业务简单科普
互联网，物联网
| 互联网 | 物联网 | |
|---|---|---|
| 定义 | 连接计算机和移动设备等人类使用的设备 | 连接任何物品、设备和传感器等物理实体的网络 |
| 应用场景 | 电子商务、社交媒体、在线视频、云计算等 | 智能家居，智慧城市，智慧 |
| 网络架构 | 中心服务器为核心 | 边缘计算 |
什么是边缘计算？
监控
能看多远？
清晰度？
4 分钟
视频平台概览
回到什么是边缘计算？
门禁
消费
技术架构
简单架构图
协议
- RTMP/RTSP：传统流媒体协议
- HTTP/HTTPS
- 自定义协议
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package org.example;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
public final class Client {
static final String HOST = System.getProperty("host", "127.0.0.1");
static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
public static void main(String[] args) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline p = ch.pipeline();
p.addLast(new ClientHandler());
}
});
ChannelFuture f = b.connect(HOST, PORT).sync();
f.channel().closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
}
package org.example;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
public class ClientHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelActive(ChannelHandlerContext ctx) {
ByteBuf buffer = Unpooled.buffer();
buffer.writeShort(0b0000000000001101); // 2 字节
buffer.writeByte(0b11111000); // 1 字节
buffer.writeShort(0b0110110001101001); // 2 字节
buffer.writeInt(0b00110001001100100011001100110100); // 4 字节
buffer.writeInt(0b00110101001101100011011100111000); // 4 字节
buffer.writeShort(0b1000001001000000); // 2 字节
ctx.writeAndFlush(buffer);
ctx.writeAndFlush(buffer);
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ctx.write(msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
// Close the connection when an exception is raised.
cause.printStackTrace();
ctx.close();
}
}
package org.example;
import lombok.Data;
@Data
public class CustomPort {
// length 0
private String field1;
// bitmap 1
private String field2;
// name 2
private String field3;
// cardNum 3
private String field4;
// price 4
private Integer field5;
// datetime 5
private String field6;
// ....
private String field7;
private String field8;
}
package org.example;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import java.util.Arrays;
import java.util.List;
public class CustomServerHandler extends ByteToMessageDecoder {
@Override
protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) throws Exception {
byte[] all = new byte[byteBuf.readableBytes()];
byteBuf.readBytes(all);
System.out.println(Arrays.toString(all));
// byte[] length = new byte[2];
// byteBuf.readBytes(length);
// System.out.println(Arrays.toString(length));
// System.out.println("---------------------");
// byte[] bytes = new byte[byteBuf.readableBytes()];
// byteBuf.readBytes(bytes);
// System.out.println(Arrays.toString(bytes));
}
}
package org.example;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
public class Server {
public static void main(String[] args) {
// Configure the server.
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 100)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline p = ch.pipeline();
//p.addLast(new LoggingHandler(LogLevel.INFO));
p.addLast(new CustomServerHandler());
}
});
// Start the server.
ChannelFuture f = b.bind(8080).sync();
// Wait until the server socket is closed.
f.channel().closeFuture().sync();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
// Shut down all event loops to terminate all threads.
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
