新手请教怎么用netty方便地发送消息？

zhangzh_H39kg · 4 年前

看书和网上的例子都是写一个类继承

ChannelInboundHandlerAdapter，在channelActive 方法理用 ChannelHandlerContext.writeAndFlush 发送消息，然后就没了。那怎么可以像@Autowired那样或者调用静态方法一样去发消息呢，没找到什么方法，试了图中方式一，把ctx赋给全局变量，然后把这个handler注册为一个bean然后@Autowired进来调用write方法，结果服务端收不到消息，试了把ctx存在一个类里，调用send方法再拿出来也是服务端收不到，请问要怎么办

public class ZLCNettyClientHandler extends ChannelInboundHandlerAdapter {

      private ChannelHandlerContext ctx;

      public void write(final ZPE zpe) {
            // 1
            this.ctx.writeAndFlush(Unpooled.copiedBuffer(ZPU.wanzhangbytearray(ZPU.serialize(zpe))));

            // 2
            CTXC.get().writeAndFlush(Unpooled.copiedBuffer(ZPU.wanzhangbytearray(ZPU.serialize(zpe))));
            System.out.println("s.ctx.hid = " + System.identityHashCode(CTXC.get()));
      }

      @Override
      public void channelActive(final ChannelHandlerContext ctx) throws Exception {
            // 1
            this.ctx = ctx;

            // 2
            CTXC.set(ctx);

            System.out.println("channelActive.ctx.hid = " + System.identityHashCode(ctx));
            System.out.println(Thread.currentThread().getName() + "\t" + LocalDateTime.now() + "\t"
                              + "ZLCNettyClientH.channelActive()");
            System.out.println();

            final ZPE zpe = zpe("A1", ZPEOperationTypeEnum.STRING, ZPEOperationSTypeEnum.LENGTH);
            final byte[] wan = ZPU.wanzhangbytearray(ZPU.serialize(zpe));
            System.out.println("ZLCNettyClientH.wan = " + Arrays.toString(wan));
            ctx.writeAndFlush(Unpooled.copiedBuffer(wan));
            System.out.println("ZLCNettyClientH.ctx.writeAndFlush(Unpooled.copiedBuffer(wan));");

      }