JAVA基于UDP的聊天程序
服务器端
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("服务器名:");
//显示服务器名称
System.out.println(InetAddress.getLocalHost().getHostName());
while (true){
byte[] inBuf =new byte[256];
//下面是取得服务器地址
DatagramPacket pkt;
//创建并设置接收pkt对象的接收信息
pkt=new DatagramPacket(inBuf,inBuf.length);
skt.receive(pkt);
//提取接收到的分组中的数据转换为字符串
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("远端端口"+pot);
System.out.println("服务器已接收到消息"+str1);
}
}
} catch (SocketException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
客户端
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"; //服务器机器名
System.out.println("请发送消息给服务器《"+serverName+"》");
try {
DatagramSocket skt=new DatagramSocket();
DatagramPacket pkt;
while (true){
BufferedReader buf;
buf=new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入信息:");
str1=buf.readLine();
byte[] outBuf=new byte[str1.length()];
outBuf=str1.getBytes();
//获取服务器端地址
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();
}
}
}