[英]Java TCP and UDP echo in one server
我正在嘗試構建一個服務器,該服務器可以回顯來自TCP或UDP客戶端的輸入。
到目前為止,我能想到的最好的辦法是:
import java.net.*;
import java.io.*;
public class EchoServerMultiProtocol {
public static void main(String[] args) throws IOException {
String clientSentence;
String capitalizedSentence;
while (true) {
/*******************************************************************
* * Handle TCP * *
*******************************************************************/
ServerSocket TCP_Socket = new ServerSocket(6789);
Socket connectionSocket = TCP_Socket.accept();
BufferedReader inFromClient = new BufferedReader(
new InputStreamReader(connectionSocket.getInputStream()));
DataOutputStream outToClient = new DataOutputStream(
connectionSocket.getOutputStream());
clientSentence = inFromClient.readLine();
capitalizedSentence = clientSentence.toUpperCase() + '\n';
outToClient.writeBytes(capitalizedSentence);
/*******************************************************************
* * Handle UDP * *
*******************************************************************/
DatagramSocket UDP_Socket = new DatagramSocket(9876);
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
DatagramPacket receivePacket = new DatagramPacket(receiveData,
receiveData.length);
UDP_Socket.receive(receivePacket);
clientSentence = new String(receivePacket.getData());
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
capitalizedSentence = clientSentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData,
sendData.length, IPAddress, port);
UDP_Socket.send(sendPacket);
}
}
}
發生的情況是,如果我從TCP客戶端發送消息,則程序按預期運行,但從UDP客戶端沒有任何反應。 我不太熟悉客戶端/服務器通信,因此將不勝感激。
客戶代碼在下面,但我懷疑它們是問題的根源。
TCP客戶端
import java.io.*;
import java.net.*;
class EchoClientTCP {
public static void main(String argv[]) throws Exception {
String sentence;
String modifiedSentence;
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(
System.in));
Socket clientSocket = new Socket("127.0.0.1", 6789);
DataOutputStream outToServer = new DataOutputStream(
clientSocket.getOutputStream());
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(
clientSocket.getInputStream()));
sentence = inFromUser.readLine();
outToServer.writeBytes(sentence + '\n');
modifiedSentence = inFromServer.readLine();
System.out.println("FROM SERVER: " + modifiedSentence);
clientSocket.close();
}
}
UDP客戶端
import java.io.*;
import java.net.*;
class EchoClientUDP {
public static void main(String args[]) throws Exception {
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(
System.in));
DatagramSocket clientSocket = new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName("127.0.0.1");
byte[] sendData = new byte[1024];
byte[] receiveData = new byte[1024];
String sentence = inFromUser.readLine();
sendData = sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData,
sendData.length, IPAddress, 9876);
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new DatagramPacket(receiveData,
receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
System.out.println("FROM SERVER:" + modifiedSentence);
clientSocket.close();
}
}
謝謝您的幫助。
您的程序阻止等待TCP消息,因此它永遠不會看到任何UDP。
您至少需要兩個線程,每個線程一個。
接受是阻止呼叫。 它永遠不會通過UDP套接字到達代碼的一部分。
請讓您的生活更輕松,並使用Netty 。 在幾行代碼中,您有一個有效的線程模型,對大多數常用協議的支持以及一個很好的處理消息的框架。
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