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jsowell-netty/src/main/java/com/jsowell/netty/client/NettyClientHandler.java

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+package com.jsowell.netty.client;
+
+import com.jsowell.common.util.DateUtils;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelId;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * 客户端处理类
+ */
+@Slf4j
+public class NettyClientHandler extends ChannelInboundHandlerAdapter {
+
+	/**
+	 * 计算有多少客户端接入，第一个string为客户端ip
+	 */
+	private static final ConcurrentHashMap<ChannelId, ChannelHandlerContext> CLIENT_MAP = new ConcurrentHashMap<>();
+
+	@Override
+	public void channelActive(ChannelHandlerContext ctx) {
+		CLIENT_MAP.put(ctx.channel().id(), ctx);
+		log.info("ClientHandler Active");
+	}
+
+	/**
+	 * @param ctx
+	 * @author xiongchuan on 2019/4/28 16:10
+	 * @DESCRIPTION: 有服务端端终止连接服务器会触发此函数
+	 * @return: void
+	 */
+	@Override
+	public void channelInactive(ChannelHandlerContext ctx) {
+		ctx.close();
+		log.info("服务端终止了服务");
+	}
+
+	@Override
+	public void channelRead(ChannelHandlerContext ctx, Object msg) {
+		log.info("回写数据:" + msg);
+	}
+
+
+	@Override
+	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+		//cause.printStackTrace();
+		log.info("服务端发生异常【" + cause.getMessage() + "】");
+		ctx.close();
+	}
+
+	/**
+	 * @param msg       需要发送的消息内容
+	 * @param channelId 连接通道唯一id
+	 * @author xiongchuan on 2019/4/28 16:10
+	 * @DESCRIPTION: 客户端给服务端发送消息
+	 * @return: void
+	 */
+	public void channelWrite(ChannelId channelId, String msg) {
+		ChannelHandlerContext ctx = CLIENT_MAP.get(channelId);
+		if (ctx == null) {
+			log.info("通道【" + channelId + "】不存在");
+			return;
+		}
+		//将客户端的信息直接返回写入ctx
+		ctx.write(msg + " 时间：" + DateUtils.getTime());
+		//刷新缓存区
+		ctx.flush();
+	}
+}