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私のUDP Javaプログラムは、Casesから正しい文を返しません。 プログラムは4つの異なる質問に対して4つの異なる答えを返さなければなりません。 しかし、唯一私が受けた答えは、デフォルトの答えはサーバーが例の方法 に 『文』を渡そうとしたとき、私はいくつかの問題があると思い は私がコードで何かが足りないのですか?UDP Java、正しいケースの返答を返しません。
サーバクラス
package pac1;
import java.net.*;
import java.io.*;
public class Server {
public static void main(String args[]) throws Exception{
System.out.println("UDP Server: Started");
DatagramSocket serverSocket =new DatagramSocket(9878);
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
while (true){
DatagramPacket receivePacket = new DatagramPacket(receiveData,
receiveData.length);
serverSocket.receive(receivePacket);
String sentence = new String(receivePacket.getData());
System.out.println("UDP Server Received: "+sentence);
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String out;
out=getAnswer(sentence);
System.out.println(sentence);
sendData= out.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData,
sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
System.out.println("UDP Server Sending to Client: "+out);
}
}
private static String getAnswer(String sentence) {
String out;
switch(sentence) {
case "A" : out = "65";
break;
case "B" : out = "66";
break;
case "C" : out = "67";
break;
case "D" : out = "68";
break;
default: out = "Answer not found";
break;
}
return out;
}
}
「が見つかりませんANSWER」であります
クライアントクラス
import java.net.*;
import java.util.Scanner;
import java.io.*;
public class Client {
public static void main(String args[]) throws Exception{
System.out.println("UDP Client: Started");
String url = "rmi:///";
System.out.println("Enter Question: ");
Scanner myinput = new Scanner(System.in);
String sentence = myinput.nextLine();
DatagramSocket clientSocket =new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName("localhost");
byte[] sendData = new byte[1024];
byte[] receiveData = new byte[1024];
sendData =sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData,
sendData.length, IPAddress, 9878);
System.out.println("UDP Client: Sending "+ sentence);
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new DatagramPacket(receiveData,
receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
System.out.println("UDP Client: Received From Server; "+ modifiedSentence);
clientSocket.close();
}
}
ありがとうございましたsentence = sentence.trim() – Tom
より良いアプローチは、実際の長さ 'String sentence = new String(receivePacket.getData()、0、receivePacket.getLength());を使用することです。 –