NIO 服务端TCP连接管理的方案

　　　　　　　ServerSocketChannel serverChannel = ServerSocketChannel.open();
            serverChannel.bind(new InetSocketAddress("127.0.0.2",1234));
            serverChannel.configureBlocking(false);
            AnalyisUtil util=new AnalyisUtil();
            RedisConnectionPool connectionPool=new RedisConnectionPool();
            Selector selector = Selector.open();
            SelectionKey key = serverChannel.register(selector, SelectionKey.OP_ACCEPT);
            while (true) {
                int select = selector.select();
                if (select > 0) {
                    Set<SelectionKey> selectedKeys = selector.selectedKeys();
                    Iterator<SelectionKey> iterator = selectedKeys.iterator();
                    while (iterator.hasNext()) {
                        SelectionKey selectionKey = iterator.next();
                        iterator.remove();
                        // 接收连接请求
                        if (selectionKey.isAcceptable()) {
                            ServerSocketChannel channel = (ServerSocketChannel) selectionKey
                                    .channel();
                            SocketChannel socketChannel = channel.accept();
                            logger.info("接收到一个新的连接请求"+ socketChannel.getRemoteAddress().toString());
                            socketChannel.configureBlocking(false);
                            //每接收请求，注册到同一个selector中处理
                            socketChannel.register(selector, SelectionKey.OP_READ);
　　　　　　　　　　　　　　　　  //在Redis中存储连接的时间，以SocketChannel的HashCode作为Key
                            connectionPool.getJedis().set("LST_"+socketChannel.hashCode(),new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
　　　　　　　　　　　　　　　　　//将SocketChannel放入HashSet中管理
                            connectedSokectList.add(socketChannel);
                        } else if (selectionKey.isReadable()) {
                            //执行读事件，在读事件的处理函数中，重新以SocketChannel的HashCode再次存储事件，以刷新时间
                            util.handleReadEvent(selectionKey,messageQueue,logger);
                        }
                    }
                }
            }

package ConnectionSystem;

import Util.RedisConnectionPool;
import org.apache.log4j.Logger;
import redis.clients.jedis.Jedis;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.SocketChannel;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;

public class ConnectionManagerTask implements Runnable {
    private HashSet<SocketChannel> connectedSokectList;
    private long keepalive_Time=5000;
    private Logger logger=Logger.getLogger(ConnectionManagerTask.class);

    ConnectionManagerTask(HashSet<SocketChannel> list){
        logger.info("TCP监听已经启动... ...");
        this.connectedSokectList=list;
    }

    private long cucalateIsAlive(Date lastSendTime) throws ParseException {
        Date currentTime=new Date();
        return currentTime.getTime()-lastSendTime.getTime();
    }

    private boolean handleSocket(SocketChannel channel){
        int channel_code= channel.hashCode();
        RedisConnectionPool connectionPool=new RedisConnectionPool();
        Jedis jedisCilent;
        SocketAddress ipLocation;
        try{
            ipLocation=channel.getRemoteAddress();
            jedisCilent=connectionPool.getJedis();
            String SendTime=jedisCilent.get("LST_"+channel_code);
            if(SendTime!=null) {
                SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                Date lastSendTime = dfs.parse(SendTime);
                if (cucalateIsAlive(lastSendTime) > keepalive_Time) {
                    //超过时间
                    try {
                        if(channel.isConnected()){
                            channel.close();
                            jedisCilent.del("LST_"+channel_code);
                            logger.debug("连接被TCP管理线程关闭，ip:" + ipLocation + ",上次回应时间：" + lastSendTime);
                        }else {
                            logger.debug("当前通道，ip:" + ipLocation + "已经关闭... ..."+ ",上次回应时间：" + lastSendTime);
                        }
                        return true;
                    } catch (IOException e) {
                        logger.error("通道，ip:" + ipLocation + "关闭时发生了异常",e);
                    }
                }else {
                    return false;
                }
            }
            if(channel.isConnected()){
                channel.close();
                logger.debug("连接被TCP管理线程关闭，ip:" + ipLocation + "：未检测到登陆时间... ...");
            }else {
                logger.debug("当前通道，ip:" + ipLocation + "已经关闭... ...");
            }

        }catch (Exception e){
            logger.error("通道关闭时发生了异常",e);
        }
        return true;
    }

    @Override
    public void run() {
        logger.info("当前连接数"+connectedSokectList.size());
        if(connectedSokectList.isEmpty()){
            return;
        }
        Iterator<SocketChannel> iterator = connectedSokectList.iterator();
        while (iterator.hasNext()){
            SocketChannel socketChannel=iterator.next();
            Boolean removeFlag=handleSocket(socketChannel);
            if(removeFlag){
                iterator.remove();
            }
        }
    }
}