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;
}
}
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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();
}
}
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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();
}
}
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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快网idc。
原文链接：https://blog.csdn.net/qq_43496829/article/details/104553025
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