2012-10-20 99 views
10

我需要使客戶端能夠建立多個連接。我使用Netty 4.0。不幸的是,所有現有的示例都沒有顯示如何創建大量連接。Netty 4多個客戶端

public class TelnetClient { 
    private Bootstrap b; 
    public TelnetClient() { 
     b = new Bootstrap(); 
    } 
    public void connect(String host, int port) throws Exception { 
     try { 
      b.group(new NioEventLoopGroup()).channel(NioSocketChannel.class).remoteAddress(host, port).handler(new TelnetClientInitializer()); 
      Channel ch = b.connect().sync().channel(); 
      ChannelFuture lastWriteFuture = null; 
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); 
      for (;;) { 
       String line = in.readLine(); 
       if (line == null) break; 
       lastWriteFuture = ch.write(line + "\r\n"); 
       if (line.toLowerCase().equals("bye")) { 
        ch.closeFuture().sync(); 
        break; 
       } 
      } 
      if (lastWriteFuture != null) lastWriteFuture.sync(); 
     } finally { 
      b.shutdown(); 
     } 
    } 
    public static void main(String[] args) throws Exception { 
     TelnetClient tc = new TelnetClient(); 
     tc.connect("127.0.0.1", 1048); 
     tc.connect("192.168.1.123", 1050); 
    //... 
    } 
} 

這是正確的決定嗎?或者它可能會更好?

回答

9

是的,它幾乎是正確的。唯一必須改變的是在每個連接上創建NioEventLoopGroup。

NioEventLoopGroup實例很貴,所以應該共享。創建一個實例並共享它,通過將相同的實例每次傳遞給Bootstrap.group(...)。

+0

和TelnetClientInitializer()怎麼樣,也足以創建一個實例? – user1221483

+0

取決於代碼..它是@Sharable或不);)? –

+0

是的,它是可共享的 – user1221483