常用WebServices返回数据的4种方法比较
以前经常在群里听到朋友们说WebServices的性能特别的慢,说的如何如何。说实话,WebServices的确比调用本地数据要慢一些,可 是究竟有多慢,真的如朋友们说的那么难以忍受吗?我个人感觉,多半原因在处理的方式上。让我们亲自编写测试代码,来证明这一切吧。文章由于是我一段时间的 总结篇,因此难免参杂个人主观因素,说的不对的地方,还请多多批评。以下我们主要从调用WebServices的方法的特点、应用场景、测试结果三个方面 来进行下说明分析。 1. 直接返回DataSet对象 ??? 特点:直接返回DataSet对象。 ??? 应用场景:1.内网。2.外网且数据量在kb级别时。 2.返回DataSet对象用Binary序列化后的字节数组 ? ? 特点:字节数组流的处理模式。 ? ? 应用场景:较大数据交换。 3.返回DataSetSurrogate对象用Binary序列化后的字节数组 ? ? 特点:使用微软提供的开源组件进行序列化,依然是字节流的处理模式。详情请参考:http://support.microsoft.com/kb/829740/zh-cn ? ? 应用场景: 较大数据交换。 4.返回DataSetSurrogate对象用Binary序列化并Zip压缩后的字节数组 ? ?? 特点:使用微软提供的开源组件对字节流数组进行压缩后传递,依然是字节流的处理模式。详情请参考:http://support.microsoft.com/kb/829740/zh-cn ? ?? 应用场景:外网环境需要进行大数据量网络数据传递时,建议采用此种方法。也是笔者强烈向大家推荐使用的一种方法。 WebServices的代码如下: using ?System; using ?System.Collections.Generic; using ?System.Web; using ?System.Web.Services; using ?System.Data; using ?Microsoft.Practices.EnterpriseLibrary.Common; using ?Microsoft.Practices.EnterpriseLibrary.Data; using ?System.IO; using ?System.IO.Compression; using ?System.Runtime.Serialization.Formatters.Binary; namespace ?WebService1 { ???? /// ? <summary> ???? /// ?Service1?的摘要说明 ???? /// ? </summary> ????[WebService(Namespace? = ? " http://tempuri.org/ " )] ????[WebServiceBinding(ConformsTo? = ?WsiProfiles.BasicProfile1_1)] ????[System.ComponentModel.ToolboxItem( false )] ???? public ? class ?Service1?:?System.Web.Services.WebService ????{ ????????[WebMethod(Description = " 直接返回DataSet对象 " )] ???????? public ?DataSet?GetDataSet() ????????{ ???????????? string ?sql? = ? " select?*?from?Customers " ; ????????????Database?db? = ?DatabaseFactory.CreateDatabase(); ????????????DataSet?ds? = ?db.ExecuteDataSet(CommandType.Text,sql); ???????????? return ?ds; ????????} ????????[WebMethod(Description? = ? " 返回DataSet对象用Binary序列化后的字节数组 " )] ???????? public ? byte []?GetBytes() ????????{ ????????????DataSet?ds? = ?GetDataSet(); ????????????BinaryFormatter?bf? = ? new ?BinaryFormatter(); ????????????MemoryStream?ms? = ? new ?MemoryStream(); ????????????bf.Serialize(ms,?ds); ???????????? byte []?buffer? = ?ms.ToArray(); ???????????? return ?buffer; ????????} ????????[WebMethod(Description? = ? " 返回DataSetSurrogate对象用Binary序列化后的字节数组 " )] ???????? public ? byte []?GetDataSetSurrogateBytes() ????????{ ????????????DataSet?ds? = ?GetDataSet(); ????????????DataSetSurrogate?dss? = ? new ?DataSetSurrogate(ds); ????????????BinaryFormatter?bf? = ? new ?BinaryFormatter(); ????????????MemoryStream?ms? = ? new ?MemoryStream(); ????????????bf.Serialize(ms,dss); ???????????? byte []?buffer? = ?ms.ToArray(); ???????????? return ?buffer; ????????} ????????[WebMethod(Description? = ? " 返回DataSetSurrogate对象用Binary序列化并ZIP压缩后的字节数组 " )] ???????? public ? byte []?GetDataSetSurrogateZipBytes() ????????{ ????????????DataSet?DS? = ?GetDataSet(); ????????????DataSetSurrogate?dss? = ? new ?DataSetSurrogate(DS); ????????????BinaryFormatter?bf? = ? new ?BinaryFormatter(); ????????????MemoryStream?ms? = ? new ?MemoryStream(); ????????????bf.Serialize(ms,?dss); ???????????? byte []?buffer? = ?ms.ToArray(); ???????????? byte []?Zipbuffer? = ?Compress(buffer); ???????????? return ?Zipbuffer; ????????} ???????? // 压缩压缩后的字节数组 ???????? public ? byte []?Compress( byte []?data) ????????{ ????????????MemoryStream?ms? = ? new ?MemoryStream(); ????????????Stream?zipStream? = ? new ?GZipStream(ms,?CompressionMode.Compress,? true ); ????????????zipStream.Write(data,? 0 ,?data.Length); ????????????zipStream.Close(); ????????????ms.Position? = ? 0 ; ???????????? byte []?buffer? = ? new ? byte [ms.Length]; ????????????ms.Read(buffer, int .Parse(ms.Length.ToString())); ???????????? return ?buffer; ????????} ????} } ? 客户端调用WebServices的代码如下: using ?System; using ?System.Collections.Generic; using ?System.Web; using ?System.Web.UI; using ?System.Web.UI.WebControls; using ?WebServicesClient.localhost; using ?System.Data; using ?System.Runtime.Serialization.Formatters.Binary; using ?System.IO; using ?System.Diagnostics; namespace ?WebServicesClient { ???? public ? partial ? class ?_Default?:?System.Web.UI.Page ????{ ????????Service1?s? = ? new ?Service1(); ???????? protected ? void ?Page_Load( object ?sender,?EventArgs?e) ????????{ ????????} ???????? // 直接返回DataSet对象 ???????? protected ? void ?Button1_Click( object ?sender,?EventArgs?e) ????????{ ????????????Stopwatch?sw? = ? new ?Stopwatch(); ????????????sw.Start(); ????????????DataSet?ds? = ?s.GetDataSet(); ????????????GridView1.DataSource? = ?ds.Tables[ 0 ].DefaultView; ????????????GridView1.DataBind(); ????????????sw.Stop(); ????????????Label1.Text? = ? string .Format( " 耗时:{0}毫秒 " ,?sw.ElapsedMilliseconds.ToString()); ????????} ???????? // 得到DataSet对象用Binary序列化后的字节数组 ???????? protected ? void ?Button2_Click( object ?sender,?EventArgs?e) ????????{ ????????????Stopwatch?sw? = ? new ?Stopwatch(); ????????????sw.Start(); ???????????? byte []?buffer? = ?s.GetBytes(); ????????????BinaryFormatter?bf? = ? new ?BinaryFormatter(); ????????????DataSet?ds? = ?bf.Deserialize( new ?MemoryStream(buffer))? as ?DataSet; ????????????GridView1.DataSource? = ?ds.Tables[ 0 ].DefaultView; ????????????GridView1.DataBind(); ????????????sw.Stop(); ????????????Label2.Text? = ? string .Format( " 耗时:{1}毫秒;数据大小:{0} " ,?buffer.Length.ToString(),?sw.ElapsedMilliseconds.ToString()); ????????} ???????? // 得到DataSetSurrogate对象用Binary序列化后的字节数组 ???????? protected ? void ?Button3_Click( object ?sender,?EventArgs?e) ????????{ ????????????Stopwatch?sw? = ? new ?Stopwatch(); ????????????sw.Start(); ???????????? byte []?buffer? = ?s.GetDataSetSurrogateBytes(); ????????????BinaryFormatter?bf? = ? new ?BinaryFormatter(); ????????????DataSetSurrogate?dss? = ?bf.Deserialize( new ?MemoryStream(buffer))? as ?DataSetSurrogate; ????????????DataSet?ds? = ?dss.ConvertToDataSet(); ????????????GridView1.DataSource? = ?ds.Tables[ 0 ].DefaultView; ????????????GridView1.DataBind(); ????????????sw.Stop(); ????????????Label3.Text? = ? string .Format( " 耗时:{1}毫秒;数据大小:{0} " ,?sw.ElapsedMilliseconds.ToString()); ????????} ???????? // 得到DataSetSurrogate对象用Binary序列化并ZIP压缩后的字节数组 ???????? protected ? void ?Button4_Click( object ?sender,?EventArgs?e) ????????{ ????????????Stopwatch?sw? = ? new ?Stopwatch(); ????????????sw.Start(); ???????????? byte []?zipBuffer? = ?s.GetDataSetSurrogateZipBytes(); ???????????? byte []?buffer? = ?UnZip.Decompress(zipBuffer); ????????????BinaryFormatter?bf? = ? new ?BinaryFormatter(); ????????????DataSetSurrogate?dss? = ?bf.Deserialize( new ?MemoryStream(buffer))? as ?DataSetSurrogate; ????????????DataSet?ds? = ?dss.ConvertToDataSet(); ????????????GridView1.DataSource? = ?ds.Tables[ 0 ].DefaultView; ????????????GridView1.DataBind(); ????????????sw.Stop(); ????????????Label4.Text? = ? string .Format( " 耗时:{1}毫秒;数据大小:{0} " ,zipBuffer.Length.ToString(),sw.ElapsedMilliseconds.ToString()); ????????} ????} } ? 测试的结果按照先后顺序如下图所示: 关于测试结果的特殊说明:由于测试环境是在本地,数据量也不是很大,测试的结果离实际情况还不是很接近,如果大家有条件的话,可以测试一下,同时希望把测试的结果提供给大家参考。 最后,为了方便大家,这里还提供了源码下载,下载地址如下: /Files/wlb/WebServiceSummary.rar ? 关于源代码的特殊说明:笔者这里的开发环境为VS2008中文版sp1+SQLServer2008sp1。数据库为Northwind数据库。 ?
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