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我創建了一個小的演示,其具有的功能是:
- 在UDPClient:
+用戶輸入的兩句話:sentenceA和sentenceB
+比它們傳遞到UDPServer
- 在UDPServer:
+那些兩句話將 資本
+通過這兩個句子資本回UDPClient
的問題是,當我通過兩句話從UDPClient到UDPServer
例如:「AA」和「BB」。所以,在UDPServer中,我可以準確地獲得「aa」和「bb」。但是當我返回大寫的句子:從UDPServer到UDPClient的「AA」和「BB」時,我只能得到「AA」。在處理後,我如何在UDPClient中準確地同時獲得「AA」和「BB」?
這裏是我的代碼:
UDP客戶:
如何在Java中接收多個UDP數據報數據包?
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;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
public class UDPClient extends Thread {
static int port = 1234;
public UDPClient() {
}
@Override
public void run() {
super.run();
while (true) {
try {
DatagramSocket clientSocket = new DatagramSocket(5678);
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
InetAddress IPAddress = InetAddress.getByName("localhost");
byte[] sendData = new byte[1024];
byte[] sendData1 = new byte[1024];
byte[] receiveData = new byte[1024];
System.out.println("\nInput sentenceA : ");
String sentence = inFromUser.readLine();
System.out.println("Input sentenceB : ");
String sentence1 = inFromUser.readLine();
sendData = sentence.getBytes();
sendData1 = sentence1.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 1234);
clientSocket.send(sendPacket);
DatagramPacket sendPacket1 = new DatagramPacket(sendData1, sendData1.length, IPAddress, 1234);
clientSocket.send(sendPacket1);
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentenceA = new String(receivePacket.getData());
String modifiedSentenceB = new String(receivePacket.getData());
System.out.println("FROM SERVER : " + " sentenceA : " + modifiedSentenceA + ", sentenceB : " + modifiedSentenceB);
clientSocket.close();
} catch (SocketException ex) {
System.out.println(ex);;
} catch (UnknownHostException ex) {
System.out.println(ex);;
} catch (IOException ex) {
System.out.println(ex);
}
}
}
public static void main(String[] args) throws SocketException {
Thread t = new UDPClient();
t.start();
}
}
UDPServer:
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
public class UDPServer extends Thread{
public UDPServer(){
}
@Override
public void run() {
super.run(); //To change body of generated methods, choose Tools | Templates.
try {
DatagramSocket serverSocket = new DatagramSocket(1234);
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
byte[] sendData1 = new byte[1024];
while(true){
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
String sentence = new String(receivePacket.getData());
String sentence1 = new String(receivePacket.getData());
System.out.println("RECEIVED " + sentence + " sentence1 : " + sentence1);
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String capitalizedSentence = sentence.toUpperCase();
String b = sentence1.toUpperCase();
sendData = capitalizedSentence.getBytes();
sendData1 = b.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
DatagramPacket sendPacket1 = new DatagramPacket(sendData1, sendData1.length, IPAddress, port);
serverSocket.send(sendPacket1);
}
} catch (SocketException ex) {
System.out.println(ex);;
} catch (IOException ex) {
System.out.println(ex);;
}
}
public static void main(String[] args){
Thread serverThead = new UDPServer();
serverThead.start();
}
}
我嘗試在客戶端聲明2個數據包,然後從這2個數據包中獲取數據,但沒有任何更改。 –
不,你*不是*宣佈接收兩個數據包。您正在聲明兩個數據包,它們是*發送的,*未接收的,並且您不會從它們接收任何數據:您發送它。你正在聲明*一個*包,並且你一次接收*,然後打印兩次。兩張照片之間爲什麼會發生變化?你看起來並不理解你自己的代碼。 – EJP