Question

以下是我的两个相互连接的程序：

SERVER

package authenticateddns;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;

public class Server {
    public static final int PORT = 4444;
    int clientNumber;
    static String[][] url = new String[8][2];

    public static void main(String args[]) throws IOException {
        url[0][0] = "www.google.com";
        url[0][1] = "172.217.11.174";
        url[1][0] = "www.facebook.com";
        url[1][1] = "31.13.77.36";
        url[2][0] = "www.youtube.com";
        url[2][1] = "74.125.65.91";
        url[3][0] = "www.wikipedia.org";
        url[3][1] = "91.198.174.192";
        url[4][0] = "www.twitter.com";
        url[4][1] = "199.59.149.230";
        url[5][0] = "www.amazon.com";
        url[5][1] = "72.21.211.176";
        url[6][0] = "www.yahoo.com";
        url[6][1] = "98.137.149.56";
        url[7][0] = "www.abc.com";
        url[7][1] = "199.181.132.250";

        new Server().runServer();
    }

    public void runServer() throws IOException {
        ServerSocket serverSocket = new ServerSocket(PORT);
        System.out.println("Server up and ready for connection...");
        while (true) {
            ThreadPoolExecutor pool = (ThreadPoolExecutor) Executors.newCachedThreadPool();
            Socket socket = serverSocket.accept();
            pool.submit(() -> new ServerThread(socket, clientNumber, url).start());
            System.out.println("New client has joined");
            clientNumber++;
        }
    }
}

SERVERTHREAD

package authenticateddns;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class ServerThread extends Thread {

    Socket socket;
    String clientName;
    int clientN;
    String url[][];

    byte[] message = new byte[4];

    ServerThread(Socket socket, int clientNumber, String[][] url)
    {
        this.socket = socket;
        clientN = clientNumber;
        this.url=url;
        message[0]=1;
        message[1]=2;
        message[2]=3;
        message[3]=4;
    }

    public void run()
    {
        try
        {
            String userURL;
            String ip = "";
            clientName = "Client" + clientN;

            //this is from the server
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            //this is from the client
            PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);

            DataOutputStream dout = new DataOutputStream(socket.getOutputStream());
            //dout.writeInt(message.length);
            //dout.write(message);
            //this reads in from client
            while(true)
            {
                if((userURL = bufferedReader.readLine()) != null)
                {
                    userURL = userURL.replace("\n", "").replace("\r", "");

                    for(int i = 0; i < 8; i++)
                    {
                        if(url[i][0].equals(userURL))
                        {
                            ip = url[i][1];
                            break;
                        }
                        if(!url[i][0].equals(userURL)&&i==7)
                        {
                            ip = "IP Address not found";
                        }
                    }

                    //System.out.println(clientName);
                    System.out.println("    " + clientName + ": Desired URL: " + userURL);
                    System.out.println("    " + clientName + ": Sending IP: " + ip);
                    System.out.println("");

                    //send this to client
                    printWriter.println("Server Recieved Message");
                    printWriter.println(ip);
                    dout.write(message);
                    System.out.println("worked");
                }

                //socket.close();    
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }

}

然后你有客户计划

package client;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.InetAddress;

public class Client {

    public static void main(String[] args) throws IOException
    {
        //InetAddress localIP;
        //localIP = InetAddress.getLocalHost();
        //Socket socket = new Socket("10.0.36.89", 4444);
        Socket socket = new Socket("10.1.43.10", 4444);
        String ip;
        String confirm;
        int length;

        // from client
        PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader buffedReader = new java.io.BufferedReader(new InputStreamReader(System.in));

        //from server
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        DataInputStream din = new DataInputStream(socket.getInputStream());

        while(true)
        {

            //this sends input            
            System.out.print("Enter Destired URL: ");

            String readerInput = buffedReader.readLine();
            readerInput = readerInput.replace("Enter Destired URL: ", "");
            printWriter.println(readerInput);

            if((confirm = bufferedReader.readLine()) != null)
            {
                System.out.println(confirm);
            }

            //this reads in from server
            if((ip = bufferedReader.readLine()) != null)
            {
                System.out.println("Server returns IP Address: " + ip);
                System.out.println("");
            }

            int j = 4;
            byte[] message = new byte[4];
            if(j>0)
            {
                din.readFully(message, 0, 4); // read the message
                j=j-1;
            }

            for(int i = 0; i < 4; i++)
            {
                System.out.print(message[i]);
            }

        }
    }

}

问题是客户端没有收到字节数组。它仅在您在调试器中运行Server程序并在其写入Client的位置放置断点时才有效。

有没有人有任何想法？

编程服务器和客户端发送和接收字节数组

0 个答案: