Context提供createAsynchronousChannelGroup方法

src/org/redkale/net/Context.java

@@ -5,8 +5,10 @@
  */
 package org.redkale.net;
 
+import java.io.IOException;
 import java.net.*;
 import java.nio.*;
+import java.nio.channels.AsynchronousChannelGroup;
 import java.nio.charset.*;
 import java.util.concurrent.*;
 import java.util.function.*;
@@ -107,6 +109,10 @@ public class Context {
         return executor.submit(r);
     }
 
+    public AsynchronousChannelGroup createAsynchronousChannelGroup() throws IOException {
+        return AsynchronousChannelGroup.withThreadPool(executor);
+    }
+
     public void runAsync(Runnable r) {
         executor.execute(r);
     }