目录
pom.xmo include jar
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.32.Final</version>
</dependency>
java code:
启动类：
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
/**
* netty websocket
*
* @author Administrator
*
*/
public class WebsocketServer {
public static void main(String[] args) throws InterruptedException {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new WebSocketChannelInitializer());
ChannelFuture channelFuture = serverBootstrap.bind(9999).sync();
channelFuture.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
初始化类：
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
public class WebSocketChannelInitializer extends
ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
// HttpServerCodec: 针对http协议进行编解码
pipeline.addLast("httpServerCodec", new HttpServerCodec());
// ChunkedWriteHandler分块写处理，文件过大会将内存撑爆
pipeline.addLast("chunkedWriteHandler", new ChunkedWriteHandler());
/**
* 作用是将一个Http的消息组装成一个完成的HttpRequest或者HttpResponse，那么具体的是什么 取决于是请求还是响应,
* 该Handler必须放在HttpServerCodec后的后面
*/
pipeline.addLast("httpObjectAggregator", new HttpObjectAggregator(8192));
// 用于处理websocket, /ws为访问websocket时的uri
pipeline.addLast("webSocketServerProtocolHandler", new WebSocketServerProtocolHandler("/ws"));
pipeline.addLast("myWebSocketHandler", new WebSocketHandler());
}
}
通道类：
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import java.time.LocalDateTime;
public class WebSocketHandler extends SimpleChannelInboundHandler<TextWebSocketFrame>{
@Override
protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
Channel channel = ctx.channel();
System.out.println(channel.remoteAddress() + ": " + msg.text());
ctx.channel().writeAndFlush(new TextWebSocketFrame("来自服务端: " + LocalDateTime.now()));
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
System.out.println("ChannelId" + ctx.channel().id().asLongText());
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
System.out.println("用户下线: " + ctx.channel().id().asLongText());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
ctx.channel().close();
}
}
html code
前段代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>netwebsocketClient</title>
</head>
<body>
<form onsubmit="return false" style="border:1px solid #000;padding: 5px; width:500px;">
<span><h2 style="margin-left:80px;">NettyWebSocketClientTest</h2></span>
<h3>发送内容</h3>
<textarea style="width: 300px; height: 200px;" name="message"></textarea>
<input type="button" onclick="sendMsg(this.form.message.value)" value="发送"><br>
<h3>消息</h3>
<textarea style="width: 300px; height: 200px;" id="respMessage"></textarea>
<input type="button" value="清空" onclick="javascript:document.getElementById('respMessage').value = ''">
</form>
</body>
<script type="text/javascript">
var websocket;
//如果浏览器支持WebSocket
if (window.WebSocket) {
websocket = new WebSocket("ws://localhost:9999/ws"); //获得WebSocket对象
//当有消息过来的时候触发
websocket.onmessage = function (event) {
var respMessage = document.getElementById("respMessage");
respMessage.value = respMessage.value + "\n" + event.data;
}
//连接关闭的时候触发
websocket.onclose = function (event) {
var respMessage = document.getElementById("respMessage");
respMessage.value = respMessage.value + "\n断开连接";
}
//连接打开的时候触发
websocket.onopen = function (event) {
var respMessage = document.getElementById("respMessage");
respMessage.value = "建立连接";
}
} else {
alert("浏览器不支持WebSocket");
}
function sendMsg(msg) { //发送消息
if (window.WebSocket) {
if (websocket.readyState == WebSocket.OPEN) { //如果WebSocket是打开状态
websocket.send(msg); //send()发送消息
}
} else {
return;
}
}
</script>
</html>
页面图片：
日志：
21:55:29.410 [nioEventLoopGroup-2-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x68ceae04, L:/0:0:0:0:0:0:0:0:9999] READ: [id: 0x79ac2f78, L:/0:0:0:0:0:0:0:1:9999 - R:/0:0:0:0:0:0:0:1:60125]
21:55:29.410 [nioEventLoopGroup-2-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x68ceae04, L:/0:0:0:0:0:0:0:0:9999] READ COMPLETE
ChannelId00000000000000e0-00001ef8-00000016-d02f897192e1fe02-79ac2f78
21:55:29.413 [nioEventLoopGroup-3-6] DEBUG io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker - [id: 0x79ac2f78, L:/0:0:0:0:0:0:0:1:9999 - R:/0:0:0:0:0:0:0:1:60125] WebSocket version V13 server handshake
21:55:29.413 [nioEventLoopGroup-3-6] DEBUG io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker - WebSocket version 13 server handshake key: maAo4fEjermRPnmAK6BheA==, response: APIPEtlUWOcsvYnRHU2+s/id+BI=
21:55:38.227 [nioEventLoopGroup-3-6] DEBUG io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder - Decoding WebSocket Frame opCode=1
21:55:38.228 [nioEventLoopGroup-3-6] DEBUG io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder - Decoding WebSocket Frame length=10
/0:0:0:0:0:0:0:1:60125: helloword
21:55:38.228 [nioEventLoopGroup-3-6] DEBUG io.netty.handler.codec.http.websocketx.WebSocket08FrameEncoder - Encoding WebSocket Frame opCode=1 length=40
总结介绍：
- java由netty websocket 实现
- 包括三个类一个启动类，一个初始化类，一个通道类都可以通过netty官网看介绍
- html由websocket实现
- netty官网netty.io/
- htmlwebsocket 可以通过网络搜索获取到内部规则
ok
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