JAVA基於UDP的聊天程序

服務器端

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

public class UDPServer {

    public static void main(String[] args) {
        UDPServer frm=new UDPServer();

    }
    String strbuf=" ";
    SerThread st;
    public  UDPServer(){
        st=new SerThread();
        st.start();
    }

}


class SerThread extends Thread{
    public SerThread(){

    }
    public void run(){
        String str1;
        try {
            DatagramSocket skt=new DatagramSocket(8080);
            System.out.println("服務器名：");
            //顯示服務器名稱
            System.out.println(InetAddress.getLocalHost().getHostName());
            while (true){
                byte[] inBuf =new byte[256];
                //下面是取得服務器地址
                DatagramPacket pkt;
                //創建並設置接收pkt對象的接收信息
                pkt=new DatagramPacket(inBuf,inBuf.length);
                skt.receive(pkt);
                //提取接收到的分組中的數據轉換為字符串
                str1=new String(pkt.getData());
                str1=str1.trim();         //    去掉字符串首尾空格

                if(str1.length()>0){
                    int pot=pkt.getPort();
                    System.out.println("遠端端口"+pot);
                    System.out.println("服務器已接收到消息"+str1);

                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

客戶端

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

public class UDPClient {

    public static void main(String[] args) {
        UDPClient frm=new UDPClient();
    }

    CliThread ct;
    public UDPClient()
    {
        ct=new CliThread();
        ct.start();
    }
}


class CliThread extends  Thread{
    public CliThread(){

    }

    public  void run(){
        String str1;
        String serverName="appledeMBP";          //服務器機器名
        System.out.println("請發送消息給服務器《"+serverName+"》");
        try {
            DatagramSocket skt=new DatagramSocket();
            DatagramPacket pkt;
            while (true){
                BufferedReader buf;
                buf=new BufferedReader(new InputStreamReader(System.in));
                System.out.println("請輸入信息：");
                str1=buf.readLine();
                byte[] outBuf=new byte[str1.length()];
                outBuf=str1.getBytes();
                //獲取服務器端地址
                InetAddress address=InetAddress.getByName(serverName);

                pkt=new DatagramPacket(outBuf,outBuf.length,address,8080);
                skt.send(pkt);



            }
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}