WebSocket 协议是基于 TCP 的一种新的网络协议。它实现了浏览器与服务器全双工(full-duplex)通信，允许服务器主动发送信息给客户端。
下面的代码演示了利用 Swoole 实现服务器向浏览器主动推送数据的例子。
Server端代码：
代码语言：javascript复制<?php
$server = new SwooleWebsocketServer('192.168.1.1', 9501);
$server->on('Open', function($server, $req) {
echo 'connection open: '.$req->fd . "n";
$server->push($req->fd, "welcome to www.sunbloger.com");
for ($i=1; $i<=9; $i ) {
$server->push($req->fd, $i);
sleep(3);
}
});
$server->on('Message', function($server, $req) {
echo "client(".$req->fd."): " . $req->data . "n";
});
$server->on('Close', function($server, $fd) {
echo "connection close: {$fd}n";
});
$server->on('WorkerStart', function ($server, $workerId) {
echo "worker started: {$workerId}n";
});
$server->start();
?>浏览器端（Client）代码：
代码语言：javascript复制<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WebSocket Client</title>
</head>
<body>
<input type="text" id="text">
<input type="submit" value="发送数据" onclick="send()">
<div id="msg"></div>
</body>
<script>
var isSupport;
if (typeof WebSocket != 'undefined') {
isSupport = true;
} else {
isSupport = false;
}
if (isSupport == true) {
var msg = document.getElementById("msg");
var wsServer = 'ws://192.168.1.1:9501';
var websocket = new WebSocket(wsServer);
websocket.onopen = function (e) {
console.log("websocket server open.");
};
websocket.onmessage = function (e) {
msg.innerHTML = e.data '<br>';
}
websocket.onclose = function (e) {
console.log("websocket server close.");
};
}
function send() {
if (isSupport == true) {
var text = document.getElementById('text').value;
document.getElementById('text').value = ''; //向服务器发送数据
websocket.send(text);
} else {
alert("浏览器不支持WebSocket！");
}
}
</script>
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