE=VBScript RUNAT=Server>

Sub Application_OnStart

     Dim ASPNETResources

     ASPNETResources = GetASPNetResources()    

     Application("ASPNETExpires") = 12    

     If Len(ASPNETResources) >0 then    

         Application.Lock

         Application("ASPNETResourcesUpdated")=Now()

         Application("ASPNETResourceList")=ASPNETResources

         Application.UnLock

     End if

End Sub

</script>

<!-- #include file="i_soapcall.asp" -->

——————————————————————————————————————

当application第一次执行时，我们定义了一个变量：ASPNETResources,它的值是函数GetASPNetResources()的执行结果，这

个函数可以在包含文件i_soapcall.asp中找到，他返回一个字符串，随后我们定义了过期时间的变量：

Application("ASPNETExpires")，我们将在default.asp中使用，最后我们检查了GetASPNetResources()是否执行正确，返回

值长度是否大于0,如果成功我们需要纪录时间 Application("ASPNETResourcesUpdated"), 和执行结果

Application("ASPNETResourceList"). 在后面我将告诉大家这些变量是做什么的！

Default.asp

default.asp是用来显示我们的webservice请求

——————————————————————————————————————————————

<%

Dim      ASPNETResources    

If len( Application("ASPNETResourceList") )>0 then    

   

     If DateDiff("h",Now(),Application("ASPNETResourcesUpdated")) > Application("ASPNETExpires") Then    

        

         ASPNETResources = GetASPNetResources()

         Application.Lock

         Application("ASPNETResourcesUpdated")=Now()

         Application("ASPNETResourceList")=ASPNETResources

         Application.UnLock

     End if

Else   

     ASPNETResources = GetASPNetResources()

     Application.Lock

     Application("ASPNETResourcesUpdated")=Now()

     Application("ASPNETResourceList")=ASPNETResources

     Application.UnLock

End if

Response.Write      Application("ASPNETResourceList")

%>

———————————————————————————————————————

现在是神秘的i_soapcall.asp

大家在想神秘的GetASPNetResources（）到底是什么样子的，可以用基本的asp页面调用webservice,不要忘了soap service无

论是wsdl文档还是执行结果都是一个xml文档，所以我们可以parse(解析)它，这并不困难！

在函数中我们用到两个object

Function GetASPNetResources()    

     Set SoapRequest = Server.CreateObject("MSXML2.XMLHTTP")

     Set myXML =Server.CreateObject("MSXML.DOMDocument")

SoapRequest 是服务器端组件，可以发送post和get请求。

myXML将被用来创建一个soap service的xml文档

————————————————————————————————————————————

myXML.Async=False

     SoapURL = "http://64.85.12.73/WebSvc/whatsnew123apx_ds.asmx/GetNew123aspXResources?"

     SoapRequest.Open "GET",SoapURL , False

     SoapRequest.Send()

     if Not myXML.load(SoapRequest.responseXML) then

         returnString = ""

     Else   

—————————————————————————————————————————————

我们设定SoapURL 为我们的webservice的url然后我们用下面的语句打开连接

——————————————————————————————————————————————

SoapRequest.Open "GET",SoapURL , False

_____________________________________________________________________________________________

SoapRequest.Open有五个参数，但是只有前两个是必需的，这意味着其他三个是可以随意选择的

参数解释：

oServerXMLHTTPRequest.open bstrMethod, bstrUrl, bAsync, bstrUser, bstrPassword

     Parameters

     bstrMethod

         HTTP method used to open the connection, such as PUT or PROPFIND.

     bstrUrl

         Requested URL. This must be an absolute URL, such as "http://Myserver/Mypath/Myfile.asp".

     bAsync (optional)

         Boolean. Indicator as to whether the call is asynchronous. The default is False (the call does not

return immediately).

     bstrUser (optional)

         Name of the user for authentication.

     bstrPassword (optional)

         Password for authentication. This parameter is ignored if the user parameter is Null or missing

设置完毕我们用SoapRequest.Send()向服务器发送请求，服务器返回的结果作为文本被存储在SoapRequest.responseXML中

我们要做的就是构析这段文本。

下面给出i_soapcall.asp的全部代码

<script language="vbscript" runat="server">

Function GetASPNetResources()    

     Dim returnString

     Dim myXML

     Dim SoapRequest

     Dim SoapURL

     Set SoapRequest = Server.CreateObject("MSXML2.XMLHTTP")

     Set myXML =Server.CreateObject("MSXML.DOMDocument")

     myXML.Async=False

     SoapURL = "http://64.85.12.73/WebSvc/whatsnew123apx_ds.asmx/GetNew123aspXResources?"

     '这是真实可用的webservice

     SoapRequest.Open "GET",SoapURL , False

     SoapRequest.Send()

     if Not myXML.load(SoapRequest.responseXML) then 'an Error loading XML

         returnString = ""

     Else     'parse the XML

         Dim nodesURL

         Dim nodesName

         Dim nodesDateUpdated

         Dim nodesDomain

         Dim NumOfNodes

         Dim ResourceList

         Dim i

         REM -- The XML Nodes are CASE SENSITIVVE!

         Set nodesURL=myXML.documentElement.selectNodes("//URL")

         Set nodesName=myXML.documentElement.selectNodes("//Name")

         REM -- uncomment the following lines if we want to access the DataUpdated and the Domain Nodes

         REM --Set nodesDateUpdated = myXML.documentElement.selectNodes("//DateUpdated")

         REM --Set nodesDomain = myXML.documentElement.selectNodes("//Domain")

         REM -- the number of nodes in the list

         NumOfNodes = nodesURL.Length

         ResourceList = "<font face=verdana size=2>Latest ASP.NET Resources</font><ul>"

         For i = 0 to NumOfNodes -1

             ResourceList = ResourceList & "<li><a href=" & nodesURL(i).text & "><font face=verdana size=2>" &

nodesName(i).text & "</font></a></li>"

         next

         ResourceList =ResourceList & "</ul>"

        

         returnString = ResourceList

    

         Set nodesURL = Nothing

         Set nodesName = Nothing

     End If

    

     Set SoapRequest = Nothing

     Set myXML = Nothing

    

    

     GetASPNetResources = returnString

End Function

</script>

同样的创作思路可以用在别的编程语言中