实时聊天室：基于Laravel+Pusher+Vue通过事件广播实现

composer create-project laravel/laravel chatroom --prefer-dist

composer require pusher/pusher-php-server

npm install

npm install --save laravel-echo pusher-js

import Echo from 'laravel-echo'
window.Pusher = require('pusher-js');
window.Echo = new Echo({
    broadcaster: 'pusher',
    key: process.env.MIX_PUSHER_APP_KEY,
    cluster: process.env.MIX_PUSHER_APP_CLUSTER,
    encrypted: true
});

php artisan make:auth

php artisan make:model Message -m

/**
 * Fields that are mass assignable
 *
 * @var array
 */
protected $fillable = ['message'];

Schema::create('messages', function (Blueprint $table) {
    $table->increments('id');
    $table->integer('user_id')->unsigned();
    $table->text('message');
    $table->timestamps();
});

/**
 * A user can have many messages
 *
 * @return \Illuminate\Database\Eloquent\Relations\HasMany
 */
public function messages()
{
    return $this->hasMany(Message::class);
}

/**
 * A message belong to a user
 *
 * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
 */
public function user()
{
    return $this->belongsTo(User::class);
}

php artisan make:controller ChatsController

<?php
namespace App\Http\Controllers;
use Auth;
use App\Message;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
class ChatsController extends Controller
{
    public function __construct()
    {
        $this->middleware(&#39;auth&#39;);  // 登录用户才能访问
    }
    /**
     * Show chats
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        return view(&#39;chat&#39;);
    }
    /**
     * Fetch all messages
     *
     * @return Message
     */
    public function fetchMessages()
    {
        return Message::with(&#39;user&#39;)->get();
    }
    /**
     * Persist message to database
     *
     * @param  Request $request
     * @return Response
     */
    public function sendMessage(Request $request)
    {
        $user = Auth::user();
        $message = $user->messages()->create([
            &#39;message&#39; => $request->input(&#39;message&#39;)
        ]);
        return [&#39;status&#39; => &#39;Message Sent!&#39;];
    }
}

Route::get('/', 'ChatsController@index');
Route::get('messages', 'ChatsController@fetchMessages');
Route::post('messages', 'ChatsController@sendMessage');

protected $redirectTo = '/';

@extends('layouts.app')
@section('content')
    <div class="container">
        <div class="row">
            <div class="col-md-8 col-md-offset-2">
                <div class="panel panel-default">
                    <div class="panel-heading">聊天室</div>
                    <div class="panel-body">
                        <chat-messages :messages="messages"></chat-messages>
                    </div>
                    <div class="panel-footer">
                        <chat-form
                                v-on:messagesent="addMessage"
                                :user="{{ Auth::user() }}"
                        ></chat-form>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection

<style>
  .chat {
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chat li {
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 1px dotted #B3A9A9;
  }
  .chat li .chat-body p {
    margin: 0;
    color: #777777;
  }
  .panel-body {
    overflow-y: scroll;
    height: 350px;
  }
  ::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
    background-color: #F5F5F5;
  }
  ::-webkit-scrollbar {
    width: 12px;
    background-color: #F5F5F5;
  }
  ::-webkit-scrollbar-thumb {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
    background-color: #555;
  }
</style>

<template>
    <ul class="chat">
        <li class="left clearfix" v-for="message in messages">
            <div class="chat-body clearfix">
                <div class="header">
                    <strong class="primary-font">
                        {{ message.user.name }}
                    </strong>
                </div>
                <p>
                    {{ message.message }}
                </p>
            </div>
        </li>
    </ul>
</template>
<script>
    export default {
        props: [&#39;messages&#39;]
    };
</script>

<template>
    <div class="input-group">
        <input id="btn-input" type="text" name="message" class="form-control input-sm" placeholder="在这里输入要发送的消息..." v-model="newMessage" @keyup.enter="sendMessage">
        <span class="input-group-btn">
            <button class="btn btn-primary btn-sm" id="btn-chat" @click="sendMessage">
                发送
            </button>
        </span>
    </div>
</template>
<script>
    export default {
        props: [&#39;user&#39;],
        data() {
            return {
                newMessage: &#39;&#39;
            }
        },
        methods: {
            sendMessage() {
                this.$emit(&#39;messagesent&#39;, {
                    user: this.user,
                    message: this.newMessage
                });
                this.newMessage = &#39;&#39;
            }
        }    
    }
</script>

require('./bootstrap');
window.Vue = require('vue');
Vue.component('chat-messages', require('./components/ChatMessages.vue'));
Vue.component('chat-form', require('./components/ChatForm.vue'));
const app = new Vue({
    el: '#app',
    data: {
        messages: []
    },
    created() {
        this.fetchMessages();
    },
    methods: {
        fetchMessages() {
            axios.get('/messages').then(response => {
                this.messages = response.data;
            });
        },
        addMessage(message) {
            this.messages.push(message);
            axios.post('/messages', message).then(response => {
                console.log(response.data);
            });
        }
    }
});

php artisan make:event MessageSent

<?php
namespace App\Events;
use App\Message;
use App\User;
use Illuminate\Broadcasting\Channel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Broadcasting\PresenceChannel;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
class MessageSent implements ShouldBroadcast
{
    use Dispatchable, InteractsWithSockets, SerializesModels;
    /**
     * User that sent the message
     *
     * @var User
     */
    public $user;
    /**
     * Message details
     *
     * @var Message
     */
    public $message;
    /**
     * Create a new event instance.
     * @param User $user
     * @param Message $message
     * @return void
     */
    public function __construct(User $user, Message $message)
    {
        $this->user = $user;
        $this->message = $message;
    }
    /**
     * Get the channels the event should broadcast on.
     *
     * @return \Illuminate\Broadcasting\Channel|array
     */
    public function broadcastOn()
    {
        return new PrivateChannel(&#39;chat&#39;);
    }
}

public function sendMessage(Request $request)
{
    $user = Auth::user();
    $message = $user->messages()->create([
        'message' => $request->input('message')
    ]);
    broadcast(new MessageSent($user, $message))->toOthers();
    return ['status' => 'Message Sent!'];
}

Broadcast::channel('chat', function ($user) {
    return Auth::check();
});

created() {
    this.fetchMessages();
    Echo.private('chat')
        .listen('MessageSent', (e) => {
            this.messages.push({
                message: e.message.message,
                user: e.user
            });
        });
},

npm run dev

php artisan serve