Server
public class Server {
public static final int INET_PORT = 8888;
public static void main(String[] args) throws Exception {
EventLoopGroup boss = new NioEventLoopGroup();
EventLoopGroup worker = new NioEventLoopGroup();
ServerBootstrap serverBootstrap = new ServerBootstrap();
try {
serverBootstrap.group(boss, worker)
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new WebSocketChannelInitializer());
ChannelFuture channelFuture = serverBootstrap.bind(INET_PORT).sync();
channelFuture.channel().closeFuture().sync();
}finally {
boss.shutdownGracefully();
worker.shutdownGracefully();
}
}
}
public class WebSocketChannelInitializer extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast(new HttpServerCodec());
pipeline.addLast(new ChunkedWriteHandler());
pipeline.addLast(new HttpObjectAggregator(8192));
pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));
pipeline.addLast(new WebSocketChannelHandler());
}
}
public class WebSocketChannelHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
@Override
protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
System.out.println("收到消息：" + msg.text());
ctx.channel().writeAndFlush(new TextWebSocketFrame("服务器时间：" + LocalDateTime.now()));
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
System.out.println("handle added " + ctx.channel().id().asLongText());
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
System.out.println("handle removed " + ctx.channel().id().asLongText());
}
}
Client
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>WebSocket客户端</title>
</head>
<body>
<script type="text/javascript">
var socket;
if (window.WebSocket) {
socket = new WebSocket("ws://localhost:8888/ws");
socket.onmessage = function (event) {
var ta = document.getElementById("responseText");
ta.value = ta.value + "\n" + event.data;
}
socket.onopen = function (event) {
var ta = document.getElementById("responseText");
ta.value = "连接开启！";
}
socket.onclose = function (event) {
var ta = document.getElementById("responseText");
ta.value = ta.value + "\n" + "连接关闭！";
}
} else {
alert("浏览器不支持WebSocket！");
}
function send(message) {
if (!window.WebSocket) {
return;
}
if (socket.readyState == WebSocket.OPEN) {
socket.send(message);
} else {
alert("连接尚未开启！");
}
}
</script>
<form onsubmit="return false;">
<textarea name="message" style="width: 300px; height: 200px;"></textarea>
<input type="button" value="发送数据" onclick="send(this.form.message.value)">
<h3>服务端输出：</h3>
<textarea id="responseText" style="width: 300px; height: 300px"></textarea>
<input type="button" onclick="javascript:document.getElementById('responseText').value=''" value="清空内容 ">
</form>
</body>
</html>
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