netty基础教程-4、helloworld（优化版）_netty 4，2024年最新2024最新Golang面试题目

    System.out.println("服务端停止服务！！！");
}

}

1）、在这里将业逻辑注入，这样就很好的将业务和IO操作分离开了


**通道初始化类：ServerChannelInit.java**

public class ServerChannelInit extends ChannelInitializer { @Override protected void initChannel(NioSocketChannel ch) throws Exception { //对服务端管道进行配置，编解码，Handler的处理顺序等等 ch.pipeline() .addLast(new StringEncoder()) .addLast(new StringDecoder()) .addLast(new ServerHandler()); } }

**通道数据处理类：ServerHandler.java**

public class ServerHandler extends SimpleChannelInboundHandler {

@Override
public void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        System.out.println("接受到数据是："+msg);
        //返回响应
        ctx.writeAndFlush("服务端已经接受数据！！");
}

@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
    System.out.println("=============test通道激活============");
    super.channelActive(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
    System.out.println("=============test通道激活ing============");
    super.channelInactive(ctx);
}

@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
    System.out.println("=============test通道数据读取完毕！！============");
    super.channelReadComplete(ctx);
}

@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    System.out.println("=============test通道激活出现异常============");
    super.exceptionCaught(ctx, cause);
    ctx.close();
}

}

### 客户端实现


**启动类：Client.java**

public class Client { public static void main(String[] args) throws Exception{ NioEventLoopGroup workGroup = new NioEventLoopGroup(); Bootstrap b = new Bootstrap(); ChannelFuture cf = b.group(workGroup) .channel(NioSocketChannel.class) .handler(new ClientChannelInit()) .connect("127.0.0.1", 8899) .sync(); server",CharsetUtil.UTF_8)); System.out.println("客户端初始化完成!!!!"); cf.channel().closeFuture().sync(); } }

**通道初始化类：ClientChannelInit.java**

public class ClientChannelInit extends ChannelInitializer { @Override protected void initChannel(NioSocketChannel ch) throws Exception { ch.pipeline() .addLast(new StringEncoder()) .addLast(new StringDecoder()) .addLast(new ClientHandler()); } }

**通道数据处理类：ClientHandler.java**

public class ClientHandler extends SimpleChannelInboundHandler { @Override public void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception { System.out.println("接受到服务端的消息："+msg); }

/\*\*

* 在channel初始化的时候，发送数据 * @param ctx * @throws Exception */ @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { ctx.writeAndFlush("hello server"); } }

### 总结




![img](https://p9-xtjj-sign.byteimg.com/tos-cn-i-73owjymdk6/4afa35f6187a463d9097c6222c7d2eba~tplv-73owjymdk6-jj-mark-v1:0:0:0:0:5o6Y6YeR5oqA5pyv56S-5Yy6IEAg5py65Zmo5a2m5Lmg5LmL5b-DQUk=:q75.awebp?rk3s=f64ab15b&x-expires=1772462131&x-signature=utX%2F9Zsk03Ak7dLmLO2XqAFdQcI%3D)
![img](https://p9-xtjj-sign.byteimg.com/tos-cn-i-73owjymdk6/4c31517019a34802833512202f331407~tplv-73owjymdk6-jj-mark-v1:0:0:0:0:5o6Y6YeR5oqA5pyv56S-5Yy6IEAg5py65Zmo5a2m5Lmg5LmL5b-DQUk=:q75.awebp?rk3s=f64ab15b&x-expires=1772462131&x-signature=SaMZeOJlihmnDFKDcAAmZuTTcWs%3D)

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