/* 发送发送完毕包 */
public void SendFinish(int numberRandom, int blockRandom, int littleRandom)
{
byte[] buffer = new byte[FinishTip[0]];
// 填充发送完毕包标识
ByteChange.StringToByte(datagramFinish, buffer, FinishTip[1], 4);
// 填充次随机数
ByteChange.IntToByte(buffer, FinishTip[2], numberRandom);
// 填充块随机数
ByteChange.IntToByte(buffer, FinishTip[3], blockRandom);
// 填充小随机数
ByteChange.IntToByte(buffer, FinishTip[4], littleRandom);
// 填充报尾
ByteChange.StringToByte(datagramTail, buffer, FinishTip[5], 4);
try
{
//DatagramPacket packet = new DatagramPacket(buffer, buffer.length, InetAddress.getByName(yourAddress),
// yourPort);
//socket.send(packet);
sendState.AddNumHaveSendBytes(buffer.Length);
udpSendClient.Send(buffer, buffer.Length, host);
}
catch (Exception ex)
{
log.Error(ex.ToString());
//logger.error("{}", ex);
}
}
/*发送分组头确认包*/
public void SendDatagramHeadAck(int numberRandom, int blockRandom)
{
// System.out.println("发送分组头确认包");
byte[] buffer = new byte[HeadAckTip[0]];
//DatagramPacket packet = null;
//填充分组头确认包标识
ByteChange.StringToByte(datagramHeadAck, buffer, HeadAckTip[1], 4);
//填充次随机数
ByteChange.IntToByte(buffer, HeadAckTip[2], numberRandom);
//填充块随机数
ByteChange.IntToByte(buffer, HeadAckTip[3], blockRandom);
//填充报尾
ByteChange.StringToByte(datagramTail, buffer, HeadAckTip[4], 4);
//填充完成,发送报文
try
{
//packet = new DatagramPacket(buffer, buffer.length, InetAddress.getByName(yourAddress), yourPort);
//socket.send(packet);
udpReceiveClient.Send(buffer, buffer.Length, host);
}
catch (Exception ex)
{
log.Error(ex.ToString());
//Logger.getLogger(Receive.class.getName()).log(Level.SEVERE, null, ex);
}
}
/*接收开始传输包*/
public int ReceiveStart()
{
//DatagramPacket sendPacket = null, receivePacket = null;
//用于发送开始确认包
byte[] sendBuffer = new byte[StartAckTip[0]];
//用于接收开始传输包
byte[] receiveBuffer = new byte[FilePropertyTip[0]];
try
{
udpReceiveClient.Client.ReceiveTimeout = 0;
}
catch (Exception e) {
log.Error("ReceiveStart", e);
}
while (true)
{
try
{
//socket.receive(receivePacket);
receiveBuffer = udpReceiveClient.Receive(ref host);
receiveState.AddHaveReceiveBytes(receiveBuffer.Length);
//检查标识
String str = Encoding.Default.GetString(receiveBuffer, StartTip[1], 4);
if (!datagramStart.Equals(str))
{
continue;
}
//获取次随机数
int numberRandom = ByteChange.ByteToInt(receiveBuffer, StartTip[2]);
SendStartAck(numberRandom);
// System.out.println("接收到开始传输包");
return(numberRandom);
}
catch (Exception ex)
{
// Logger.getLogger(ReceiveLittle.class.getName()).log(Level.SEVERE, null, ex);
//logger.error("{}", ex);
//MessageBox.Show(ex.ToString());
log.Error(ex.ToString());
}
}
}
/* 发送分组包,无回送 */
public void SendDatagramData(int numberRandom, int blockRandom, int serial, byte[] buffer, int start, int length)
{
//DatagramPacket packet = null;
byte[] b = new byte[DataTip[0]];
// System.out.println("发送分组,序列号:" + serial);
//assert length <= dataLength : "Error[发送分组包]:数据长度大于dataLength!";
if (length > dataLength)
{
throw new Exception("Error[发送分组包]:数据长度大于dataLength!");
}
// 填充分组包标识
ByteChange.StringToByte(datagramData, b, DataTip[1], 4);
// 填充次随机数
ByteChange.IntToByte(b, DataTip[2], numberRandom);
// 填充块随机数
ByteChange.IntToByte(b, DataTip[3], blockRandom);
// 填充分组序号
ByteChange.ShortToByte(b, DataTip[4], (short)serial);
// 填充数据长度
ByteChange.ShortToByte(b, DataTip[5], (short)length);
// 填充等传输的数据
for (int i = 0; i < length; i++)
{
b[i + DataTip[6]] = buffer[i + start];
}
// 填充报尾
ByteChange.StringToByte(datagramTail, b, DataTip[7], 4);
// 填充完毕,发送
try
{
//packet = new DatagramPacket(b, b.length, InetAddress.getByName(yourAddress), yourPort);
//socket.send(packet);
sendState.AddNumHaveSendBytes(b.Length);
udpSendClient.Send(b, b.Length, host);
}
catch (Exception ex)
{
log.Error(ex.ToString());
//logger.error("{}", ex);
}
}
/*发送开始确认包*/
public void SendStartAck(int numberRandom)
{
//DatagramPacket sendPacket = null;
byte[] sendBuffer = new byte[StartAckTip[0]];
//填充标识
ByteChange.StringToByte(datagramStartAck, sendBuffer, StartAckTip[1], 4);
//填充次随机数
ByteChange.IntToByte(sendBuffer, StartAckTip[2], numberRandom);
//填充报尾
ByteChange.StringToByte(datagramTail, sendBuffer, StartAckTip[3], 4);
try
{
udpReceiveClient.Send(sendBuffer, sendBuffer.Length, host);
}
catch (Exception ex)
{
// Logger.getLogger(ReceiveLittle.class.getName()).log(Level.SEVERE, null, ex);
//logger.error("{}", ex);
log.Error(ex.ToString());
}
}
/* 发送结束传输包 */
public void SendOver(int numberRandom)
{
// 设定接收超时1ms
udpSendClient.Client.ReceiveTimeout = sendState.WaitTime;
// 生成传输结束包
//DatagramPacket packetOver, packetOverAck;
byte[] overBuffer = new byte[StopTip[0]];
byte[] overAckBuffer = new byte[StopAckTip[0]];
// 填充标识
ByteChange.StringToByte(datagramStop, overBuffer, StopTip[1], datagramStop.Length);
// 填充次随机数
ByteChange.IntToByte(overBuffer, StopTip[2], numberRandom);
// 填充报尾
ByteChange.StringToByte(datagramTail, overBuffer, StopTip[3], datagramTail.Length);
try
{
while (true)
{
try
{
udpSendClient.Send(overBuffer, overBuffer.Length, host);
// sendState.addHaveSendBytes(packetOver.getLength());
sendState.AddNumHaveSendBytes(overAckBuffer.Length);
ByteChange.CleanByte(overAckBuffer);
overAckBuffer = udpSendClient.Receive(ref host);
// 检查ACK标识
String str = Encoding.Default.GetString(overAckBuffer, StopAckTip[1], 4);
if (!datagramStopAck.Equals(str))
{
continue;
}
// 检查次随机数
int num = ByteChange.ByteToInt(overAckBuffer, StopAckTip[2]);
if (num != numberRandom)
{
continue;
}
break;
}
catch (SocketException ex)
{
if (ex.ErrorCode == 10060)
{
continue;
}
//MessageBox.Show(ex.ToString());
//if (ex is TimeoutException)
//{
// continue;
// // 接收超时,则继续循环
//}
//if(ex is SocketException)
//{
// continue;
//}
}
}
}
catch (Exception ex)
{
//logger.error("{}", ex);
log.Error(ex.ToString());
}
}
/* 接收请求重发包 */
/* 返回接收方是否接收完毕 */
public bool GetDatagramReq(int numberRandom, int blockRandom, int littleRandom, bool[] sendTip)
{
//log.Info("GetDatagramReq进入");
// 首先,设置接收超时5ms
//DatagramPacket packetReq = null;
// 由于请求重发包发送的是需要重发的分组
// 所以,先将成功发送标记全部置true,再根据
for (int i = 0; i < sendTip.Length; i++)
{
sendTip[i] = true;
}
// 请求重发包将发送失败的置false
byte[] buffer = new byte[ReqAgainTip[0]];
bool canSendFinish = true;
while (true)
{
try
{
if (canSendFinish)
{
udpSendClient.Client.ReceiveTimeout = sendState.WaitTime;
SendFinish(numberRandom, blockRandom, littleRandom);
}
ByteChange.CleanByte(buffer);
buffer = udpSendClient.Receive(ref host);
// 如果接收到数据包,不管是否正确,下一轮都不能发未接收请求重发包
canSendFinish = false;
// 对接收到的请法求重发包进行解析
// 检证是不是请求重发包
String s = Encoding.Default.GetString(buffer, ReqAgainTip[1], 4);
if (!datagramReqAgain.Equals(s))
{
continue;
}
// 匹配次随机数
int r = ByteChange.ByteToInt(buffer, ReqAgainTip[2]);
if (r != numberRandom)
{
continue;
}
// 匹配块随机数
r = ByteChange.ByteToInt(buffer, ReqAgainTip[3]);
if (r != blockRandom)
{
continue;
}
// //验证该包是否完整
// s=new String(buffer,1014,4);
// if(!s.equals(datagramTail)){
// continue;
// }
// 验证此请求重发包的小随机数是否与本次发送的"发送完毕包"相同
r = ByteChange.ByteToInt(buffer, ReqAgainTip[4]);
if (r != littleRandom)
{
continue;
}
// 验证完毕,提取请求重发的分组
// 提取数据长度
int length = ByteChange.ByteToShort(buffer, ReqAgainTip[5]);
// 如果数据长度是0,验证一下数据完整性,如果完整,则返回数据接收完毕
if (length == 0)
{
//s = new String(buffer, ReqAgainTip[5] + 2, 4);
s = Encoding.Default.GetString(buffer, ReqAgainTip[5] + 2, 4);
//if (s.equals(datagramTail))
if (datagramTail.Equals(s))
{
// 数据完整,返回
//log.Info("GetDatagramReq退出true");
return(true);
}
else
{
// 数据不完整,此包无效,继续循环
continue;
}
}
else
{
sendState.NumResendPackets = 0;
for (int i = 0; i < length; i++)
{
int tip = ByteChange.ByteToShort(buffer, i * 2 + ReqAgainTip[6]);
sendTip[tip] = false;
sendState.AddNumResendPackets();
}
//log.Info("GetDatagramReq退出");
break;
}
}
catch (SocketException ex)
{
// Logger.getLogger(Send.class.getName()).log(Level.SEVERE,null, ex);
// 如果是接收超时,那么下一次循环就应该发送"发送完毕包"
if (ex.ErrorCode == 10060)
{
canSendFinish = true;
int time = sendState.WaitTime;
if (time <= 1800 && time > 0)
{
sendState.WaitTime = (time + 10);//延迟时间+10
}
}
}
}
return(false);
}
/* 发送分组头 */
public void SendDatagramHead(int numberRandom, int blockRandom, int number)
{
//log.Info("SendDatagramHead进入");
byte[] buffer = new byte[HeadTip[0]];
// 填充分组头标识
ByteChange.StringToByte(datagramHead, buffer, HeadTip[1], 4);
// 填充次随机数
ByteChange.IntToByte(buffer, HeadTip[2], numberRandom);
// 填充块随机数
ByteChange.IntToByte(buffer, HeadTip[3], blockRandom);
// 写入数组数量
//assert number <= groupNum : "分组数量超过500";
if (number > groupNum)
{
throw new Exception("分组数量超过500");
}
ByteChange.ShortToByte(buffer, HeadTip[4], (short)number);
// 填充报尾标识
ByteChange.StringToByte(datagramTail, buffer, HeadTip[5], 4);
// 发送分组头
// 发送后接收报头确认报,接收超时或者接收的不匹配则重发分组头
bool canSendHead = true;
while (true)
{
try
{
if (canSendHead)
{
udpSendClient.Client.ReceiveTimeout = sendState.WaitTime;
udpSendClient.Send(buffer, buffer.Length, host);
sendState.AddNumHaveSendBytes(buffer.Length);
}
byte[] c = new byte[HeadAckTip[0]];
ByteChange.CleanByte(c);
c = udpSendClient.Receive(ref host);
// 只要接收到数据包,不论是不正确,下次循环就不能发送头
canSendHead = false;
// 进行检查
// 1.检查其是否是分组头确认包
//String s = new String(c, HeadAckTip[1], 4);
String s = Encoding.Default.GetString(c, HeadAckTip[1], 4);
//if (!s.equals(datagramHeadAck))
if (!datagramHeadAck.Equals(s))
{
continue;
}
// 2.检查其次随机数,是否与自己的匹配
int r = ByteChange.ByteToInt(c, HeadAckTip[2]);
if (r != numberRandom)
{
continue;
}
// 3.检查其块随机数
r = ByteChange.ByteToInt(c, HeadAckTip[3]);
if (r != blockRandom)
{
continue;
}
// 所有检查均正确,发送成功,返回
int time = sendState.WaitTime;
if (time <= 2000 && time >= 4)
{
sendState.WaitTime = (time / 2);//延迟时间翻倍
}
//logger.info("WaitTime={}",sendState.getWaitTime());
//log.Info("SendDatagramHead退出");
break;
}
catch (SocketException ex)
{
//MessageBox.Show(ex.ToString());
// Logger.getLogger(Send.class.getName()).log(Level.SEVERE,
// null, ex);
// 如果是接收超时,则一下次循环的时候,要先发送头
if (ex.ErrorCode == 10060)
{
canSendHead = true;
int time = sendState.WaitTime;
if (time <= 1800 && time > 0)
{
sendState.WaitTime = (time + 10);//延迟时间+10
}
// logger.info("WaitTime={}",sendState.getWaitTime());
}
//if (ex is TimeoutException)
//{
// canSendHead = true;
//}
//if(ex is SocketException)
//{
// canSendHead = true;
//}
//canSendHead = true;
}
}
}
/* 发送开始传输包 */
public void SendStart(int numberRandom)
{
//log.Info("SendStart进入");
byte[] sendBuffer = new byte[StartTip[0]];
byte[] receiveBuffer = new byte[StartAckTip[0]];
// 填充开始传输包
ByteChange.StringToByte(datagramStart, sendBuffer, StartTip[1], 4);
ByteChange.IntToByte(sendBuffer, StartTip[2], numberRandom);
ByteChange.StringToByte(datagramTail, sendBuffer, StartTip[3], 4);
// 设置超时1ms及初始化数据包
bool canSend = true;
while (true)
{
try
{
if (canSend)
{
udpSendClient.Client.ReceiveTimeout = sendState.WaitTime;
udpSendClient.Send(sendBuffer, sendBuffer.Length, host);
sendState.AddNumHaveSendBytes(sendBuffer.Length);
}
receiveBuffer = udpSendClient.Receive(ref host);
// 如果接收到数据包,无论如何,下一次都不能发送
canSend = false;
// 判断标识
String str = Encoding.Default.GetString(receiveBuffer, StartAckTip[1], 4);
if (!datagramStartAck.Equals(str))
{
continue;
}
// 判断次随机数
int num = ByteChange.ByteToInt(receiveBuffer, StartAckTip[2]);
if (num != numberRandom)
{
continue;
}
// 否则接收成功,退出循环
int time = sendState.WaitTime;
if (time <= 2000 && time >= 4)
{
sendState.WaitTime = time / 2;//延迟时间减半
}
// logger.info("WaitTime={}",sendState.getWaitTime());
//log.Info("SendStart退出");
break;
}
catch (SocketException e)
{
if (e.ErrorCode == 10060)
{
canSend = true;
int time = sendState.WaitTime;
if (time <= 1800 && time > 0)
{
sendState.WaitTime = (time + 10);//延迟时间+10
}
}
//MessageBox.Show(e.ToString());
//if (e is TimeoutException)
//{
// canSend = true;
// //int time = sendState.getWaitTime();
// //if (time <= 1800 && time > 0)
// //{
// // sendState.setWaitTime(time + 10);//延迟时间+10
// //}
// // logger.info("WaitTime={}",sendState.getWaitTime());
//}
//if(e is SocketException)
//{
//}
}
}
// System.out.println("开始发送包发送完毕退出");
}
/*发送传输结束确认包*/
public void SendOverAck(int numberRandom)
{
//DatagramPacket packetOverAck = null, packetOver = null;
byte[] sendBuffer = new byte[StopAckTip[0]];
byte[] receiveBuffer = new byte[StopTip[0]];
//设置接收超时1000ms
try
{
//socket.setSoTimeout(1000);
udpReceiveClient.Client.ReceiveTimeout = 1000;
/*填充结束确认包*/
//填充确认包标识
ByteChange.StringToByte(datagramStopAck, sendBuffer, StopAckTip[1], 4);
//填充次随机数
ByteChange.IntToByte(sendBuffer, StopAckTip[2], numberRandom);
//填充报尾
ByteChange.StringToByte(datagramTail, sendBuffer, StopAckTip[3], 4);
/*填充完毕*/
//packetOverAck = new DatagramPacket(sendBuffer, sendBuffer.length, InetAddress.getByName(yourAddress), yourPort);
//packetOver = new DatagramPacket(receiveBuffer, receiveBuffer.length);
}
catch (Exception ex)
{
log.Error(ex.ToString());
// Logger.getLogger(ReceiveLittle.class.getName()).log(Level.SEVERE, null, ex);
//logger.error("{}", ex);
}
bool canSendAck = true;
while (true)
{
try
{
if (canSendAck)
{
//socket.send(packetOverAck);
udpReceiveClient.Send(sendBuffer, sendBuffer.Length, host);
}
ByteChange.CleanByte(receiveBuffer);
//socket.receive(packetOver);
receiveBuffer = udpReceiveClient.Receive(ref host);
//receiveState.addHaveReceiveBytes(packetOver.getLength());
// System.out.println("Over:收到包,IP"+packetOver.getAddress());
//如果接收到传输结束包,就继续循环
//String str = new String(receiveBuffer, StopTip[1], 4);
// System.out.println("Over:收到包,str"+str);
String str = Encoding.Default.GetString(receiveBuffer, StopTip[1], 4);
//if (str.equals(datagramStop))
if (datagramStop.Equals(str))
{
//检查次随机数
int num = ByteChange.ByteToInt(receiveBuffer, StopTip[2]);
if (num == numberRandom)
{
canSendAck = true;
continue;
}
}
//如果收到开始传输包,并且其次随机数与这次的不一样,则退出
//if (str.equals(datagramStart))
if (datagramStart.Equals(str))
{
//检查次随机数
if (ByteChange.ByteToInt(receiveBuffer, StartTip[2]) != numberRandom)
{
break;
}
}
//如果是其他包,也继续循环,但是一下轮不发送确认包
canSendAck = false;
continue;
}
catch (Exception e)
{
if (e is TimeoutException)
{
//如果接收超时,则退出循环
// System.out.println("接收超时");
break;
}
if (e is SocketException)
{
break;
}
}
}
}
/*接收一个分组*/
/*返回值说明:
* 1.如果正常接收,返回读取数据的长度
* 2.如果接收超时,返回-1 //此句已经无效
* 3.如果接收到本分组的分组头,返回-2
* 4.如果接收到新的发送完毕包,返回-3
* 5.如果接收到上次的发送完毕包,返回-4
* 6.其他情况,返回-5
*/
//此函数只用于接收,不发送任何信息.遇到错误,只是将错误标识返回.
//如果接收到的是分组包,将其存入buffer中相应位置,返回数据的长度
public int GetDatagramData(int numberRandom, int random, byte[] buffer, bool[] receiveTip, int[] startTip)
{
//设置不接收超时
//try
//{
// socket.setSoTimeout(0);
//}
//catch (SocketException ex)
//{
// // Logger.getLogger(ReceiveLittle.class.getName()).log(Level.SEVERE, null, ex);
// logger.error("{}", ex);
//}
udpReceiveClient.Client.ReceiveTimeout = 0;
byte[] receiveBuffer = new byte[DataTip[0]];
//DatagramPacket packet = new DatagramPacket(receiveBuffer, receiveBuffer.length);
try
{
ByteChange.CleanByte(receiveBuffer);
//socket.receive(packet);
receiveBuffer = udpReceiveClient.Receive(ref host);
//receiveState.addHaveReceiveBytes(packet.getLength());
//就算收到未接收请求重发包,有意义的随机数也应该是与本分组随机数相同的
//次随机数
if (ByteChange.ByteToInt(receiveBuffer, DataTip[2]) != numberRandom)
{
return(-5);
}
//所以,先判断块随机数
int r = ByteChange.ByteToInt(receiveBuffer, DataTip[3]);
if (r != random)
{
return(-5);
}
//判断分组标识
//String s = new String(receiveBuffer, DataTip[1], 4);
String s = Encoding.Default.GetString(receiveBuffer, DataTip[1], 4);
//if (!s.equals(datagramData))
if (!datagramData.Equals(s))
{
//如果此包不是分组包
//判断其是否是本分组的分组头.由于随机数已经匹配,所以,只需要判断标识
//if (s.equals(datagramHead))
if (datagramHead.Equals(s))
{
return(-2);
}
//再判断其是否是发送完毕包
//if (s.equals(datagramFinish))
if (datagramFinish.Equals(s))
{
//先判断,是否是新的发送完毕包
r = ByteChange.ByteToInt(receiveBuffer, FinishTip[4]);
if (!littleRandomStack.InIt(r))
{
littleRandomStack.Add(r);
return(-3);
}
//如果是上次的发送完毕包
int r2 = littleRandomStack.GetLast();
if (r2 != -1 && r2 == r)
{
return(-4);
}
}
//否则,返回-5
return(-5);
}
//至此已经是分组包了,先判断一下包的完整性
//因为,如果包是不完整的,它的数据就是有问题的,是不能接收的
//s = new String(receiveBuffer, DataTip[7], 4);
s = Encoding.Default.GetString(receiveBuffer, DataTip[7], 4);
//if (!s.equals(datagramTail))
if (!datagramTail.Equals(s))
{
return(-5);
}
//包是完整的,获取包的序号
int serial = ByteChange.ByteToShort(receiveBuffer, DataTip[4]);
int number = ByteChange.ByteToShort(receiveBuffer, DataTip[5]);
//如果该序列的包未被正确接收
if (!receiveTip[serial])
{
receiveTip[serial] = true;
for (int i = 0; i < number; i++)
{
buffer[i + startTip[serial]] = receiveBuffer[i + DataTip[6]];
}
return(number);
}
//如果已经被正确接收了,则丢弃该包
else
{
return(-5);
}
}
catch (Exception ex)
{
//Logger.getLogger(Receive.class.getName()).log(Level.SEVERE, null, ex);
if (ex is TimeoutException)
{
return(-1);
}
if (ex is SocketException)
{
return(-1);
}
return(-5);
}
}
/*发送请求重发包*/
public bool SendDatagramReqAgain(int numberRandom, int blockRandom, int littleRandom, bool[] receiveTip)
{
//先判断是否全部接收成功
bool success = true;
for (int i = 0; i < receiveTip.Length; i++)
{
if (receiveTip[i] == false)
{
success = false;
break;
}
}
byte[] buffer = new byte[ReqAgainTip[0]];
//DatagramPacket packet;
//填充请求重发包标识
ByteChange.StringToByte(datagramReqAgain, buffer, ReqAgainTip[1], 4);
//填充次随机数
ByteChange.IntToByte(buffer, ReqAgainTip[2], numberRandom);
//填充块随机数
ByteChange.IntToByte(buffer, ReqAgainTip[3], blockRandom);
//填充小随机数
ByteChange.IntToByte(buffer, ReqAgainTip[4], littleRandom);
//填充数据长度
if (success)
{
//全部成功接收,所以应该发送的是0请求重发包
ByteChange.ShortToByte(buffer, ReqAgainTip[5], (short)0);
//由于长度为0,所以没有数据,直接填充报尾
ByteChange.StringToByte(datagramTail, buffer, ReqAgainTip[6], 4);
// System.out.println("未重传数据包");
}
else
{
//解析receiveTip,遇到false就将下标存入buffer
int length = 0;
// int reqAgainCount = 0;
//receiveState.setNumReceivePackets(receiveTip.length);
//receiveState.setNumResendPackets(0);
for (int i = 0; i < receiveTip.Length; i++)
{
if (receiveTip[i] == false)
{
ByteChange.ShortToByte(buffer, ReqAgainTip[6] + length * 2, (short)i);
length++;
//receiveState.addNumResendPackets();
}
}
// System.out.println("重传数据包数："+reqAgainCount+"丢包率："+(float)reqAgainCount/receiveTip.length);
//填充数据长度
ByteChange.ShortToByte(buffer, ReqAgainTip[5], (short)length);
//填充报尾
ByteChange.StringToByte(datagramTail, buffer, ReqAgainTip[7], 4);
}
try
{
//填充完毕,发送
if (success)
{
//packet = new DatagramPacket(buffer, ReqAgainTip[6] + 4, InetAddress.getByName(yourAddress), yourPort);
udpReceiveClient.Send(buffer, ReqAgainTip[6] + 4, host);
//buffer.CopyTo(lastReqAgainBuffer, ReqAgainTip[6] + 4);
lastReqAgainBuffer.Clear();
lastReqAgainBuffer.AddRange(buffer);
}
else
{
//packet = new DatagramPacket(buffer, ReqAgainTip[0], InetAddress.getByName(yourAddress), yourPort);
udpReceiveClient.Send(buffer, ReqAgainTip[0], host);
lastReqAgainBuffer.Clear();
lastReqAgainBuffer.AddRange(buffer);
//buffer.CopyTo(lastReqAgainBuffer, ReqAgainTip[0] + 4);
}
//lastReqAgainBuffer = buffer;
//lastReqAgain = packet;
////System.out.println("发送请求重发包,长度"+lastReqAgain.getLength());
//socket.send(packet);
}
catch (Exception ex)
{
log.Error(ex.ToString());
// Logger.getLogger(ReceiveLittle.class.getName()).log(Level.SEVERE, null, ex);
//logger.error("{}", ex);
}
return(success);
}
/*接收分组头*/
//1.不接收超时. 2.接收成功,会调用发送分组头确认包
public Rdh_return ReceiveDatagramHead(int numberRandom)
{
byte[] buffer = new byte[FilePropertyTip[0]];
//DatagramPacket packet = null;
Rdh_return rdh = new Rdh_return();
//设置不接收超时
udpReceiveClient.Client.ReceiveTimeout = 0;
while (true)
{
try
{
//packet = new DatagramPacket(buffer, buffer.length);//,InetAddress.getByName(yourAddress),yourPort
ByteChange.CleanByte(buffer);
//socket.receive(packet);
//receiveState.addHaveReceiveBytes(packet.getLength());
buffer = udpReceiveClient.Receive(ref host);
//检查分组头标识
//String str = new String(buffer, HeadTip[1], 4);
String str = Encoding.Default.GetString(buffer, HeadTip[1], 4);
//if (!str.equals(datagramHead))
if (!datagramHead.Equals(str))
{
/*既然不是分组头,重新接收是肯定的.只不过,有些情况,需要处理一下再重新接收*/
//如果是开始传输包
//if (str.equals(datagramStart))
if (datagramStart.Equals(str))
{
int num = ByteChange.ByteToInt(buffer, StartTip[2]);
if (num == numberRandom)
{
SendStartAck(numberRandom);
// System.out.println("在分组头中接收到开始传输包");
continue;
}
}
//如果是发送完毕包
//if (str.equals(datagramFinish))
if (datagramFinish.Equals(str))
{
//先检其次随机数
if (ByteChange.ByteToInt(buffer, FinishTip[2]) == numberRandom)
{
//检验是不是上一次的发送完毕包
//如果是的,说明上次发的0请求重发包没发成功
//先检查其块随机数是不是上一次的
if (randomStack.GetLast() != -1 && ByteChange.ByteToInt(buffer, FinishTip[3]) == randomStack.GetLast())
{
//再检查其小随机数,是不是上次的(即最后一次发过来的)
if (littleRandomStack != null)
{
//如果littelRandomStack是null,说明这是第一次接收分组头,当然不可能要重发
if (littleRandomStack.GetLast() == ByteChange.ByteToInt(buffer, FinishTip[4]))
{
//如果小随机数也匹配,则发送上次的0请求重发包
if (lastReqAgainBuffer != null)
{
//socket.send(lastReqAgain);
udpReceiveClient.Send(lastReqAgainBuffer.ToArray(), lastReqAgainBuffer.Count, host);
}
}
}
}
}
}
//如果是传输结束包,则将0分组数量填充入rdh,然后返回
//if (str.equals(datagramStop))
if (datagramStop.Equals(str))
{
rdh.Number = 0;
return(rdh);
}
continue;
}
//检查该包是否完整
//str = new String(buffer, HeadTip[5], 4);
str = Encoding.Default.GetString(buffer, HeadTip[5], 4);
//if (!str.equals(datagramTail))
if (!datagramTail.Equals(str))
{
continue;
}
//检查完毕,获取随机数
rdh.Random = ByteChange.ByteToInt(buffer, HeadTip[3]);
//获取分组数量
rdh.Number = ByteChange.ByteToShort(buffer, HeadTip[4]);
SendDatagramHeadAck(numberRandom, rdh.Random);
break;
}
catch (Exception ex)
{
//MessageBox.Show(ex.ToString());
// Logger.getLogger(ReceiveLittle.class.getName()).log(Level.SEVERE, null, ex);
//logger.error("{}", ex);
}
}
return(rdh);
}
