网络编程-UDP

代码部分--UDP传输

* 1.发送Send

       * 创建DatagramSocket, 随机端口号

       * 创建DatagramPacket, 指定数据, 长度, 地址, 端口

       * 使用DatagramSocket发送DatagramPacket

       * 关闭DatagramSocket

package demo1;

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

public class Test_send {
    /** 1.发送Send
    * 创建DatagramSocket, 随机端口号
    * 创建DatagramPacket, 指定数据, 长度, 地址, 端口
    * 使用DatagramSocket发送DatagramPacket
    * 关闭DatagramSocket
     * @throws SocketException */
public static void main(String[] args) throws Exception {
    //定义要传输的字符串
    String str="hahhah";
    //创建socket
    DatagramSocket socket=new DatagramSocket();
    //创建packet()
    DatagramPacket packet =new DatagramPacket(str.getBytes(),
            str.getBytes().length,InetAddress.getByName("127.0.0.1"),6666);
    //发送数据
    socket.send(packet);
    //关闭socket
    socket.close();
    
}
}

* 2.接收Receive

       * 创建DatagramSocket, 指定端口号

       * 创建DatagramPacket, 指定数组, 长度

       * 使用DatagramSocket接收DatagramPacket

       * 关闭DatagramSocket

       * 从DatagramPacket中获取数据

package demo1;

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

public class Test_receiver {
    /** 创建DatagramSocket, 指定端口号
    * 创建DatagramPacket, 指定数组, 长度
    * 使用DatagramSocket接收DatagramPacket
    * 关闭DatagramSocket
    * 从DatagramPacket中获取数据
     * @throws Exception */

public static void main(String[] args) throws Exception {
    //创建socket相当有码头
    DatagramSocket socket=new DatagramSocket(6666);
    //创建packet相当于集装箱
    DatagramPacket packet=new DatagramPacket(new byte[1024],1024);
    //获取数据
    socket.receive(packet);
    //关闭socket
    socket.close();
    //从packet中取出数据
    byte[] data=packet.getData();
    System.out.println(new String(data,0,packet.getLength()));
    
    
}
}

UDP传输优化（不断的发送，接收）

package demo1;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.Scanner;

public class Test_send {
    /**
     * 1.发送Send 创建DatagramSocket, 随机端口号 创建DatagramPacket, 指定数据, 长度, 地址, 端口
     * 使用DatagramSocket发送DatagramPacket 关闭DatagramSocket
     * 
     * @throws SocketException
     */
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        // 创建socket
        DatagramSocket socket = new DatagramSocket();
        while (true) {
            String line = in.nextLine();
            if ("quit".equals(line)) {
                break;
            } else {
                // 创建packet()
                DatagramPacket packet = new DatagramPacket(line.getBytes(),
                        line.getBytes().length,
                        InetAddress.getByName("127.0.0.1"), 6666);
                // 发送数据
                socket.send(packet);
            }
        }
        // 关闭socket
        socket.close();

    }
}
package demo1;

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

public class Test_receiver {
    /** 创建DatagramSocket, 指定端口号
    * 创建DatagramPacket, 指定数组, 长度
    * 使用DatagramSocket接收DatagramPacket
    * 关闭DatagramSocket
    * 从DatagramPacket中获取数据
     * @throws Exception */

public static void main(String[] args) throws Exception {
    //创建socket相当有码头
    DatagramSocket socket=new DatagramSocket(6666);
    //创建packet相当于集装箱
    DatagramPacket packet=new DatagramPacket(new byte[1024],1024);
    while(true)
    {
        //获取数据
        socket.receive(packet);
        //从packet中取出数据
        byte[] data=packet.getData();
        //获取ip
        String ip=packet.getAddress().getHostAddress();
        System.out.println("ip:"+ip+"  :"+new String(data,0,packet.getLength()));
    }
    
    
    
}
}

 

* 3.接收方获取ip和端口号 

       * String ip = packet.getAddress().getHostAddress();

       * int port = packet.getPort();

UDP传输优化（多线程）

 

package demo1;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.Scanner;

public class Test_send {
    /**
     * 1.发送Send 创建DatagramSocket, 随机端口号 创建DatagramPacket, 指定数据, 长度, 地址, 端口
     * 使用DatagramSocket发送DatagramPacket 关闭DatagramSocket
     * 
     * @throws SocketException
     */
    public static void main(String[] args) throws Exception {
        new Receive().start();
        new Send().start();
    }
}

class Send extends Thread
{
    public void run()
    {
        try {
        Scanner in = new Scanner(System.in);
        // 创建socket
        DatagramSocket socket;
        
            socket = new DatagramSocket();
        
        while (true) {
            String line = in.nextLine();
            if ("quit".equals(line)) {
                break;
            } else {
                // 创建packet()
                DatagramPacket packet = new DatagramPacket(line.getBytes(),
                        line.getBytes().length,
                        InetAddress.getByName("127.0.0.1"), 9999);
                // 发送数据
                socket.send(packet);
            }
        }
        // 关闭socket
        socket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class Receive extends Thread
{
    public void run()
    {
        
        try {
            //创建socket相当有码头
            DatagramSocket socket=new DatagramSocket(9999);
            //创建packet相当于集装箱
            DatagramPacket packet=new DatagramPacket(new byte[1024],1024);
            while(true)
            {
                //获取数据
                socket.receive(packet);
                //从packet中取出数据
                byte[] data=packet.getData();
                //获取ip
                String ip=packet.getAddress().getHostAddress();
                System.out.println("ip:"+ip+"  :"+new String(data,0,packet.getLength()));
            }
        }catch (IOException e) {
            e.printStackTrace();
        }
    }
}

UDP优化-GUI界面聊天（显示+关闭+发送）

 界面

代码实现

package demo2;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class GUIDemo extends Frame {
    TextField ip;
    Button send;
    Button log;
    Button clear;
    Button shake;
    TextArea show;
    TextArea edit;
    DatagramSocket socket;

    /**
     * 窗体的初始化
     */
    public GUIDemo() {
        // 基本控件的初始化
        init();
        try {
            socket = new DatagramSocket();
        } catch (SocketException e) {
            e.printStackTrace();
        }
        // 南边panel的初始化
        sourceMade();
        // 中间panel的初始化
        centerMade();
        // 事件添加
        event();
    }

    /**
     * 中间panel构建
     */
    public void centerMade() {
        Panel center = new Panel();
        center.setLayout(new BorderLayout());
        show = new TextArea();
        show.setEditable(false);
        show.setFont(new Font("xxx", Font.PLAIN, 15));
        edit = new TextArea();
        edit.setFont(new Font("xxx", Font.PLAIN, 15));
        center.add(show, BorderLayout.CENTER);
        center.add(edit, BorderLayout.SOUTH);
        this.add(center, BorderLayout.CENTER);

    }

    /**
     * 南边窗体初始化
     */
    public void sourceMade() {
        Panel source = new Panel();
        ip = new TextField(15);
        ip.setText("127.0.0.1");
        send = new Button("发送");
        log = new Button("记录");
        clear = new Button("清屏");
        shake = new Button("震动");
        source.add(ip);
        source.add(send);
        source.add(log);
        source.add(clear);
        source.add(shake);
        this.add(source, BorderLayout.SOUTH);
    }

    public void init() {
        this.setLocation(500, 500);
        this.setSize(400, 600);
        new Receive().start();
        this.setVisible(true);
    }

    public void event() {
        // 关闭窗体事件
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                socket.close();
                System.exit(0);
            }
        });

        // 发送事件
        send.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    send();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }

        });

        // 记录事件

        // 清屏事件

        // 震动事件

    }

    public void send() throws IOException {

        String message = edit.getText();
        String host = ip.getText();
        DatagramPacket packet = new DatagramPacket(message.getBytes(),
                message.getBytes().length, InetAddress.getByName(host), 9999);
        socket.send(packet);

        String time = getCurrentTime();
        show.append(time + "我对" + host + "说：
" + message + "

");
        edit.setText("");
    }

    private String getCurrentTime() {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
        return sdf.format(date);
    }

    public static void main(String[] args) {
        GUIDemo demo = new GUIDemo();
    }

    private class Receive extends Thread {
        public void run() {
            try {
                DatagramSocket socket = new DatagramSocket(9999);
                DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);
                while (true) {
                    socket.receive(packet);
                    String message = new String(packet.getData(), 0,
                            packet.getLength());
                    String time = getCurrentTime();
                    String ipstr = packet.getAddress().getHostAddress();
                    show.append(time + " " + ipstr + " 对我说：
" + message
                            + "

");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }

}

 

UDP优化-GUI界面聊天（记录+清屏+震动）

清屏

        clear.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                show.setText("");
            }

        });

记录

// 记录事件
        log.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    logFile();
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            }

        });
public void logFile() throws Exception {
        bw.flush();
        //获取输入流
        FileInputStream fis=new FileInputStream("src/log.txt");
        //创建缓冲区
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        int len;
        byte arr[]=new byte[8192];
        while((len=fis.read(arr))!=-1)
        {
            baos.write(arr,0,len);
        }
        String str=baos.toString();
        show.setText(str);
        
        
    }

震动

        // 震动事件
        shake.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    send(new byte[]{-1},ip.getText());
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            }
        });
    public void shake() {
        int x=getLocation().x;
        int y=getLocation().y;
        for(int i=0;i<3;i++)
        {
            try {
                this.setLocation(x+10,y+10);
                Thread.sleep(20);
                this.setLocation(x+10,y-10);
                Thread.sleep(20);
                this.setLocation(x-10,y+10);
                Thread.sleep(20);
                this.setLocation(x-10,y-10);
                Thread.sleep(20);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.setLocation(x,y);
    }

UDP优化-GUI界面聊天（快捷键）

//快捷键发送
        edit.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                //CTRL+回车====》发送信息
                if(e.getKeyChar()==KeyEvent.VK_ENTER && e.isControlDown())
                {
                    try {
                        send();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            }
            
        });

UDP优化-GUI界面聊天（代码优化）

    
    public void send() throws IOException {

        String message = edit.getText();
        String host = ip.getText();
        host=((host.trim().length()==0)?"255.255.255.255":host);
        DatagramPacket packet = new DatagramPacket(message.getBytes(),
                message.getBytes().length, InetAddress.getByName(host), 9999);
        socket.send(packet);

        String time = getCurrentTime();
        host=(("255.255.255.255").equals(host)?"所有人":host);
        String str = time + "我对" + host + "说：
" + message + "

";
        show.append(str);
        bw.append(str);
        edit.setText("");
    }

完整代码

package demo2;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.text.SimpleDateFormat;
import java.util.Date;


public class GUIDemo extends Frame {
    TextField ip;
    Button send;
    Button log;
    Button clear;
    Button shake;
    TextArea show;
    TextArea edit;
    DatagramSocket socket;
    BufferedWriter bw;

    /**
     * 窗体的初始化
     */
    public GUIDemo() {
        // 基本控件的初始化
        init();
        try {
            socket = new DatagramSocket();
            bw=new BufferedWriter(new FileWriter("src/log.txt",true));
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 南边panel的初始化
        sourceMade();
        // 中间panel的初始化
        centerMade();
        // 事件添加
        event();
    }

    /**
     * 中间panel构建
     */
    public void centerMade() {
        Panel center = new Panel();
        center.setLayout(new BorderLayout());
        show = new TextArea();
        show.setEditable(false);
        show.setFont(new Font("xxx", Font.PLAIN, 15));
        edit = new TextArea();
        edit.setFont(new Font("xxx", Font.PLAIN, 15));
        center.add(show, BorderLayout.CENTER);
        center.add(edit, BorderLayout.SOUTH);
        this.add(center, BorderLayout.CENTER);

    }

    /**
     * 南边窗体初始化
     */
    public void sourceMade() {
        Panel source = new Panel();
        ip = new TextField(15);
        ip.setText("192.168.28.1");
        send = new Button("发送");
        log = new Button("记录");
        clear = new Button("清屏");
        shake = new Button("震动");
        source.add(ip);
        source.add(send);
        source.add(log);
        source.add(clear);
        source.add(shake);
        this.add(source, BorderLayout.SOUTH);
    }

    public void init() {
        this.setLocation(500, 500);
        this.setSize(400, 600);
        new Receive().start();
        this.setVisible(true);
    }

    public void event() {
        // 关闭窗体事件
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                socket.close();
                System.exit(0);
            }
        });

        // 发送事件
        send.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    send();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }

        });

        // 记录事件
        log.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    logFile();
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            }

        });
        
        
        // 清屏事件
        clear.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                show.setText("");
            }

        });
        
        // 震动事件
        shake.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    send(new byte[]{-1},ip.getText());
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            }
        });
        //快捷键发送
        edit.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                //CTRL+回车====》发送信息
                if(e.getKeyChar()==KeyEvent.VK_ENTER && e.isControlDown())
                {
                    try {
                        send();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            }
            
        });
    }

    public void logFile() throws Exception {
        bw.flush();
        //获取输入流
        FileInputStream fis=new FileInputStream("src/log.txt");
        //创建缓冲区
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        int len;
        byte arr[]=new byte[8192];
        while((len=fis.read(arr))!=-1)
        {
            baos.write(arr,0,len);
        }
        String str=baos.toString();
        show.setText(str);
        
        
    }
    
    public void shake() {
        int x=getLocation().x;
        int y=getLocation().y;
        for(int i=0;i<3;i++)
        {
            try {
                this.setLocation(x+10,y+10);
                Thread.sleep(20);
                this.setLocation(x+10,y-10);
                Thread.sleep(20);
                this.setLocation(x-10,y+10);
                Thread.sleep(20);
                this.setLocation(x-10,y-10);
                Thread.sleep(20);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.setLocation(x,y);
    }
    
    public void send(byte[] arr,String ip) throws IOException {
        DatagramPacket packet = new DatagramPacket(arr,
                arr.length, InetAddress.getByName(ip), 9999);
        socket.send(packet);
        
    }
    
    public void send() throws IOException {

        String message = edit.getText();
        String host = ip.getText();
        host=((host.trim().length()==0)?"255.255.255.255":host);
        DatagramPacket packet = new DatagramPacket(message.getBytes(),
                message.getBytes().length, InetAddress.getByName(host), 9999);
        socket.send(packet);

        String time = getCurrentTime();
        host=(("255.255.255.255").equals(host)?"所有人":host);
        String str = time + "我对" + host + "说：
" + message + "

";
        show.append(str);
        bw.append(str);
        edit.setText("");
    }
    
    private String getCurrentTime() {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
        return sdf.format(date);
    }

    public static void main(String[] args) {
        GUIDemo demo = new GUIDemo();
    }

    private class Receive extends Thread {
        public void run() {
            try {
                DatagramSocket socket = new DatagramSocket(9999);
                DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);
                while (true) {
                    socket.receive(packet);
                    String message = new String(packet.getData(), 0,
                            packet.getLength());
                    if(packet.getData()[0]==-1&&packet.getLength()==1)
                    {
                        shake();
                        continue;
                    }
                    
                    String time = getCurrentTime();
                    String ipstr = packet.getAddress().getHostAddress();
                    String str = time + " " + ipstr + " 对我说：
" + message
                            + "

";
                    show.append(str);
                    bw.append(str);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }

}

最终界面

封装双击可运行jar包

（1）选中涉及到的java文件

（2）右击，导出

（3）JavFile

（4）next（选择保存路径）

（5）next--next--（选取main所在类）

（6）finash

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原文地址：https://www.cnblogs.com/excellencesy/p/9175061.html