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。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |