一、pom.xml依赖配置
<!-- netty -->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.50.Final</version>
</dependency>
二、代码
2.1、NettyServer 类
package com.wangjing.socket.server;
import com.wangjing.socket.handler.CoordinationSocketHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
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 CoordinationNettyServer {
private final int port;
public CoordinationNettyServer(int port) {
this.port = port;
}
public void start() throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup group = new NioEventLoopGroup();
try {
ServerBootstrap sb = new ServerBootstrap();
sb.option(ChannelOption.SO_BACKLOG, 1024);
sb.group(group, bossGroup) // 绑定线程池
.channel(NioServerSocketChannel.class) // 指定使用的channel
.localAddress(this.port)// 绑定监听端口
.childHandler(new ChannelInitializer<SocketChannel>() { // 绑定客户端连接时候触发操作
@Override
protected void initChannel(SocketChannel ch) throws Exception {
//websocket协议本身是基于http协议的,所以这边也要使用http解编码器
ch.pipeline().addLast(new HttpServerCodec());
//以块的方式来写的处理器
ch.pipeline().addLast(new ChunkedWriteHandler());
ch.pipeline().addLast(new HttpObjectAggregator(8192));
ch.pipeline().addLast(new WebSocketServerProtocolHandler("/ws", "WebSocket", true, 65536 * 10));
ch.pipeline().addLast(new CoordinationSocketHandler());//自定义消息处理类
}
});
ChannelFuture cf = sb.bind().sync(); // 服务器异步创建绑定
System.out.println(CoordinationNettyServer.class + "已启动,正在监听: " + cf.channel().localAddress());
cf.channel().closeFuture().sync(); // 关闭服务器通道
} finally {
group.shutdownGracefully().sync(); // 释放线程池资源
bossGroup.shutdownGracefully().sync();
}
}
}
2.2、SocketHandler 类
package com.wangjing.socket.handler;
import com.wangjing.socket.pool.CoordinationChannelHandlerPool;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
public class CoordinationSocketHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println("与客户端建立连接,通道开启!");
//添加到channelGroup通道组
CoordinationChannelHandlerPool.channelGroup.add(ctx.channel());
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
System.out.println("与客户端断开连接,通道关闭!");
//从channelGroup通道组删除
CoordinationChannelHandlerPool.channelGroup.remove(ctx.channel());
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
//接收的消息
System.out.println(String.format("收到客户端%s的数据:%s", ctx.channel().id(), msg.text()));
// 单独发消息
// sendMessage(ctx);
// 群发消息
sendAllMessage();
}
private void sendMessage(ChannelHandlerContext ctx) throws InterruptedException {
String message = "我是服务器,你好呀";
ctx.writeAndFlush(new TextWebSocketFrame("hello"));
}
private void sendAllMessage() {
String message = "我是服务器,这是群发消息";
CoordinationChannelHandlerPool.channelGroup.writeAndFlush(new TextWebSocketFrame(message));
}
}
2.3、ChannelHandlerPool 类
package com.wangjing.socket.pool;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;
public class CoordinationChannelHandlerPool {
public CoordinationChannelHandlerPool() {
}
//可以存储userId与ChannelId的映射表
// public static ConcurrentHashMap<String, ChannelId> channelIdMap = new ConcurrentHashMap<>();
//channelGroup通道组
public static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
}
2.4、Application启动类
package com.wangjing.socket;
import com.wangjing.socket.server.CoordinationNettyServer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication(scanBasePackages = "com.wangjing")
public class SocketApplication {
public static void main(String[] args) {
SpringApplication.run(SocketApplication.class, args);
try {
new CoordinationNettyServer(8804).start();
} catch (Exception e) {
System.out.println("NettyServerError:" + e.getMessage());
}
}
}
三、测试
websocket 在线测试推荐:在线websocket测试-online tool-postjson
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