【Java-II】网络编程实战讲解 P7-12（Day19-20210718-Day2）

菜菜2022

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原创最新推荐文章于 2026-09-03 04:01:53 发布 191 阅读 AI 写同款· GEO 优化 ›

【电力负荷预测】项目介绍 MATLAB实现基于BO-Transformer-LSTM贝叶斯优化算法（BO）优化Transformer-LSTM组合模型进行居民用户多步电力负荷预测（含模型描述及部分示例内容概要：本文介绍了一个基于BO-Transformer-LSTM的组合模型，用于实现居民用户多步电力负荷预测的完整项目实例。该模型融合Transformer的全局注意力机制与LSTM的局部时序记忆能力，构建能够捕捉长时依赖与周期性特征的深度学习架构，并引入贝叶斯优化（BO）自动搜索最优超参数组合，提升预测精度与训练效率。项目涵盖从原始数据清洗、特征工程、滑动窗口样本构建、模型设计到超参数优化、反归一化及多步误差评估的全流程，强调时间顺序划分以防止信息泄露，并通过周期编码、外生变量融合等方式增强数据表达能力。文中提供了详细的MATLAB代码示例，包括数据预处理、网络搭建、贝叶斯优化配置和预测结果评估等关键步骤。适合人群：具备一定机器学习和时间序列分析基础，熟悉MATLAB编程环境，从事电力系统预测、智能电网、负荷管理等相关领域的研究人员、工程师及研究生。使用场景及目标：①应用于居民级或多用户聚合负荷的短期至中期多步预测（如未来24小时）；②服务于配电系统运行调度、需求响应基线设定、家庭能源管理系统优化、分布式能源协调控制等实际工程场景；③为科研提供可复现的深度学习+贝叶斯优化的技术路线参考。阅读建议：此资源以实际项目为导向，建议读者结合提供的代码逐步实现并调试模型，重点关注数据质量控制、时间特征编码、组合网络结构设计与贝叶斯优化稳定性之间的协同关系，在实践中深入理解多步预测中的误差累积机制与超参数敏感性问题。立即下载

1.7 TCP文件上传实现

package web;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class testServerDemo02 {
    public static void main(String[] args) throws IOException {
        //1、创建服务
        ServerSocket serverSocket = new ServerSocket(9000);
        //2、监听客户端的连接
        Socket socket =serverSocket.accept();//阻塞式监听，会一直等待客户端 Scanner scanner = new Scanner(System.in);
        //3、获取输入流
        InputStream is = socket.getInputStream();
        //4、文件输出
        FileOutputStream fos = new FileOutputStream(new File("receive.jpg"));
        byte[] buffer = new byte[1024];
        int len=0;
        while((len=is.read(buffer))!=-1){
            fos.write(buffer,0,len);
        }
        OutputStream os = socket.getOutputStream();
        os.write("我接收完了，你们可以关闭了".getBytes());

        fos.close();
        is.close();
        socket.close();
        serverSocket.close();
    }
}

package web;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class testClientDemo02 {
    public static void main(String[] args) throws IOException {
        //1、创建一个socket连接
        Socket socket=new Socket(InetAddress.getByName("127.0.0.1"),9000);
        //2、创建一个输出流
        OutputStream os = socket.getOutputStream();
        //3、文件流-读取文件
        FileInputStream fis = new FileInputStream(new File("20210705_1.jpg"));
        //4、写出文件
        byte[] buffer = new byte[1024];
        int len;
        while ((len=fis.read(buffer))!=-1){
            os.write(buffer,0,len);
        }
        //通知服务器，我已经结束了
        socket.shutdownOutput();//我已经传输完了

        //确定服务器接收完毕，才能够断开连接
        InputStream inputStream = socket.getInputStream();
        //String byte[]
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer2=new byte[1024];
        int len2 = 0;
        while((len= inputStream.read())!=-1){
            baos.write(buffer2,0,len2);
        }
        System.out.println(baos.toString());
        baos.close();
        inputStream.close();
        fis.close();
        os.close();
        socket.close();
    }
}

1.8 初始Tomcat

在这里插入图片描述存放发布的项目

1.9 UDP消息发送

不用连接，但是需要对方的地址;
【UdpClientDemo01】

package web;
import java.io.IOException;
import java.net.*;

public class UdpClientDemo01 {
    public static void main(String[] args) throws IOException {
        //1、建立一个socket
        DatagramSocket socket = new DatagramSocket();
        //2、建个包
        String msg="你好啊，服务器！";
        //发送给谁
        InetAddress localhost = InetAddress.getByName("localhost");
        int port=9090;
        // 数据 数据的长度 起始 要发送给谁
        DatagramPacket packet = new DatagramPacket(msg.getBytes(), 0, msg.getBytes().length, localhost, port);
        //3、发送包
        socket.send(packet);
        //4、关闭流
        socket.close();
    }
}

【UdpServerDemo01】

package web;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UdpServerDemo01 {
    public static void main(String[] args) throws IOException {
        //1、开放端口
        DatagramSocket socket = new DatagramSocket(9090);
        //接收数据包
        byte[] buffer = new byte[1024];
        DatagramPacket packet = new DatagramPacket(buffer, 0, buffer.length);
        socket.receive(packet);//阻塞接收

        System.out.println(packet.getLength());
        System.out.println(packet.getAddress());
        System.out.println(packet.getAddress().getHostName());
        System.out.println(new String(packet.getData()));
        //关闭连接
        socket.close();
    }
}

1.10 UDP聊天实现

不使用线程，只能实现两个人之间的聊天
【UdpSenderDemo01】

package web.chart;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class UdpSenderDemo01 {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(8888);
        //准备数据：控制台读取 System.in
        while (true){
            BufferedReader reader= new BufferedReader(new InputStreamReader(System.in));
            String data = reader.readLine();
            byte[] datas = data.getBytes();
            DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("localhost",6666));
            socket.send(packet);
            if (data.equals("bye")){
                break;
            }
        }
        socket.close();
    }
}

【UdpReceiveDemo01】

package web.chart;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UdpReceiveDemo01 {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(6666);

        //准备接收包裹
        while (true){
            byte[] container = new byte[1024];
            DatagramPacket packet = new DatagramPacket(container,0,container.length);
            socket.receive(packet);//阻塞式接收包裹
            //断开连接 bye
            byte[] data = packet.getData();
            String receiveData = new String(data, 0, data.length);
            System.out.println(receiveData);
            if (receiveData.equals("bye")){
                break;
            }
        }
        socket.close();
    }
}

使用线程，实现多人之间的聊天

1.11 UDP多线程在线咨询

【TalkSend】

package web.chart;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class TalkSend implements Runnable{
    DatagramSocket socket = null;
    BufferedReader reader = null;
    private int fromPort;
    private String toIP;
    private int toPort;

    public TalkSend(int fromPort, String toIP, int toPort) {
        this.fromPort = fromPort;
        this.toIP = toIP;
        this.toPort = toPort;
        try {
            socket = new DatagramSocket(fromPort);
            reader = new BufferedReader(new InputStreamReader(System.in));
        } catch (SocketException e) {
            e.printStackTrace();
        }

    }

    @Override
    public void run() {
        while (true){
            try {
                String data = reader.readLine();
                byte[] datas = data.getBytes();
                DatagramPacket packet = new DatagramPacket(datas, 0, datas.length, new InetSocketAddress(this.toIP , this.toPort));
                socket.send(packet);
                if (data.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        socket.close();
    }
}

【TalkReceive】

package web.chart;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TalkReceive implements Runnable{
    DatagramSocket socket=null;
    private int port;
    private String msgFrom;
    public TalkReceive(int port,String msgFrom){
        this.port=port;
        this.msgFrom=msgFrom;

        try {
            socket = new DatagramSocket(port);
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true){
            try{
                //准备接收包裹
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container, 0, container.length);
                socket.receive(packet);//阻塞式接收包裹

                //断开连接 bye
                byte[] data = packet.getData();
                String receive = new String(data, 0, data.length);
                System.out.println(msgFrom+" :"+receive);
                if (receive.equals("bye")){
                    break;
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        socket.close();
    }
}

【TestTeacher】

package web.chart;

public class TestTeacher {
    public static void main(String[] args) {
        new Thread(new TalkSend(5555,"localhost",8888)).start();
        new Thread(new TalkReceive(9999,"学生")).start();
    }
}

【TestStudent】

package web.chart;
public class TestStudent {
    public static void main(String[] args) {
        //开启两个线程
        new Thread(new TalkSend(7777,"localhost",9999)).start();
        new Thread(new TalkReceive(8888,"老师")).start();
    }
}

1.18 URL下载网络资源

url统一资源定位符
在这里插入图片描述
下载网络图片

package web;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class URLDown {
    public static void main(String[] args) throws IOException {
        //1、下载地址
        URL url = new URL("https://ww2.sinaimg.cn/bmiddle/6e48db9egy1gsl45vx95vj20hd0b6jsd.jpg");
        //2、连接到这个资源Http
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        InputStream inputStream = urlConnection.getInputStream();
        FileOutputStream fileOutputStream = new FileOutputStream("1.jpg");
        byte[] buffer = new byte[1024];
        int len=0;
        while ((len=inputStream.read(buffer))!=-1){
            fileOutputStream.write(buffer,0,len);
        }
        fileOutputStream.close();
        inputStream.close();
        urlConnection.disconnect();
    }
}