package com.lance.net.server.common;

import java.net.InetSocketAddress;

import org.springframework.stereotype.Component;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.concurrent.ImmediateEventExecutor;

@Component
public class ChatServer {
   private final ChannelGroup channelGroup = new DefaultChannelGroup(ImmediateEventExecutor.INSTANCE);
   private final EventLoopGroup bossGroup = new NioEventLoopGroup();
   private final EventLoopGroup workGroup = new NioEventLoopGroup();
   private Channel channel;

   public ChannelFuture start(InetSocketAddress address) {
      ServerBootstrap bootstrap = new ServerBootstrap();
      bootstrap.group(bossGroup, workGroup)
            .channel(NioServerSocketChannel.class)
            .childHandler(new ChatServerInitializer(channelGroup))
            .option(ChannelOption.SO_BACKLOG, 128)
            .childOption(ChannelOption.SO_KEEPALIVE, true);

      ChannelFuture future = bootstrap.bind(address).syncUninterruptibly();
      channel = future.channel();
      return future;
   }

   public void destroy() {
      if(channel != null) {
         channel.close();
      }

      channelGroup.close();
      workGroup.shutdownGracefully();
      bossGroup.shutdownGracefully();
   }

   public static void main(String[] args) {
      ChatServer server = new ChatServer();
      InetSocketAddress address = new InetSocketAddress("127.0.0.1", 9090);
      ChannelFuture future = server.start(address);

      Runtime.getRuntime().addShutdownHook(new Thread(){
         @Override
         public void run() {
            server.destroy();
         }
      });

      future.channel().closeFuture().syncUninterruptibly();
   }
}

package com.lance.net.server.common;

import java.util.concurrent.TimeUnit;

import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.group.ChannelGroup;
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.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.timeout.IdleStateHandler;

public class ChatServerInitializer extends ChannelInitializer<Channel>{
   private final ChannelGroup group;

   public ChatServerInitializer(ChannelGroup group) {
      this.group = group;
   }

   @Override
   protected void initChannel(Channel ch) throws Exception {
      ChannelPipeline pipeline = ch.pipeline();
      //处理日志
      pipeline.addLast(new LoggingHandler(LogLevel.INFO));

      //处理心跳
      pipeline.addLast(new IdleStateHandler(0, 0, 1800, TimeUnit.SECONDS));
      pipeline.addLast(new ChatHeartbeatHandler());

      pipeline.addLast(new HttpServerCodec());
      pipeline.addLast(new ChunkedWriteHandler());
      pipeline.addLast(new HttpObjectAggregator(64 * 1024));
      pipeline.addLast(new HttpRequestHandler("/ws"));
      pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));
      pipeline.addLast(new TextWebSocketFrameHandler(group));       
   }
}

package com.lance.net.server.common;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.util.CharsetUtil;

public class ChatHeartbeatHandler extends ChannelInboundHandlerAdapter{
   private Logger logger = LogManager.getLogger();
   private final ByteBuf HEARTBEAT_SEQUENCE = Unpooled.unreleasableBuffer(Unpooled.copiedBuffer("HB",CharsetUtil.UTF_8));

   @Override
   public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
      if(evt instanceof IdleStateEvent) {
         logger.info("====>Heartbeat: greater than {}", 180);
         ctx.writeAndFlush(HEARTBEAT_SEQUENCE.duplicate()).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
      }else {
         super.userEventTriggered(ctx, evt);
      }
   }
}

package com.lance.net.server.common;

import java.io.RandomAccessFile;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import io.netty.channel.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.lance.net.server.module.UserInfo;

import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http.QueryStringDecoder;
import io.netty.handler.ssl.SslHandler;
import io.netty.handler.stream.ChunkedNioFile;
import org.springframework.util.CollectionUtils;

public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
   private Logger loger = LogManager.getLogger();
   private final String webUri;
   private final String INDEX = "E:\\workspace\\test\\src\\main\\webapp\\index.html";
   /**用来保存channel*/
   public static Map<String, Channel> onlineChannels = new ConcurrentHashMap<>();

   public HttpRequestHandler(String webUri) {
      this.webUri = webUri;
   }

   @Override
   protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
      loger.info("===========> {}, {}", webUri, request.uri());

      String uri = StringUtils.substringBefore(request.uri(), "?");
      if(webUri.equalsIgnoreCase(uri)) {//获取webSocket参数
         QueryStringDecoder query = new QueryStringDecoder(request.uri());
         Map<String, List<String>> map = query.parameters();
         List<String> tokens = map.get("token");
         List<String> userIds = map.get("userId");

         //根据参数保存当前登录对象, 并把该token加入到channel中
         if(tokens != null && !tokens.isEmpty()) {
            String token = tokens.get(0);
            ChatConstants.addOnlines(token, new UserInfo(token));
            ctx.channel().attr(ChatConstants.CHANNEL_TOKEN_KEY).getAndSet(token);
         }
         //将channel放入map中,key为用户id，value为channel
         if(!CollectionUtils.isEmpty(userIds)){
            onlineChannels.put(userIds.get(0),ctx.channel());
         }

         request.setUri(uri);
         ctx.fireChannelRead(request.retain());
      }else {
         if(HttpUtil.is100ContinueExpected(request)) {
            send100ContinueExpected(ctx);
         }

         RandomAccessFile file = new RandomAccessFile(INDEX, "r");
         HttpResponse response = new DefaultHttpResponse(request.protocolVersion(), HttpResponseStatus.OK);
         response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain; charset=UTF-8");

         boolean keepAlive = HttpUtil.isKeepAlive(request);
         if(keepAlive) {
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, file.length());
            response.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);
         }
         ctx.write(response);

         if(ctx.pipeline().get(SslHandler.class) == null) {
            ctx.write(new DefaultFileRegion(file.getChannel(), 0, file.length()));
         }else {
            ctx.write(new ChunkedNioFile(file.getChannel()));
         }

         ChannelFuture future = ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
         if(!keepAlive) {
            future.addListener(ChannelFutureListener.CLOSE);
         }

         file.close();
      }
   }

   @Override
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
      cause.printStackTrace();
      ctx.close();
   }

   private void send100ContinueExpected(ChannelHandlerContext ctx) {
      FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.CONFLICT);
      ctx.writeAndFlush(response);      
   }
}

package com.lance.net.server.common;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.lance.net.server.module.ChatMessage;
import com.lance.net.server.module.UserInfo;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;

public class TextWebSocketFrameHandler extends SimpleChannelInboundHandler<TextWebSocketFrame>{
   private Logger loger = LogManager.getLogger();
   private final ChannelGroup group;

   public TextWebSocketFrameHandler(ChannelGroup group) {
      this.group = group;
   }

   @Override
   public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
      loger.info("Event====>{}", evt);

      if(evt instanceof WebSocketServerProtocolHandler.HandshakeComplete) {
         ctx.pipeline().remove(HttpRequestHandler.class);

         //加入当前, 上线人员推送前端，显示用户列表中去
         Channel channel = ctx.channel();
         ChatMessage message = new ChatMessage(null, "上线了");
         group.writeAndFlush(new TextWebSocketFrame(JSON.toJSONString(message,SerializerFeature.DisableCircularReferenceDetect)));
         group.add(channel);
      }else {
         super.userEventTriggered(ctx, evt);
      }
   }

   @Override
   protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
      Channel channel = ctx.channel();
      String token = channel.attr(ChatConstants.CHANNEL_TOKEN_KEY).get();
      UserInfo from = ChatConstants.onlines.get(token);
      if(from == null) {
         group.writeAndFlush("OK");
      }else {
         sendToAll(msg,from);
      }
   }

   /**
    * 广播
    * @param msg
    * @param from
    */
   private void sendToAll(TextWebSocketFrame msg,UserInfo from){
      ChatMessage message = new ChatMessage(from, msg.text());
      group.writeAndFlush(new TextWebSocketFrame(JSON.toJSONString(message,SerializerFeature.DisableCircularReferenceDetect)));
   }

   /**
    * 为指定用户发消息
    * @param msg
    * @param from
    * @param userId
    */
   public void sendToUser(TextWebSocketFrame msg,UserInfo from,String userId){
      ChatMessage message = new ChatMessage();
      message.setFrom(from);
      message.setMessage(msg.text());
      Channel channel = HttpRequestHandler.onlineChannels.get(userId);
      channel.writeAndFlush(JSON.toJSONString(message,SerializerFeature.DisableCircularReferenceDetect));
   }

   @Override
   public void channelInactive(ChannelHandlerContext ctx) throws Exception {
      loger.info("Current channel channelInactive");
      offlines(ctx);
   }

   @Override
   public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
      loger.info("Current channel handlerRemoved");
      offlines(ctx);
   }

   private void offlines(ChannelHandlerContext ctx) {
      Channel channel = ctx.channel();
      String token = channel.attr(ChatConstants.CHANNEL_TOKEN_KEY).get();
      ChatConstants.removeOnlines(token);

      group.remove(channel);
      ctx.close();
   }

   @Override
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
      loger.error("=====> {}", cause.getMessage());
      offlines(ctx);
   }
}

package com.lance.net.server.common;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.lang3.RandomUtils;
import org.apache.commons.lang3.StringUtils;

import com.lance.net.server.module.UserInfo;

import io.netty.util.AttributeKey;

public class ChatConstants {
    public static final AttributeKey<String> CHANNEL_TOKEN_KEY = AttributeKey.valueOf("netty.channel.token");  
   /**用来保存当前在线人员*/
   public static Map<String, UserInfo> onlines = new ConcurrentHashMap<>();

   public static void addOnlines(String sessionId, UserInfo val) {
      onlines.putIfAbsent(sessionId, val);
   }

   public static void removeOnlines(String sessionId) {
      if(StringUtils.isNotBlank(sessionId) && onlines.containsKey(sessionId)){
         onlines.remove(sessionId);
      }
   }

   private static char[]prefix = {'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y'};
   private static int[]imgPrefix = {1,2,3,4,5,6,7,8,9,10,11};

   public static String headImg() {
      int index = RandomUtils.nextInt(0, imgPrefix.length);
      return "/resources/img/head/"+imgPrefix[index]+".jpg";
   }

   public static String code() {
      int index = RandomUtils.nextInt(0, prefix.length);
      char prf = prefix[index];
      String len = (onlines.size()+1)+"";
      if(len.length() < 4) {
         len = StringUtils.leftPad(len, 4, '0');
      }
      return prf+len;
   }
}

package com.lance.net.server.module;

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

import com.alibaba.fastjson.annotation.JSONField;
import com.lance.net.server.common.ChatConstants;

public class ChatMessage {
   //发送消息则
   private UserInfo from;

   //发送内容
   private String message;

   //接收者列表
   private Map<String, UserInfo> to;

   //发送时间
   @JSONField(format="yyyy-MM-dd HH:mm:ss")
   private Date createTime;

   public ChatMessage() {

   }

   public ChatMessage(UserInfo from,String message) {
      this.from = from;
      this.message = message;
      this.to = ChatConstants.onlines;
      this.createTime = new Date();
   }

   public String getMessage() {
      return message;
   }

   public void setMessage(String message) {
      this.message = message;
   }

   public UserInfo getFrom() {
      return from;
   }

   public void setFrom(UserInfo from) {
      this.from = from;
   }

   public Map<String, UserInfo> getTo() {
      return to;
   }

   public void setTo(Map<String, UserInfo> to) {
      this.to = to;
   }

   public Date getCreateTime() {
      return createTime;
   }

   public void setCreateTime(Date createTime) {
      this.createTime = createTime;
   }
}

package com.lance.net.server.module;

import java.io.Serializable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import com.lance.net.server.common.ChatConstants;

public class UserInfo implements Serializable{
   private static final long serialVersionUID = 3562768188264006800L;
   public static Map<String, UserInfo> map = new ConcurrentHashMap<>();

   private Long id;

   private String phone;

   private String password;

   private String code;

   private String headImg;

   public UserInfo() {

   }

   public UserInfo(String phone) {
      this.phone = phone;
      this.headImg = ChatConstants.headImg();
      this.code = ChatConstants.code();
      this.id = System.currentTimeMillis();
   }

   public String getHeadImg() {
      return headImg;
   }

   public void setHeadImg(String headImg) {
      this.headImg = headImg;
   }

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   public String getPassword() {
      return password;
   }

   public void setPassword(String password) {
      this.password = password;
   }

   public String getPhone() {
      return phone;
   }

   public void setPhone(String phone) {
      this.phone = phone;
   }

   public String getCode() {
      return code;
   }

   public void setCode(String code) {
      this.code = code;
   }
}