代码优化，避免新增端口映射时不断创建新的ServerBootstrap实例.

neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/base/proxy/ProxyConfiguration.java

@@ -1,6 +1,9 @@
 package org.dromara.neutrinoproxy.server.base.proxy;
 
 import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.socket.SocketChannel;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
 import org.dromara.neutrinoproxy.core.ProxyDataTypeEnum;
 import org.dromara.neutrinoproxy.core.ProxyMessage;
 import org.dromara.neutrinoproxy.core.ProxyMessageHandler;
@@ -8,6 +11,8 @@ import org.dromara.neutrinoproxy.core.dispatcher.DefaultDispatcher;
 import org.dromara.neutrinoproxy.core.dispatcher.Dispatcher;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.nio.NioEventLoopGroup;
+import org.dromara.neutrinoproxy.server.proxy.core.BytesMetricsHandler;
+import org.dromara.neutrinoproxy.server.proxy.core.TcpVisitorChannelHandler;
 import org.noear.solon.Solon;
 import org.noear.solon.annotation.Bean;
 import org.noear.solon.annotation.Configuration;
@@ -48,7 +53,15 @@ public class ProxyConfiguration implements LifecycleBean {
     public ServerBootstrap tcpServerBootstrap(@Inject("serverBossGroup") NioEventLoopGroup serverBossGroup,
                                               @Inject("serverWorkerGroup") NioEventLoopGroup serverWorkerGroup) {
         ServerBootstrap bootstrap = new ServerBootstrap();
-        bootstrap.group(serverBossGroup, serverWorkerGroup);
+        bootstrap.group(serverBossGroup, serverWorkerGroup)
+                .channel(NioServerSocketChannel.class)
+                .childHandler(new ChannelInitializer<SocketChannel>() {
+            @Override
+            public void initChannel(SocketChannel ch) throws Exception {
+                ch.pipeline().addFirst(new BytesMetricsHandler());
+                ch.pipeline().addLast(new TcpVisitorChannelHandler());
+            }
+        });
         return bootstrap;
     }
 

neutrino-proxy-server/src/main/java/org/dromara/neutrinoproxy/server/service/VisitorChannelService.java

@@ -216,13 +216,6 @@ public class VisitorChannelService {
         if (CollectionUtil.isEmpty(portMappingList)) {
             return;
         }
-        tcpServerBootstrap.channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() {
-                    @Override
-                    public void initChannel(SocketChannel ch) throws Exception {
-                ch.pipeline().addFirst(new BytesMetricsHandler());
-                ch.pipeline().addLast(new TcpVisitorChannelHandler());
-            }
-        });
 
         for (PortMappingDO portMapping : portMappingList) {
             try {