由于不能直接访问指定数据库，只能通过跳板机查询Oracle数据，所以要做一个数据中转接口，
查询数据就要压缩，于是就找资料，代码如下，其中要注意的是Response.Headers.Remove("Content-Encoding");
这段，对Response.Headrs的操作如果IIS6是不支持的，
会出现如下错误：
接口出现错误："此操作要求使用 IIS 集成管线模式。" ()
System.PlatformNotSupportedException: 此操作要求使用 IIS 集成管线模式
其实在OnActionExecuting 这个方法中，请求中Content-Encoding本来就是空的，可以不必操作，
在项目中添加下面的类；
然后在Contoller方法上加上对应数据，即可实现对数据的压缩。
// <summary>
/// 自动识别客户端是否支持压缩，如果支持则返回压缩后的数据
/// Attribute that can be added to controller methods to force content
/// to be GZip encoded if the client supports it
/// </summary>
public class CompressContentAttribute : ActionFilterAttribute
{
/// <summary>
/// Override to compress the content that is generated by
/// an action method.
/// </summary>
/// <param name="filterContext"></param>
public override void OnActionExecuting(HttpActionContext filterContext)
{
GZipEncodePage();
} /// <summary>
/// Determines if GZip is supported
/// </summary>
/// <returns></returns>
public static bool IsGZipSupported()
{
string AcceptEncoding = HttpContext.Current.Request.Headers["Accept-Encoding"];
if (!string.IsNullOrEmpty(AcceptEncoding) &&
(AcceptEncoding.Contains("gzip") || AcceptEncoding.Contains("deflate")))
return true;
return false;
} /// <summary>
/// Sets up the current page or handler to use GZip through a Response.Filter
/// IMPORTANT:
/// You have to call this method before any output is generated!
/// </summary>
public static void GZipEncodePage()
{
HttpResponse Response = HttpContext.Current.Response; if (IsGZipSupported())
{
string AcceptEncoding = HttpContext.Current.Request.Headers["Accept-Encoding"]; if (AcceptEncoding.Contains("deflate"))
{
Response.Filter = new System.IO.Compression.DeflateStream(Response.Filter,
System.IO.Compression.CompressionMode.Compress);
#region II6不支持此方法,(实际上此值默认为null 也不需要移除)
//Response.Headers.Remove("Content-Encoding");
#endregion
Response.AppendHeader("Content-Encoding", "deflate");
}
else
{
Response.Filter = new System.IO.Compression.GZipStream(Response.Filter,
System.IO.Compression.CompressionMode.Compress);
#region II6不支持此方法,(实际上此值默认为null 也不需要移除)
//Response.Headers.Remove("Content-Encoding");
#endregion
Response.AppendHeader("Content-Encoding", "gzip");
}
} // Allow proxy servers to cache encoded and unencoded versions separately
Response.AppendHeader("Vary", "Content-Encoding");
}
} /// <summary>
/// 强制Defalte压缩
/// Content-encoding:gzip，Content-Type:application/json
/// DEFLATE是一个无专利的压缩算法，它可以实现无损数据压缩，有众多开源的实现算法。
/// </summary>
public class DeflateCompressionAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(HttpActionContext filterContext)
{
HttpResponse Response = HttpContext.Current.Response;
Response.Filter = new System.IO.Compression.DeflateStream(Response.Filter,
System.IO.Compression.CompressionMode.Compress);
#region II6不支持此方法,(实际上此值默认为null 也不需要移除)
//Response.Headers.Remove("Content-Encoding");
#endregion
Response.AppendHeader("Content-Encoding", "deflate");
} //public override void OnActionExecuted(HttpActionExecutedContext actContext)
//{
// var content = actContext.Response.Content;
// var bytes = content == null ? null : content.ReadAsByteArrayAsync().Result;
// var zlibbedContent = bytes == null ? new byte[0] :
// APP.Core.Utility.ZHelper.DeflateByte(bytes);
// actContext.Response.Content = new ByteArrayContent(zlibbedContent);
// actContext.Response.Content.Headers.Remove("Content-Type");
// actContext.Response.Content.Headers.Add("Content-encoding", "deflate");
// actContext.Response.Content.Headers.Add("Content-Type", "application/json");
// base.OnActionExecuted(actContext);
//}
} /// <summary>
/// 强制GZip压缩，application/json
/// Content-encoding:gzip，Content-Type:application/json
/// GZIP是使用DEFLATE进行压缩数据的另一个压缩库
/// </summary>
public class GZipCompressionAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(HttpActionContext filterContext)
{
HttpResponse Response = HttpContext.Current.Response;
Response.Filter = new System.IO.Compression.GZipStream(Response.Filter,
System.IO.Compression.CompressionMode.Compress);
#region II6不支持此方法,(实际上此值默认为null 也不需要移除)
//Response.Headers.Remove("Content-Encoding");
#endregion
Response.AppendHeader("Content-Encoding", "gzip");
} //public override void OnActionExecuted(HttpActionExecutedContext actContext)
//{
// var content = actContext.Response.Content;
// var bytes = content == null ? null : content.ReadAsByteArrayAsync().Result;
// var zlibbedContent = bytes == null ? new byte[0] :
// APP.Core.Utility.ZHelper.GZipByte(bytes);
// actContext.Response.Content = new ByteArrayContent(zlibbedContent);
// actContext.Response.Content.Headers.Remove("Content-Type");
// actContext.Response.Content.Headers.Add("Content-encoding", "gzip");
// actContext.Response.Content.Headers.Add("Content-Type", "application/json");
// base.OnActionExecuted(actContext);
//}
}
使用方法
[DeflateCompression]
public string GetDeflate()
{
return "valuevaluevaluevaluevaluevaluevaluevaluevaluevalueSDFASDFASDFASDFASDFWERFWEFCASDFSDAFASDFASDFASDFSADFSA";
} [CompressContent]
public string GetGZip()
{
return "valuevaluevaluevaluevaluevaluevaluevaluevaluevalueSDFASDFASDFASDFASDFWERFWEFCASDFSDAFASDFASDFASDFSADFSA";
} [GZipCompression]
public string GetRaw()
{
return "valuevaluevaluevaluevaluevaluevaluevaluevaluevalueSDFASDFASDFASDFASDFWERFWEFCASDFSDAFASDFASDFASDFSADFSA";
}