express+mongodb+socket.io

node后端代码

// Setup basic express server
var express = require('express');
var app = express();
var path = require('path');
var server = require('http').createServer(app);
var io = require('socket.io')(server);
var port = process.env.PORT || 9000;
var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://172.16.81.36:27017/runoob';


server.listen(port, function () {
  console.log('Server listening at port %d', port);
});

// Routing
app.use(express.static(path.join(__dirname, 'public')));

// Chatroom

var numUsers = 0;

app.get('/setUsername', function (req, res) {

    if(req.query.username!=undefined&&req.query.username!=''&&req.query.password!=undefined&&req.query.password!=''){

        var selectData = function(db, callback) {
          //连接到表
          var collection = db.collection('site');
          //查询数据
          var whereStr = {"username":req.query.username,"password":req.query.password};
          collection.find(whereStr).toArray(function(err, result) {
            if(err)
            {
              console.log('Error:'+ err);
              return;
            }
            callback(result);
          });
        }


        var insertData = function(db, callback) {
            //连接到表 site
            var collection = db.collection('site');
            //插入数据
            var data = [{"username":req.query.username,"password":req.query.password}];
            collection.insert(data, function(err, result) {
                if(err)
                {
                    console.log('Error:'+ err);
                    return;
                }
                callback(result);
            });
        }

        MongoClient.connect(DB_CONN_STR, function(err, db) {
            console.log("连接成功！");
            selectData(db, function(result) {
            //    console.log(result.length);
               if(result==''){
                   console.log("请输入真实姓名");
                   res.send({
                         errorCode:-1,
                         errorMsg:'请输入正确的姓名和密码'
                    });
                   /*
                   注册
                   */
                //    insertData(db, function(result) {
                    //    console.log(result);
                    //    res.send({
                    //        errorCode:-1,
                    //        errorMsg:'请输入真实姓名'
                    //    });
                //        db.close();
                //    });
               }else{
                   console.log("登录成功");
                   res.send({
                       errorCode:0,
                       errorMsg:'登录成功'
                   });
               }
               db.close();
             });
        });

    }else{
        res.send({
            errorCode:-1,
            errorMsg:'姓名和密码不能为空'
        });
    }
})


io.on('connection', function (socket) {

  var addedUser = false;

  // when the client emits 'new message', this listens and executes
  socket.on('new message', function (data) {
    // we tell the client to execute 'new message'
    socket.broadcast.emit('new message', {
      username: socket.username,
      message: data
    });
  });

  // when the client emits 'add user', this listens and executes
  socket.on('add user', function (username) {
    if (addedUser) return;

    // we store the username in the socket session for this client
    socket.username = username;
    ++numUsers;
    addedUser = true;
    socket.emit('login', {
      numUsers: numUsers
    });
    // echo globally (all clients) that a person has connected
    socket.broadcast.emit('user joined', {
      username: socket.username,
      numUsers: numUsers
    });
  });

  // when the client emits 'typing', we broadcast it to others
  socket.on('typing', function () {
    socket.broadcast.emit('typing', {
      username: socket.username
    });
  });

  // when the client emits 'stop typing', we broadcast it to others
  socket.on('stop typing', function () {
    socket.broadcast.emit('stop typing', {
      username: socket.username
    });
  });

  // when the user disconnects.. perform this
  socket.on('disconnect', function () {
    if (addedUser) {
      --numUsers;

      // echo globally that this client has left
      socket.broadcast.emit('user left', {
        username: socket.username,
        numUsers: numUsers
      });
    }
  });
});

前端代码

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>即时通讯</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <ul class="pages">

    <li class="chat page">
      <div class="chatArea">
        <ul class="messages">
            <!-- 信息 -->
        </ul>
      </div>
      <!-- 输入框 -->
      <input class="inputMessage" placeholder="Type here..."/>
    </li>

    <!-- 登录页面 -->
    <li class="login page">
      <div class="form">
        <h3 class="title">请设置你的名字</h3>
        <input class="usernameInput" type="text" maxlength="14" />
        <h3 class="title">请设置你的密码</h3>
        <input class="passwordInput" type="password" maxlength="14" />
        <br>
        <br>
        <br>
        <input type="button" name="" value="登录" class="loginBtn" style='height:60px;160px;font-size:30px;'>
      </div>
    </li>

  </ul>
  <script src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
  <script src="/socket.io.js"></script>
  <script src="/main.js"></script>
</body>
</html>

　　main.js文件

$(function() {
  var FADE_TIME = 150; // ms
  var TYPING_TIMER_LENGTH = 400; // ms
  var COLORS = [
    '#e21400', '#91580f', '#f8a700', '#f78b00',
    '#58dc00', '#287b00', '#a8f07a', '#4ae8c4',
    '#3b88eb', '#3824aa', '#a700ff', '#d300e7'
  ];

  // Initialize variables
  var $window = $(window);
  var $usernameInput = $('.usernameInput'); // Input for username
  var $messages = $('.messages'); // Messages area
  var $inputMessage = $('.inputMessage'); // Input message input box

  var $loginPage = $('.login.page'); // The login page
  var $chatPage = $('.chat.page'); // The chatroom page

  // Prompt for setting a username
  var username;
  var connected = false;
  var typing = false;
  var lastTypingTime;
  // var $currentInput = $usernameInput.focus();
  $('.loginBtn').click(function(){
      setUsername ();
  })
  var socket = io();

  function addParticipantsMessage (data) {
    var message = '';
    if (data.numUsers === 1) {
      message += "有 1 个人加入了聊天室";
    } else {
      message += "有 " + data.numUsers + " 个人加入了聊天室";
    }
    log(message);
  }



  // Sets the client's username
  function setUsername () {
    username = cleanInput($usernameInput.val().trim());
    var password=$('.passwordInput').val();
    var url='http://172.16.81.36:9000/setUsername';
    console.log(username);
    $.ajax({
        url:url,
        type:'get',
        data:{
            username:username,
            password:password
        },
        success:function(res){
            console.log(res);
            if (res.errorCode==0) {
                $loginPage.fadeOut();
                $chatPage.show();
                $loginPage.off('click');
                // $currentInput = $inputMessage.focus();

                // Tell the server your username
                socket.emit('add user', username);
            }else{
                alert(res.errorMsg)
                username=false;
            }
        }
    })
    // If the username is valid

  }

  // Sends a chat message
  function sendMessage () {
    var message = $inputMessage.val();
    // Prevent markup from being injected into the message
    message = cleanInput(message);
    // if there is a non-empty message and a socket connection
    if (message && connected) {
      $inputMessage.val('');
      addChatMessage({
        username: username,
        message: message
      });
      // tell server to execute 'new message' and send along one parameter
      socket.emit('new message', message);
    }
  }

  // Log a message
  function log (message, options) {
    var $el = $('<li>').addClass('log').text(message);
    addMessageElement($el, options);
  }

  // Adds the visual chat message to the message list
  function addChatMessage (data, options) {
    // Don't fade the message in if there is an 'X was typing'
    var $typingMessages = getTypingMessages(data);
    options = options || {};
    if ($typingMessages.length !== 0) {
      options.fade = false;
      $typingMessages.remove();
    }

    var $usernameDiv = $('<span class="username"/>')
      .text(data.username)
      .css('color', getUsernameColor(data.username));
    var $messageBodyDiv = $('<span class="messageBody">')
      .text(data.message);

    var typingClass = data.typing ? 'typing' : '';
    var $messageDiv = $('<li class="message"/>')
      .data('username', data.username)
      .addClass(typingClass)
      .append($usernameDiv, $messageBodyDiv);

    addMessageElement($messageDiv, options);
  }

  // Adds the visual chat typing message
  function addChatTyping (data) {
    data.typing = true;
    data.message = '用户正在输入';
    addChatMessage(data);
  }

  // Removes the visual chat typing message
  function removeChatTyping (data) {
    getTypingMessages(data).fadeOut(function () {
      $(this).remove();
    });
  }

  // Adds a message element to the messages and scrolls to the bottom
  // el - The element to add as a message
  // options.fade - If the element should fade-in (default = true)
  // options.prepend - If the element should prepend
  //   all other messages (default = false)
  function addMessageElement (el, options) {
    var $el = $(el);

    // Setup default options
    if (!options) {
      options = {};
    }
    if (typeof options.fade === 'undefined') {
      options.fade = true;
    }
    if (typeof options.prepend === 'undefined') {
      options.prepend = false;
    }

    // Apply options
    if (options.fade) {
      $el.hide().fadeIn(FADE_TIME);
    }
    if (options.prepend) {
      $messages.prepend($el);
    } else {
      $messages.append($el);
    }
    $messages[0].scrollTop = $messages[0].scrollHeight;
  }

  // Prevents input from having injected markup
  function cleanInput (input) {
    return $('<div/>').text(input).html();
  }

  // Updates the typing event
  function updateTyping () {
    if (connected) {
      if (!typing) {
        typing = true;
        socket.emit('typing');
      }
      lastTypingTime = (new Date()).getTime();

      setTimeout(function () {
        var typingTimer = (new Date()).getTime();
        var timeDiff = typingTimer - lastTypingTime;
        if (timeDiff >= TYPING_TIMER_LENGTH && typing) {
          socket.emit('stop typing');
          typing = false;
        }
      }, TYPING_TIMER_LENGTH);
    }
  }

  // Gets the 'X is typing' messages of a user
  function getTypingMessages (data) {
    return $('.typing.message').filter(function (i) {
      return $(this).data('username') === data.username;
    });
  }

  // Gets the color of a username through our hash function
  function getUsernameColor (username) {
    // Compute hash code
    var hash = 7;
    for (var i = 0; i < username.length; i++) {
       hash = username.charCodeAt(i) + (hash << 5) - hash;
    }
    // Calculate color
    var index = Math.abs(hash % COLORS.length);
    return COLORS[index];
  }

  // Keyboard events

  $window.keydown(function (event) {
    // Auto-focus the current input when a key is typed
    if (!(event.ctrlKey || event.metaKey || event.altKey)) {
    //   $currentInput.focus();
    }
    // When the client hits ENTER on their keyboard
    if (event.which === 13) {
        // console.log(username);
      if (username) {
        sendMessage();
        socket.emit('stop typing');
        typing = false;
      } else {

        setUsername();
      }
    }
  });

  $inputMessage.on('input', function() {
    updateTyping();
  });

  // Click events

  // Focus input when clicking anywhere on login page
  $loginPage.click(function () {
    // $currentInput.focus();
  });

  // Focus input when clicking on the message input's border
  $inputMessage.click(function () {
    $inputMessage.focus();
  });

  // Socket events

  // Whenever the server emits 'login', log the login message
  socket.on('login', function (data) {
    connected = true;
    // Display the welcome message
    var message = "欢迎你来到前端侃大山~";
    log(message, {
      prepend: true
    });
    addParticipantsMessage(data);
  });

  // Whenever the server emits 'new message', update the chat body

  socket.on('new message', function (data) {
    addChatMessage(data);
  });

  // Whenever the server emits 'user joined', log it in the chat body
  socket.on('user joined', function (data) {
    log(data.username + ' 加入了聊天室');
    addParticipantsMessage(data);
  });

  // Whenever the server emits 'user left', log it in the chat body
  socket.on('user left', function (data) {
    log(data.username + ' 离开了聊天室');
    addParticipantsMessage(data);
    removeChatTyping(data);
  });

  // Whenever the server emits 'typing', show the typing message
  socket.on('typing', function (data) {
    addChatTyping(data);
  });

  // Whenever the server emits 'stop typing', kill the typing message
  socket.on('stop typing', function (data) {
    removeChatTyping(data);
  });

  socket.on('disconnect', function () {
    log('小主，掉线了~');
  });

  socket.on('reconnect', function () {
    log('you have been reconnected');
    if (username) {
      socket.emit('add user', username);
    }
  });

  socket.on('reconnect_error', function () {
    log('链接服务器失败~');
  });

});