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Copy pathUDPServer.java
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72 lines (65 loc) · 2.83 KB
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package org.renlr.test;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class UDPServer {
public static void main(String[] args) {
try {
DatagramSocket server = new DatagramSocket(2008);
byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
String sendMessage132 = "";
String sendMessage129 = "";
int port132 = 0;
int port129 = 0;
InetAddress address132 = null;
InetAddress address129 = null;
for (;;) {
server.receive(packet);
String receiveMessage = new String(packet.getData(), 0, packet.getLength());
System.out.println(receiveMessage);
//接收到clientA
if (receiveMessage.contains("132")) {
port132 = packet.getPort();
address132 = packet.getAddress();
sendMessage132 = "host:" + address132.getHostAddress() + ",port:" + port132;
}
//接收到clientB
if (receiveMessage.contains("129")) {
port129 = packet.getPort();
address129 = packet.getAddress();
sendMessage129 = "host:" + address129.getHostAddress() + ",port:" + port129;
}
//两个都接收到后分别A、B址地交换互发
if (!sendMessage132.equals("") && !sendMessage129.equals("")) {
send132(sendMessage129, port132, address132, server);
send129(sendMessage132, port129, address129, server);
sendMessage132 = "";
sendMessage129 = "";
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static void send129(String sendMessage132, int port132, InetAddress address132, DatagramSocket server) {
try {
byte[] sendBuf = sendMessage132.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendBuf, sendBuf.length, address132, port132);
server.send(sendPacket);
System.out.println("消息发送成功!");
} catch (Exception e) {
e.printStackTrace();
}
}
private static void send132(String sendMessage129, int port129, InetAddress address129, DatagramSocket server) {
try {
byte[] sendBuf = sendMessage129.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendBuf, sendBuf.length, address129, port129);
server.send(sendPacket);
System.out.println("消息发送成功!");
} catch (Exception e) {
e.printStackTrace();
}
}
}