java - Java 客户端-服务器应用程序中的 UnknownHostException

Question

我正在设计一个共享文件的Java应用程序，但是在尝试激活接收文件和发送文件的方法时，我收到一个异常，知道用户输入文件名，服务器获取它并获取文件并发送它。

Exception in thread "main" java.net.UnknownHostException: Hasan.txt at 
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177) at 
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at 
java.net.Socket.connect(Socket.java:529) at 
java.net.Socket.connect(Socket.java:478) at 
java.net.Socket.<init>(Socket.java:375) at 
java.net.Socket.<init>(Socket.java:189) at 
p2pfilesharingproject.ClientP2P.main(ClientP2P.java:25) Java Result: 1

这是我的代码

客户端代码

import java.io.*;
import java.net.*;
import java.util.*;

public class ClientP2P {

    public static void main(String argv[]) throws Exception {
        Scanner s = new Scanner(System.in);
        String sentence;
        String modifiedSentence;
        System.out.print("which Port  are you going to listen to ?");

        int Socket = s.nextInt();

        String host = s.next();
        BufferedReader inFromUser =
                new BufferedReader(new InputStreamReader(System.in));

        Socket clientSocket = new Socket(host, Socket);

        DataOutputStream outToServer =
                new DataOutputStream(clientSocket.getOutputStream());

        BufferedReader inFromServer =
                new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

        sentence = inFromUser.readLine();  
        RecieveFile(sentence);
        outToServer.writeBytes(sentence);


    }

    public static void RecieveFile(String Fname)
    {
        byte[] aByte = new byte[1];
        int bytesRead;

        Socket clientSocket = null;
        InputStream is = null;

        try {
            clientSocket = new Socket("127.0.0.1", 111);
            is = clientSocket.getInputStream();
        } catch (IOException ex) {
            // Do exception handling
        }
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        if (is != null) {

            FileOutputStream fos = null;
            BufferedOutputStream bos = null;
            try {
                fos = new FileOutputStream("E:\\"+Fname);
                bos = new BufferedOutputStream(fos);
                bytesRead = is.read(aByte, 0, aByte.length);

                do {
                        baos.write(aByte);
                        bytesRead = is.read(aByte);
                } while (bytesRead != -1);

                bos.write(baos.toByteArray());
                bos.flush();
                bos.close();
                clientSocket.close();
            } catch (IOException ex) {
                ex.getStackTrace();
            }
    }


}
}

服务器 Cpde

import java.io.*;
import java.net.*;
import java.util.*;

public class ServerP2P {

    public static void listfile() {

 String path = "C:/SAVE"; 

  String files;
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles(); 

  for (int i = 0; i < listOfFiles.length; i++) 
  {

   if (listOfFiles[i].isFile()) 
   {
   files = listOfFiles[i].getName();
   System.out.println(files);
      }
  }
    }

    public static void main(String argv[]) throws Exception {
        Scanner s = new Scanner(System.in);
        String clientSentence;
        String capitalizedSentence;
        System.out.print("Listen on Port Number : ");
        int Socket = s.nextInt();

        ServerSocket welcomeSocket = new ServerSocket(Socket);
        listfile();
        while (true) {

            Socket connectionSocket = welcomeSocket.accept();

            BufferedReader inFromClient =
                    new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));


            DataOutputStream outToClient =
                    new DataOutputStream(connectionSocket.getOutputStream());

            clientSentence = inFromClient.readLine();
            String fn = inFromClient.readLine();
            SendFile(fn);


        }
    }

    public static void SendFile(String FileName) {
        while (true) {
            ServerSocket welcomeSocket = null;
            Socket connectionSocket = null;
            BufferedOutputStream outToClient = null;

            try {
                welcomeSocket = new ServerSocket(111);
                connectionSocket = welcomeSocket.accept();
                outToClient = new BufferedOutputStream(connectionSocket.getOutputStream());
            } catch (IOException ex) {
                // Do exception handling
            }


            if (outToClient != null) {
                File myFile = new File("C:\\" + FileName);

                byte[] mybytearray = new byte[(int) myFile.length()];

                FileInputStream fis = null;

                try {
                    fis = new FileInputStream(myFile);
                } catch (FileNotFoundException ex) {
                    // Do exception handling
                }
                BufferedInputStream bis = new BufferedInputStream(fis);

                try {
                    bis.read(mybytearray, 0, mybytearray.length);
                    outToClient.write(mybytearray, 0, mybytearray.length);
                    outToClient.flush();
                    outToClient.close();
                    connectionSocket.close();

                    // File sent, exit the main method
                    return;
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
}

Answer 1

找不到名为“Hassan.txt”的服务器。确保您可以通过网络访问该套接字。 IP 地址通常是数字(除非您使用“localhost”或您的主机在 DNS 上列出)；看起来您正在使用文件名而不是主机本身。