我正在學習Java中的套接字，我只想到如何從服務器接收回應答。拒絕客戶端到服務器的連接
繼How to send string array object和How to send and receive serialized object in socket channel，我想詢問用戶，他希望儘可能多的挑選出的選擇：
1 - 2 - 3 - 4
然後我想分裂，並將其作爲陣列到服務器，服務器應該發回用戶選擇的選擇數量。
例如，如果用戶選擇
2 3 4 1 2 3 4 1
服務器應該返回
8
服務器發送響應正常，但在客戶端，我得到錯誤：
Exception in thread "main" java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.(Unknown Source) at java.net.Socket.(Unknown Source) at ClientClass.main(ClientClass.java:26)
我我不知道爲什麼這個問題。任何幫助？
我的客戶：
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Scanner;
public class ClientClass {
public static void main(String args[]) throws IOException, ClassNotFoundException
{
// take order and convert it to array of choices
Scanner myScanner = new Scanner(System.in); // take from user
System.out.println("Enter all your choices seperated by space:");
System.out.println("Choices are: 1- 2- 3- 4");
String orderString = myScanner.next();
orderString += myScanner.nextLine();
String orderArray[] = orderString.split(" ");
// send request to server
Socket mySocket = new Socket("127.0.0.1", 4444); // create a socket
ObjectOutputStream out = new ObjectOutputStream(mySocket.getOutputStream());
out.writeObject(orderArray);
// get response from server
InputStream is = mySocket.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String message = br.readLine();
System.out.println("Message received from the server : " +message);
}
}
我的服務器：
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.PrintStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.channels.SocketChannel;
import java.util.Scanner;
public class ServerClass {
public static void main(String args[]) throws IOException, ClassNotFoundException
{
// receive
ServerSocket myServerSocket = new ServerSocket(4444); // create a server socket
Socket mySimpleSocket = myServerSocket.accept(); // accept requests
ObjectInputStream ois = new ObjectInputStream(mySimpleSocket.getInputStream());
String[] choices = (String[]) ois.readObject();
// send back response
OutputStream os = mySimpleSocket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
bw.write(choices.length);
System.out.println("Message sent to the client is "+choices.length);
bw.flush();
}
}