Socket编程 (异步通讯,解决Tcp粘包) 3
Socket编程 (异步通讯,解决Tcp粘包) - Part3
Socket编程 (异步通讯,解决Tcp粘包)
从上一章的通讯中,我们发现如果使用Tcp连续发送消息会出现消息一起发送过来的情况,这样给我们编程造成一定的问题,给我们的信息解析造成一定的问题。那么这篇文章就将针对以上问题给出解决方案......
问题一般会出现的情况如下,假设我们连续发送两条两天记录("我是liger_zql"):
模拟发送示例:
#region 测试消息发送,并匹配协议
TcpClient client = new TcpClient();
client.AsynConnect();
Console.WriteLine( " 下面将连续发送2条测试消息... " );
Console.ReadKey();
MessageProtocol msgPro;
for ( int i = 0 ; i < 2 ; i++ )
{
msgPro = new MessageProtocol( " 我是liger_zql " );
Console.WriteLine( " 第{0}条:{1} " , i + 1 , msgPro.MessageInfo.Content);
client.AsynSend(msgPro);
}
#endregion
接收端接受两条信息会出现如下三种情况:
1.(1)我是liger_zql(2)我是liger_zql
2.(1)我是liger_zql我是(2)liger_zql
3.(1)我是liger_zql我是liger_zql
通过以上三种情况,显然2、3都不是我们想要的结果。那么如何处理这中情况呢?
解决方案:通过自定义协议...
我们可以以将信息以xml的格式发送出去,列入<protocol>content</protocol>通过正则匹配信息是否完整,如果不完整,我们可以先将本次接受信息缓存接受下一次信息,再次匹配得到相应的结果。
将信息对象转换成一定格式的xml字符串:
/// <summary>
/// 文本信息
/// </summary>
public class MessageInfo
{
public string Content { get ; set ; } // 信息内容
public MessageInfo( string content)
{
this .Content = content;
}
public override string ToString()
{
return String.Format( " <message Content=\"{0}\" /> " , this .Content);
}
}
/// <summary>
/// 文件信息
/// </summary>
public class RequestFile
{
public string Address { get ; set ; } // 发送端Ip
public int Port { get ; set ; } // 端口号
public RequestMode Mode { get ; set ; } // 请求类
public FileObject FileObject { get ; set ; } // 文件详细参数
public RequestFile() { }
public RequestFile(RequestMode mode, FileObject fileobject)
{
this .Mode = mode;
this .FileObject = fileobject;
}
public RequestFile( string address, int port, RequestMode mode, FileObject fileobject)
{
this .Address = address;
this .Port = port;
this .Mode = mode;
this .FileObject = fileobject;
}
public RequestFile( string address, int port, RequestMode mode, string filename, long filelength, int packetsize, long packetcount)
{
this .Address = address;
this .Port = port;
this .Mode = mode;
this .FileObject = new FileObject(filename, filelength, packetsize, packetcount);
}
public override string ToString()
{
StringBuilder sbString = new StringBuilder();
sbString.Append( " <message " );
sbString.Append(String.Format( " Address=\"{0}\" " , Address));
sbString.Append(String.Format( " Port=\"{0}\" " , Port));
sbString.Append(String.Format( " Mode=\"{0}\" " , Mode));
sbString.Append(String.Format( " FileName=\"{0}\" " , FileObject.FileName));
sbString.Append(String.Format( " FileLength=\"{0}\" " , FileObject.FileLength));
sbString.Append(String.Format( " PacketSize=\"{0}\" " , FileObject.PacketSize));
sbString.Append(String.Format( " PacketCount=\"{0}\" " , FileObject.PacketCount));
sbString.Append( " /> " );
return sbString.ToString();
}
}
/// <summary>
/// 订立信息协议
/// </summary>
public class MessageProtocol
{
public MessageType MessageType { get ; set ; }
public MessageInfo MessageInfo { get ; set ; }
public RequestFile RequestFile { get ; set ; }
public MessageProtocol() { }
public MessageProtocol( string msg)
{
MessageType = MessageType.text;
MessageInfo = new MessageInfo(msg);
}
public MessageProtocol(RequestMode mode, FileObject fileobject)
{
MessageType = MessageType.file;
RequestFile = new RequestFile(mode, fileobject);
}
public MessageProtocol( string address, int port, RequestMode mode, FileObject fileobject)
{
MessageType = MessageType.file;
RequestFile = new RequestFile(address, port, mode, fileobject);
}
public override string ToString()
{
StringBuilder sbString = new StringBuilder();
sbString.Append(String.Format( " <protocol Type=\"{0}\"> " , MessageType));
if (MessageType == MessageType.text)
{
sbString.Append(MessageInfo.ToString());
}
else
{
sbString.Append(RequestFile.ToString());
}
sbString.Append( " </protocol> " );
return sbString.ToString();
}
public byte [] ToBytes()
{
return Encoding.UTF8.GetBytes( this .ToString());
}
}
对接收的信息通过正则进行匹配处理:
// 临时缓存
public string temp = string .Empty;
// 匹配协议获取信息
public List<MessageProtocol> HandlerString( string msg)
{
List <MessageProtocol> msgProList = new List<MessageProtocol> ();
if (! String.IsNullOrEmpty(temp))
{
msg = temp + msg;
}
string pattern = " (^<protocol Type=.*?>.*?</protocol>) " ;
if (Regex.IsMatch(msg, pattern))
{
// 匹配协议内容
string match = Regex.Match(msg, pattern).Groups[ 0 ].Value;
// 将匹配的内容添加到集合
msgProList.Add(HandlerObject(match));
temp = string .Empty;
// 截取未匹配字符串,进行下一次匹配
msg = msg.Substring(match.Length);
if (! String.IsNullOrEmpty(msg))
{
msgProList.AddRange(HandlerString(msg));
}
}
else
{
temp = msg;
}
return msgProList;
}
然后将该定义的协议换换成信息对象,通过对象获取自己想要的信息。
// 将已转成协议信息转成对象信息
public MessageProtocol HandlerObject( string protocol)
{
XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(protocol);
XmlNode root = xmldoc.DocumentElement;
XmlNode msgnode = root.SelectSingleNode( " message " );
MessageProtocol msgPro = new MessageProtocol();
if (root.Attributes[ " Type " ].Value == MessageType.text.ToString())
{
msgPro.MessageType = MessageType.text;
msgPro.MessageInfo = new MessageInfo(msgnode.Attributes[ " Content " ].Value);
}
else
{
msgPro.MessageType = MessageType.file;
RequestMode mode = (RequestMode)Enum.Parse( typeof (RequestMode), msgnode.Attributes[ " Mode " ].Value);
FileObject fileobject = new FileObject();
fileobject.FileName = msgnode.Attributes[ " FileName " ].Value;
fileobject.FileLength = Convert.ToInt64(msgnode.Attributes[ " FileLength " ].Value);
fileobject.PacketSize = Convert.ToInt32(msgnode.Attributes[ " PacketSize " ].Value);
fileobject.PacketCount = Convert.ToInt64(msgnode.Attributes[ " PacketCount " ].Value);
msgPro.RequestFile = new RequestFile(
msgnode.Attributes[ " Address " ].Value,
Convert.ToInt32(msgnode.Attributes[ " Port " ].Value),
mode, fileobject);
}
return msgPro;
}
最后运行结果如下:
好了Tcp粘包的问题我们解决了。下一章我们将解决Udp丢包的个人解决方案!
附上源码: SocketProQuests.zip
作者: 曾庆雷 出处: http://HdhCmsTestcnblogs测试数据/zengqinglei 本页版权归作者和博客园所有,欢迎转载,但未经作者同意必须保留此段声明, 且在文章页面明显位置给出原文链接,否则保留追究法律责任的权利
标签: Socket , Tcp异步通讯 , Tcp粘包
作者: Leo_wl
出处: http://HdhCmsTestcnblogs测试数据/Leo_wl/
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。
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