网络编程应用：基于UDP协议【实现聊天程序】--练习

迷南。 2022-06-16 04:07 225阅读 0赞

要求：

使用UDP协议实现一个聊天程序

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**代码：**

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**发送端：**

package UDP聊天程序;
    
    import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;
    import java.net.SocketException;
    import java.net.UnknownHostException;
    import java.util.Scanner;
    
    public class Send {
        public static void main(String[] args) {
            System.out.println("发送端已启动！");
    
            DatagramSocket socket=null;
            Scanner scanner=new Scanner(System.in);
            try {
                //1.创建Datagramsocket对象
                socket=new DatagramSocket();
    
                while(true){
                    //2.要发送的数据
                    String string=scanner.nextLine();
    
                    //3.创建数据包
                    DatagramPacket packet=new DatagramPacket(string.getBytes(), string.getBytes().length,InetAddress.getLocalHost(),6666);
                    //4.发送数据
                    socket.send(packet);
                    //若我方发送了bye，马上结束聊天
                    if(string.equals("bye")){
                        System.out.println("bye,聊天结束！");
                        break;
                    }
    
                    //5.接收--接收端回复的数据
                    byte[] bs=new byte[1024];
                    DatagramPacket packet2=new DatagramPacket(bs, bs.length);
                    socket.receive(packet2);
                    String string2=new String(packet2.getData(), 0, packet2.getLength());
                    //若对方发送了bye，马上结束聊天
                    if(string2.equals("bye")){
                        System.out.println("bye,聊天结束！");
                        break;
                    }
                    System.out.println("接收端回复："+string2);
                }
    
    
            } catch (SocketException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally {
                if(socket!=null){
                    socket.close();
                }
            }
    
        }
    }

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**接收端：**

package UDP聊天程序;
    
    import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.SocketException;
    import java.util.Scanner;
    
    public class Receive {
        public static void main(String[] args) {
            System.out.println("接收端已启动！");
    
            DatagramSocket socket=null;
            Scanner scanner=new Scanner(System.in);
            try {
                //1.创建Datagrams对象
                socket=new DatagramSocket(6666);
    
                while(true){
                    //2.创建数据包packet
                    byte[] buf=new byte[1024];
                    DatagramPacket packet=new DatagramPacket(buf, buf.length);
                    //3.接收数据
                    socket.receive(packet);
                    String string=new String(packet.getData(), 0, packet.getLength());
                    //若对方发送了bye，马上结束聊天
                    if(string.equals("bye")){
                        System.out.println("bye,聊天结束！");
                        break;
                    }
                    System.out.println("发送端说："+string);
    
                    //4.给发送端回复
                    String string2=scanner.nextLine();
                    DatagramPacket packet2=new DatagramPacket(string2.getBytes(), string2.getBytes().length,packet.getAddress(),packet.getPort());
                    socket.send(packet2);
                    //若我方发送了bye，马上结束聊天
                    if(string2.equals("bye")){
                        System.out.println("bye,聊天结束！");
                        break;
                    }
                }
            } catch (SocketException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally {
                if(socket!=null){
                    socket.close();
                }
            }
    
        }
    }

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**运行结果：**

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**接收端聊天列表：**

![这里写图片描述][SouthEast]

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**发送端聊天列表：**

![这里写图片描述][SouthEast 1]

[SouthEast]: /images/20220616/170dd4c9583649baa192df497d0537c0.png
[SouthEast 1]: /images/20220616/1df14fd4cea44187986792285da48eea.png