netty搭建socket服务端,接收客户端数据,主动发送数据给客户端

以前项目中用到的netty服务端,现分享出来;

服务端主动发送数据给客户端端,本代码在NioServer类中维护了个map集合用来存储连接的客户端;map的key为客户端发送过来报文中的id(这里你也可以使用ctx.channel().id()相关业务自己实现);

1.netty版本4.1.25

     <!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.25.Final</version>
        </dependency>

2.NioServer服务端

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * @Title: NioServer
 * @Description: nio服务端
 * @date 2018/6/415:28
 */
public class NioServer {

  //  private static final Logger logger = LoggerFactory.getLogger(NioServer.class);
    //连接map
    public  static Map<String, ChannelHandlerContext> map = new HashMap<String, ChannelHandlerContext>();
    //默认端口
    private Integer defaultPort=8000;
    public void bind(Integer port) throws Exception {
        //配置服务端的NIO线程组
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup