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

public class UDPReceive {
 public static void main(String[] args) throws IOException {

  System.out.println("接收端啟動(dòng)......");

  // 1、建立UDP的Socket服務(wù)
  DatagramSocket ds = new DatagramSocket(10000);

  // 2、創(chuàng)建數(shù)據(jù)包
  byte[] buf = new byte[1024];
  DatagramPacket dp = new DatagramPacket(buf, buf.length);

  // 3、使用接收方法將數(shù)據(jù)存儲(chǔ)到數(shù)據(jù)包中
  ds.receive(dp); // 該方法為阻塞式的方法

  // 4、通過數(shù)據(jù)包對(duì)象的方法解析這些數(shù)據(jù)，例如：地址、端口、數(shù)據(jù)內(nèi)容等
  String ip = dp.getAddress().getHostAddress();
  int port = dp.getPort();
  String text = new String(dp.getData(), 0, dp.getLength());

  System.out.println(ip + ":" + port + ":" + text);

  // 5、關(guān)閉Socket服務(wù)
  ds.close();
 }
}

/**
*優(yōu)化UDP傳輸?shù)陌l(fā)送端
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPSend {
 public static void main(String[] args) throws IOException {

  System.out.println("發(fā)送端啟動(dòng)......");

  // 創(chuàng)建UDP的Socket，使用DatagramSocket對(duì)象
  DatagramSocket ds = new DatagramSocket();

  BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
  String line = null;
  while ((line = bufr.readLine()) != null) {
   // 使用DatagramPacket將數(shù)據(jù)封裝到該對(duì)象的包中
   byte[] buf = line.getBytes();
   DatagramPacket dp = new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.191.1"), 10000);
   // 通過UDP的Socket服務(wù)將數(shù)據(jù)包發(fā)送出去，使用send方法
   ds.send(dp);
   // 如果輸入信息為over，則結(jié)束循環(huán)
   if ("over".equals(line))
    break;
  }
  // 關(guān)閉Socket服務(wù)
  ds.close();
 }
}

/**
*優(yōu)化UDP傳輸?shù)慕邮斩?
*/
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UDPReceive {
 public static void main(String[] args) throws IOException {

  System.out.println("接收端啟動(dòng)......");

  // 建立UDP的Socket服務(wù)
  DatagramSocket ds = new DatagramSocket(10000);

  while(true) {
   // 創(chuàng)建數(shù)據(jù)包
   byte[] buf = new byte[1024];
   DatagramPacket dp = new DatagramPacket(buf, buf.length);

   // 使用接收方法將數(shù)據(jù)存儲(chǔ)到數(shù)據(jù)包中
   ds.receive(dp); // 該方法為阻塞式的方法

   // 通過數(shù)據(jù)包對(duì)象的方法解析這些數(shù)據(jù)，例如：地址、端口、數(shù)據(jù)內(nèi)容等
   String ip = dp.getAddress().getHostAddress();

   int port = dp.getPort();
   String text = new String(dp.getData(), 0, dp.getLength());
   System.out.println(ip + ":" + port + ":" + text);
  }
 }
}

/**
*創(chuàng)建UDP傳輸下的聊天室發(fā)送端
*/
package chat;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class Send implements Runnable {

 private DatagramSocket ds;

 public Send(DatagramSocket ds) {
  this.ds = ds;
 }

 public void run() {
  try {
   BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
   String line = null;
   while ((line = bufr.readLine()) != null) {
    byte[] buf = line.getBytes();
    DatagramPacket dp = new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.191.255"), 10001);
    ds.send(dp);
    if ("886".equals(line))
     break;
   }
   ds.close();
  } catch (Exception e) {
   System.out.println("對(duì)不起，發(fā)生錯(cuò)誤啦！");
  }
 }
}

/**
*創(chuàng)建UDP傳輸下的聊天室接收端
*/
package chat;

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class Rece implements Runnable {

 private DatagramSocket ds;

 public Rece(DatagramSocket ds) {
  this.ds = ds;
 }

 public void run() {
  try {
   while (true) {
    byte[] buf = new byte[1024];
    DatagramPacket dp = new DatagramPacket(buf, buf.length);
    ds.receive(dp);
    String ip = dp.getAddress().getHostAddress();
    String text = new String(dp.getData(), 0, dp.getLength());
    System.out.println(ip + ":::" + text);
    if(text.equals("886")){
     System.out.println(ip+"......退出聊天室！");
    }
   }
  } catch (Exception e) {
   System.out.println("對(duì)不起，發(fā)生錯(cuò)誤啦！");
  }
 }
}

/**
*創(chuàng)建UDP傳輸下的聊天室
*/
package chat;

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

public class ChatRoom {
 public static void main(String[] args) throws IOException {
  DatagramSocket send = new DatagramSocket();
  DatagramSocket rece = new DatagramSocket(10001);
  new Thread(new Send(send)).start();
  new Thread(new Rece(rece)).start();
 }
}