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常用WebServices返回数据的4种方法比较

发布时间:2020-12-17 02:31:32 所属栏目:安全 来源:网络整理
导读: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。

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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