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TCPServer.java
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TCPServer.java
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import java.io.*;
import java.net.*;
import java.util.*;
public class TCPServer {
public static void main(String args[]) throws Exception {
// if at least two argument are passed, consider the first one as directory path
// and the second one as port number
// If port number is not present, default it to 3333
// If directory path is not present, show error
if(args.length == 0) {
System.out.println("Please enter the server directory address as first argument while running from command line.");
}
else {
int id = 1;
System.out.println("Server started...");
System.out.println("Waiting for connections...");
ServerSocket welcomeSocket;
// port number is passed by the user
if(args.length >= 2){
welcomeSocket = new ServerSocket(Integer.parseInt(args[1]));
}
else{
welcomeSocket = new ServerSocket(3333);
}
while (true) {
Socket connectionSocket = welcomeSocket.accept();
System.out.println("Client with ID " + id + " connected from " + connectionSocket.getInetAddress().getHostName() + "...");
Thread server = new ThreadedServer(connectionSocket, id, args[0]);
id++;
server.start();
}
}
}
}
class ThreadedServer extends Thread {
int n;
int m;
String name, f, ch, fileData;
String filename;
Socket connectionSocket;
int counter;
String dirName;
public ThreadedServer(Socket s, int c, String dir) {
connectionSocket = s;
counter = c;
// set dirName to the one that's entered by the user
dirName = dir;
}
public void run() {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
InputStream inFromClient = connectionSocket.getInputStream();
PrintWriter outPw = new PrintWriter(connectionSocket.getOutputStream());
OutputStream output = connectionSocket.getOutputStream();
ObjectOutputStream oout = new ObjectOutputStream(output);
oout.writeObject("Server says Hi!");
File ff = new File(dirName);
ArrayList<String> names = new ArrayList<String>(Arrays.asList(ff.list()));
int len = names.size();
oout.writeObject(String.valueOf(names.size()));
for(String name: names) {
oout.writeObject(name);
}
name = in.readLine();
ch = name.substring(0, 1);
if (ch.equals("*")) {
n = name.lastIndexOf("*");
filename = name.substring(1, n);
FileInputStream file = null;
BufferedInputStream bis = null;
boolean fileExists = true;
System.out.println("Request to download file " + filename + " recieved from " + connectionSocket.getInetAddress().getHostName() + "...");
filename = dirName + filename;
//System.out.println(filename);
try {
file = new FileInputStream(filename);
bis = new BufferedInputStream(file);
}
catch (FileNotFoundException excep) {
fileExists = false;
System.out.println("FileNotFoundException:" + excep.getMessage());
}
if (fileExists) {
oout = new ObjectOutputStream(output);
oout.writeObject("Success");
System.out.println("Download begins");
sendBytes(bis, output);
System.out.println("Completed");
bis.close();
file.close();
oout.close();
output.close();
}
else {
oout = new ObjectOutputStream(output);
oout.writeObject("FileNotFound");
bis.close();
file.close();
oout.close();
output.close();
}
}
else{
try {
boolean complete = true;
System.out.println("Request to upload file " + name + " recieved from " + connectionSocket.getInetAddress().getHostName() + "...");
File directory = new File(dirName);
if (!directory.exists()) {
System.out.println("Dir made");
directory.mkdir();
}
int size = 9022386;
byte[] data = new byte[size];
File fc = new File(directory, name);
FileOutputStream fileOut = new FileOutputStream(fc);
DataOutputStream dataOut = new DataOutputStream(fileOut);
while (complete) {
m = inFromClient.read(data, 0, data.length);
if (m == -1) {
complete = false;
System.out.println("Completed");
} else {
dataOut.write(data, 0, m);
dataOut.flush();
}
}
fileOut.close();
} catch (Exception exc) {
System.out.println(exc.getMessage());
}
}
}
catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
private static void sendBytes(BufferedInputStream in , OutputStream out) throws Exception {
int size = 9022386;
byte[] data = new byte[size];
int bytes = 0;
int c = in .read(data, 0, data.length);
out.write(data, 0, c);
out.flush();
}
}