webservice用於大資料量傳輸的處理
1. 直接返回DataSet物件
特點：通常元件化的處理機制，不加任何修飾及
處理；
優點：程式碼精減、易於處理，小資料量處理較快；
缺點：大資料量的傳遞處理慢，消耗網路資源；
建議：當應用系統在內網、專網（區域網）的應用
時，或外網（廣域網）且資料量在KB級時的
應用時，採用此種模式。
2.返回DataSet物件用Binary序列化後的位元組陣列
特點：位元組陣列流的處理模式；
優點：易於處理，可以中文內容起到加密作用；
缺點：大資料量的傳遞處理慢，較消耗網路資源；
建議：當系統需要進行較大資料交換時採用。
3.返回DataSetSurrogate物件用Binary序列化後的位元組陣列
特點：微軟提供的開源元件；
下載地址 http://support.microsoft.com/kb/829740/zh-cn
優點：易於處理，可以中文內容起到加密作用；
缺點：大資料量的傳遞處理慢，較消耗網路資源；
建議：當系統需要傳輸中文資料或需要加密時採用此種方式
4.返回DataSetSurrogate物件用Binary序列化並Zip壓縮後的位元組陣列
特點：對位元組流陣列進行壓縮後傳遞；
優點：當資料量大時，效能提高效果明顯，
壓縮比例大；
缺點：相比第三方元件，壓縮比例還有待提高；
建議：當系統需要進行大資料量網路資料傳遞時，
建議採用此種可靠、高效、免費的方法。
測試用例：SqlServer2000資料庫，資料量大小40000行，
欄位數１０個，結果如下：
|
使用方法 |
用時(秒） |
資料量(Byte) |
大小 百分比(%) |
|
直接返回DataSet |
12.625 |
19629414 |
100% |
|
返回二進位制序列化後DataSet |
9.712 |
12049645 |
61.38% |
|
返回轉化DataSetSurrogate的DataSet 並且二進位制序列化後 |
7.943 |
5138990 |
26.18% |
|
返回轉化DataSetSurrogate的DataSet 並且二進位制序列化後使用zip壓縮 |
7.619 |
978033 |
4.98% |
原始碼:
using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
using System.IO;
using System.IO.Compression;
using System.Data.SqlClient;
using System.Runtime.Serialization.Formatters.Binary;
namespace DataSetWebService
{
/// <summary>
/// Service1 的摘要說明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
public class DataSetService : System.Web.Services.WebService
{
[WebMethod(Description="直接返回DataSet物件")]
public DataSet GetDataSet()
{
//http://www.dzbsoft.com XT_TEXT
string sql = "select * from XT_TEXT";
SqlConnection conn = new SqlConnection("Server=60.28.25.58;DataBase=s168593;user id=s168593;password=h0y+FeC*;");
conn.Open();
SqlDataAdapter dataAd = new SqlDataAdapter(sql, conn);
DataSet DS = new DataSet("XT_TEXT");
dataAd.Fill(DS);
conn.Close();
return DS;
}
[WebMethod(Description = "返回DataSet物件用Binary序列化後的位元組陣列")]
public byte[] GetDataSetBytes()
{
DataSet DS = GetDataSet();
BinaryFormatter ser = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
ser.Serialize(ms, DS);
byte[] buffer = ms.ToArray();
return buffer;
}
[WebMethod(Description = "返回DataSetSurrogate物件用Binary序列化後的位元組陣列")]
public byte[] GetDataSetSurrogateBytes()
{
DataSet DS = GetDataSet();
DataSetSurrogate dss = new DataSetSurrogate(DS);
BinaryFormatter ser = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
ser.Serialize(ms, dss);
byte[] buffer = ms.ToArray();
return buffer;
}
[WebMethod(Description = "返回DataSetSurrogate物件用Binary序列化並ZIP壓縮後的位元組陣列")]
public byte[] GetDataSetSurrogateZipBytes()
{
DataSet DS = GetDataSet();
DataSetSurrogate dss = new DataSetSurrogate(DS);
BinaryFormatter ser = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
ser.Serialize(ms, dss);
byte[] buffer = ms.ToArray();
byte[] Zipbuffer = Compress(buffer);
return Zipbuffer;
}
public byte[] Compress(byte[] data)
{
MemoryStream ms = new MemoryStream();
Stream zipStream = null;
zipStream = new GZipStream(ms, CompressionMode.Compress, true);
zipStream.Write(data, 0, data.Length);
zipStream.Close();
ms.Position = 0;
byte[] compressed_data = new byte[ms.Length];
ms.Read(compressed_data, 0, int.Parse(ms.Length.ToString()));
return compressed_data;
}
}
}
客戶端呼叫:C/S
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.IO.Compression;
using System.Data.SqlClient;
using System.Runtime.Serialization.Formatters.Binary;
namespace Test
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void BindDataSet(DataSet DS)
{
this.dataGridView1.DataSource = DS.Tables[0];
}
private void button1_Click(object sender, EventArgs e)
{
com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
DateTime dtBegin = DateTime.Now;
DataSet DS = ds.GetDataSet();
this.label1.Text = string.Format("耗時：{0}", DateTime.Now - dtBegin);
BindDataSet(DS);
}
private void button2_Click(object sender, EventArgs e)
{
com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
DateTime dtBegin = DateTime.Now;
byte[] buffer = ds.GetDataSetBytes();
DataSet DS = ds.GetDataSet();
BinaryFormatter ser = new BinaryFormatter();
DataSet dataset = ser.Deserialize(new MemoryStream(buffer)) as DataSet;
this.label2.Text = string.Format("耗時：{0}", DateTime.Now - dtBegin + " " + buffer.Length.ToString());
BindDataSet(DS);
}
private void button3_Click(object sender, EventArgs e)
{
com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
DateTime dtBegin = DateTime.Now;
byte[] buffer = ds.GetDataSetSurrogateBytes();
BinaryFormatter ser = new BinaryFormatter();
DataSet DS = ds.GetDataSet();
DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
DataSet dataset = dss.ConvertToDataSet();
this.label3.Text = string.Format("耗時：{0}", DateTime.Now - dtBegin + " " + buffer.Length.ToString());
BindDataSet(DS);
}
private void button4_Click(object sender, EventArgs e)
{
com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
DateTime dtBegin = DateTime.Now;
byte[] zipBuffer = ds.GetDataSetSurrogateZipBytes();
byte[] buffer = UnZipClass.Decompress(zipBuffer);
BinaryFormatter ser = new BinaryFormatter();
DataSet DS = ds.GetDataSet();
DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
DataSet dataset = dss.ConvertToDataSet();
this.label4.Text = string.Format("耗時：{0}", DateTime.Now - dtBegin + " " + zipBuffer.Length.ToString());
BindDataSet(DS);
}
}
}
UnZipClass.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.IO.Compression;
namespace Test
{
public static class UnZipClass
{
/// <summary>
/// Decompresses the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public static byte[] Decompress(byte[] data)
{
try
{
MemoryStream ms = new MemoryStream(data);
Stream zipStream = null;
zipStream = new GZipStream(ms, CompressionMode.Decompress);
byte[] dc_data = null;
dc_data = EtractBytesFormStream(zipStream, data.Length);
return dc_data;
}
catch
{
return null;
}
}
public static byte[] EtractBytesFormStream(Stream zipStream, int dataBlock)
{
try
{
byte[] data = null;
int totalBytesRead = 0;
while (true)
{
Array.Resize(ref data, totalBytesRead + dataBlock + 1);
int bytesRead = zipStream.Read(data, totalBytesRead, dataBlock);
if (bytesRead == 0)
{
break;
}
totalBytesRead += bytesRead;
}
Array.Resize(ref data, totalBytesRead);
return data;
}
catch
{
return null;
}
}
}
}