Java Client Server 聊天程序

Question

I got a code from the internet for a Client and Server to communicate in java. I modified it a bit, so that the server and client are able to chat to each other.

Initially my client sends a message to server, then server to client, then client to server and it goes on...(one cannot send more than one message continuously to the other). For this there is a basic code put in the while loop so that the conversation goes on 1 to 1. But as i put the while loop, the message from server is not received by client. If there is no while loop(which i have commented in the code here), then first the message is sent by client to server and then server to client and the program stops.

Please help me in making the chat go endlessly.

//SERVER
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

    private static Socket socket;

    public static void main(String[] args)
    {
        try
        {
            int port = 25000;
            ServerSocket serverSocket = new ServerSocket(port);
            socket = serverSocket.accept();
            System.out.println("Server Started and listening to the port 25000");
            //while(true){
                //Server is running always. This is done using this while(true) loop
                //Reading the message from the client

                InputStream is = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                String number = br.readLine();
                System.out.println("Received from client: "+number+"\n");

                BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in));
                String s = bufferRead.readLine();

                //Sending the response back to the client.
                OutputStream os = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(os);
                BufferedWriter bw = new BufferedWriter(osw);
                bw.write(s);
                bw.flush();
                System.out.println("Sent (to " + socket + ") client: "+s+"\n");

                //String abc = bufferRead.readLine();
                //System.out.println("SAA");
            //}
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                socket.close();
            }
            catch(Exception e){}
        }
    }
}


//CLIENT
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.Socket;

public class Client {

    private static Socket socket;

    public static void main(String args[])
    {   
        try
        {
            String host = "localhost";
            int port = 25000;
            InetAddress address = InetAddress.getByName(host);
            socket = new Socket(address, port);

            //while(true){
                //Send the message to the server
                OutputStream os = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(os);
                BufferedWriter bw = new BufferedWriter(osw);

                BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in));
                String s = bufferRead.readLine();

                String sendMessage = s + "\n";
                bw.write(sendMessage);
                bw.flush();
                System.out.println("Sent to server: " +sendMessage+"\n");

                //Get the return message from the server
                InputStream is = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                System.out.println(socket);
                String message = br.readLine();
                System.out.println("Received from server: "+message+"\n");
            //}
        }
        catch (Exception exception)
        {
            exception.printStackTrace();
        }
        finally
        {
            //Closing the socket
            try
            {
                socket.close();
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
        }
    }
}

Answer 1

Server.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.*;

public class Server implements Runnable {

ServerSocket serversocket;
BufferedReader br1, br2;
PrintWriter pr1;
Socket socket;
Thread t1, t2;
String in="",out="";

public Server() {
    try {
        t1 = new Thread(this);
        t2 = new Thread(this);
        serversocket = new ServerSocket(5000);
        System.out.println("Server is waiting. . . . ");
        socket = serversocket.accept();
        System.out.println("Client connected with Ip " +        socket.getInetAddress().getHostAddress());
        t1.start();;
        t2.start();

    } catch (Exception e) {
    }
 }

 public void run() {
    try {
        if (Thread.currentThread() == t1) {
            do {
                br1 = new BufferedReader(new InputStreamReader(System.in));
                pr1 = new PrintWriter(socket.getOutputStream(), true);
                in = br1.readLine();
                pr1.println(in);
            } while (!in.equals("END"));
        } else {
            do {
                br2 = new BufferedReader(new   InputStreamReader(socket.getInputStream()));
                out = br2.readLine();
                System.out.println("Client says : : : " + out);
            } while (!out.equals("END"));
        }
    } catch (Exception e) {
    }
}

public static void main(String[] args) {
    new Server();
}
}

Client.java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.*;

public class Client implements Runnable {

BufferedReader br1, br2;
PrintWriter pr1;
Socket socket;
Thread t1, t2;
String in = "", out = "";

public Client() {
    try {
        t1 = new Thread(this);
        t2 = new Thread(this);
        socket = new Socket("localhost", 5000);
        t1.start();;
        t2.start();

    } catch (Exception e) {
    }
}

public void run() {

    try {
        if (Thread.currentThread() == t2) {
            do {
                br1 = new BufferedReader(new InputStreamReader(System.in));
                pr1 = new PrintWriter(socket.getOutputStream(), true);
                in = br1.readLine();
                pr1.println(in);
            } while (!in.equals("END"));
        } else {
            do {
                br2 = new BufferedReader(new   InputStreamReader(socket.getInputStream()));
                out = br2.readLine();
                System.out.println("Server says : : : " + out);
            } while (!out.equals("END"));
        }
    } catch (Exception e) {
    }

 }

 public static void main(String[] args) {
     new Client();
 }
 }

Answer 2

 //server.java import java.io.*; import java.net.*; public class server { public static void main(String []V){ try{ ServerSocket ss = new ServerSocket(1201); Socket s = ss.accept(); DataInputStream Din = new DataInputStream(s.getInputStream()); DataOutputStream Dout = new DataOutputStream(s.getOutputStream()); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String MsgIn="",MsgOut=""; while(!MsgIn.equals("end")){ MsgIn = Din.readUTF(); System.out.println(MsgIn); MsgOut = br.readLine(); Dout.writeUTF(MsgOut); Dout.flush(); } s.close(); }catch(Exception e){ } } } //clients.java import java.io.*; import java.net.*; import javax.xml.crypto.Data; public class clients { public static void main(String []S){ try{ Socket s = new Socket("192.168.0.103",1201);//my pc's ip //Socket s = new Socket("192.168.0.100",1201); DataInputStream Din = new DataInputStream(s.getInputStream()); DataOutputStream Dout = new DataOutputStream(s.getOutputStream()); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String MsgIn="",MsgOut=""; while(!MsgIn.equals("end")){ MsgOut = br.readLine(); Dout.writeUTF(MsgOut); MsgIn = Din.readUTF(); System.out.println(MsgIn); } }catch(Exception e){ } } }

Answer 3

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

class serversvi1
{
    public static void main(String svi[])throws IOException
    {
        try
        {
            ServerSocket servsock=new ServerSocket(5510);
            DataInputStream dis=new DataInputStream(System.in);
            System.out.println("enter the file name");
            String fil=dis.readLine();
            System.out.println(fil+" :is file transfer");
            File myfile=new File(fil);

            while(true)
            {
                Socket sock=servsock.accept();
                byte[] mybytearray=new byte[(int)myfile.length()];
                BufferedInputStream bis=new BufferedInputStream(new FileInputStream(myfile));
                bis.read(mybytearray,0,mybytearray.length);
                OutputStream os=sock.getOutputStream();
                os.write(mybytearray,0,mybytearray.length);
                os.flush();
                sock.close();

            }
        }

        catch(Exception saranvi)
        {
            System.out.print(saranvi);
        }
    }
}

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

class clientsvi1
{
    public static void main(String svi[])throws IOException
    {
        try
        {
            Socket sock=new Socket("localhost",5510);
            byte[] bytearray=new byte[1024];
            InputStream is=sock.getInputStream();
            DataInputStream dis=new DataInputStream(System.in);
            System.out.println("enter the file name");
            String fil=dis.readLine();
            FileOutputStream fos=new FileOutputStream(fil);
            BufferedOutputStream bos=new BufferedOutputStream(fos);
            int bytesread=is.read(bytearray,0,bytearray.length);
            bos.write(bytearray,0,bytesread);
            System.out.println("out.txt file is received");
            bos.close();
            sock.close();
        }

        catch(Exception SVI)
        {
            System.out.print(SVI);
        }
    }
}