Question

我正在使用Socket.io来创建一个简单的应用程序。要测试客户端和服务器端是否正常工作，我使用public static int[] getAsArray(String value){ // not null ; not empty ; contains only 0 and 1 if(value == null || value.trim().length()<1 || !value.matches("[0-1]+")){ return new int[0]; } //if it necessary !value.matches("[0-1]+" regex to validate value = value.trim(); value = value.length()>64 ? value.substring(0,63) : value;// up to 64 characters int[] valueAsInt = new int[value.trim().length()]; for (int i = 0 ;i<value.length();i++){ valueAsInt[i]=(int)value.toCharArray()[i]-48; } return valueAsInt; }向服务器发送消息，并socket.emit在服务器控制台上写入消息。

现在，我已经能够通过在连接客户端时在控制台上写一些东西来将客户端连接到服务器端。但我的问题是当我尝试向服务器发送（socket.on）数据时，不会触发socket.emit方法。它也没有给出任何错误。

以下是我的代码片段

客户端--index.html

socket.on

socket.io.js

    <!DOCTYPE html>
    <html>
      <head>

          <title>Socket.IO chat</title>
    <style>
      * { margin: 0; padding: 0; box-sizing: border-box; }
      body { font: 13px Helvetica, Arial; }
      form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
      form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
      form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages li { padding: 5px 10px; }
      #messages li:nth-child(odd) { background: #eee; }
    </style>

        <script socket.io.js"></script>
        <script src="socket.js"></script>
        <script src="https://code.jquery.com/jquery-1.11.1.js"></script>

<script>


  $(function () {
      var socket = io();
      $('form').submit(function(){
        socket.emit('message', $('#m').val());
        $('#m').val('');
        return false;
      });
    });
  </script>

      </head>
    <body>
    <ul id="messages"></ul>
    <form action="">
      <input id="m" autocomplete="off" /><button>Send</button>
    </form>
  </body>

    </html>

Socket.js

!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.io=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){

module.exports = _dereq_('./lib/');

},{"./lib/":2}],2:[function(_dereq_,module,exports){

/**
 * Module dependencies.
 */

var url = _dereq_('./url');
var parser = _dereq_('socket.io-parser');
var Manager = _dereq_('./manager');
var debug = _dereq_('debug')('socket.io-client');

/**
 * Module exports.
 */

module.exports = exports = lookup;

/**
 * Managers cache.
 */

var cache = exports.managers = {};

/**
 * Looks up an existing `Manager` for multiplexing.
 * If the user summons:
 *
 *   `io('http://localhost/a');`
 *   `io('http://localhost/b');`
 *
 * We reuse the existing instance based on same scheme/port/host,
 * and we initialize sockets for each namespace.
 *
 * @api public
 */

function lookup(uri, opts) {
  if (typeof uri == 'object') {
    opts = uri;
    uri = undefined;
  }

  opts = opts || {};

  var parsed = url(uri);
  var source = parsed.source;
  var id = parsed.id;
  var path = parsed.path;
  var sameNamespace = (cache[id] && cache[id].nsps[path] &&
                      path == cache[id].nsps[path].nsp);
  var newConnection = opts.forceNew || opts['force new connection'] ||
                      false === opts.multiplex || sameNamespace;

  var io;

  if (newConnection) {
    debug('ignoring socket cache for %s', source);
    io = Manager(source, opts);
  } else {
    if (!cache[id]) {
      debug('new io instance for %s', source);
      cache[id] = Manager(source, opts);
    }
    io = cache[id];
  }

  return io.socket(parsed.path);
}

/**
 * Protocol version.
 *
 * @api public
 */

exports.protocol = parser.protocol;

/**
 * `connect`.
 *
 * @param {String} uri
 * @api public
 */

exports.connect = lookup;

/**
 * Expose constructors for standalone build.
 *
 * @api public
 */

exports.Manager = _dereq_('./manager');
exports.Socket = _dereq_('./socket');

},{"./manager":3,"./socket":5,"./url":6,"debug":10,"socket.io-parser":44}],3:[function(_dereq_,module,exports){

/**
 * Module dependencies.
 */

var url = _dereq_('./url');
var eio = _dereq_('engine.io-client');
var Socket = _dereq_('./socket');
var Emitter = _dereq_('component-emitter');
var parser = _dereq_('socket.io-parser');
var on = _dereq_('./on');
var bind = _dereq_('component-bind');
var object = _dereq_('object-component');
var debug = _dereq_('debug')('socket.io-client:manager');
var indexOf = _dereq_('indexof');
var Backoff = _dereq_('backo2');

/**
 * Module exports
 */

module.exports = Manager;

/**
 * `Manager` constructor.
 *
 * @param {String} engine instance or engine uri/opts
 * @param {Object} options
 * @api public
 */

function Manager(uri, opts){
  if (!(this instanceof Manager)) return new Manager(uri, opts);
  if (uri && ('object' == typeof uri)) {
    opts = uri;
    uri = undefined;
  }
  opts = opts || {};

  opts.path = opts.path || '/socket.io';
  this.nsps = {};
  this.subs = [];
  this.opts = opts;
  this.reconnection(opts.reconnection !== false);
  this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);
  this.reconnectionDelay(opts.reconnectionDelay || 1000);
  this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);
  this.randomizationFactor(opts.randomizationFactor || 0.5);
  this.backoff = new Backoff({
    min: this.reconnectionDelay(),
    max: this.reconnectionDelayMax(),
    jitter: this.randomizationFactor()
  });
  this.timeout(null == opts.timeout ? 20000 : opts.timeout);
  this.readyState = 'closed';
  this.uri = uri;
  this.connected = [];
  this.encoding = false;
  this.packetBuffer = [];
  this.encoder = new parser.Encoder();
  this.decoder = new parser.Decoder();
  this.autoConnect = opts.autoConnect !== false;
  if (this.autoConnect) this.open();
}

/**
 * Propagate given event to sockets and emit on `this`
 *
 * @api private
 */

Manager.prototype.emitAll = function() {
  this.emit.apply(this, arguments);
  for (var nsp in this.nsps) {
    this.nsps[nsp].emit.apply(this.nsps[nsp], arguments);
  }
};

/**
 * Update `socket.id` of all sockets
 *
 * @api private
 */

Manager.prototype.updateSocketIds = function(){
  for (var nsp in this.nsps) {
    this.nsps[nsp].id = this.engine.id;
  }
};

/**
 * Mix in `Emitter`.
 */

Emitter(Manager.prototype);

/**
 * Sets the `reconnection` config.
 *
 * @param {Boolean} true/false if it should automatically reconnect
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnection = function(v){
  if (!arguments.length) return this._reconnection;
  this._reconnection = !!v;
  return this;
};

/**
 * Sets the reconnection attempts config.
 *
 * @param {Number} max reconnection attempts before giving up
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnectionAttempts = function(v){
  if (!arguments.length) return this._reconnectionAttempts;
  this._reconnectionAttempts = v;
  return this;
};

/**
 * Sets the delay between reconnections.
 *
 * @param {Number} delay
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnectionDelay = function(v){
  if (!arguments.length) return this._reconnectionDelay;
  this._reconnectionDelay = v;
  this.backoff && this.backoff.setMin(v);
  return this;
};

Manager.prototype.randomizationFactor = function(v){
  if (!arguments.length) return this._randomizationFactor;
  this._randomizationFactor = v;
  this.backoff && this.backoff.setJitter(v);
  return this;
};

/**
 * Sets the maximum delay between reconnections.
 *
 * @param {Number} delay
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnectionDelayMax = function(v){
  if (!arguments.length) return this._reconnectionDelayMax;
  this._reconnectionDelayMax = v;
  this.backoff && this.backoff.setMax(v);
  return this;
};

/**
 * Sets the connection timeout. `false` to disable
 *
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.timeout = function(v){
  if (!arguments.length) return this._timeout;
  this._timeout = v;
  return this;
};

/**
 * Starts trying to reconnect if reconnection is enabled and we have not
 * started reconnecting yet
 *
 * @api private
 */

Manager.prototype.maybeReconnectOnOpen = function() {
  // Only try to reconnect if it's the first time we're connecting
  if (!this.reconnecting && this._reconnection && this.backoff.attempts === 0) {
    // keeps reconnection from firing twice for the same reconnection loop
    this.reconnect();
  }
};


/**
 * Sets the current transport `socket`.
 *
 * @param {Function} optional, callback
 * @return {Manager} self
 * @api public
 */

Manager.prototype.open =
Manager.prototype.connect = function(fn){
  debug('readyState %s', this.readyState);
  if (~this.readyState.indexOf('open')) return this;

  debug('opening %s', this.uri);
  this.engine = eio(this.uri, this.opts);
  var socket = this.engine;
  var self = this;
  this.readyState = 'opening';
  this.skipReconnect = false;

  // emit `open`
  var openSub = on(socket, 'open', function() {
    self.onopen();
    fn && fn();
  });

  // emit `connect_error`
  var errorSub = on(socket, 'error', function(data){
    debug('connect_error');
    self.cleanup();
    self.readyState = 'closed';
    self.emitAll('connect_error', data);
    if (fn) {
      var err = new Error('Connection error');
      err.data = data;
      fn(err);
    } else {
      // Only do this if there is no fn to handle the error
      self.maybeReconnectOnOpen();
    }
  });

  // emit `connect_timeout`
  if (false !== this._timeout) {
    var timeout = this._timeout;
    debug('connect attempt will timeout after %d', timeout);

    // set timer
    var timer = setTimeout(function(){
      debug('connect attempt timed out after %d', timeout);
      openSub.destroy();
      socket.close();
      socket.emit('error', 'timeout');
      self.emitAll('connect_timeout', timeout);
    }, timeout);

    this.subs.push({
      destroy: function(){
        clearTimeout(timer);
      }
    });
  }

  this.subs.push(openSub);
  this.subs.push(errorSub);

  return this;
};

/**
 * Called upon transport open.
 *
 * @api private
 */

Manager.prototype.onopen = function(){
  debug('open');

  // clear old subs
  this.cleanup();

  // mark as open
  this.readyState = 'open';
  this.emit('open');

  // add new subs
  var socket = this.engine;
  this.subs.push(on(socket, 'data', bind(this, 'ondata')));
  this.subs.push(on(this.decoder, 'decoded', bind(this, 'ondecoded')));
  this.subs.push(on(socket, 'error', bind(this, 'onerror')));
  this.subs.push(on(socket, 'close', bind(this, 'onclose')));
};

/**
 * Called with data.
 *
 * @api private
 */

Manager.prototype.ondata = function(data){
  this.decoder.add(data);
};

/**
 * Called when parser fully decodes a packet.
 *
 * @api private
 */

Manager.prototype.ondecoded = function(packet) {
  this.emit('packet', packet);
};

/**
 * Called upon socket error.
 *
 * @api private
 */

Manager.prototype.onerror = function(err){
  debug('error', err);
  this.emitAll('error', err);
};

/**
 * Creates a new socket for the given `nsp`.
 *
 * @return {Socket}
 * @api public
 */

Manager.prototype.socket = function(nsp){
  var socket = this.nsps[nsp];
  if (!socket) {
    socket = new Socket(this, nsp);
    this.nsps[nsp] = socket;
    var self = this;
    socket.on('connect', function(){
      socket.id = self.engine.id;
      if (!~indexOf(self.connected, socket)) {
        self.connected.push(socket);
      }
    });
  }
  return socket;
};

/**
 * Called upon a socket close.
 *
 * @param {Socket} socket
 */

Manager.prototype.destroy = function(socket){
  var index = indexOf(this.connected, socket);
  if (~index) this.connected.splice(index, 1);
  if (this.connected.length) return;

  this.close();
};

/**
 * Writes a packet.
 *
 * @param {Object} packet
 * @api private
 */

Manager.prototype.packet = function(packet){
  debug('writing packet %j', packet);
  var self = this;

  if (!self.encoding) {
    // encode, then write to engine with result
    self.encoding = true;
    this.encoder.encode(packet, function(encodedPackets) {
      for (var i = 0; i < encodedPackets.length; i++) {
        self.engine.write(encodedPackets[i]);
      }
      self.encoding = false;
      self.processPacketQueue();
    });
  } else { // add packet to the queue
    self.packetBuffer.push(packet);
  }
};
.....

服务器端

    app.factory('socket', function(socketFactory){

        var socket = io.connect('http://0.0.0.0:3001');

        mySocket = socketFactory({
            ioSocket: socket
        });
        return socket;
    });

我似乎无法确定究竟是什么问题，也许我做的不对。

额外信息

    var express = require('express'),
        app = express(),
        cors = require('cors'),
        server = require('http').createServer(app),
        io = require('socket.io').listen(server),
        mongoose = require('mongoose'),
        users = {};
        var path = require('path');
    var gcm = require('node-gcm');
    var  fs = require('fs');
    var url = require('url');

      app.use(function (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', "http://"+req.headers.host+':3001');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
    next();
    }
    );




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

      console.log('New User Connected to this server'); // This prints the content as soon as a client connects to the server.        

    socket.on('message', function(msg){
      console.log('message: ' + msg);  //This doesn't work and as well doesn't print any error message on the server console
    });
});

Answer 1

此答案已更新，请参阅编辑部分。

您可以使用简单的套接字工厂，而不是使用socketFactory：

app.factory('socket', function ($rootScope) {
  var socket = io.connect();
  return {
    on: function (eventName, callback) {
      socket.on(eventName, function () {
        var args = arguments;
        $rootScope.$apply(function () {
          callback.apply(socket, args);
        });
      });
    },
    emit: function (eventName, data, callback) {
      socket.emit(eventName, data, function () {
        var args = arguments;
        $rootScope.$apply(function () {
          if (callback) {
            callback.apply(socket, args);
          }
        });
      })
    }
  };
});

然后像你一样使用它。

编辑：

在你的例子中，我不了解多项内容：

你在html代码中包含socket-io库在哪里？

您在socket.js文件中使用Angular JS synthax但不使用Angular JS和angular-js-io模块。

以您的例子为例，我有两个错误：

首先删除socket.js脚本，它不会起作用。根据您的喜好，包括带cdn的socket-io-client库或下载它或从您的节点js服务器提供它。它应该工作。

Answer 2

我建议我们从这个简单的设置开始，只有当它起作用时才会使它复杂化;）

server.js

var express = require('express'),
    app = express(),
    server = require('http').createServer(app),
    io = require('socket.io').listen(server),
    users = {};

app.use(express.static(__dirname));
app.get('/', function (req, res) {
    res.sendFile(__dirname + '/george.html');
});

io.sockets.on('connection', function(socket){
    console.log('New User Connected to this server'); // This prints the content as soon as a client connects to the server.
    socket.on('message', function(msg){
        console.log('message: ' + msg);  //This doesn't work and as well doesn't print any error message on the server console
    });
});

server.listen(3001, function(){
  console.log('listening on port 3001');
});

george.html

<!DOCTYPE html>
<html>
    <head>
        <title>Socket.IO chat</title>
       <script src="https://code.jquery.com/jquery-1.11.1.js"></script>
       <script src="/socket.io/socket.io.js"></script>
       <script>
           $(function () {
               var socket = io();
               $('form').submit(function(e){
                   socket.emit('message', $('#m').val());
                   $('#m').val('');
                   return false;
               });
           });
       </script>
    </head>
    <body>
        <ul id="messages"></ul>
        <form action="">
            <input id="m" autocomplete="off" /><button>Send</button>
        </form>

    </body>
</html>

您没有使用server.listen，
您未在客户端加载socket.io.js
你根本不需要socket.js

Socket.emit无法触发socket.on

2 个答案: