後臺代碼：
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json;
using System.Reflection;
using client;
namespace client
{
public class WebClient
{
private static Socket listener;
private static Hashtable ht;
private static string esdStr = string.Format("select * From esd");
private static DataTable db_esd = SQLHelper.ExecuteDataTable(esdStr);
private class Esd
{
public System.Guid Esd_ID { get; set; }
public string Esd_Num { get; set; }
public string Esd_Name { get; set; }
public string Esd_Area { get; set; }
public string Esd_Status { get; set; }
public Nullable<System.DateTime> Esd_UpTime { get; set; }
public string Esd_CalArea { get; set; }
public string Esd_CrNate { get; set; }
}
private static List<Esd> esd_list = CommonTransafer.ToList<Esd>(db_esd);
public void Start()
{
int port = 9002;//監聽端口爲1818端口
ht = new Hashtable();//用於存放客戶端的連接socket
byte[] buffer = new byte[1024];
var localEP = new IPEndPoint(IPAddress.Any, port);
listener = new Socket(localEP.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
try
{
listener.Bind(localEP);
listener.Listen(100);
Console.WriteLine("等待客戶端連接....");
while (true)
{
Socket clientSocket = listener.Accept(); //接收到客戶端的連接
var th = new Thread(new ParameterizedThreadStart(Receive));
th.Start(clientSocket);
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
/// <summary>
/// 線程調用
/// </summary>
private static void Receive(object o)//Socket clientSocket)
{
Socket clientSocket = (Socket)o;
clientSocket.Blocking = true;
IPEndPoint clientipe = (IPEndPoint)clientSocket.RemoteEndPoint;
// Console.WriteLine("[" + clientipe.Address.ToString() + "] Connected");
var key = string.Format("{0}-X-Q-X-{1}", clientipe.Address.ToString(), clientipe.Port);
if (!ht.ContainsKey(key))
{
//將ip地址設置爲hashTable的key值 若hashTable中存在該ip地址則不再ht中添加socket以免發送重複數據
ht.Add(key, clientSocket);
}
Console.WriteLine("接收到了客戶端：ip" + clientSocket.RemoteEndPoint.ToString() + "的連接");
byte[] buffer = new byte[1024];
int length = clientSocket.Receive(buffer);
clientSocket.Send(PackHandShakeData(GetSecKeyAccetp(buffer, length)));
Console.WriteLine("已經發送握手協議了....");
//接收用戶姓名信息
//length = clientSocket.Receive(buffer);
//string xm = AnalyticData(buffer, length);
//clientSocket.Send(PackData("連接時間：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")));
try
{
while (true)
{
var errLs = new List<object>();
//發送數據
string dtStr = string.Format("select * From esd");
DataTable db_device = SQLHelper.ExecuteDataTable(dtStr);
var device_list=CommonTransafer.ToList<Esd>(db_device);
//對比list
var exp = device_list.Where(a => (!esd_list.Exists(t => t.Esd_Status.Equals(a.Esd_Status) && t.Esd_ID.Equals(a.Esd_ID) && t.Esd_Num.Equals(a.Esd_Num) && t.Esd_Name.Equals(a.Esd_Name) && t.Esd_Area.Equals(a.Esd_Area) && t.Esd_Status.Equals(a.Esd_Status) && t.Esd_UpTime.Equals(a.Esd_UpTime) && t.Esd_CalArea.Equals(a.Esd_CalArea) && t.Esd_CrNate.Equals(a.Esd_CrNate)))).ToList();
//對比datatable
//IEnumerable<DataRow> query2 = db_device.AsEnumerable().Except(db_esd.AsEnumerable(), DataRowComparer.Default).ToList();
//var normalReceive = from r in db_esd.AsEnumerable()
// where
// !(from rr in db_device.AsEnumerable() select rr.Field<string>("Esd_UpTime")).Contains(
// r.Field<string>("Esd_UpTime"))
// select r;
//如果數據發生了變化，則發送
if (exp.Count() > 0)
{
var sendRet = (from a in exp
select new
{
device_area=a.Esd_Area,
device_alarm=a.Esd_Status,
device_time=a.Esd_UpTime
}).ToList();
string ret = JsonConvert.SerializeObject(sendRet);
Console.WriteLine("發送數據：“" + ret + "” 至客戶端....");
//遍歷hashTable中的數據獲取Socket發送數據
foreach (DictionaryEntry de in ht)
{
try
{
var sc = (Socket)de.Value;
sc.Send(PackData_new(ret));
esd_list = device_list.GetRange(0, device_list.Count);
//byte[] back = new byte[1024];
//try
//{
//int back_length = sc.Receive(back);
//string xm = AnalyticData(back, back_length);
//if (back_length==0)
//{
// errLs.Add(de.Key);
//}
//}
//catch (Exception)
//{
// errLs.Add(de.Key);
//}
}
catch (Exception e)
{
Console.WriteLine("Num:{0} err:{1}", ht.Count, e);
errLs.Add(de.Key);
}
}
}
if (errLs != null && errLs.Any())
{
foreach (var item in errLs)
{
ht.Remove(item);
}
}
Thread.Sleep(1000);
}
}
catch (SocketException e)
{
//去除字典
Console.WriteLine(e.Message);
}
catch (System.ObjectDisposedException e)
{
//去除字典
Console.WriteLine(e.Message);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
/// <summary>
/// 打包握手信息
/// </summary>
/// <param name="secKeyAccept">Sec-WebSocket-Accept</param>
/// <returns>數據包</returns>
private static byte[] PackHandShakeData(string secKeyAccept)
{
var responseBuilder = new StringBuilder();
responseBuilder.Append("HTTP/1.1 101 Switching Protocols" + Environment.NewLine);
responseBuilder.Append("Upgrade: websocket" + Environment.NewLine);
responseBuilder.Append("Connection: Upgrade" + Environment.NewLine);
responseBuilder.Append("Sec-WebSocket-Accept: " + secKeyAccept + Environment.NewLine + Environment.NewLine);
//如果把上一行換成下面兩行，纔是thewebsocketprotocol-17協議，但居然握手不成功，目前仍沒弄明白！
//responseBuilder.Append("Sec-WebSocket-Accept: " + secKeyAccept + Environment.NewLine);
//responseBuilder.Append("Sec-WebSocket-Protocol: chat" + Environment.NewLine);
return Encoding.UTF8.GetBytes(responseBuilder.ToString());
}
/// <summary>
/// 生成Sec-WebSocket-Accept
/// </summary>
/// <param name="handShakeText">客戶端握手信息</param>
/// <returns>Sec-WebSocket-Accept</returns>
private static string GetSecKeyAccetp(byte[] handShakeBytes, int bytesLength)
{
string handShakeText = Encoding.UTF8.GetString(handShakeBytes, 0, bytesLength);
string key = string.Empty;
Regex r = new Regex(@"Sec\-WebSocket\-Key:(.*?)\r\n");
Match m = r.Match(handShakeText);
if (m.Groups.Count != 0)
{
key = Regex.Replace(m.Value, @"Sec\-WebSocket\-Key:(.*?)\r\n", "$1").Trim();
}
byte[] encryptionString = SHA1.Create().ComputeHash(Encoding.ASCII.GetBytes(key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
return Convert.ToBase64String(encryptionString);
}
/// <summary>
/// 解析客戶端數據包
/// </summary>
/// <param name="recBytes">服務器接收的數據包</param>
/// <param name="recByteLength">有效數據長度</param>
/// <returns></returns>
private static string AnalyticData(byte[] recBytes, int recByteLength)
{
if (recByteLength < 2) { return string.Empty; }
bool fin = (recBytes[0] & 0x80) == 0x80; // 1bit，1表示最後一幀
if (!fin)
{
return string.Empty;// 超過一幀暫不處理
}
bool mask_flag = (recBytes[1] & 0x80) == 0x80; // 是否包含掩碼
if (!mask_flag)
{
return string.Empty;// 不包含掩碼的暫不處理
}
int payload_len = recBytes[1] & 0x7F; // 數據長度
byte[] masks = new byte[4];
byte[] payload_data;
if (payload_len == 126)
{
Array.Copy(recBytes, 4, masks, 0, 4);
payload_len = (UInt16)(recBytes[2] << 8 | recBytes[3]);
payload_data = new byte[payload_len];
Array.Copy(recBytes, 8, payload_data, 0, payload_len);
}
else if (payload_len == 127)
{
Array.Copy(recBytes, 10, masks, 0, 4);
byte[] uInt64Bytes = new byte[8];
for (int i = 0; i < 8; i++)
{
uInt64Bytes[i] = recBytes[9 - i];
}
UInt64 len = BitConverter.ToUInt64(uInt64Bytes, 0);
payload_data = new byte[len];
for (UInt64 i = 0; i < len; i++)
{
payload_data[i] = recBytes[i + 14];
}
}
else
{
Array.Copy(recBytes, 2, masks, 0, 4);
payload_data = new byte[payload_len];
Array.Copy(recBytes, 6, payload_data, 0, payload_len);
}
for (var i = 0; i < payload_len; i++)
{
payload_data[i] = (byte)(payload_data[i] ^ masks[i % 4]);
}
return Encoding.UTF8.GetString(payload_data);
}
/// <summary>
/// 打包服務器數據
/// </summary>
/// <param name="message">數據</param>
/// <returns>數據包</returns>
private static byte[] PackData(string message)
{
byte[] contentBytes = null;
byte[] temp = Encoding.UTF8.GetBytes(message);
if (temp.Length < 126)
{
contentBytes = new byte[temp.Length + 2];
contentBytes[0] = 0x81;
contentBytes[1] = (byte)temp.Length;
Array.Copy(temp, 0, contentBytes, 2, temp.Length);
}
else if (temp.Length < 0xFFFF)
{
contentBytes = new byte[temp.Length + 4];
contentBytes[0] = 0x81;
contentBytes[1] = 126;
contentBytes[2] = (byte)(temp.Length & 0xFF);
contentBytes[3] = (byte)(temp.Length >> 8 & 0xFF);
Array.Copy(temp, 0, contentBytes, 4, temp.Length);
}
else
{
// 暫不處理超長內容
}
return contentBytes;
}
/// <summary>
/// 打包服務器數據(處理超長數據)
/// </summary>
/// <param name="message">數據</param>
/// <returns>數據包</returns>
public static byte[] PackData_new(string message)
{
byte[] contentBytes = null;
byte[] temp = Encoding.UTF8.GetBytes(message);
if (temp.Length < 126)
{
contentBytes = new byte[temp.Length + 2];
contentBytes[0] = 0x81;
contentBytes[1] = (byte)temp.Length;
Array.Copy(temp, 0, contentBytes, 2, temp.Length);
}
else if (temp.Length < 0xFFFF)
{
contentBytes = new byte[temp.Length + 4];
contentBytes[0] = 0x81;
contentBytes[1] = 126;
contentBytes[2] = (byte)(temp.Length >> 8);
contentBytes[3] = (byte)(temp.Length & 0xFF);
Array.Copy(temp, 0, contentBytes, 4, temp.Length);
}
else
{
contentBytes = new byte[temp.Length + 10];
contentBytes[0] = 0x81;
contentBytes[1] = 127;
contentBytes[2] = 0;
contentBytes[3] = 0;
contentBytes[4] = 0;
contentBytes[5] = 0;
contentBytes[6] = (byte)(temp.Length >> 24);
contentBytes[7] = (byte)(temp.Length >> 16);
contentBytes[8] = (byte)(temp.Length >> 8);
contentBytes[9] = (byte)(temp.Length & 0xFF);
Array.Copy(temp, 0, contentBytes, 10, temp.Length);
}
return contentBytes;
}
}
}
前端代碼：
//連接websocket
function connect() {
ws = new WebSocket("ws://192.168.10.103:9002");
ws.onopen = function (e) {
ws.send('{ws://192.168.10.103:9002}');
};
ws.onmessage = function (e) {
var data_list = JSON.parse(e.data);
//處理消息，在頁面展示內容（自由擴展）
//ws.send('{1}');發送消息給後臺
};
ws.onerror = function (e) {
alert("網絡連接錯誤！");
};
ws.onclose = function (e) {
alert("服務器斷開！");
};
};