implement tcp server for transferring files using socket and serversocket

1//Client
2import java.io.*;
3import java.net.*;
4
5public class Client {
6
7    public static void main(String[] args) throws Exception {
8        Socket s = new Socket("127.0.0.1", 1234);
9        if (s.isConnected()) {
10            System.out.println("Connected to server");
11        }
12        FileOutputStream fout = new FileOutputStream("received.txt");
13        DataInputStream din = new DataInputStream(s.getInputStream());
14        int r;
15        while ((r = din.read()) != -1) {
16            fout.write((char) r);
17        }
18        s.close();
19    }
20
21}
22
23//Server
24import java.io.*;
25import java.net.*;
26
27class Server {
28    public static void main(String args[]) throws Exception {
29        ServerSocket ss = new ServerSocket(1234);
30        Socket s = ss.accept();
31        System.out.println("connected..........");
32        FileInputStream fin = new FileInputStream("Send.txt");
33        DataOutputStream dout = new DataOutputStream(s.getOutputStream());
34        int r;
35        while ((r = fin.read()) != -1) {
36            dout.write(r);
37
38        }
39        System.out.println("\nFiletranfer Completed");
40        s.close();
41        ss.close();
42    }
43}