import java.io.*;
import java.net.*;
import java.net.InetAddress;public class Send {
private int port=6789;
public Send() {
}
public void p2pSend(String msg,String ip){
try {
InetAddress ia=InetAddress.getByName(ip);
DatagramSocket ds=new DatagramSocket();
byte[] buf = msg.getBytes() ;
DatagramPacket dp = new DatagramPacket(buf, buf.length, ia, 8888);
ds.send(dp);
ds.close();
}catch(Exception ex) {
System.out.println("无法发送消息:" + ex );
}
}
public void allSend(String msg){
try {
InetAddress group = InetAddress.getByName("234.5.6.7");
MulticastSocket socket = new MulticastSocket(6789);
socket.joinGroup(group);
DatagramPacket hi = new DatagramPacket(msg.getBytes(),msg.getBytes().length,group,6789);
socket.send(hi);
socket.close();
}catch(Exception ex) {
System.out.println("无法发送消息:" + ex );
import java.net.*;
import java.net.InetAddress;public class Send {
private int port=6789;
public Send() {
}
public void p2pSend(String msg,String ip){
try {
InetAddress ia=InetAddress.getByName(ip);
DatagramSocket ds=new DatagramSocket();
byte[] buf = msg.getBytes() ;
DatagramPacket dp = new DatagramPacket(buf, buf.length, ia, 8888);
ds.send(dp);
ds.close();
}catch(Exception ex) {
System.out.println("无法发送消息:" + ex );
}
}
public void allSend(String msg){
try {
InetAddress group = InetAddress.getByName("234.5.6.7");
MulticastSocket socket = new MulticastSocket(6789);
socket.joinGroup(group);
DatagramPacket hi = new DatagramPacket(msg.getBytes(),msg.getBytes().length,group,6789);
socket.send(hi);
socket.close();
}catch(Exception ex) {
System.out.println("无法发送消息:" + ex );
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public void p2pSend(String msg,String ip){ //向该ip,端口号为8888的对方发msg
try {
InetAddress ia=InetAddress.getByName(ip);
DatagramSocket ds=new DatagramSocket(); //创建一个UDP Socket
byte[] buf = msg.getBytes() ;
DatagramPacket dp = new DatagramPacket(buf, buf.length, ia, 8888); //构造一个发送用的UDP包。包上指定对方的IP与端口号
ds.send(dp); //发送该UDP包
ds.close(); //关闭UDP Socket
}catch(Exception ex) {
System.out.println("无法发送消息:" + ex );
}
}
public void allSend(String msg){
try {
InetAddress group = InetAddress.getByName("234.5.6.7");
//组播组:234.5.6.7
MulticastSocket socket = new MulticastSocket(6789);
socket.joinGroup(group); //加入该组播组,成为组中成员。
DatagramPacket hi = new DatagramPacket(msg.getBytes(),msg.getBytes().length,group,6789); //构造一个发送用的UDP包(内含要发送的信息),用于向指定组中发,端口号:6789
socket.send(hi); //发送该UDP 包。此时:只有该组中的成员才能收到该UDP包。
socket.close(); //关闭组播的Socket。
}catch(Exception ex) {
System.out.println("无法发送消息:" + ex );