Java--UDP,接收方接收发送方的数据（单向）

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 SendDemo1 {

private static final int PORT = 8080;
private static final String IP = "localhost";
public static void main(String[] args) {
sendHandler();
}

private static void sendHandler(){
DatagramSocket sendSocket = null;
try {
while(true){
//创建套接字
sendSocket = new DatagramSocket();
//键盘录入
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String send = br.readLine();
byte[] buf = send.getBytes();
//设定数据包内容，长度，发送到的地址和端口
DatagramPacket dp = new DatagramPacket(buf, buf.length, InetAddress.getByName(IP), PORT);
//发送数据包
sendSocket.send(dp);
}
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(sendSocket != null){
sendSocket.close();
}
}
}
}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class ReceiverDemo1 {

private static final int PORT = 8080;
public static void main(String[] args) {
receiveHandler();
}

private static void receiveHandler() {
DatagramSocket receiveSocket = null;
try {
//在8080端口监听
receiveSocket = new DatagramSocket(PORT);
//while循环，一直在等待接收数据
while(true){
//创建一个包，并接收数据
byte[] buf = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf, buf.length);
receiveSocket.receive(dp);

//取得IP地址和包里的数据内容
String ip = dp.getAddress().getHostAddress();
String data = new String(dp.getData(), 0, dp.getLength());

System.out.println(ip + ":" + data);
}
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(receiveSocket != null){
receiveSocket.close();
}
}
}
}