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把.Net整合进其他平台

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整合分布式应用程序经常是一件非常困难并且错综复杂的任务，即使是最富有经验的开发者也可能会觉得头疼

作者：合肥小雨 来源：yesky 2007年11月5日

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整合PHP Web服务

　　既然一个自定义代理类已经准备好被使用，那么把它整合进一个ASP.Net页面就变得很简单了。getHeaders ()和getMessage ()方法可以调用Web服务，存取返回的XmlDocument对象(见代码段6和７) 在XmlDocument内的子结点中的枚举可以显示这些数据。 虽然许多Web服务可以很容易地使用VS.Net或者WSDL.exe创建的代理类自动地生成，但是仍然会有你需要创建自定义SOAP包装来把.Net和其他的平台整合起来的情况。 本文中介绍的内容以及代码就提供了完成这个整合工作的一种方法。

　　代码段1：

POST http://www.codecraze.com/soap/nntp.php HTTP/1.1
User-Agent: Mozilla/4.0 (compatible;
MSIE 6.0; MS Web Services Client Protocol 1.0.2914.16)
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://www.codecraze.com/soap/nntp.php"
Content-Length: 683
Expect: 100-continue
Connection: Keep-Alive
Host: www.codecraze.com

＜?xml version="1.0" encoding="utf-8"?＞
＜soap:Envelope xmlns:soap=
"http://schemas.xmlsoap.org/soap/envelope/"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/
encoding/"
xmlns:tns="http://tempuri.org/"
xmlns:types="http://tempuri.org/encodedTypes"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"＞
＜soap:Body
soap:encodingStyle=
"http://schemas.xmlsoap.org/soap/encoding/"＞
＜q1:getheaders xmlns:q1=
"http://www.codecraze.com/soap/nntp.xsd"＞
＜newsgroup xsi:type="xsd:string"＞
microsoft.public.dotnet.xml
＜/newsgroup＞
＜numitems xsi:type="xsd:string"＞15＜/numitems＞
＜/q1:getheaders＞
＜/soap:Body＞
＜/soap:Envelope＞

　　代码段2：

HTTP/1.1 200 OK
Date: Apr, 16 Dec 2002 15:57:47 GMT
Server: Apache/1.3.20 (Unix) ApacheJServ/1.1.2 PHP/
4.0.4pl1 FrontPage/5.0.2.2510 Rewrit/1.1a
X-Powered-By: PHP/4.0.4pl1
Content-Length: 419
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/xml; charset="utf-8"

＜?xml version="1.0" encoding="utf-8"?＞
＜SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/
envelope/"
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/
soap/encoding/"＞
＜SOAP-ENV:Body＞
＜SOAP-ENV:Fault＞
＜faultcode＞SOAP-ENV:Client.SOAPMessageFormat＜/
faultcode＞
＜faultstring＞
message does not have a correct SOAP root XML tag
＜/faultstring＞
＜/SOAP-ENV:Fault＞
＜/SOAP-ENV:Body＞
＜/SOAP-ENV:Envelope＞

　　代码段3 ：

private string CreateSoapEnvelope(
string method,string[] param1,
string[] param2) {
StringBuilder sb = new StringBuilder();
sb.Append("＜SOAP-ENV:Envelope");
sb.Append(" xmlns:SOAP-" +
"ENV=\"http://schemas.xmlsoap.org/soap/
envelope/\"");
sb.Append(" xmlns:xsi=
\"http://www.w3.org/1999/XMLSchema-" +
instance\"");
sb.Append(" xmlns:xsd=
\"http://www.w3.org/1999/XMLSchema\"＞");
sb.Append("＜SOAP-ENV:Body＞");
sb.Append("＜m:" + method + " xmlns:m=\"nntp.xsd\"＞");
sb.Append("＜" + param1[0] + "＞" + param1[1] +
"＜/" + param1[0] + "＞");
sb.Append("＜" + param2[0] + "＞" + param2[1] +
"＜/" + param2[0] + "＞");
sb.Append("＜/m:" + method + "＞");
sb.Append("＜/SOAP-ENV:Body＞");
sb.Append("＜/SOAP-ENV:Envelope＞");
return sb.ToString();
}

　　代码段4：

private XmlDocument SendSoapEnvelope(string soapEnv) {
HttpWebRequest request =
(HttpWebRequest)WebRequest.Create(_uri);
XmlTextReader xmlReader = null;
XmlDocument xmlDoc = null;
request.Method = "POST";
request.ContentType = "text/xml";
request.Headers.Add("SOAPAction",_soapAction);
StreamWriter writer = new StreamWriter(
request.GetRequestStream());
writer.Write(soapEnv);
writer.Close();
HttpWebResponse response =
(HttpWebResponse)request.GetResponse();

if (response != null) {
xmlReader = new XmlTextReader(
response.GetResponseStream());
xmlDoc = new XmlDocument();
xmlDoc.Load(xmlReader);
return xmlDoc;
} else {
return xmlDoc;
}
}

　　代码段5：

public XmlDocument getHeaders(string newsgroup,
string numitems) {
string soapEnv = CreateSoapEnvelope("getheaders",
new string[2]{"newsgroup",newsgroup},
new string[2]{"numitems",numitems});
return FilterSoapEnvelope(SendSoapEnvelope(soapEnv));
}

public XmlDocument getMessage(string newsgroup,
string article) {
string soapEnv = CreateSoapEnvelope("getmessage",
new string[2]{"newsgroup",newsgroup},
new string[2]{"article",article});
return FilterSoapEnvelope(SendSoapEnvelope(soapEnv));
}

　　代码段6：

private void Page_Load(object sender, System.EventArgs e)
{
StringBuilder sb = new StringBuilder();
try {
MSNewsService.MSNewsServiceProxy news =
new MSNewsService.MSNewsServiceProxy();
XmlDocument newsHeaders =
news.getHeaders("microsoft.public.dotnet.xml",
"15");
sb.Append("＜ul＞");
foreach (XmlNode node in
newsHeaders.DocumentElement.ChildNodes) {
sb.Append("＜li＞＜a href=\"JavaScript:readArticle(
'" + node.FirstChild.InnerText + "','" +
node.ChildNodes.Item(1).InnerText +
"')\"＞" + node.ChildNodes.Item(1).InnerText +
"＜/a＞＜/li＞");
}
sb.Append("＜ul＞");
lblMessages.Text = sb.ToString();
}
catch (Exception exp) {
lblMessages.Text =
"The Web Service appears to be" + " unavailable";
}
}

　　代码MSNewsServiceProxy.cs：

using System.Net;
using System.Xml;
using System.IO;
using System.Text;
namespace MSNewsService {

public class MSNewsServiceProxy {
string _uri;
string _soapAction;

public MSNewsServiceProxy() {
_uri = "http://www.codecraze.com/soap/nntp.php";
_soapAction = "http://www.codecraze.com/soap/nntp.php";
}

private XmlDocument SendSoapEnvelope(string soapEnv) {
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_uri);
XmlTextReader xmlReader = null;
XmlDocument xmlDoc = null;
request.Method = "POST";
request.ContentType = "text/xml";
request.Headers.Add("SOAPAction",_soapAction);
StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(soapEnv);
writer.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

if (response != null) {
xmlReader = new XmlTextReader(response.GetResponseStream());
xmlDoc = new XmlDocument();
xmlDoc.Load(xmlReader);
return xmlDoc;
} else {
return xmlDoc;
}
}
private string CreateSoapEnvelope(string method,string[] param1, string[] param2) {
StringBuilder sb = new StringBuilder();
sb.Append("＜SOAP-ENV:Envelope");
sb.Append(" xmlns:SOAP-" +
"ENV=\"http://schemas.xmlsoap.org/soap/envelope/\"");
sb.Append(" xmlns:xsi=\"http://www.w3.org/1999/XMLSchema-" +
"instance\"");
sb.Append(" xmlns:xsd=\"http://www.w3.org/1999/XMLSchema\"＞");
sb.Append("＜SOAP-ENV:Body＞");
sb.Append("＜m:" + method + " xmlns:m=\"nntp.xsd\"＞");
sb.Append("＜" + param1[0] + "＞" + param1[1] + "＜/" + param1[0] + "＞");
sb.Append("＜" + param2[0] + "＞" + param2[1] + "＜/" + param2[0] + "＞");
sb.Append("＜/m:" + method + "＞");
sb.Append("＜/SOAP-ENV:Body＞");
sb.Append("＜/SOAP-ENV:Envelope＞");
return sb.ToString();
}

public XmlDocument getHeaders(string newsgroup,string numitems) {
string soapEnv = CreateSoapEnvelope("getheaders",
new string[2]{"newsgroup",newsgroup},
new string[2]{"numitems",numitems});
return FilterSoapEnvelope(SendSoapEnvelope(soapEnv));
}
public XmlDocument getMessage(string newsgroup,string article) {
string soapEnv = CreateSoapEnvelope("getmessage",
new string[2]{"newsgroup",newsgroup},
new string[2]{"article",article});
return FilterSoapEnvelope(SendSoapEnvelope(soapEnv));
}

private XmlDocument FilterSoapEnvelope(XmlDocument doc) {
XmlDocument filterDoc = new XmlDocument();
XmlNode result = doc.SelectSingleNode("//results");
XmlNode resultImport = filterDoc.ImportNode(result,true);
filterDoc.AppendChild(resultImport);
return filterDoc;
}

}
}

　　代码msNewsClient.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;
using System.Text;

namespace MSNewsService
{

public class MSNewsServiceClient : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label lblMessages;

public MSNewsServiceClient()
{
Page.Init += new System.EventHandler(Page_Init);
}

private void Page_Load(object sender, System.EventArgs e) {
StringBuilder sb = new StringBuilder();
try {
MSNewsService.MSNewsServiceProxy news = new MSNewsService.MSNewsServiceProxy();
XmlDocument newsHeaders = news.getHeaders("microsoft.public.dotnet.xml","15");
sb.Append("＜ul＞");
foreach (XmlNode node in newsHeaders.DocumentElement.ChildNodes) {
sb.Append("＜li＞＜a href=\"JavaScript:readArticle('" + node.FirstChild.InnerText +
"','" + node.ChildNodes.Item(1).InnerText +
"')\"＞" + node.ChildNodes.Item(1).InnerText + "＜/a＞＜/li＞");
}
sb.Append("＜ul＞");
lblMessages.Text = sb.ToString();
}
catch (Exception exp) {
lblMessages.Text = "The Web Service appears to be unavailable";
}
}

private void Page_Init(object sender, EventArgs e)
{

InitializeComponent();
}


private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);

}

}
}

　　代码msNewsMessage.aspx

＜%@ Page language="c#" src="msNewsMessage.aspx.cs" Codebehind="msNewsMessage.aspx.cs" AutoEventWireup="false" Inherits="MSNewsService.msNewsMessage" %＞
＜HTML＞
＜body bgcolor="#ffffff"＞
＜h2＞
＜asp:Label ID="lblMessageTitle" Runat="server" /＞
＜/h2＞
＜p＞
＜asp:Label ID="lblMessageText" Runat="server" /＞
＜/p＞
＜/body＞
＜/HTML＞
代码msNewsMessage.aspx.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;

namespace MSNewsService
{

public class msNewsMessage : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label lblMessageTitle;
protected System.Web.UI.WebControls.Label lblMessageText;

public msNewsMessage()
{
Page.Init += new System.EventHandler(Page_Init);
}

private void Page_Load(object sender, System.EventArgs e) {
try {
MSNewsService.MSNewsServiceProxy news = new MSNewsService.MSNewsServiceProxy();
XmlDocument newsHeaders = news.getMessage("microsoft.public.dotnet.xml",
Request["articleID"]);
lblMessageTitle.Text = Request["title"];
lblMessageText.Text = newsHeaders.FirstChild.InnerText;
}
catch (Exception exp) {
lblMessageText.Text = "The Web Service appears to be unavailable";
}
}

private void Page_Init(object sender, EventArgs e)
{
InitializeComponent();
}


private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);

}

}
}

　　代码msNewsClient.apsx

＜%@ Page language="c#" src="msNewsClient.aspx.cs" Codebehind="msNewsClient.aspx.cs" AutoEventWireup="false" Inherits="MSNewsService.MSNewsServiceClient" %＞
＜HTML＞
＜head＞
＜script language="javascript"＞
function readArticle(id,title) {
openWindow("msNewsMessage.aspx?articleID=" + id +
"&title=" + title,500,400);
}
function openWindow(page,w,h) {
window.open(page,"","status=no,width=" + w +
",height=" + h + ",scrollbars=yes");
}
＜/script＞
＜/head＞
＜body bgcolor="#ffffff"＞
＜h2＞Recent posts from: microsoft.public.dotnet.xml＜/h2＞
＜p /＞
＜asp:Label ID="lblMessages" Runat="server" /＞
＜/body＞
＜/HTML＞＜0}

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