netty 案例，netty4.1 中级拓展篇十一《Netty 基于 ChunkedStream 数据流切块传输》

itstack-demo-netty-2-11
└── src
    ├── main
    │   └── java
    │       └── org.itstack.demo.netty.server
    │           ├── MyChannelInitializer.java
    │           ├── MyServerChunkHandler.java
    │           ├── MyServerHandler.java
    │           └── NettyServer.java
    └── test
         └── java
             └── org.itstack.demo.test
                 └── ApiTest.java

/**
 * 虫洞栈：https://bugstack.cn
 * 公众号：bugstack虫洞栈  ｛获取学习源码｝
 * Create by fuzhengwei on 2019
 */
public class MyChannelInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel channel) {
        // 基于换行符号
        channel.pipeline().addLast(new LineBasedFrameDecoder(1024));
        // 流量分块
        channel.pipeline().addLast(new ChunkedWriteHandler());
        channel.pipeline().addLast(new MyServerChunkHandler());
        // 解码转String，注意调整自己的编码格式GBK、UTF-8
        channel.pipeline().addLast(new StringDecoder(Charset.forName("GBK")));
        // 解码转String，注意调整自己的编码格式GBK、UTF-8
        channel.pipeline().addLast(new StringEncoder(Charset.forName("GBK")));
        // 在管道中添加我们自己的接收数据实现方法
        channel.pipeline().addLast(new MyServerHandler());
    }
}

/**
 * 虫洞栈：https://bugstack.cn
 * 公众号：bugstack虫洞栈 | 欢迎关注并获取专题&源码
 * Create by fuzhengwei on 2019
 */
public class MyServerChunkHandler extends ChannelOutboundHandlerAdapter {
    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        //内容验证
        if (!(msg instanceof ByteBuf)) {
            super.write(ctx, msg, promise);
            return;
        }
        //获取Byte
        ByteBuf buf = (ByteBuf) msg;
        byte[] data = this.getData(buf);
        //写入流中
        ByteInputStream in = new ByteInputStream();
        in.setBuf(data);
        //消息分块；10个字节，测试过程中可以调整
        ChunkedStream stream = new ChunkedStream(in, 10);
        //管道消息传输承诺
        ChannelProgressivePromise progressivePromise = ctx.channel().newProgressivePromise();
        progressivePromise.addListener(new ChannelProgressiveFutureListener() {
            @Override
            public void operationProgressed(ChannelProgressiveFuture future, long progress, long total) throws Exception {
            }
            @Override
            public void operationComplete(ChannelProgressiveFuture future) throws Exception {
                if (future.isSuccess()) {
                    System.out.println("消息发送成功 success");
                    promise.setSuccess();
                } else {
                    System.out.println("消息发送失败 failure：" + future.cause());
                    promise.setFailure(future.cause());
                }
            }
        });
        ReferenceCountUtil.release(msg);
        ctx.write(stream, progressivePromise);
    }
    //获取Byte
    private byte[] getData(ByteBuf buf) {
        if (buf.hasArray()) {
            return buf.array().clone();
        }
        byte[] data = new byte[buf.readableBytes() - 1];
        buf.readBytes(data);
        return data;
    }
}

itstack-demo-netty server start done. {关注公众号：bugstack虫洞栈，获取源码}
链接报告开始
链接报告信息：有一客户端链接到本服务端
链接报告IP:127.0.0.1
链接报告Port:7397
链接报告完毕
消息发送成功 success
2019-09-15 16:36:04 接收到消息：hi 微信公众号：bugstack虫洞栈 | 欢迎关注并获取专题文章和源码
消息发送成功 success
2019-09-15 16:36:04 接收到消息：
消息发送成功 success
Process finished with exit code -1

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