{"id":61611,"date":"2026-01-18T06:49:28","date_gmt":"2026-01-17T22:49:28","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/61611.html"},"modified":"2026-01-18T06:49:28","modified_gmt":"2026-01-17T22:49:28","slug":"java%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%ef%bc%88%e4%b8%83%ef%bc%89%ef%bc%9anio%e5%ae%9e%e6%88%98%e6%9e%84%e5%bb%ba%e9%ab%98%e6%80%a7%e8%83%bdsocket%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/61611.html","title":{"rendered":"Java\u7f51\u7edc\u7f16\u7a0b\uff08\u4e03\uff09\uff1aNIO\u5b9e\u6218\u6784\u5efa\u9ad8\u6027\u80fdSocket\u670d\u52a1\u5668"},"content":{"rendered":"

1. \u5355\u7ebf\u7a0bNIO\u670d\u52a1\u5668\u67b6\u6784\u8bbe\u8ba1<\/h3>\n

1.1 \u67b6\u6784\u8bbe\u8ba1\u539f\u5219<\/h4>\n

\u5355\u7ebf\u7a0bNIO\u670d\u52a1\u5668\u7684\u6838\u5fc3\u601d\u60f3\u662f\u4f7f\u7528\u4e00\u4e2a\u7ebf\u7a0b\u901a\u8fc7Selector\u76d1\u63a7\u591a\u4e2a\u901a\u9053\u7684I\/O\u4e8b\u4ef6，\u5b9e\u73b0\u9ad8\u5e76\u53d1\u5904\u7406\u3002\u8fd9\u79cd\u67b6\u6784\u5177\u6709\u4ee5\u4e0b\u4f18\u52bf：<\/p>\n

  • \u8d44\u6e90\u6548\u7387：\u907f\u514d\u4e86\u4f20\u7edf\u591a\u7ebf\u7a0b\u6a21\u578b\u4e2d\u7ebf\u7a0b\u521b\u5efa\u548c\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u5f00\u9500<\/li>\n
  • \u5185\u5b58\u5360\u7528\u4f4e：\u5355\u7ebf\u7a0b\u6a21\u578b\u663e\u8457\u51cf\u5c11\u4e86\u5185\u5b58\u6d88\u8017<\/li>\n
  • \u65e0\u9501\u8bbe\u8ba1：\u907f\u514d\u4e86\u591a\u7ebf\u7a0b\u540c\u6b65\u7684\u590d\u6742\u6027<\/li>\n
  • \u53ef\u9884\u6d4b\u6027\u80fd：\u6027\u80fd\u8868\u73b0\u66f4\u52a0\u7a33\u5b9a\u548c\u53ef\u9884\u6d4b<\/li>\n

    1.2 \u6838\u5fc3\u7ec4\u4ef6\u8bbe\u8ba1<\/h4>\n

    \u5355\u7ebf\u7a0bNIO\u670d\u52a1\u5668\u7684\u67b6\u6784\u5305\u542b\u4ee5\u4e0b\u6838\u5fc3\u7ec4\u4ef6：<\/p>\n\n\u7ec4\u4ef6\u804c\u8d23\u5b9e\u73b0\u8981\u70b9<\/tr>\n\n\n\n\n\n\n
    Selector<\/td>\n\u76d1\u63a7\u591a\u4e2a\u901a\u9053\u7684I\/O\u4e8b\u4ef6<\/td>\n\u4f7f\u7528epoll\u7b49\u9ad8\u6548\u673a\u5236<\/td>\n<\/tr>\n
    ServerSocketChannel<\/td>\n\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42<\/td>\n\u914d\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f<\/td>\n<\/tr>\n
    SocketChannel<\/td>\n\u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e\u4f20\u8f93<\/td>\n\u7ba1\u7406\u8bfb\u5199\u7f13\u51b2\u533a<\/td>\n<\/tr>\n
    ByteBuffer<\/td>\n\u6570\u636e\u7f13\u51b2\u533a\u7ba1\u7406<\/td>\n\u5408\u7406\u5206\u914d\u76f4\u63a5\/\u5806\u7f13\u51b2\u533a<\/td>\n<\/tr>\n
    \u4e8b\u4ef6\u5904\u7406\u5668<\/td>\n\u5904\u7406\u5177\u4f53\u7684I\/O\u4e8b\u4ef6<\/td>\n\u5b9e\u73b0\u4e1a\u52a1\u903b\u8f91\u5206\u79bb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    1.3 \u670d\u52a1\u5668\u67b6\u6784\u5b9e\u73b0<\/h4>\n

    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u5355\u7ebf\u7a0bNIO\u670d\u52a1\u5668\u67b6\u6784\u5b9e\u73b0：<\/p>\n

    public<\/span> class<\/span> NioSocketServer<\/span> {<\/span>
    \n private<\/span> static<\/span> final<\/span> int<\/span> DEFAULT_PORT =<\/span> 8080<\/span>;<\/span>
    \n private<\/span> static<\/span> final<\/span> int<\/span> BUFFER_SIZE =<\/span> 1024<\/span>;<\/span><\/p>\n

    private<\/span> Selector<\/span> selector;<\/span>
    \n private<\/span> ServerSocketChannel<\/span> serverChannel;<\/span>
    \n private<\/span> volatile<\/span> boolean<\/span> running =<\/span> false<\/span>;<\/span><\/p>\n

    \/\/ \u8fde\u63a5\u7ba1\u7406<\/span>
    \n private<\/span> final<\/span> Map<\/span><<\/span>SocketChannel<\/span>,<\/span> ClientConnection<\/span>><\/span><\/span> connections =<\/span> new<\/span> ConcurrentHashMap<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    public<\/span> void<\/span> start<\/span>(<\/span>int<\/span> port)<\/span> throws<\/span> IOException<\/span> {<\/span>
    \n \/\/ \u521d\u59cb\u5316Selector<\/span>
    \n selector =<\/span> Selector<\/span>.<\/span>open<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u521b\u5efaServerSocketChannel<\/span>
    \n serverChannel =<\/span> ServerSocketChannel<\/span>.<\/span>open<\/span>(<\/span>)<\/span>;<\/span>
    \n serverChannel.<\/span>configureBlocking<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n serverChannel.<\/span>bind<\/span>(<\/span>new<\/span> InetSocketAddress<\/span>(<\/span>port)<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u6ce8\u518c\u63a5\u53d7\u8fde\u63a5\u4e8b\u4ef6<\/span>
    \n serverChannel.<\/span>register<\/span>(<\/span>selector,<\/span> SelectionKey<\/span>.<\/span>OP_ACCEPT)<\/span>;<\/span><\/p>\n

    running =<\/span> true<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u7269\u8054\u7f51\u5e73\u53f0NIO\u670d\u52a1\u5668\u542f\u52a8，\u76d1\u542c\u7aef\u53e3: "<\/span> +<\/span> port)<\/span>;<\/span><\/p>\n

    \/\/ \u542f\u52a8\u4e8b\u4ef6\u5faa\u73af<\/span>
    \n eventLoop<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    private<\/span> void<\/span> eventLoop<\/span>(<\/span>)<\/span> {<\/span>
    \n while<\/span> (<\/span>running)<\/span> {<\/span>
    \n try<\/span> {<\/span>
    \n \/\/ \u963b\u585e\u7b49\u5f85\u4e8b\u4ef6，\u8d85\u65f6\u65f6\u95f41\u79d2<\/span>
    \n int<\/span> readyChannels =<\/span> selector.<\/span>select<\/span>(<\/span>1000<\/span>)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>readyChannels ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n \/\/ \u5904\u7406\u8d85\u65f6\u903b\u8f91，\u5982\u5fc3\u8df3\u68c0\u6d4b<\/span>
    \n handleTimeout<\/span>(<\/span>)<\/span>;<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u5904\u7406\u5c31\u7eea\u4e8b\u4ef6<\/span>
    \n Iterator<\/span><<\/span>SelectionKey<\/span>><\/span><\/span> keyIterator =<\/span> selector.<\/span>selectedKeys<\/span>(<\/span>)<\/span>.<\/span>iterator<\/span>(<\/span>)<\/span>;<\/span>
    \n while<\/span> (<\/span>keyIterator.<\/span>hasNext<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n SelectionKey<\/span> key =<\/span> keyIterator.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>
    \n keyIterator.<\/span>remove<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>!<\/span>key.<\/span>isValid<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n continue<\/span>;<\/span>
    \n }<\/span><\/p>\n

    try<\/span> {<\/span>
    \n if<\/span> (<\/span>key.<\/span>isAcceptable<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n handleAccept<\/span>(<\/span>key)<\/span>;<\/span>
    \n }<\/span> else<\/span> if<\/span> (<\/span>key.<\/span>isReadable<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n handleRead<\/span>(<\/span>key)<\/span>;<\/span>
    \n }<\/span> else<\/span> if<\/span> (<\/span>key.<\/span>isWritable<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n handleWrite<\/span>(<\/span>key)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
    \n handleException<\/span>(<\/span>key,<\/span> e)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n }<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
    \n System<\/span>.<\/span>err.<\/span>println<\/span>(<\/span>"\u4e8b\u4ef6\u5faa\u73af\u5f02\u5e38: "<\/span> +<\/span> e.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    public<\/span> void<\/span> stop<\/span>(<\/span>)<\/span> {<\/span>
    \n running =<\/span> false<\/span>;<\/span>
    \n if<\/span> (<\/span>selector !=<\/span> null<\/span>)<\/span> {<\/span>
    \n selector.<\/span>wakeup<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    1.4 \u6027\u80fd\u4f18\u5316\u7b56\u7565<\/h4>\n

    \u5728\u7269\u8054\u7f51\u5e73\u53f0\u7684\u5b9e\u9645\u5e94\u7528\u4e2d，\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u4f18\u5316\u7b56\u7565：<\/p>\n

  • \u7f13\u51b2\u533a\u6c60\u5316：\u91cd\u7528ByteBuffer\u5bf9\u8c61，\u51cf\u5c11GC\u538b\u529b<\/li>\n
  • \u76f4\u63a5\u5185\u5b58\u4f7f\u7528：\u5bf9\u4e8e\u5927\u6570\u636e\u4f20\u8f93\u4f7f\u7528DirectByteBuffer<\/li>\n
  • \u6279\u91cf\u5904\u7406：\u5c06\u591a\u4e2a\u5c0f\u7684\u5199\u64cd\u4f5c\u5408\u5e76\u4e3a\u6279\u91cf\u64cd\u4f5c<\/li>\n
  • \u96f6\u62f7\u8d1d\u6280\u672f：\u4f7f\u7528FileChannel.transferTo()\u7b49\u96f6\u62f7\u8d1dAPI<\/li>\n

    2. \u4e8b\u4ef6\u9a71\u52a8\u7f16\u7a0b\u6a21\u578b\u5b9e\u73b0<\/h3>\n

    2.1 \u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u6982\u8ff0<\/h4>\n

    \u4e8b\u4ef6\u9a71\u52a8\u7f16\u7a0b\u6a21\u578b\u662fNIO\u670d\u52a1\u5668\u7684\u6838\u5fc3，\u5b83\u5c06\u4f20\u7edf\u7684\u963b\u585e\u5f0f\u7f16\u7a0b\u8f6c\u6362\u4e3a\u57fa\u4e8e\u4e8b\u4ef6\u7684\u54cd\u5e94\u5f0f\u7f16\u7a0b\u3002\u5728\u8fd9\u79cd\u6a21\u578b\u4e2d，\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\u7531\u5916\u90e8\u4e8b\u4ef6\u9a71\u52a8，\u800c\u4e0d\u662f\u6309\u7167\u9884\u5b9a\u7684\u987a\u5e8f\u6267\u884c\u3002<\/p>\n

    2.2 \u4e8b\u4ef6\u7c7b\u578b\u5b9a\u4e49<\/h4>\n

    \u5728\u7269\u8054\u7f51\u5e73\u53f0\u7684NIO\u670d\u52a1\u5668\u4e2d，\u4e3b\u8981\u5904\u7406\u4ee5\u4e0b\u4e8b\u4ef6\u7c7b\u578b：<\/p>\n\n\u4e8b\u4ef6\u7c7b\u578b\u89e6\u53d1\u6761\u4ef6\u5904\u7406\u7b56\u7565<\/tr>\n\n\n\n\n\n
    ACCEPT<\/td>\n\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42<\/td>\n\u63a5\u53d7\u8fde\u63a5\u5e76\u6ce8\u518c\u8bfb\u4e8b\u4ef6<\/td>\n<\/tr>\n
    READ<\/td>\n\u901a\u9053\u6709\u6570\u636e\u53ef\u8bfb<\/td>\n\u8bfb\u53d6\u6570\u636e\u5e76\u89e3\u6790\u534f\u8bae<\/td>\n<\/tr>\n
    WRITE<\/td>\n\u901a\u9053\u53ef\u5199\u5165\u6570\u636e<\/td>\n\u53d1\u9001\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e<\/td>\n<\/tr>\n
    CONNECT<\/td>\n\u5ba2\u6237\u7aef\u8fde\u63a5\u5b8c\u6210<\/td>\n\u6ce8\u518c\u8bfb\u5199\u4e8b\u4ef6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    2.3 \u4e8b\u4ef6\u5904\u7406\u5668\u5b9e\u73b0<\/h4>\n

    public<\/span> class<\/span> EventHandler<\/span> {<\/span>
    \n private<\/span> final<\/span> ProtocolDecoder<\/span> decoder =<\/span> new<\/span> ProtocolDecoder<\/span>(<\/span>)<\/span>;<\/span>
    \n private<\/span> final<\/span> ProtocolEncoder<\/span> encoder =<\/span> new<\/span> ProtocolEncoder<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    public<\/span> void<\/span> handleAccept<\/span>(<\/span>SelectionKey<\/span> key)<\/span> throws<\/span> IOException<\/span> {<\/span>
    \n ServerSocketChannel<\/span> serverChannel =<\/span> (<\/span>ServerSocketChannel<\/span>)<\/span> key.<\/span>channel<\/span>(<\/span>)<\/span>;<\/span>
    \n SocketChannel<\/span> clientChannel =<\/span> serverChannel.<\/span>accept<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>clientChannel !=<\/span> null<\/span>)<\/span> {<\/span>
    \n \/\/ \u914d\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f<\/span>
    \n clientChannel.<\/span>configureBlocking<\/span>(<\/span>false<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u521b\u5efa\u5ba2\u6237\u7aef\u8fde\u63a5\u5bf9\u8c61<\/span>
    \n ClientConnection<\/span> connection =<\/span> new<\/span> ClientConnection<\/span>(<\/span>clientChannel)<\/span>;<\/span><\/p>\n

    \/\/ \u6ce8\u518c\u8bfb\u4e8b\u4ef6<\/span>
    \n SelectionKey<\/span> clientKey =<\/span> clientChannel.<\/span>register<\/span>(<\/span>key.<\/span>selector<\/span>(<\/span>)<\/span>,<\/span> SelectionKey<\/span>.<\/span>OP_READ)<\/span>;<\/span>
    \n clientKey.<\/span>attach<\/span>(<\/span>connection)<\/span>;<\/span><\/p>\n

    \/\/ \u8bb0\u5f55\u8fde\u63a5<\/span>
    \n connections.<\/span>put<\/span>(<\/span>clientChannel,<\/span> connection)<\/span>;<\/span><\/p>\n

    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5: "<\/span> +<\/span> clientChannel.<\/span>getRemoteAddress<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    public<\/span> void<\/span> handleRead<\/span>(<\/span>SelectionKey<\/span> key)<\/span> throws<\/span> IOException<\/span> {<\/span>
    \n SocketChannel<\/span> channel =<\/span> (<\/span>SocketChannel<\/span>)<\/span> key.<\/span>channel<\/span>(<\/span>)<\/span>;<\/span>
    \n ClientConnection<\/span> connection =<\/span> (<\/span>ClientConnection<\/span>)<\/span> key.<\/span>attachment<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    ByteBuffer<\/span> buffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>BUFFER_SIZE)<\/span>;<\/span>
    \n int<\/span> bytesRead =<\/span> channel.<\/span>read<\/span>(<\/span>buffer)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>bytesRead ==<\/span> –<\/span>1<\/span>)<\/span> {<\/span>
    \n \/\/ \u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5<\/span>
    \n closeConnection<\/span>(<\/span>key)<\/span>;<\/span>
    \n return<\/span>;<\/span>
    \n }<\/span><\/p>\n

    if<\/span> (<\/span>bytesRead ><\/span> 0<\/span>)<\/span> {<\/span>
    \n buffer.<\/span>flip<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u5c06\u6570\u636e\u6dfb\u52a0\u5230\u8fde\u63a5\u7684\u63a5\u6536\u7f13\u51b2\u533a<\/span>
    \n connection.<\/span>appendReceiveBuffer<\/span>(<\/span>buffer)<\/span>;<\/span><\/p>\n

    \/\/ \u5c1d\u8bd5\u89e3\u6790\u5b8c\u6574\u6d88\u606f<\/span>
    \n List<\/span><<\/span>Message<\/span>><\/span><\/span> messages =<\/span> decoder.<\/span>decode<\/span>(<\/span>connection.<\/span>getReceiveBuffer<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    for<\/span> (<\/span>Message<\/span> message :<\/span> messages)<\/span> {<\/span>
    \n \/\/ \u5904\u7406\u4e1a\u52a1\u903b\u8f91<\/span>
    \n processMessage<\/span>(<\/span>connection,<\/span> message)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    public<\/span> void<\/span> handleWrite<\/span>(<\/span>SelectionKey<\/span> key)<\/span> throws<\/span> IOException<\/span> {<\/span>
    \n SocketChannel<\/span> channel =<\/span> (<\/span>SocketChannel<\/span>)<\/span> key.<\/span>channel<\/span>(<\/span>)<\/span>;<\/span>
    \n ClientConnection<\/span> connection =<\/span> (<\/span>ClientConnection<\/span>)<\/span> key.<\/span>attachment<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    ByteBuffer<\/span> sendBuffer =<\/span> connection.<\/span>getSendBuffer<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>sendBuffer.<\/span>hasRemaining<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n int<\/span> bytesWritten =<\/span> channel.<\/span>write<\/span>(<\/span>sendBuffer)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>bytesWritten ><\/span> 0<\/span>)<\/span> {<\/span>
    \n connection.<\/span>updateLastActiveTime<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u5982\u679c\u53d1\u9001\u7f13\u51b2\u533a\u5df2\u7a7a，\u53d6\u6d88\u5199\u4e8b\u4ef6\u5173\u6ce8<\/span>
    \n if<\/span> (<\/span>!<\/span>sendBuffer.<\/span>hasRemaining<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n key.<\/span>interestOps<\/span>(<\/span>key.<\/span>interestOps<\/span>(<\/span>)<\/span> &<\/span> ~<\/span>SelectionKey<\/span>.<\/span>OP_WRITE)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    private<\/span> void<\/span> processMessage<\/span>(<\/span>ClientConnection<\/span> connection,<\/span> Message<\/span> message)<\/span> {<\/span>
    \n \/\/ \u6839\u636e\u6d88\u606f\u7c7b\u578b\u5904\u7406\u4e1a\u52a1\u903b\u8f91<\/span>
    \n switch<\/span> (<\/span>message.<\/span>getType<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n case<\/span> DEVICE_DATA:<\/span>
    \n handleDeviceData<\/span>(<\/span>connection,<\/span> message)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> HEARTBEAT:<\/span>
    \n handleHeartbeat<\/span>(<\/span>connection,<\/span> message)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> COMMAND:<\/span>
    \n handleCommand<\/span>(<\/span>connection,<\/span> message)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n default<\/span>:<\/span>
    \n System<\/span>.<\/span>err.<\/span>println<\/span>(<\/span>"\u672a\u77e5\u6d88\u606f\u7c7b\u578b: "<\/span> +<\/span> message.<\/span>getType<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    2.4 \u5f02\u6b65\u54cd\u5e94\u673a\u5236<\/h4>\n

    \u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\u7684\u4e00\u4e2a\u91cd\u8981\u7279\u70b9\u662f\u5f02\u6b65\u54cd\u5e94\u3002\u5f53\u9700\u8981\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u65f6，\u4e0d\u662f\u7acb\u5373\u5199\u5165，\u800c\u662f\u5c06\u6570\u636e\u653e\u5165\u53d1\u9001\u7f13\u51b2\u533a，\u5e76\u6ce8\u518c\u5199\u4e8b\u4ef6：<\/p>\n

    public<\/span> void<\/span> sendMessage<\/span>(<\/span>ClientConnection<\/span> connection,<\/span> Message<\/span> message)<\/span> {<\/span>
    \n try<\/span> {<\/span>
    \n ByteBuffer<\/span> encodedData =<\/span> encoder.<\/span>encode<\/span>(<\/span>message)<\/span>;<\/span>
    \n connection.<\/span>appendSendBuffer<\/span>(<\/span>encodedData)<\/span>;<\/span><\/p>\n

    \/\/ \u6ce8\u518c\u5199\u4e8b\u4ef6<\/span>
    \n SelectionKey<\/span> key =<\/span> connection.<\/span>getChannel<\/span>(<\/span>)<\/span>.<\/span>keyFor<\/span>(<\/span>selector)<\/span>;<\/span>
    \n if<\/span> (<\/span>key !=<\/span> null<\/span> &&<\/span> key.<\/span>isValid<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n key.<\/span>interestOps<\/span>(<\/span>key.<\/span>interestOps<\/span>(<\/span>)<\/span> |<\/span> SelectionKey<\/span>.<\/span>OP_WRITE)<\/span>;<\/span>
    \n selector.<\/span>wakeup<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u5524\u9192selector<\/span>
    \n }<\/span>
    \n }<\/span> catch<\/span> (<\/span>Exception<\/span> e)<\/span> {<\/span>
    \n System<\/span>.<\/span>err.<\/span>println<\/span>(<\/span>"\u53d1\u9001\u6d88\u606f\u5931\u8d25: "<\/span> +<\/span> e.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    3. \u7c98\u5305\u62c6\u5305\u95ee\u9898\u7684\u5904\u7406\u65b9\u6848<\/h3>\n

    3.1 \u7c98\u5305\u62c6\u5305\u95ee\u9898\u5206\u6790<\/h4>\n

    \u5728TCP\u901a\u4fe1\u4e2d，\u7531\u4e8eTCP\u662f\u9762\u5411\u6d41\u7684\u534f\u8bae，\u53d1\u9001\u65b9\u53d1\u9001\u7684\u591a\u4e2a\u6570\u636e\u5305\u53ef\u80fd\u88ab\u63a5\u6536\u65b9\u4f5c\u4e3a\u4e00\u4e2a\u6570\u636e\u5305\u63a5\u6536（\u7c98\u5305），\u6216\u8005\u4e00\u4e2a\u6570\u636e\u5305\u53ef\u80fd\u88ab\u5206\u6210\u591a\u4e2a\u6570\u636e\u5305\u63a5\u6536（\u62c6\u5305）\u3002\u8fd9\u5728\u7269\u8054\u7f51\u5e73\u53f0\u7684\u8bbe\u5907\u901a\u4fe1\u4e2d\u662f\u4e00\u4e2a\u5e38\u89c1\u95ee\u9898\u3002<\/p>\n

    \u7c98\u5305\u73b0\u8c61：<\/p>\n

      \n
    • \u53d1\u9001\u65b9\u53d1\u9001: [\u6570\u636e\u5305A][\u6570\u636e\u5305B]<\/li>\n
    • \u63a5\u6536\u65b9\u63a5\u6536: [\u6570\u636e\u5305A+\u6570\u636e\u5305B]<\/li>\n<\/ul>\n

      \u62c6\u5305\u73b0\u8c61：<\/p>\n

        \n
      • \u53d1\u9001\u65b9\u53d1\u9001: [\u6570\u636e\u5305A]<\/li>\n
      • \u63a5\u6536\u65b9\u63a5\u6536: [\u6570\u636e\u5305A\u7684\u524d\u534a\u90e8\u5206] [\u6570\u636e\u5305A\u7684\u540e\u534a\u90e8\u5206]<\/li>\n<\/ul>\n

        3.2 \u89e3\u51b3\u65b9\u6848\u8bbe\u8ba1<\/h4>\n

        \u5e38\u7528\u7684\u89e3\u51b3\u65b9\u6848\u5305\u62ec：<\/p>\n\n\u65b9\u6848\u539f\u7406\u4f18\u70b9\u7f3a\u70b9<\/tr>\n\n\n\n\n\n
        \u56fa\u5b9a\u957f\u5ea6<\/td>\n\u6bcf\u4e2a\u6d88\u606f\u56fa\u5b9a\u5b57\u8282\u6570<\/td>\n\u5b9e\u73b0\u7b80\u5355<\/td>\n\u6d6a\u8d39\u5e26\u5bbd<\/td>\n<\/tr>\n
        \u5206\u9694\u7b26<\/td>\n\u4f7f\u7528\u7279\u6b8a\u5b57\u7b26\u5206\u9694\u6d88\u606f<\/td>\n\u5b9e\u73b0\u7b80\u5355<\/td>\n\u9700\u8981\u8f6c\u4e49\u5904\u7406<\/td>\n<\/tr>\n
        \u957f\u5ea6\u524d\u7f00<\/td>\n\u6d88\u606f\u5934\u5305\u542b\u6d88\u606f\u957f\u5ea6<\/td>\n\u6548\u7387\u9ad8，\u65e0\u6b67\u4e49<\/td>\n\u5b9e\u73b0\u7a0d\u590d\u6742<\/td>\n<\/tr>\n
        \u81ea\u5b9a\u4e49\u534f\u8bae<\/td>\n\u590d\u6742\u7684\u534f\u8bae\u5934\u7ed3\u6784<\/td>\n\u529f\u80fd\u5f3a\u5927<\/td>\n\u5b9e\u73b0\u590d\u6742<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        3.3 \u957f\u5ea6\u524d\u7f00\u65b9\u6848\u5b9e\u73b0<\/h4>\n

        \u5728\u7269\u8054\u7f51\u5e73\u53f0\u4e2d，\u63a8\u8350\u4f7f\u7528\u957f\u5ea6\u524d\u7f00\u65b9\u6848，\u534f\u8bae\u683c\u5f0f\u5982\u4e0b：<\/p>\n

        +——–+——–+——–+——–+——–+…+——–+
        \n| Length | Type | Flag | SeqId | Data… |
        \n+——–+——–+——–+——–+——–+…+——–+
        \n| 4 | 2 | 1 | 4 | Length-11 |
        \n+——–+——–+——–+——–+——–+…+——–+<\/p>\n

        \u534f\u8bae\u89e3\u7801\u5668\u5b9e\u73b0：<\/p>\n

        public<\/span> class<\/span> ProtocolDecoder<\/span> {<\/span>
        \n private<\/span> static<\/span> final<\/span> int<\/span> HEADER_LENGTH =<\/span> 11<\/span>;<\/span> \/\/ 4+2+1+4<\/span>
        \n private<\/span> static<\/span> final<\/span> int<\/span> MAX_MESSAGE_LENGTH =<\/span> 1024<\/span> *<\/span> 1024<\/span>;<\/span> \/\/ 1MB<\/span><\/p>\n

        public<\/span> List<\/span><<\/span>Message<\/span>><\/span><\/span> decode<\/span>(<\/span>ByteBuffer<\/span> buffer)<\/span> {<\/span>
        \n List<\/span><<\/span>Message<\/span>><\/span><\/span> messages =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        while<\/span> (<\/span>buffer.<\/span>remaining<\/span>(<\/span>)<\/span> >=<\/span> HEADER_LENGTH)<\/span> {<\/span>
        \n \/\/ \u6807\u8bb0\u5f53\u524d\u4f4d\u7f6e<\/span>
        \n buffer.<\/span>mark<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u8bfb\u53d6\u6d88\u606f\u957f\u5ea6<\/span>
        \n int<\/span> messageLength =<\/span> buffer.<\/span>getInt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u9a8c\u8bc1\u6d88\u606f\u957f\u5ea6<\/span>
        \n if<\/span> (<\/span>messageLength <<\/span> HEADER_LENGTH ||<\/span> messageLength ><\/span> MAX_MESSAGE_LENGTH)<\/span> {<\/span>
        \n throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>"\u65e0\u6548\u7684\u6d88\u606f\u957f\u5ea6: "<\/span> +<\/span> messageLength)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        \/\/ \u68c0\u67e5\u662f\u5426\u6709\u5b8c\u6574\u6d88\u606f<\/span>
        \n if<\/span> (<\/span>buffer.<\/span>remaining<\/span>(<\/span>)<\/span> <<\/span> messageLength –<\/span> 4<\/span>)<\/span> {<\/span>
        \n \/\/ \u6d88\u606f\u4e0d\u5b8c\u6574，\u91cd\u7f6e\u4f4d\u7f6e<\/span>
        \n buffer.<\/span>reset<\/span>(<\/span>)<\/span>;<\/span>
        \n break<\/span>;<\/span>
        \n }<\/span><\/p>\n

        \/\/ \u8bfb\u53d6\u6d88\u606f\u5934<\/span>
        \n short<\/span> messageType =<\/span> buffer.<\/span>getShort<\/span>(<\/span>)<\/span>;<\/span>
        \n byte<\/span> flag =<\/span> buffer.<\/span>get<\/span>(<\/span>)<\/span>;<\/span>
        \n int<\/span> sequenceId =<\/span> buffer.<\/span>getInt<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u8bfb\u53d6\u6d88\u606f\u4f53<\/span>
        \n int<\/span> dataLength =<\/span> messageLength –<\/span> HEADER_LENGTH;<\/span>
        \n byte<\/span>[<\/span>]<\/span> data =<\/span> new<\/span> byte<\/span>[<\/span>dataLength]<\/span>;<\/span>
        \n buffer.<\/span>get<\/span>(<\/span>data)<\/span>;<\/span><\/p>\n

        \/\/ \u521b\u5efa\u6d88\u606f\u5bf9\u8c61<\/span>
        \n Message<\/span> message =<\/span> new<\/span> Message<\/span>(<\/span>messageType,<\/span> flag,<\/span> sequenceId,<\/span> data)<\/span>;<\/span>
        \n messages.<\/span>add<\/span>(<\/span>message)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        \/\/ \u538b\u7f29\u7f13\u51b2\u533a，\u79fb\u9664\u5df2\u5904\u7406\u7684\u6570\u636e<\/span>
        \n buffer.<\/span>compact<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        return<\/span> messages;<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        3.4 \u7f13\u51b2\u533a\u7ba1\u7406\u7b56\u7565<\/h4>\n

        \u4e3a\u4e86\u9ad8\u6548\u5904\u7406\u7c98\u5305\u62c6\u5305\u95ee\u9898，\u9700\u8981\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u7ef4\u62a4\u63a5\u6536\u7f13\u51b2\u533a：<\/p>\n

        public<\/span> class<\/span> ClientConnection<\/span> {<\/span>
        \n private<\/span> final<\/span> SocketChannel<\/span> channel;<\/span>
        \n private<\/span> final<\/span> ByteBuffer<\/span> receiveBuffer;<\/span>
        \n private<\/span> final<\/span> ByteBuffer<\/span> sendBuffer;<\/span>
        \n private<\/span> long<\/span> lastActiveTime;<\/span><\/p>\n

        public<\/span> ClientConnection<\/span>(<\/span>SocketChannel<\/span> channel)<\/span> {<\/span>
        \n this<\/span>.<\/span>channel =<\/span> channel;<\/span>
        \n this<\/span>.<\/span>receiveBuffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>8192<\/span>)<\/span>;<\/span> \/\/ 8KB\u63a5\u6536\u7f13\u51b2\u533a<\/span>
        \n this<\/span>.<\/span>sendBuffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>8192<\/span>)<\/span>;<\/span> \/\/ 8KB\u53d1\u9001\u7f13\u51b2\u533a<\/span>
        \n this<\/span>.<\/span>lastActiveTime =<\/span> System<\/span>.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> appendReceiveBuffer<\/span>(<\/span>ByteBuffer<\/span> data)<\/span> {<\/span>
        \n \/\/ \u786e\u4fdd\u7f13\u51b2\u533a\u6709\u8db3\u591f\u7a7a\u95f4<\/span>
        \n if<\/span> (<\/span>receiveBuffer.<\/span>remaining<\/span>(<\/span>)<\/span> <<\/span> data.<\/span>remaining<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n \/\/ \u6269\u5c55\u7f13\u51b2\u533a\u6216\u538b\u7f29\u73b0\u6709\u6570\u636e<\/span>
        \n expandOrCompactBuffer<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        receiveBuffer.<\/span>put<\/span>(<\/span>data)<\/span>;<\/span>
        \n updateLastActiveTime<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> expandOrCompactBuffer<\/span>(<\/span>)<\/span> {<\/span>
        \n receiveBuffer.<\/span>flip<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        if<\/span> (<\/span>receiveBuffer.<\/span>remaining<\/span>(<\/span>)<\/span> ><\/span> 0<\/span>)<\/span> {<\/span>
        \n \/\/ \u5982\u679c\u8fd8\u6709\u672a\u5904\u7406\u7684\u6570\u636e，\u521b\u5efa\u66f4\u5927\u7684\u7f13\u51b2\u533a<\/span>
        \n ByteBuffer<\/span> newBuffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>receiveBuffer.<\/span>capacity<\/span>(<\/span>)<\/span> *<\/span> 2<\/span>)<\/span>;<\/span>
        \n newBuffer.<\/span>put<\/span>(<\/span>receiveBuffer)<\/span>;<\/span>
        \n this<\/span>.<\/span>receiveBuffer =<\/span> newBuffer;<\/span>
        \n }<\/span> else<\/span> {<\/span>
        \n \/\/ \u5982\u679c\u6ca1\u6709\u672a\u5904\u7406\u7684\u6570\u636e，\u76f4\u63a5\u6e05\u7a7a<\/span>
        \n receiveBuffer.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        public<\/span> ByteBuffer<\/span> getReceiveBuffer<\/span>(<\/span>)<\/span> {<\/span>
        \n receiveBuffer.<\/span>flip<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> receiveBuffer;<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        3.5 \u534f\u8bae\u7f16\u7801\u5668\u5b9e\u73b0<\/h4>\n

        public<\/span> class<\/span> ProtocolEncoder<\/span> {<\/span><\/p>\n

        public<\/span> ByteBuffer<\/span> encode<\/span>(<\/span>Message<\/span> message)<\/span> {<\/span>
        \n byte<\/span>[<\/span>]<\/span> data =<\/span> message.<\/span>getData<\/span>(<\/span>)<\/span>;<\/span>
        \n int<\/span> totalLength =<\/span> 11<\/span> +<\/span> data.<\/span>length;<\/span> \/\/ \u5934\u90e811\u5b57\u8282 + \u6570\u636e\u957f\u5ea6<\/span><\/p>\n

        ByteBuffer<\/span> buffer =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>totalLength)<\/span>;<\/span><\/p>\n

        \/\/ \u5199\u5165\u6d88\u606f\u957f\u5ea6<\/span>
        \n buffer.<\/span>putInt<\/span>(<\/span>totalLength)<\/span>;<\/span><\/p>\n

        \/\/ \u5199\u5165\u6d88\u606f\u7c7b\u578b<\/span>
        \n buffer.<\/span>putShort<\/span>(<\/span>message.<\/span>getType<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u5199\u5165\u6807\u5fd7\u4f4d<\/span>
        \n buffer.<\/span>put<\/span>(<\/span>message.<\/span>getFlag<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u5199\u5165\u5e8f\u5217\u53f7<\/span>
        \n buffer.<\/span>putInt<\/span>(<\/span>message.<\/span>getSequenceId<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u5199\u5165\u6570\u636e<\/span>
        \n buffer.<\/span>put<\/span>(<\/span>data)<\/span>;<\/span><\/p>\n

        buffer.<\/span>flip<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> buffer;<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        4. \u5f02\u5e38\u5904\u7406\u548c\u8fde\u63a5\u7ba1\u7406\u7b56\u7565<\/h3>\n

        4.1 \u5f02\u5e38\u5206\u7c7b\u548c\u5904\u7406\u7b56\u7565<\/h4>\n

        \u5728NIO\u670d\u52a1\u5668\u4e2d，\u5f02\u5e38\u5904\u7406\u662f\u4fdd\u8bc1\u7cfb\u7edf\u7a33\u5b9a\u6027\u7684\u5173\u952e\u3002\u5f02\u5e38\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u7c7b：<\/p>\n\n\u5f02\u5e38\u7c7b\u578b\u5904\u7406\u7b56\u7565\u5f71\u54cd\u8303\u56f4<\/tr>\n\n\n\n\n\n
        \u7f51\u7edc\u5f02\u5e38<\/td>\n\u5173\u95ed\u8fde\u63a5，\u6e05\u7406\u8d44\u6e90<\/td>\n\u5355\u4e2a\u8fde\u63a5<\/td>\n<\/tr>\n
        \u534f\u8bae\u5f02\u5e38<\/td>\n\u8bb0\u5f55\u65e5\u5fd7，\u53d1\u9001\u9519\u8bef\u54cd\u5e94<\/td>\n\u5355\u4e2a\u8fde\u63a5<\/td>\n<\/tr>\n
        \u7cfb\u7edf\u5f02\u5e38<\/td>\n\u8bb0\u5f55\u65e5\u5fd7，\u7ee7\u7eed\u8fd0\u884c<\/td>\n\u6574\u4e2a\u670d\u52a1\u5668<\/td>\n<\/tr>\n
        \u8d44\u6e90\u5f02\u5e38<\/td>\n\u91ca\u653e\u8d44\u6e90，\u964d\u7ea7\u670d\u52a1<\/td>\n\u6574\u4e2a\u670d\u52a1\u5668<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        4.2 \u5f02\u5e38\u5904\u7406\u5b9e\u73b0<\/h4>\n

        public<\/span> class<\/span> ExceptionHandler<\/span> {<\/span>
        \n private<\/span> static<\/span> final<\/span> Logger<\/span> logger =<\/span> LoggerFactory<\/span>.<\/span>getLogger<\/span>(<\/span>ExceptionHandler<\/span>.<\/span>class<\/span>)<\/span>;<\/span><\/p>\n

        public<\/span> void<\/span> handleException<\/span>(<\/span>SelectionKey<\/span> key,<\/span> Exception<\/span> e)<\/span> {<\/span>
        \n SocketChannel<\/span> channel =<\/span> (<\/span>SocketChannel<\/span>)<\/span> key.<\/span>channel<\/span>(<\/span>)<\/span>;<\/span>
        \n ClientConnection<\/span> connection =<\/span> (<\/span>ClientConnection<\/span>)<\/span> key.<\/span>attachment<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        if<\/span> (<\/span>e instanceof<\/span> IOException<\/span>)<\/span> {<\/span>
        \n \/\/ \u7f51\u7edcI\/O\u5f02\u5e38，\u901a\u5e38\u8868\u793a\u8fde\u63a5\u65ad\u5f00<\/span>
        \n handleNetworkException<\/span>(<\/span>key,<\/span> connection,<\/span> (<\/span>IOException<\/span>)<\/span> e)<\/span>;<\/span>
        \n }<\/span> else<\/span> if<\/span> (<\/span>e instanceof<\/span> ProtocolException<\/span>)<\/span> {<\/span>
        \n \/\/ \u534f\u8bae\u89e3\u6790\u5f02\u5e38<\/span>
        \n handleProtocolException<\/span>(<\/span>key,<\/span> connection,<\/span> (<\/span>ProtocolException<\/span>)<\/span> e)<\/span>;<\/span>
        \n }<\/span> else<\/span> {<\/span>
        \n \/\/ \u5176\u4ed6\u672a\u77e5\u5f02\u5e38<\/span>
        \n handleUnknownException<\/span>(<\/span>key,<\/span> connection,<\/span> e)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> handleNetworkException<\/span>(<\/span>SelectionKey<\/span> key,<\/span> ClientConnection<\/span> connection,<\/span> IOException<\/span> e)<\/span> {<\/span>
        \n logger.<\/span>warn<\/span>(<\/span>"\u7f51\u7edc\u5f02\u5e38，\u5173\u95ed\u8fde\u63a5: {}"<\/span>,<\/span> connection.<\/span>getRemoteAddress<\/span>(<\/span>)<\/span>,<\/span> e)<\/span>;<\/span>
        \n closeConnection<\/span>(<\/span>key)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> handleProtocolException<\/span>(<\/span>SelectionKey<\/span> key,<\/span> ClientConnection<\/span> connection,<\/span> ProtocolException<\/span> e)<\/span> {<\/span>
        \n logger.<\/span>error<\/span>(<\/span>"\u534f\u8bae\u5f02\u5e38: {}"<\/span>,<\/span> e.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u53d1\u9001\u9519\u8bef\u54cd\u5e94<\/span>
        \n Message<\/span> errorResponse =<\/span> createErrorResponse<\/span>(<\/span>e.<\/span>getErrorCode<\/span>(<\/span>)<\/span>,<\/span> e.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
        \n sendMessage<\/span>(<\/span>connection,<\/span> errorResponse)<\/span>;<\/span><\/p>\n

        \/\/ \u6839\u636e\u9519\u8bef\u4e25\u91cd\u7a0b\u5ea6\u51b3\u5b9a\u662f\u5426\u5173\u95ed\u8fde\u63a5<\/span>
        \n if<\/span> (<\/span>e.<\/span>isFatal<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n closeConnection<\/span>(<\/span>key)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> handleUnknownException<\/span>(<\/span>SelectionKey<\/span> key,<\/span> ClientConnection<\/span> connection,<\/span> Exception<\/span> e)<\/span> {<\/span>
        \n logger.<\/span>error<\/span>(<\/span>"\u672a\u77e5\u5f02\u5e38"<\/span>,<\/span> e)<\/span>;<\/span>
        \n closeConnection<\/span>(<\/span>key)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> closeConnection<\/span>(<\/span>SelectionKey<\/span> key)<\/span> {<\/span>
        \n try<\/span> {<\/span>
        \n SocketChannel<\/span> channel =<\/span> (<\/span>SocketChannel<\/span>)<\/span> key.<\/span>channel<\/span>(<\/span>)<\/span>;<\/span>
        \n ClientConnection<\/span> connection =<\/span> (<\/span>ClientConnection<\/span>)<\/span> key.<\/span>attachment<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u4ece\u8fde\u63a5\u7ba1\u7406\u5668\u4e2d\u79fb\u9664<\/span>
        \n connections.<\/span>remove<\/span>(<\/span>channel)<\/span>;<\/span><\/p>\n

        \/\/ \u53d6\u6d88SelectionKey<\/span>
        \n key.<\/span>cancel<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u5173\u95ed\u901a\u9053<\/span>
        \n channel.<\/span>close<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        logger.<\/span>info<\/span>(<\/span>"\u8fde\u63a5\u5df2\u5173\u95ed: {}"<\/span>,<\/span> connection.<\/span>getRemoteAddress<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
        \n }<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
        \n logger.<\/span>warn<\/span>(<\/span>"\u5173\u95ed\u8fde\u63a5\u65f6\u53d1\u751f\u5f02\u5e38"<\/span>,<\/span> e)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        4.3 \u8fde\u63a5\u751f\u547d\u5468\u671f\u7ba1\u7406<\/h4>\n

        \u5728\u7269\u8054\u7f51\u5e73\u53f0\u4e2d，\u8bbe\u5907\u8fde\u63a5\u7684\u751f\u547d\u5468\u671f\u7ba1\u7406\u81f3\u5173\u91cd\u8981：<\/p>\n

        public<\/span> class<\/span> ConnectionManager<\/span> {<\/span>
        \n private<\/span> final<\/span> Map<\/span><<\/span>String<\/span>,<\/span> ClientConnection<\/span>><\/span><\/span> deviceConnections =<\/span> new<\/span> ConcurrentHashMap<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
        \n private<\/span> final<\/span> ScheduledExecutorService<\/span> scheduler =<\/span> Executors<\/span>.<\/span>newScheduledThreadPool<\/span>(<\/span>2<\/span>)<\/span>;<\/span><\/p>\n

        \/\/ \u8fde\u63a5\u8d85\u65f6\u65f6\u95f4（\u6beb\u79d2）<\/span>
        \n private<\/span> static<\/span> final<\/span> long<\/span> CONNECTION_TIMEOUT =<\/span> 300_000<\/span>;<\/span> \/\/ 5\u5206\u949f<\/span>
        \n private<\/span> static<\/span> final<\/span> long<\/span> HEARTBEAT_INTERVAL =<\/span> 60_000<\/span>;<\/span> \/\/ 1\u5206\u949f<\/span><\/p>\n

        public<\/span> void<\/span> start<\/span>(<\/span>)<\/span> {<\/span>
        \n \/\/ \u542f\u52a8\u5fc3\u8df3\u68c0\u6d4b\u4efb\u52a1<\/span>
        \n scheduler.<\/span>scheduleAtFixedRate<\/span>(<\/span>this<\/span>::<\/span>checkHeartbeat<\/span>,<\/span>
        \n HEARTBEAT_INTERVAL,<\/span> HEARTBEAT_INTERVAL,<\/span> TimeUnit<\/span>.<\/span>MILLISECONDS)<\/span>;<\/span><\/p>\n

        \/\/ \u542f\u52a8\u8fde\u63a5\u6e05\u7406\u4efb\u52a1<\/span>
        \n scheduler.<\/span>scheduleAtFixedRate<\/span>(<\/span>this<\/span>::<\/span>cleanupTimeoutConnections<\/span>,<\/span>
        \n CONNECTION_TIMEOUT,<\/span> CONNECTION_TIMEOUT,<\/span> TimeUnit<\/span>.<\/span>MILLISECONDS)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> registerConnection<\/span>(<\/span>String<\/span> deviceId,<\/span> ClientConnection<\/span> connection)<\/span> {<\/span>
        \n deviceConnections.<\/span>put<\/span>(<\/span>deviceId,<\/span> connection)<\/span>;<\/span>
        \n connection.<\/span>setDeviceId<\/span>(<\/span>deviceId)<\/span>;<\/span>
        \n logger.<\/span>info<\/span>(<\/span>"\u8bbe\u5907\u8fde\u63a5\u6ce8\u518c: {}"<\/span>,<\/span> deviceId)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> unregisterConnection<\/span>(<\/span>String<\/span> deviceId)<\/span> {<\/span>
        \n ClientConnection<\/span> connection =<\/span> deviceConnections.<\/span>remove<\/span>(<\/span>deviceId)<\/span>;<\/span>
        \n if<\/span> (<\/span>connection !=<\/span> null<\/span>)<\/span> {<\/span>
        \n logger.<\/span>info<\/span>(<\/span>"\u8bbe\u5907\u8fde\u63a5\u6ce8\u9500: {}"<\/span>,<\/span> deviceId)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> checkHeartbeat<\/span>(<\/span>)<\/span> {<\/span>
        \n long<\/span> currentTime =<\/span> System<\/span>.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        for<\/span> (<\/span>ClientConnection<\/span> connection :<\/span> deviceConnections.<\/span>values<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n long<\/span> lastActiveTime =<\/span> connection.<\/span>getLastActiveTime<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        if<\/span> (<\/span>currentTime –<\/span> lastActiveTime ><\/span> HEARTBEAT_INTERVAL *<\/span> 2<\/span>)<\/span> {<\/span>
        \n \/\/ \u53d1\u9001\u5fc3\u8df3\u8bf7\u6c42<\/span>
        \n sendHeartbeatRequest<\/span>(<\/span>connection)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> cleanupTimeoutConnections<\/span>(<\/span>)<\/span> {<\/span>
        \n long<\/span> currentTime =<\/span> System<\/span>.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span>;<\/span>
        \n List<\/span><<\/span>String<\/span>><\/span><\/span> timeoutDevices =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        for<\/span> (<\/span>Map.<\/span>Entry<\/span><<\/span>String<\/span>,<\/span> ClientConnection<\/span>><\/span><\/span> entry :<\/span> deviceConnections.<\/span>entrySet<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n ClientConnection<\/span> connection =<\/span> entry.<\/span>getValue<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        if<\/span> (<\/span>currentTime –<\/span> connection.<\/span>getLastActiveTime<\/span>(<\/span>)<\/span> ><\/span> CONNECTION_TIMEOUT)<\/span> {<\/span>
        \n timeoutDevices.<\/span>add<\/span>(<\/span>entry.<\/span>getKey<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        \/\/ \u6e05\u7406\u8d85\u65f6\u8fde\u63a5<\/span>
        \n for<\/span> (<\/span>String<\/span> deviceId :<\/span> timeoutDevices)<\/span> {<\/span>
        \n ClientConnection<\/span> connection =<\/span> deviceConnections.<\/span>get<\/span>(<\/span>deviceId)<\/span>;<\/span>
        \n if<\/span> (<\/span>connection !=<\/span> null<\/span>)<\/span> {<\/span>
        \n logger.<\/span>warn<\/span>(<\/span>"\u8bbe\u5907\u8fde\u63a5\u8d85\u65f6，\u5f3a\u5236\u5173\u95ed: {}"<\/span>,<\/span> deviceId)<\/span>;<\/span>
        \n forceCloseConnection<\/span>(<\/span>connection)<\/span>;<\/span>
        \n unregisterConnection<\/span>(<\/span>deviceId)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        private<\/span> void<\/span> sendHeartbeatRequest<\/span>(<\/span>ClientConnection<\/span> connection)<\/span> {<\/span>
        \n Message<\/span> heartbeat =<\/span> new<\/span> Message<\/span>(<\/span>MessageType<\/span>.<\/span>HEARTBEAT_REQUEST,<\/span> (<\/span>byte<\/span>)<\/span> 0<\/span>,<\/span>
        \n generateSequenceId<\/span>(<\/span>)<\/span>,<\/span> new<\/span> byte<\/span>[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
        \n sendMessage<\/span>(<\/span>connection,<\/span> heartbeat)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> shutdown<\/span>(<\/span>)<\/span> {<\/span>
        \n scheduler.<\/span>shutdown<\/span>(<\/span>)<\/span>;<\/span>
        \n try<\/span> {<\/span>
        \n if<\/span> (<\/span>!<\/span>scheduler.<\/span>awaitTermination<\/span>(<\/span>5<\/span>,<\/span> TimeUnit<\/span>.<\/span>SECONDS)<\/span>)<\/span> {<\/span>
        \n scheduler.<\/span>shutdownNow<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span> catch<\/span> (<\/span>InterruptedException<\/span> e)<\/span> {<\/span>
        \n scheduler.<\/span>shutdownNow<\/span>(<\/span>)<\/span>;<\/span>
        \n Thread<\/span>.<\/span>currentThread<\/span>(<\/span>)<\/span>.<\/span>interrupt<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        4.4 \u8d44\u6e90\u76d1\u63a7\u548c\u9650\u6d41<\/h4>\n

        \u4e3a\u4e86\u9632\u6b62\u8d44\u6e90\u8017\u5c3d，\u9700\u8981\u5b9e\u73b0\u8fde\u63a5\u6570\u9650\u5236\u548c\u8d44\u6e90\u76d1\u63a7：<\/p>\n

        public<\/span> class<\/span> ResourceMonitor<\/span> {<\/span>
        \n private<\/span> static<\/span> final<\/span> int<\/span> MAX_CONNECTIONS =<\/span> 10000<\/span>;<\/span>
        \n private<\/span> static<\/span> final<\/span> long<\/span> MAX_MEMORY_USAGE =<\/span> 512<\/span> *<\/span> 1024<\/span> *<\/span> 1024<\/span>;<\/span> \/\/ 512MB<\/span><\/p>\n

        private<\/span> final<\/span> AtomicInteger<\/span> connectionCount =<\/span> new<\/span> AtomicInteger<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
        \n private<\/span> final<\/span> MemoryMXBean<\/span> memoryBean =<\/span> ManagementFactory<\/span>.<\/span>getMemoryMXBean<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        public<\/span> boolean<\/span> canAcceptNewConnection<\/span>(<\/span>)<\/span> {<\/span>
        \n \/\/ \u68c0\u67e5\u8fde\u63a5\u6570\u9650\u5236<\/span>
        \n if<\/span> (<\/span>connectionCount.<\/span>get<\/span>(<\/span>)<\/span> >=<\/span> MAX_CONNECTIONS)<\/span> {<\/span>
        \n logger.<\/span>warn<\/span>(<\/span>"\u8fde\u63a5\u6570\u5df2\u8fbe\u4e0a\u9650: {}"<\/span>,<\/span> MAX_CONNECTIONS)<\/span>;<\/span>
        \n return<\/span> false<\/span>;<\/span>
        \n }<\/span><\/p>\n

        \/\/ \u68c0\u67e5\u5185\u5b58\u4f7f\u7528\u60c5\u51b5<\/span>
        \n MemoryUsage<\/span> heapUsage =<\/span> memoryBean.<\/span>getHeapMemoryUsage<\/span>(<\/span>)<\/span>;<\/span>
        \n if<\/span> (<\/span>heapUsage.<\/span>getUsed<\/span>(<\/span>)<\/span> ><\/span> MAX_MEMORY_USAGE)<\/span> {<\/span>
        \n logger.<\/span>warn<\/span>(<\/span>"\u5185\u5b58\u4f7f\u7528\u5df2\u8fbe\u4e0a\u9650: {}MB"<\/span>,<\/span> MAX_MEMORY_USAGE \/<\/span> 1024<\/span> \/<\/span> 1024<\/span>)<\/span>;<\/span>
        \n return<\/span> false<\/span>;<\/span>
        \n }<\/span><\/p>\n

        return<\/span> true<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> onConnectionAccepted<\/span>(<\/span>)<\/span> {<\/span>
        \n connectionCount.<\/span>incrementAndGet<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> onConnectionClosed<\/span>(<\/span>)<\/span> {<\/span>
        \n connectionCount.<\/span>decrementAndGet<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span><\/p>\n

        public<\/span> void<\/span> logResourceUsage<\/span>(<\/span>)<\/span> {<\/span>
        \n MemoryUsage<\/span> heapUsage =<\/span> memoryBean.<\/span>getHeapMemoryUsage<\/span>(<\/span>)<\/span>;<\/span>
        \n logger.<\/span>info<\/span>(<\/span>"\u5f53\u524d\u8fde\u63a5\u6570: {}, \u5806\u5185\u5b58\u4f7f\u7528: {}MB\/{MB"<\/span>,<\/span>
        \n connectionCount.<\/span>get<\/span>(<\/span>)<\/span>,<\/span>
        \n heapUsage.<\/span>getUsed<\/span>(<\/span>)<\/span> \/<\/span> 1024<\/span> \/<\/span> 1024<\/span>,<\/span>
        \n heapUsage.<\/span>getMax<\/span>(<\/span>)<\/span> \/<\/span> 1024<\/span> \/<\/span> 1024<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        5. \u603b\u7ed3<\/h3>\n

        \u901a\u8fc7\u672c\u6587\u7684\u8be6\u7ec6\u5206\u6790\u548c\u5b9e\u73b0，\u6211\u4eec\u6784\u5efa\u4e86\u4e00\u4e2a\u5b8c\u6574\u7684\u9ad8\u6027\u80fdNIO Socket\u670d\u52a1\u5668\u3002\u8fd9\u4e2a\u670d\u52a1\u5668\u5177\u5907\u4ee5\u4e0b\u7279\u70b9：<\/p>\n

      • \u9ad8\u5e76\u53d1\u5904\u7406\u80fd\u529b：\u5355\u7ebf\u7a0b\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5，\u8d44\u6e90\u5229\u7528\u7387\u9ad8<\/li>\n
      • \u53ef\u9760\u7684\u534f\u8bae\u5904\u7406：\u6709\u6548\u89e3\u51b3\u7c98\u5305\u62c6\u5305\u95ee\u9898，\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027<\/li>\n
      • \u5065\u58ee\u7684\u5f02\u5e38\u5904\u7406：\u5206\u7c7b\u5904\u7406\u5404\u79cd\u5f02\u5e38\u60c5\u51b5，\u4fdd\u8bc1\u7cfb\u7edf\u7a33\u5b9a\u6027<\/li>\n
      • \u5b8c\u5584\u7684\u8fde\u63a5\u7ba1\u7406：\u5b9e\u73b0\u8fde\u63a5\u751f\u547d\u5468\u671f\u7ba1\u7406\u548c\u8d44\u6e90\u76d1\u63a7<\/li>\n

        \u5728\u7269\u8054\u7f51\u5e73\u53f0\u7684\u5b9e\u9645\u5e94\u7528\u4e2d，\u8fd9\u79cd\u67b6\u6784\u80fd\u591f\u9ad8\u6548\u5904\u7406\u5927\u91cf\u8bbe\u5907\u8fde\u63a5\u548c\u6570\u636e\u4f20\u8f93，\u4e3a\u6784\u5efa\u53ef\u6269\u5c55\u7684\u7269\u8054\u7f51\u7cfb\u7edf\u63d0\u4f9b\u4e86\u575a\u5b9e\u7684\u6280\u672f\u57fa\u7840\u3002\u901a\u8fc7\u5408\u7406\u7684\u4f18\u5316\u548c\u8c03\u4f18，\u5355\u4e2aNIO\u670d\u52a1\u5668\u5b9e\u4f8b\u53ef\u4ee5\u652f\u6301\u6570\u4e07\u4e2a\u5e76\u53d1\u8fde\u63a5，\u6ee1\u8db3\u5927\u89c4\u6a21\u7269\u8054\u7f51\u5e94\u7528\u7684\u9700\u6c42\u3002<\/p>\n

        \u5728\u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d，\u6211\u4eec\u5c06\u63a2\u8ba8\u5982\u4f55\u5c06\u591a\u4e2aNIO\u670d\u52a1\u5668\u5b9e\u4f8b\u7ec4\u5408\u6210\u96c6\u7fa4，\u5b9e\u73b0\u66f4\u5927\u89c4\u6a21\u7684\u5e76\u53d1\u5904\u7406\u80fd\u529b\u548c\u9ad8\u53ef\u7528\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

        1. \u5355\u7ebf\u7a0bNIO\u670d\u52a1\u5668\u67b6\u6784\u8bbe\u8ba1
        \n1.1 \u67b6\u6784\u8bbe\u8ba1\u539f\u5219
        \n\u5355\u7ebf\u7a0bNIO\u670d\u52a1\u5668\u7684\u6838\u5fc3\u601d\u60f3\u662f\u4f7f\u7528\u4e00\u4e2a\u7ebf\u7a0b\u901a\u8fc7Selector\u76d1\u63a7\u591a\u4e2a\u901a\u9053\u7684I\/O\u4e8b\u4ef6，\u5b9e\u73b0\u9ad8\u5e76\u53d1\u5904\u7406\u3002\u8fd9\u79cd\u67b6\u6784\u5177\u6709\u4ee5\u4e0b\u4f18\u52bf：
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