WebService 数据压缩
很长时间没有更新博客了
一直在忙这做项目,累啊,苦啊
现在刚好忙完了,赶紧看看兄弟姐妹们的博客,其中看了刚刚兄有关Web服务初探:用Demo学Web服务系列,使自己才更清楚的了解了WebService,Thx!
然而项目中有时数据大,所以在网上搜了个压缩数据的,特此贴出来,方便自己日后用到,也希望能给大家一些帮助,呵呵
CompressionExtension.cs:
using System;
using System.IO;
using System.Text ;
using System.Web.Services;
using System.Web.Services.Protocols ;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
using System.Xml ;
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namespace BLL
{
/// <summary>
/// Summary description for ConpressionExtension.
/// </summary>
public class CompressionExtension : System.Web.Services.Protocols.SoapExtension
{
Stream oldStream;
Stream newStream;
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public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute)
{
return attribute;
}
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// Get the Type
public override object GetInitializer(Type t)
{
return typeof(CompressionExtension);
}
// Get the CompressionExtensionAttribute
public override void Initialize(object initializer)
{
CompressionExtensionAttribute attribute = (CompressionExtensionAttribute) initializer;
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return;
}
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// Process the SOAP Message
public override void ProcessMessage(SoapMessage message)
{
// Check for the various SOAP Message Stages
switch (message.Stage)
{
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case SoapMessageStage.BeforeSerialize:
break;
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case SoapMessageStage.AfterSerialize:
// ZIP the contents of the SOAP Body after it has
// been serialized
Zip();
break;
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case SoapMessageStage.BeforeDeserialize:
// Unzip the contents of the SOAP Body before it is
// deserialized
Unzip();
break;
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case SoapMessageStage.AfterDeserialize:
break;
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default:
throw new Exception("invalid stage");
}
}
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// Gives us the ability to get hold of the RAW SOAP message
public override Stream ChainStream( Stream stream )
{
oldStream = stream;
newStream = new MemoryStream();
return newStream;
}
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// Utility method to copy streams
void Copy(Stream from, Stream to)
{
TextReader reader = new StreamReader(from);
TextWriter writer = new StreamWriter(to);
writer.WriteLine(reader.ReadToEnd());
writer.Flush();
}
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// Zip the SOAP Body
private void Zip()
{
newStream.Position = 0;
// Zip the SOAP Body
newStream = ZipSoap(newStream);
// Copy the streams
Copy(newStream, oldStream);
}
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// The actual ZIP method
private byte[] Zip(string stringToZip)
{
byte[] inputByteArray = Encoding.UTF8.GetBytes(stringToZip);
MemoryStream ms = new MemoryStream();
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// Check the #ziplib docs for more information
ZipOutputStream zipOut = new ZipOutputStream( ms ) ;
ZipEntry ZipEntry = new ZipEntry("ZippedFile");
zipOut.PutNextEntry(ZipEntry);
zipOut.SetLevel(9);
zipOut.Write(inputByteArray, 0 , inputByteArray.Length ) ;
zipOut.Finish();
zipOut.Close();
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// Return the zipped contents
return ms.ToArray();
}
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// Select and Zip the appropriate parts of the SOAP message
public MemoryStream ZipSoap(Stream streamToZip)
{
streamToZip.Position = 0;
// Load a XML Reader
XmlTextReader reader = new XmlTextReader(streamToZip);
XmlDocument dom = new XmlDocument();
dom.Load(reader);
// Load a NamespaceManager to enable XPath selection
XmlNamespaceManager nsmgr = new XmlNamespaceManager(dom.NameTable);
nsmgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
XmlNode node = dom.SelectSingleNode("//soap:Body", nsmgr);
// Select the contents within the method defined in the SOAP body
node = node.FirstChild.FirstChild;
// Check if there are any nodes selected
while( node != null )
{
if( node.InnerXml.Length > 0 )
{
// Zip the data
byte[] outData = Zip(node.InnerXml);
// Convert it to Base64 for transfer over the internet
node.InnerXml = Convert.ToBase64String(outData) ;
}
// Move to the next parameter
node = node.NextSibling ;
}
MemoryStream ms = new MemoryStream();
// Save the updated data
dom.Save(ms);
ms.Position = 0;
return ms;
}
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// Unzip the SOAP Body
private void Unzip()
{
MemoryStream unzipedStream = new MemoryStream();
TextReader reader = new StreamReader(oldStream);
TextWriter writer = new StreamWriter(unzipedStream);
writer.WriteLine(reader.ReadToEnd());
writer.Flush();
// Unzip the SOAP Body
unzipedStream = UnzipSoap(unzipedStream);
// Copy the streams
Copy(unzipedStream, newStream);
newStream.Position = 0;
}
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// Actual Unzip logic
private byte[] Unzip(string stringToUnzip)
{
// Decode the Base64 encoding
byte[] inputByteArray = Convert.FromBase64String( stringToUnzip ) ;
MemoryStream ms = new MemoryStream(inputByteArray) ;
MemoryStream ret = new MemoryStream();
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// Refer to #ziplib documentation for more info on this
ZipInputStream zipIn = new ZipInputStream(ms);
ZipEntry theEntry = zipIn.GetNextEntry();
Byte[] buffer = new Byte[2048] ;
int size = 2048;
while (true)
{
size = zipIn.Read(buffer, 0, buffer.Length);
if (size > 0)
{
ret.Write(buffer, 0, size);
}
else
{
break;
}
}
return ret.ToArray();
}
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// Unzip the SOAP Body
public MemoryStream UnzipSoap(Stream streamToUnzip)
{
streamToUnzip.Position = 0;
// Load a XmlReader
XmlTextReader reader = new XmlTextReader(streamToUnzip);
XmlDocument dom = new XmlDocument();
dom.Load(reader);
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XmlNamespaceManager nsmgr = new XmlNamespaceManager(dom.NameTable);
nsmgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
// Select the SOAP Body node
XmlNode node = dom.SelectSingleNode("//soap:Body", nsmgr);
node = node.FirstChild.FirstChild;
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// Check if node exists
while( node != null )
{
if( node.InnerXml.Length >0 )
{
// Send the node's contents to be unziped
byte[] outData = Unzip(node.InnerXml);
string sTmp = Encoding.UTF8.GetString(outData);
node.InnerXml = sTmp;
}
// Move to the next parameter
node = node.NextSibling ;
}
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MemoryStream ms = new MemoryStream();
dom.Save(ms);
ms.Position = 0;
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return ms;
}
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}
}
CompressionExtensionAttribute.cs:
using System;
using System.Web.Services;
using System.Web.Services.Protocols;
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namespace BLL
{
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/// <summary>
/// Summary description for CompressionExtensionAttribute.
/// </summary>
// Make the Attribute only Applicable to Methods
[AttributeUsage(AttributeTargets.Method)]
public class CompressionExtensionAttribute : System.Web.Services.Protocols.SoapExtensionAttribute
{
private int priority;
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// Override the base class properties
public override Type ExtensionType
{
get { return typeof(CompressionExtension); }
}
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public override int Priority
{
get
{
return priority;
}
set
{
priority = value;
}
}
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}
}
在server | Client 都需要
调用很简单,只要在代理类中web方法加个:
[CompressionExtension]
原文地址:http://www.123aspx.com/redir.aspx?res=29459
一直在忙这做项目,累啊,苦啊
现在刚好忙完了,赶紧看看兄弟姐妹们的博客,其中看了刚刚兄有关Web服务初探:用Demo学Web服务系列,使自己才更清楚的了解了WebService,Thx!
然而项目中有时数据大,所以在网上搜了个压缩数据的,特此贴出来,方便自己日后用到,也希望能给大家一些帮助,呵呵
CompressionExtension.cs:
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调用很简单,只要在代理类中web方法加个:
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原文地址:http://www.123aspx.com/redir.aspx?res=29459