本文实例为大家分享了UDP实现聊天室功能的具体代码，供大家参考，具体内容如下
项目结构
data.java
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package udp;import java.net.InetAddress;public class data { InetAddress Address; int Port; public InetAddress getAddress() { return Address; } public void setAddress(InetAddress address) { Address = address; } public int getPort() { return Port; } public void setPort(int port) { Port = port; }} |
服务器端
Server.java
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package udp;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.util.ArrayList;public class Server { DatagramSocket socket = null; ArrayList<data> client; public Server() { try { socket = new DatagramSocket(8888); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } client = new ArrayList<data>(); } public void s_r(){ try { while(true) { byte[] buf = new byte[3000]; //接收数据的数据包 DatagramPacket packet = new DatagramPacket(buf,buf.length); socket.receive(packet); //地址 InetAddress clientAddress = packet.getAddress(); //端口号 int clientPort = packet.getPort(); data d = new data(); d.setAddress(clientAddress); d.setPort(clientPort); int i=0; //判断客户端集合里是否存在发送新消息的客户端 for(;i<client.size();i++) { if(client.get(i).getAddress().equals(clientAddress)&&client.get(i).getPort()==clientPort) { break; } } if(i==client.size()) { client.add(d); } String s=new String(packet.getData()).trim()+"来自:"+clientAddress.getHostAddress()+":"+clientPort; System.out.println(s); //把信息发给每个客户端 for(data c:client) { try { //地址 InetAddress cAddress = c.getAddress(); //端口号 int cPort = c.getPort(); buf = s.getBytes(); //创建要发送的数据包 packet = new DatagramPacket(buf,buf.length,cAddress,cPort); socket.send(packet); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } 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(); } } public static void main(String[] args) { Server s = new Server(); s.s_r(); }} |
客户端
package udp;
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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;import java.net.UnknownHostException;public class Client { DatagramSocket socket = null; DatagramPacket packet; InetAddress address = null; Client(){ try { socket = new DatagramSocket(); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void s_r() { try { // 把表示服务器端IP地址的字符串转换成InetAddress对象 address = InetAddress.getByName("127.0.0.1"); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } String s = "登陆"; byte[] b = s.getBytes(); packet = new DatagramPacket(b,b.length,address,8888); try { socket.send(packet); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } //发送消息的线程 new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub String sendStr; BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in)); try { while((sendStr = stdIn.readLine())!=null) { byte[] buf = sendStr.getBytes(); packet = new DatagramPacket(buf,buf.length,address,8888); socket.send(packet); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); //接收消息的线程 new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub byte[] buf_1 = new byte[3000]; // 使用空字节数组构造空数据包 DatagramPacket packet = new DatagramPacket(buf_1,buf_1.length); try { while(true) { socket.receive(packet); String received = new String(packet.getData(),0,packet.getLength()).trim(); System.out.println("接收到的信息:"+received); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } public static void main(String[] args) { Client c = new Client(); c.s_r(); } } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_43496829/article/details/104553025
