C# Post接收發送XML

項目分成兩個 web（ASP.Net）用戶處理請求，客戶端（wpf/winform）發送請求

1.web項目

有兩個頁面

SendPost.aspx(單純發送數據給客戶端)

代碼：

public partial class SendPost : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Request.RequestType == "POST")
{
　　//聲明一個XMLDoc文檔對象，LOAD（）xml字符串
　　XmlDocument doc = new XmlDocument();
　　doc.LoadXml("<entity><version>1.2.0_2012_12_05</version></entity>");
　　//把XML發送出去
　　Response.Write(doc.InnerXml);
　　Response.End();
}
}
}

Accept.aspx（接收數據並反饋發送會客戶端）

protected void Page_Load(object sender, EventArgs e)
{
if (Request.RequestType == "POST")
{
　　//接收並讀取POST過來的XML文件流
　　StreamReader reader = new StreamReader(Request.InputStream);
　　String xmlData = reader.ReadToEnd();
　　//把數據重新返回給客戶端
　　Response.Write(xmlData);
　　Response.End();
}
}

2.客戶端項目：

一個處理Post類

public class PostHelp
{
public string GetWebContent(string url)
{
Stream outstream = null;
Stream instream = null;
StreamReader sr = null;
HttpWebResponse response = null;
HttpWebRequest request = null;
// 要注意的這是這個編碼方式，還有內容的Xml內容的編碼方式
Encoding encoding = Encoding.GetEncoding("UTF-8");
byte[] data = encoding.GetBytes(url);

// 準備請求,設置參數
request = WebRequest.Create(url) as HttpWebRequest;
request.Method = "POST";
request.ContentType = "text/xml";
//request.ContentLength = data.Length;

outstream = request.GetRequestStream();
outstream.Write(data, 0, data.Length);
outstream.Flush();
outstream.Close();
//發送請求並獲取相應迴應數據

response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序纔開始向目標網頁發送Post請求
instream = response.GetResponseStream();

sr = new StreamReader(instream, encoding);
//返回結果網頁(html)代碼

string content = sr.ReadToEnd();
return content;
}
public string PostXml(string url, string strPost)
{
string result = "";

StreamWriter myWriter = null;
HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(url);
objRequest.Method = "POST";
//objRequest.ContentLength = strPost.Length;
objRequest.ContentType = "text/xml";//提交xml 
//objRequest.ContentType = "application/x-www-form-urlencoded";//提交表單
try
{
myWriter = new StreamWriter(objRequest.GetRequestStream());
myWriter.Write(strPost);
}
catch (Exception e)
{
return e.Message;
}
finally
{
myWriter.Close();
}

HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
{
result = sr.ReadToEnd();
sr.Close();
}
return result;
}
}

一個XML處理類

public class XMLHelp
{
private XDocument _document;

public XDocument Document
{
get { return _document; }
set { _document = value; }
}
private string _fPath = "";

public string FPath
{
get { return _fPath; }
set { _fPath = value; }
}

/// <summary>
/// 初始化數據文件，當數據文件不存在時則創建。
/// </summary>
public void Initialize()
{
if (!File.Exists(this._fPath))
{
this._document = new XDocument(
new XElement("entity", string.Empty)
);
this._document.Save(this._fPath);
}
else
this._document = XDocument.Load(this._fPath);
}

public void Initialize(string xmlData)
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlData);

this._document = XmlDocumentExtensions.ToXDocument(doc, LoadOptions.None);
}
/// <summary>
/// 清空用戶信息
/// </summary>
public void ClearGuest()
{
XElement root = this._document.Root;
if (root.HasElements)
{
XElement entity = root.Element("entity");
entity.RemoveAll();
}
else
root.Add(new XElement("entity", string.Empty));
}

///LYJ 修改
/// <summary>
/// 提交併最終保存數據到文件。
/// </summary>

public void Commit()
{
try
{
this._document.Save(this._fPath);
}
catch (Exception ex)
{
throw new Exception(ex.Message, ex);
}
}

/// <summary>
/// 更新
/// </summary>
public void UpdateQrState(string PId, string state)
{
XElement root = this._document.Root;
XElement entity = root.Element("entity");

IEnumerable<XElement> elements = entity.Elements().Where(p =>
p.Attribute("PId").Value == PId);
if (elements.Count() == 0)
return;
else
{
XElement guest = elements.First();
guest.Attribute("FQdState").Value = state;
guest.Attribute("FQdTime").Value = DateTime.Now.ToString();
Commit();
}
}

public IEnumerable<XElement> GetXElement()
{
XElement root = this._document.Root;
IEnumerable<XElement> elements = root.Elements();
return elements;
}

 

public DataTable GetEntityTable()
{
DataTable dtData = new DataTable();
XElement root = this._document.Root;
IEnumerable<XElement> elements = root.Elements();

foreach (XElement item in elements)
{
dtData.Columns.Add(item.Name.LocalName);
}
DataRow dr = dtData.NewRow();
int i = 0;
foreach (XElement item in elements)
{
dr[i] = item.Value;
i = i + 1;
}
dtData.Rows.Add(dr);
return dtData;
}

}

因爲我這裏用的是Linq操作XML所以多一個轉換XML類

public static class XmlDocumentExtensions
{
public static XDocument ToXDocument(this XmlDocument document)
{
return document.ToXDocument(LoadOptions.None);
}

public static XDocument ToXDocument(this XmlDocument document, LoadOptions options)
{
using (XmlNodeReader reader = new XmlNodeReader(document))
{
return XDocument.Load(reader, options);
}
}
}

客戶端加個按鈕，按鈕代碼

private void button5_Click(object sender, RoutedEventArgs e)
{
PostHelp ph = new PostHelp();
//請求，拿到數據
string value = ph.GetWebContent("http://192.168.52.24:802/SendPost.aspx");
//保存數據
XMLHelp xh = new XMLHelp();
xh.Document = XDocument.Parse(value);
xh.FPath = Environment.CurrentDirectory + "\\xml\\a.xml";
xh.Commit();
//重新把數據拿出來，發送
string a = xh.Document.ToString();
string text = ph.PostXml("http://192.168.52.24:802/Accept.aspx", a);
//根據得到數據顯示
this.textBlock1.Text = text;
//把數據轉換成DataTable，輸出要的結果集
DataTable dt = xh.GetEntityTable();
MessageBox.Show(dt.Rows[0][0].ToString());

}

代碼很多，思路雖然有寫在註釋裏，但是還是不夠清楚，我這裏重新說一下

1.首先是Post請求發送原理，客戶端請求一個request，並把內容加到request中，發送到指定路徑的頁面，頁面得到請求，返回數據，客戶端再基於剛剛的request去GetResponse（）得到返回數據

2.另外一個是XML的操作，包括讀取xml，把xml轉成字符串用於發送，得到返回內容，保存到本地xml，再讀取本地的xml，輸出xml裏面的值

這裏再提一下：想調試web，必須用vs自帶的IIS虛擬器，在web項目設置個斷點，然後運行，客戶端請求的request的時候，web就會自動斷到斷點，就可以調試啦。

不過用vs自帶的虛擬器，會經常出現連接已斷開的問題，等你調試好後，直接放到IIS中，或者不用vs自帶的IIS虛擬器，直接設置項目指定到IIS位置，這種錯誤就不會出現了！