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Netty实现WebSocket通信案例

2019/11/20 11:50 分类: 技术交流 浏览:1

功能介绍

  • Netty开发服务端HTML实现客户端
  • 实现服务端与客户端时实时交互

1 、导包

 
   

 

 

2 、工程配置文件:NettyConfig

 
   

 

 

3、MyWebSocketHandler

public class MyWebSocketHandler extends SimpleChannelInboundHandler<Object> { private 澳门mgm线上娱乐WebSocketServerHandshaker handshaker;

//请求路径

private static final String WEB_SOCKET_URL = "ws://localhost:8888/websocket";

 

//工程出现异常的时候调用@Override

public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

cause.printStackTrace(); ctx.close(); //关闭当前连接

}

 

//客户端与服务器创建连接的时候调用@Override

澳门mgm线上娱乐public void channelActive(ChannelHandlerContext ctx) throws Exception { NettyConfig.group.add(ctx.channel());

System.out.println("客户端与服务器连接开启");

}

//客户端与服务器断开连接的时候调用@Override

public void channelInactive(ChannelHandlerContext ctx) throws Exception { NettyConfig.group.remove(ctx.channel());

澳门mgm线上娱乐System.out.println("客户端与服务器断开连接");

}

//服务端接收客户端发送过来的数据结束之后调用@Override

public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { ctx.flush(); //进行数据清除

}

 

//服务端处理客户端调用的核心方法

protected void messageReceived(ChannelHandlerContext context, Object msg) throws Exception {

//处理客户端向服务端发起http握手请求业务if(msg instanceof FullHttpRequest){

handHttpRequest(context,(FullHttpRequest) msg);

}else if澳门mgm线上娱乐(msg instanceof WebSocketFrame){

//处理websocket连接业务handWebSocketFrme(context,(WebSocketFrame)msg);

}

}

 

/**

  • 处理客户端与服务端之前的websocket业务
  • @param ctx
  • @param frame

*/

 

private 澳门mgm线上娱乐void handWebSocketFrme(ChannelHandlerContext ctx,WebSocketFrame frame){

//判断是否是关闭websocket的指令

if(frame instanceof CloseWebSocketFrame){ handshaker.close(ctx.channel(),((CloseWebSocketFrame) frame).retain());

}

//判断是否是Ping消息

if(frame instanceof PingWebSocketFrame){

//返回一个胖信息

ctx.channel().write(new PongWebSocketFrame(frame.content().retain())); return;

}

//判断是否是二进制消息,如果是二进制消息,抛出异常if澳门mgm线上娱乐(!(frame instanceof TextWebSocketFrame)){

System.out.println("目前我们不支持二进制消息");

throw new 澳门mgm线上娱乐RuntimeException(this.getClass().getName()+"不支持的消息");

}

//返回应答消息

//澳门mgm线上娱乐获取客户端向服务端发送的消息

String request = ((TextWebSocketFrame)frame).text(); System.out.println("服务端收到客户端的消息===>"+request); TextWebSocketFrame tws = new TextWebSocketFrame(new

Date().to澳门mgm线上娱乐String()+ctx.channel().id()+"===>"+request);

//澳门mgm线上娱乐群发,服务端向每个上来的客户端群发消息NettyConfig.group.writeAndFlush(tws);

}

 

/**

  • 处理客户端向服务器发起http握手请求的业务
  • @param ctx
  • @param req

*/

private 澳门mgm线上娱乐void handHttpRequest(ChannelHandlerContext ctx,FullHttpRequest req){

//        req.headers().get()

//        req.decoderResult().isSuccess()

//不是websocket,就不是客户端发给服务器的Http请求if澳门mgm线上娱乐(!req.decoderResult().isSuccess()|| !

("websocket").equals(req.headers().get("Upgrade"))){

sendHttpResponse(ctx,req,new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.BAD_REQUEST));

return;

}

澳门mgm线上娱乐WebSocketServerHandshakerFactory wsFactory =

new WebSocketServerHandshakerFactory(WEB_SOCKET_URL,null,false); handshaker = wsFactory.newHandshaker(req);

if澳门mgm线上娱乐(handshaker==null){

 

澳门mgm线上娱乐WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());

}else{

handshaker.handshake(ctx.channel(),req);

}

}

 

/**

  • 服务端向客户端响应消息
  • @param ctx
  • @param req
  • @param res

 

 

 

4、初始化连接各个组件:MyWebSocketChannelHandler

/**

* 初始化连接各个组件

*/

public class MyWebSocketChannelHandler extends ChannelInitializer<SocketChannel> {

 

protected void initChannel(SocketChannel e) throws Exception { e.pipeline().addLast("http‐codec",new HttpServerCodec()); e.pipeline().addLast("aggregator",new HttpObjectAggregator(66636)); e.pipeline().addLast("http‐chunked",new ChunkedWriteHandler()); e.pipeline().addLast("handler",new MyWebSocketHandler());

}

}

 
   

 

5 、程序入口

 

/**

* 程序的入口,负责启动应用

*/

public class Main {

 

public static void main(String[] args) {  EventLoopGroup bossGroup = new NioEventLoopGroup(); EventLoopGroup workGroup = new NioEventLoopGroup(); try {

ServerBootstrap b = new ServerBootstrap(); b.group(bossGroup,workGroup); b.channel(NioServerSocketChannel.class); b.childHandler(new MyWebSocketChannelHandler());

System.out.println("服务端开启等待客户端连接");

Channel ch = b.bind(8888).sync().channel(); 

} catch (Exception e) {

澳门mgm线上娱乐e.printStackTrace();

} finally {

//优雅的退出程序bossGroup.shutdownGracefully(); workGroup.shutdownGracefully();

}

}

}

 
   

 

 

 

 

6 、web端测试代码

 

<!DOCTYPE html>

<html lang="en">

<head>

澳门mgm线上娱乐<meta charset="UTF‐8">

澳门mgm线上娱乐<title>WebSocket客户端</title>

</head>

澳门mgm线上娱乐<script>

var socket; if(!window.WebSocket){

澳门mgm线上娱乐window.WebSocket = window.MozWebSocket;

}

if(window.WebSocket){

socket = new WebSocket("ws://localhost:8888/websocket"); socket.onmessage = function (event) {

var ta = document.getElementById("responseContext"); ta.value += event.data +"\r\n";

}

socket.onopen = function (event) {

var 澳门mgm线上娱乐ta = document.getElementById("responseContext"); ta.value = "您浏览器支持webSoceket,请进行后续 操作\r\n";

}

 

socket.onclose = function (event) {

var ta = document.getElementById("responseContext"); ta.value = "";

ta.value = "webSoceket连接已经关闭";

}

}else{

console.debug("浏览器不支持webSocket")

}

 

function send() {

var message = document.getElementById("message").value; if(!window.WebSocket){

return;

}

if(socket.readyState == WebSocket.OPEN){ socket.send(message)

}else{

alert("连接没有建立成功!");

}

}

</script>

 

 

 

 
   

 

 

#标签:Netty,WebSocket通信