Develop Reference

Having trouble sending one password attempt at a time (Java)

I am trying to do an extra credit assignment for my Java class where we are attempting to hack into a server. The problem I am having right now is only sending one password at a time:
import java.io.*;
import java.net.*;
import java.util.Scanner;
public class Client
{
private Socket socket;
private PrintWriter out;
private BufferedReader in;
private static int passwordLength;
private static String attempt;
private static int counter = 0;
private static String acceptable = "ABCDEFGHIJKLMNOPQRSTUVWXYXZabcdefghijklmnopqrstuvwxyz0123456789";
public Client()
{
try
{
System.out.println("Connecting to server...");
socket = new Socket("localhost", 58999);
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
}
catch (Exception e)
{
System.out.println("Run the server first.");
}
}
public void close()
{
try
{
socket.close();
}
catch (IOException e)
{
System.out.println(e.getMessage());
}
}
public String sendPassword(String pass)
{
if (!HUSH) System.out.print("Sending: " + pass);
out.println(pass);
String result = null;
try
{
result = in.readLine();
if (!HUSH)
{
if (result.equals("no"))
System.out.println(" (wrong password)");
else if (result.equals("yes"))
System.out.println(" (CORRECT!)");
}
}
catch (IOException e)
{
System.out.println(e.getMessage());
}
return result;
}
public static boolean HUSH = false;
public static void main(String[] args)
{
Client me = new Client();
//BEGIN YOUR WORK
int length;
HUSH = false; //change this to false for testing
System.out.println("Input character length");
Scanner ui = new Scanner(System.in);
length = ui.nextInt();
Client(length);//set the max length of the password
generate();//pull into the first generate method
me.sendPassword("1234");
me.sendPassword(attempt); //the first password i am trying to break
me.sendPassword("letmein");
me.sendPassword("willthiswork");
// END YOUR WORK
me.close();
}
public static void Client(int max)
{
passwordLength = max;
}
public static void generate()
{
generate(""); //enters generate(String password)
}
static void generate(String password)
{
//base case
if(password.length() == passwordLength)//if password is long enough
System.out.println(++counter + " " + password);
else
for(int x = 0; x < acceptable.length(); x++)
generate(attempt = password + acceptable.charAt(x));
}
}
When I run the code (using the server that is supplied), it runs every possible password combination, but returns 9 (passwordLength number of times) instead of sending say..... A (wrong password) B (wrong password) so on and so forth. I know I need to add something onto my for loop to call it back to main, but I'm not sure how to.

How do I fix this Array Index out of Bounds Exception?

I am trying to study a multi-client chat server. As i'm new in Java, I am unable to run this two .java files in Net beans. I have two java projects and put I these files under them. Server project runs successfully but client project shows:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at chatClient.main(chatClient.java:73)
Client Project
import java.net.*;
import java.io.*;
import java.util.*;
import java.awt.*;
class chatClient extends Frame implements Runnable {
Socket soc;
TextField tf;
TextArea ta;
Button btnSend, btnClose;
String sendTo;
String LoginName;
Thread t = null;
DataOutputStream dout;
DataInputStream din;
chatClient(String LoginName, String chatwith) throws Exception {
super(LoginName);
this.LoginName = LoginName;
sendTo = chatwith;
tf = new TextField(50);
ta = new TextArea(50, 50);
btnSend = new Button("Send");
btnClose = new Button("Close");
soc = new Socket("127.0.0.1", 5217);
din = new DataInputStream(soc.getInputStream());
dout = new DataOutputStream(soc.getOutputStream());
dout.writeUTF(LoginName);
t = new Thread(this);
t.start();
}
void setup() {
setSize(600, 400);
setLayout(new GridLayout(2, 1));
add(ta);
Panel p = new Panel();
p.add(tf);
p.add(btnSend);
p.add(btnClose);
add(p);
show();
}
public boolean action(Event e, Object o) {
if (e.arg.equals("Send")) {
try {
dout.writeUTF(sendTo + " " + "DATA" + " " + tf.getText().toString());
ta.append("\n" + LoginName + " Says:" + tf.getText().toString());
tf.setText("");
} catch (Exception ex) {
}
} else if (e.arg.equals("Close")) {
try {
dout.writeUTF(LoginName + " LOGOUT");
System.exit(1);
} catch (Exception ex) {
}
}
return super.action(e, o);
}
public static void main(String args[]) throws Exception {
chatClient Client1 = new chatClient(args[0],args[1]);
Client1.setup();
}
public void run() {
while (true) {
try {
ta.append("\n" + sendTo + " Says :" + din.readUTF());
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
Server Project
import java.net.*;
import java.util.*;
import java.io.*;
class chatServer {
static Vector ClientSockets;
static Vector LoginNames;
chatServer() throws Exception {
ServerSocket soc = new ServerSocket(5217);
ClientSockets = new Vector();
LoginNames = new Vector();
while (true) {
Socket CSoc = soc.accept();
AcceptClient obClient = new AcceptClient(CSoc);
}
}
public static void main(String args[]) throws Exception {
chatServer ob = new chatServer();
}
class AcceptClient extends Thread {
Socket ClientSocket;
DataInputStream din;
DataOutputStream dout;
AcceptClient(Socket CSoc) throws Exception {
ClientSocket = CSoc;
din = new DataInputStream(ClientSocket.getInputStream());
dout = new DataOutputStream(ClientSocket.getOutputStream());
String LoginName = din.readUTF();
System.out.println("User Logged In :" + LoginName);
LoginNames.add(LoginName);
ClientSockets.add(ClientSocket);
start();
}
public void run() {
while (true) {
try {
String msgFromClient = new String();
msgFromClient = din.readUTF();
StringTokenizer st = new StringTokenizer(msgFromClient);
String Sendto = st.nextToken();
String MsgType = st.nextToken();
int iCount = 0;
if (MsgType.equals("LOGOUT")) {
for (iCount = 0; iCount < LoginNames.size(); iCount++) {
if (LoginNames.elementAt(iCount).equals(Sendto)) {
LoginNames.removeElementAt(iCount);
ClientSockets.removeElementAt(iCount);
System.out.println("User " + Sendto + " Logged Out ...");
break;
}
}
} else {
String msg = "";
while (st.hasMoreTokens()) {
msg = msg + " " + st.nextToken();
}
for (iCount = 0; iCount < LoginNames.size(); iCount++) {
if (LoginNames.elementAt(iCount).equals(Sendto)) {
Socket tSoc = (Socket) ClientSockets.elementAt(iCount);
DataOutputStream tdout = new DataOutputStream(tSoc.getOutputStream());
tdout.writeUTF(msg);
break;
}
}
if (iCount == LoginNames.size()) {
dout.writeUTF("I am offline");
} else {
}
}
if (MsgType.equals("LOGOUT")) {
break;
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
}
Thanks in advance.

If you look at your client's constructor you'll see that it requires two arguments:
chatClient(String LoginName, String chatwith)
a login and with whom to chat.
I think you don't specify them so the following line throws an exception because there aren't any and args is empty:
chatClient Client1 = new chatClient(args[0],args[1]);

The java arguments you pass from the command line are actually an array of String. If you do not type anything into the command line (or the NetBeans equivalent you will get an ArrrayIndexOutOfBoundsException. Therefore you get an exception because you try to pass an array of strings into chatClient method without there actually being any arguments.

Java Transferring Byte arrays over socket corrupted data

I'm transferring Byte arrays of different kinds of files(.png, .txt, etc..) My socket starts sending the data and client starts receiving it. For some reason .pngs doesen't look same as they do on the server side. (Sometimes it says image is unreadable, sometimes only some parts of image are shown.. etc)? I'm wondering how could I make it so that the sent data would actually be the same as the sent data? Any suggestions what I'm doing wrong? (Note! If .png file has alpha channel, image seems always to be completely unreadable.)
Client side of the data transfer:
try
{
sInput = new ObjectInputStream(socket.getInputStream());
Input = socket.getInputStream();
}
catch (IOException eIO) {
System.out.println("Exception creating new Input/output Streams: " + eIO);
return false;
}
.
.
.
LoadCache[] filedata = (LoadCache[]) sInput.readObject(); //This contains the path and size of file
while(number < filedata.length){
byte[] mybytearray = new byte[(int) LoadCache.getSize(filedata[number])];
String result = Reader.UpdateCache(LoadCache.getPath(filedata[number]));
number++;
if(result != "skip" && result != "Stop"){
BufferedOutputStream Bos = new BufferedOutputStream(new FileOutputStream(result));
int BytesRead = Input.read(mybytearray, 0, mybytearray.length);
Bos.write(mybytearray, 0, BytesRead);
Bos.close();
}
}
Server side of the data transfer:
Socket socket;
ObjectInputStream sInput;
ObjectOutputStream sOutput;
OutputStream Output;
BufferedInputStream buffIn;
.
.
.
try{
sOutput = new ObjectOutputStream(socket.getOutputStream());
sInput = new ObjectInputStream(socket.getInputStream());
Output = socket.getOutputStream();
} catch (Exception e){
System.out.println("Couldn't create Input/Output streams");
}
.
.
.
File[] Data = Reader.getFiles(Action.getString(Incomingdata.getAction(datain)));
LoadCache LoadedCache[] = new LoadCache[Data.length];
for(int i = 0; i<Data.length; i++){
Path filePath = Paths.get(Data[i].getPath());
Path relativePath = base.relativize(filePath); //= filePath - base (so to say)
LoadedCache[i] = new LoadCache(relativePath.toString(), Data[i].length());
}
System.out.println(LoadedCache.length);
try {
sOutput.writeObject(LoadedCache);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
for(File file : Data){
try {
if(file.isFile()){
byte[] bytearray = new byte[(int) file.length()];
buffIn = new BufferedInputStream(new FileInputStream(file));
buffIn.read(bytearray, 0, bytearray.length);
Output.write(bytearray, 0, bytearray.length);
Output.flush();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try {
buffIn.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Also! Now (I'm not quite sure anymore if I got this earlier) Client gives me java.util.zip.ZipException: incorrect header check -Exception (And none of the files is zipped)
Something Runnable:
Public class Client {
private ObjectInputStream sInput; // to read from the socket
private static ObjectOutputStream sOutput; // to write on the socket
private static Socket socket;
public static Client client;
public static Player player;
public static boolean loadingFiles;
String server;
int port;
boolean connected;
Client(String server, int port) {
this.server = server;
this.port = port;
this.connected = true;
}
public static boolean isConnected(Client client){
return client.connected;
}
private void disconnect() {
try {
if(sInput != null) sInput.close();
}
catch(Exception e) {} // not much else I can do
try {
if(sOutput != null) sOutput.close();
}
catch(Exception e) {} // not much else I can do
try{
if(socket != null) socket.close();
}
catch(Exception e) {} // not much else I can do
}
public boolean start() {
// try to connect to the server
try {
socket = new Socket(server, port);
}
// if it failed we catch the exception
catch(Exception ec) {
System.out.println("Error connecting to server: " + ec);
return false;
}
System.out.println("Connection accepted " + socket.getInetAddress() + ":" + socket.getPort());
/* Creating Data Streams */
try
{
sOutput = new ObjectOutputStream(socket.getOutputStream());
sInput = new ObjectInputStream(socket.getInputStream());
}
catch (IOException eIO) {
System.out.println("Exception creating streams: " + eIO);
return false;
}
// creates the Thread to listen from the server
new ListenFromServer().start();
String Cache;
if(Reader.ReadCache(Frame.drive +"//FM_Cache/version") == "WeHadToMakeNewFile"){ //If we don't have that file. We create it, but now it's empty.
Cache = "New";
}
else{ //If we do have cache and it has "version" we send our version to server.
Cache = Reader.ReadCache(Frame.drive +"FM_Cache/version");
}
send(new Incomingdata("", "", new Action(0, Cache, 0, 0)));
// success we inform the caller that it worked
return true;
}
public static void Connect() {
// default values
int portNumber = 16304;
String serverAddress = "0.0.0.0"; //I'm using my own ip here..
// create the Client object
client = new Client(serverAddress, portNumber);
// test if we can start the connection to the Server
if(client.start()){
client.connected = true;
}
}
public static void Disconnect(Client client) {
client.connected = false;
client.disconnect();
}
class ListenFromServer extends Thread {
public void run() {
loadingFiles = true;
while(true) {
try {
int number = 0;
LoadCache[] filedata = (LoadCache[]) sInput.readObject();
while(number < filedata.length){
byte[] mybytearray = new byte[(int) LoadCache.getSize(filedata[number])];
String result = Reader.UpdateCache(LoadCache.getPath(filedata[number]));
number++;
if(result != "skip" && result != "Stop"){
BufferedOutputStream Bos = new BufferedOutputStream(new FileOutputStream(result));
int BytesRead = sInput.read(mybytearray, 0, mybytearray.length);
Bos.write(mybytearray, 0, BytesRead);
Bos.close();
}
}
System.out.println("Cache has been patched succesfully!");
Client.loadingFiles = false;
}catch(EOFException e){
System.out.println("Problem reading the data streams! " +e);
break;
}
catch(IOException e) {
System.out.println(e);
break;
}
catch(ClassNotFoundException e2) {
}
}
}
}
public static void send(Incomingdata incomingdata) {
try {
sOutput.writeObject(incomingdata);
}
catch(IOException e) {
System.out.println("Exception writing to server: " + e);
}
}
}
Incomingdata:
package com.connection;
import com.connection.Action;
public class Incomingdata implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = -1309997274550304156L;
private String Username, Password;
private Action action;
public Incomingdata(String Username, String Password, Action action){
this.Username = Username;
this.action = action;
this.Password = Password;
}
public static String getUsername(Incomingdata Incomingdata){
return Incomingdata.Username;
}
public static String getPassword(Incomingdata Incomingdata){
return Incomingdata.Password;
}
public static Action getAction(Incomingdata Incomingdata){
return Incomingdata.action;
}
}
LoadingCache:
package com.connection;
import java.io.Serializable;
public class LoadCache implements Serializable{
/**
*
*/
private static final long serialVersionUID = 7267682639705707967L;
String path;
long size;
public LoadCache(String path, long size){
this.path = path;
this.size = size;
}
public static long getSize(LoadCache cache) {
return cache.size;
}
public static String getPath(LoadCache filedata) {
return filedata.path;
}
}
Action.java:
package com.connection;
import com.connection.Action;
public class Action implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 4389420849399916526L;
int type, x, y;
String string;
public Action(int type, String string, int x, int y){
this.type = type;
this.string = string;
this.x = x;
this.y = y;
}
public static int getType(Action action) {
return action.type;
}
public static String getString(Action action) {
return action.string;
}
public static int getX(Action action) {
return action.x;
}
public static int getY(Action action) {
return action.y;
}
}
And Reader for Client. This should be the last class you need to run the client.
package com.game.loader;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import com.connection.Client;
import com.game.Frame;
import com.game.menu.GameMenu;
public class Reader {
public static String ReadCache(String string) {
int CurrentLine = 0;
String returnement = "";
try {
BufferedReader Reader = new BufferedReader(new FileReader(new File(string)));
for(String line = Reader.readLine(); line != null; line = Reader.readLine()){
if(CurrentLine == 0){
returnement = line;
}
CurrentLine++;
}
} catch (FileNotFoundException e) {
new File(Frame.drive +"//FM_Cache").mkdirs();
return "WeHadToMakeNewFile";
} catch (IOException e) {
e.printStackTrace();
}
return returnement;
}
public static String UpdateCache(String path) {
String[] pieces = path.split("/");
String returnement = "skip";
System.out.println(Frame.drive + "//FM_Cache/" + path);
if(new File(Frame.drive +"//FM_Cache/" +path).exists()){
returnement = (Frame.drive +"//FM_Cache/" +path);
}
else{ //If file doesen't exit we make one and parent folders.
File file = new File(Frame.drive +"//FM_Cache/" +path);
file.getParentFile().mkdirs();
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
returnement = (Frame.drive +"//FM_Cache/" +path);
}
return returnement;
}
}
Runnable server:
package com.server;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.ServerSocket;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import org.apache.commons.io.IOUtils;
import com.connection.Action;
import com.connection.Incomingdata;
import com.connection.LoadCache;
import com.game.loader.Reader;
import com.game.player.Player;
public class Server {
//Every connection got their own unique id
private static int uniqueId;
//List all the clients
private static ArrayList<ClientThread> al;
private static boolean running = false;
#SuppressWarnings("unused")
private SimpleDateFormat sdf;
final Path base = Paths.get("Data", "Cache");
public Server(int port) {
sdf = new SimpleDateFormat("HH:mm:ss");
al = new ArrayList<ClientThread>();
}
public void start() {
running = true;
try {
//Server socket
ServerSocket serverSocket = new ServerSocket(Screen.portnumber);
System.out.println("Server is running and waiting for Clients to connect.");
while(running){
Socket socket = serverSocket.accept();
if(!running){ //this will make server running stop.
System.out.println("Closing the server..");
break;
}
ClientThread t = new ClientThread(socket);
al.add(t); //saving new client to our arraylist.
t.run();
}
try{
serverSocket.close();
for(int i = 0; i< al.size(); i++){//We forget about all the clients.
//Maybe also save all the data here?
ClientThread tc = al.get(i);
try{
tc.sInput.close();
tc.sOutput.close();
tc.socket.close();
}
catch(IOException ioE){}
}
} catch(Exception e){e.printStackTrace();}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close() {
running = false;
try {
new Socket("localhost", Screen.portnumber);
} catch (Exception e) { System.out.println("Can't disconnect.."); }
}
synchronized void remove(int id) {
// scan the array list until we find the Id
for(int i = 0; i < al.size(); ++i) {
ClientThread ct = al.get(i);
// found it
if(ct.id == id) {
al.remove(i);
return;
}
}
}
public static boolean isRunning(){
return running;
}
class ClientThread extends Thread {
//The socket where to listen/talk
Socket socket;
ObjectInputStream sInput;
ObjectOutputStream sOutput;
BufferedInputStream buffIn;
//my unique id (easier for deconnection)
int id;
//Objects that we will be receiving
Incomingdata datain;
//the date we connect
String date;
Player player;
boolean Connected = false;
//Constructor
ClientThread(Socket socket){
id = uniqueId++;
this.socket = socket;
try{
sOutput = new ObjectOutputStream(socket.getOutputStream());
sInput = new ObjectInputStream(socket.getInputStream());
} catch (Exception e){
System.out.println("Couldn't create Input/Output streams");
}
date = new Date().toString();
}
// what will run forever
public void run() {
// to loop until LOGOUT
Connected = true;
while(Connected) {
try {
datain = (Incomingdata) sInput.readObject();
}
catch (IOException e) {
System.out.println("Exception reading Streams: " + e);
break;
}
catch(ClassNotFoundException e2) {
break;
}
if(!Incomingdata.getUsername(datain).isEmpty()){
switch(Action.getType(Incomingdata.getAction(datain))) { //CHANGE!!
case 0://Log in/off
System.out.println(Incomingdata.getUsername(datain) +", " +Incomingdata.getPassword(datain) + " trying to connect.");
if(Player.getPassword(Reader.ReadPlayerData("Data/Players/" +Incomingdata.getUsername(datain) +".txt")) == Incomingdata.getPassword(datain)){
player = Reader.ReadPlayerData("Data/Players/" +Incomingdata.getUsername(datain) +".txt");
System.out.println(Player.getUsername(player) +"Just connected!");
Player.isOnline(player);
}
break;
case 1://Talk
System.out.println(Incomingdata.getUsername(datain) + ": " +Action.getString(Incomingdata.getAction(datain)));
break;
case 2://Move
break;
}
}
else if(Action.getString(Incomingdata.getAction(datain)) != null){
File[] Data = Reader.getFiles(Action.getString(Incomingdata.getAction(datain)));
LoadCache LoadedCache[] = new LoadCache[Data.length];
for(int i = 0; i<Data.length; i++){
Path filePath = Paths.get(Data[i].getPath());
Path relativePath = base.relativize(filePath); //= filePath - base (so to say)
LoadedCache[i] = new LoadCache(relativePath.toString(), Data[i].length());
}
System.out.println(LoadedCache.length);
try {
sOutput.writeObject(LoadedCache);
sOutput.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
for(File file : Data){
try {
if(file.isFile()){
byte[] bytearray = new byte[(int) file.length()];
buffIn = new BufferedInputStream(new FileInputStream(file));
buffIn.read(bytearray, 0, bytearray.length);
sOutput.write(bytearray, 0, bytearray.length);
sOutput.flush();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try {
buffIn.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("Cache updated!");
}
}
// remove myself from the arrayList containing the list of the
System.out.println(Player.getUsername(player) +", " +Player.getPassword(player) +" disconnected.");
remove(id);
close();
}
// try to close everything
private void close() {
// try to close the connection
try {
if(sOutput != null) sOutput.close();
}
catch(Exception e) {}
try {
if(sInput != null) sInput.close();
}
catch(Exception e) {};
try {
if(socket != null) socket.close();
}
catch (Exception e) {}
}
}
}
Reader.java for server:
package com.game.loader;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FilenameFilter;
import java.io.IOException;
import org.apache.commons.io.filefilter.FileFileFilter;
import com.game.player.CharacterClass;
import com.game.player.Equipment;
import com.game.player.Friends;
import com.game.player.Inventory;
import com.game.player.Orbs;
import com.game.player.Player;
import com.game.player.Quest;
import com.game.world.Tile;
public class Reader {
public static Player temporary;
static int stage = 0;
private static int count = 0;
private static int totalfolders = 0;
private static File[] files = new File[NumberOfFiles("Data/Cache/")];
public static Player ReadPlayerData(String string) {
Player player = null;
int CurrentLine = 0;
String[] All = new String[100]; //This may need to be extended.
try {
BufferedReader Reader = new BufferedReader(new FileReader(new File(string)));
for(String line = Reader.readLine(); line != null; line = Reader.readLine()){
All[CurrentLine] = line;
CurrentLine++;
}
} catch (FileNotFoundException e) {
System.out.println("Someone is trying to log in using wrong username.");
} catch (IOException e) {
e.printStackTrace();
}
player = new Player(string, All[0], new Tile(Integer.parseInt(All[1].split(", ")[0]), Integer.parseInt(All[1].split(", ")[1]), Integer.parseInt(All[1].split(", ")[2])),
Integer.parseInt(All[2]), Integer.parseInt(All[3]), Integer.parseInt(All[4]), new CharacterClass(All[5]), new Orbs(All[6].split(", ")), null, new Inventory(All[8].split(", ")),
null, new Equipment(All[10].split(", ")), new Friends(All[11].split(", ")), /* All[12] = guild,*/ Integer.parseInt(All[13]), true, false, null, null, Integer.parseInt(All[18]), /*All[19] = StartDate,*/ All[20]);
temporary = player;
return player;
}
public static boolean CacheReader(String string) {
File[] all = new File(string).listFiles(); //We list all the files from path
int folders = 0;
for(int i = 0; i < all.length; i++){
if(!all[i].isDirectory()) { //folders are not added to this list. :)
System.out.println("((i = " +i +") - (folders = " +folders +")) + (stage = " +stage +") = " +(i-folders+stage));
files[i-folders+stage] = all[i];
}
else{
folders++;
totalfolders++;
}
}
stage += all.length-folders; //We add number of files from every directory to stage.
for(int i = 0; i < all.length; i++){ //Then we seek for all the sub-directories
if(all[i].isDirectory()){
CacheReader(all[i].getPath()); //and add all the files from sub-directories to out file list
}
}
return true;
}
public static File[] getFiles(String string) {
if(string == "New"){
}
return files;
}
public static int NumberOfFiles(String string) {
File[] filenames;
filenames = new File(string).listFiles();
count += filenames.length; //We add all the files from the File(string) Note!: Also folders
for(int i = 0; i < filenames.length; i++){
if(filenames[i].isDirectory()){
NumberOfFiles(filenames[i].getPath());
count--;
}
}
return count;
}
}
Umm.. I think you can remove everything related to player, since it's not part of cache update system.. also there are some unused imports in those, I didn't remove all of them. Most of TextArea.Addline();s I changed to System.out.println(); if you find one, you can aswell replace it with System.out.println(); or if you don't need it you can remove it. What ever.. I just would like to find an answer..

try to write the byte array to the ObjectOutputStream as an object:
final byte[] bytearray = new byte[(int) file.length()];
buffIn = new BufferedInputStream(new FileInputStream(file));
buffIn.read(bytearray, 0, bytearray.length);
sOutput.writeObject(bytearray);
And to read it as an Object:
final BufferedOutputStream Bos =
new BufferedOutputStream(new FileOutputStream(result));
byte[] mybytearray = (byte[])sInput.readObject();
Bos.write(mybytearray, 0, BytesRead);
I hope it helps.

Don't use multiple streams to read from the same socket, or write to it either. Use the object streams for everything.
Your copy loops are incorrect, because they aren't loops. You can't assume that read() fills the buffer. The canonical stream copy loop in Java is like so:
int count;
byte[] buffer = new byte[8192]; // or more, code works with any size >= 1
while ((count = in.read(buffer)) > 0)
{
out.write(buffer, 0, count);
}

Program for file transfer in java using sockets

I have written a java code to transfer files from one server to another using the concept of socket programming. I got the codes from another java forum that meet my requirements. The program is said to transfer large sized files (like .mkv , .mprg movies) from one machine to another and can be used to transfer files of all formats. But after running the codes I found that the program is not able to transfer large sized files such as movies and even pdf of sizes 80mb or 111mb. The program has used bytebuffer but still error occurs. The codes are as follows (I got them from this site http://www.coderpanda.com/java-socket-programming-transferring-large-sized-files-through-socket/)
ClientMain.java
import java.io.IOException;
import java.net.Socket;
public class ClientMain
{
private DirectoryTxr transmitter = null;
Socket clientSocket = null;
private boolean connectedStatus = false;
private String ipAddress;
String srcPath = null;
String dstPath = "";
public ClientMain()
{
}
public void setIpAddress(String ip)
{
this.ipAddress = ip;
}
public void setSrcPath(String path)
{
this.srcPath = path;
}
public void setDstPath(String path)
{
this.dstPath = path;
}
private void createConnection()
{
Runnable connectRunnable = new Runnable()
{
public void run()
{
while (!connectedStatus)
{
try
{
clientSocket = new Socket(ipAddress, 22);
connectedStatus = true;
transmitter = new DirectoryTxr(clientSocket, srcPath, dstPath);
}
catch (IOException io)
{
io.printStackTrace();
}
}
}
};
Thread connectionThread = new Thread(connectRunnable);
connectionThread.start();
}
public static void main(String[] args)
{
ClientMain main = new ClientMain();
main.setIpAddress("localHost");
main.setSrcPath("C:/Transfer/");
main.setDstPath("C:/Receive");
main.createConnection();
}
}
DirectoryTxr.java
import java.io.*;
import java.net.Socket;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class DirectoryTxr
{
Socket clientSocket = null;
String srcDir = null;
String dstDir = null;
byte[] readBuffer = new byte[1024];
private InputStream inStream = null;
private OutputStream outStream = null;
int state = 0;
final int permissionReqState = 1;
final int initialState = 0;
final int dirHeaderSendState = 2;
final int fileHeaderSendState = 3;
final int fileSendState = 4;
final int fileFinishedState = 5;
private boolean isLive = false;
private int numFiles = 0;
private int filePointer = 0;
String request = "May I send?";
String respServer = "Yes,You can";
String dirResponse = "Directory created...Please send files";
String fileHeaderRecvd = "File header received ...Send File";
String fileReceived = "File Received";
String dirFailedResponse = "Failed";
File[] opFileList = null;
public DirectoryTxr(Socket clientSocket, String srcDir, String dstDir)
{
try
{
this.clientSocket = clientSocket;
inStream = clientSocket.getInputStream();
outStream = clientSocket.getOutputStream();
isLive = true;
this.srcDir = srcDir;
this.dstDir = dstDir;
state = initialState;
readResponse();
sendMessage(request);
state = permissionReqState;
}
catch (IOException io)
{
io.printStackTrace();
}
}
private void sendMessage(String message)
{
try
{
sendBytes(request.getBytes("UTF-8"));
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
}
private void readResponse()
{
Runnable readRunnable = new Runnable()
{
public void run()
{
while (isLive)
{
try
{
int num = inStream.read(readBuffer);
if (num > 0)
{
byte[] tempArray = new byte[num];
System.arraycopy(readBuffer, 0, tempArray, 0, num);
processBytes(tempArray);
}
}
catch (SocketException se)
{
System.exit(0);
}
catch (IOException io)
{
io.printStackTrace();
isLive = false;
}
}
}
};
Thread readThread = new Thread(readRunnable);
readThread.start();
}
private void sendDirectoryHeader()
{
File file = new File(srcDir);
if (file.isDirectory())
{
try
{
String[] childFiles = file.list();
numFiles = childFiles.length;
String dirHeader = "$" + dstDir + "#" + numFiles + "&";
sendBytes(dirHeader.getBytes("UTF-8"));
}
catch (UnsupportedEncodingException en)
{
en.printStackTrace();
}
}
else
{
System.out.println(srcDir + " is not a valid directory");
}
}
private void sendFile(String dirName)
{
File file = new File(dirName);
if (!file.isDirectory())
{
try
{
int len = (int) file.length();
int buffSize = len / 8;
RandomAccessFile raf = new RandomAccessFile(file, "rw");
FileChannel channel = raf.getChannel();
int numRead = 0;
while (numRead >= 0)
{
ByteBuffer buf = ByteBuffer.allocate(1024 * 100000);
numRead = channel.read(buf);
if (numRead > 0)
{
byte[] array = new byte[numRead];
System.arraycopy(buf.array(), 0, array, 0, numRead);
sendBytes(array);
}
}
System.out.println("Finished");
}
catch (IOException io)
{
io.printStackTrace();
}
}
}
private void sendHeader(String fileName)
{
try
{
File file = new File(fileName);
if (file.isDirectory())
return;
String header = "&" + fileName + "#" + file.length() + "*";
sendHeader(header);
sendBytes(header.getBytes("UTF-8"));
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
}
private void sendBytes(byte[] dataBytes)
{
synchronized (clientSocket)
{
if (outStream != null)
{
try
{
outStream.write(dataBytes);
outStream.flush();
}
catch (IOException io)
{
io.printStackTrace();
}
}
}
}
private void processBytes(byte[] data)
{
try
{
String parsedMessage = new String(data, "UTF-8");
System.out.println(parsedMessage);
setResponse(parsedMessage);
}
catch (UnsupportedEncodingException u)
{
u.printStackTrace();
}
}
private void setResponse(String message)
{
if (message.trim().equalsIgnoreCase(respServer) && state == permissionReqState)
{
state = dirHeaderSendState;
sendDirectoryHeader();
}
else if (message.trim().equalsIgnoreCase(dirResponse) && state == dirHeaderSendState)
{
state = fileHeaderSendState;
if (LocateDirectory())
{
createAndSendHeader();
}
else
{
System.out.println("Vacant or invalid directory");
}
}
else if (message.trim().equalsIgnoreCase(fileHeaderRecvd) && state == fileHeaderSendState)
{
state = fileSendState;
sendFile(opFileList[filePointer].toString());
state = fileFinishedState;
filePointer++;
}
else if (message.trim().equalsIgnoreCase(fileReceived) && state == fileFinishedState)
{
if (filePointer < numFiles)
{
createAndSendHeader();
}
System.out.println("Successfully sent");
}
else if (message.trim().equalsIgnoreCase(dirFailedResponse))
{
System.out.println("Going to exit....Error ");
}
else if (message.trim().equalsIgnoreCase("Thanks"))
{
System.out.println("All files were copied");
}
}
private void closeSocket()
{
try
{
clientSocket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
private boolean LocateDirectory()
{
boolean status = false;
File file = new File(srcDir);
if (file.isDirectory())
{
opFileList = file.listFiles();
numFiles = opFileList.length;
if (numFiles <= 0)
{
System.out.println("No files found");
}
else
{
status = true;
}
}
return status;
}
private void createAndSendHeader()
{
File opFile = opFileList[filePointer];
String header = "&" + opFile.getName() + "#" + opFile.length() + "*";
try
{
state = fileHeaderSendState;
sendBytes(header.getBytes("UTF-8"));
}
catch (UnsupportedEncodingException e)
{
}
}
private void sendListFiles()
{
createAndSendHeader();
}
}
ServerMain.java
public class ServerMain {
public ServerMain() {
}
public static void main(String[] args) {
DirectoryRcr dirRcr = new DirectoryRcr();
}
}
DirectoryRcr.java
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
public class DirectoryRcr
{
String request = "May I send?";
String respServer = "Yes,You can";
String dirResponse = "Directory created...Please send files";
String dirFailedResponse = "Failed";
String fileHeaderRecvd = "File header received ...Send File";
String fileReceived = "File Received";
Socket socket = null;
OutputStream ioStream = null;
InputStream inStream = null;
boolean isLive = false;
int state = 0;
final int initialState = 0;
final int dirHeaderWait = 1;
final int dirWaitState = 2;
final int fileHeaderWaitState = 3;
final int fileContentWaitState = 4;
final int fileReceiveState = 5;
final int fileReceivedState = 6;
final int finalState = 7;
byte[] readBuffer = new byte[1024 * 100000];
long fileSize = 0;
String dir = "";
FileOutputStream foStream = null;
int fileCount = 0;
File dstFile = null;
public DirectoryRcr()
{
acceptConnection();
}
private void acceptConnection()
{
try
{
ServerSocket server = new ServerSocket(22);
socket = server.accept();
isLive = true;
ioStream = socket.getOutputStream();
inStream = socket.getInputStream();
state = initialState;
startReadThread();
}
catch (IOException io)
{
io.printStackTrace();
}
}
private void startReadThread()
{
Thread readRunnable = new Thread()
{
public void run()
{
while (isLive)
{
try
{
int num = inStream.read(readBuffer);
if (num > 0)
{
byte[] tempArray = new byte[num];
System.arraycopy(readBuffer, 0, tempArray, 0, num);
processBytes(tempArray);
}
sleep(100);
} catch (SocketException s)
{
}
catch (IOException e)
{
e.printStackTrace();
}
catch (InterruptedException i)
{
i.printStackTrace();
}
}
}
};
Thread readThread = new Thread(readRunnable);
readThread.start();
}
private void processBytes(byte[] buff) throws InterruptedException
{
if (state == fileReceiveState || state == fileContentWaitState)
{
if (state == fileContentWaitState)
state = fileReceiveState;
fileSize = fileSize - buff.length;
writeToFile(buff);
if (fileSize == 0)
{
state = fileReceivedState;
try
{
foStream.close();
}
catch (IOException io)
{
io.printStackTrace();
}
System.out.println("Received " + dstFile.getName());
sendResponse(fileReceived);
fileCount--;
if (fileCount != 0)
{
state = fileHeaderWaitState;
}
else
{
System.out.println("Finished");
state = finalState;
sendResponse("Thanks");
Thread.sleep(2000);
System.exit(0);
}
System.out.println("Received");
}
}
else
{
parseToUTF(buff);
}
}
private void parseToUTF(byte[] data)
{
try
{
String parsedMessage = new String(data, "UTF-8");
System.out.println(parsedMessage);
setResponse(parsedMessage);
}
catch (UnsupportedEncodingException u) {
u.printStackTrace();
}
}
private void setResponse(String message)
{
if (message.trim().equalsIgnoreCase(request) && state == initialState)
{
sendResponse(respServer);
state = dirHeaderWait;
}
else if (state == dirHeaderWait)
{
if (createDirectory(message))
{
sendResponse(dirResponse);
state = fileHeaderWaitState;
}
else
{
sendResponse(dirFailedResponse);
System.out.println("Error occurred...Going to exit");
System.exit(0);
}
} else if (state == fileHeaderWaitState)
{
createFile(message);
state = fileContentWaitState;
sendResponse(fileHeaderRecvd);
}
else if (message.trim().equalsIgnoreCase(dirFailedResponse))
{
System.out.println("Error occurred ....");
System.exit(0);
}
}
private void sendResponse(String resp)
{
try
{
sendBytes(resp.getBytes("UTF-8"));
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
}
private boolean createDirectory(String dirName)
{
boolean status = false;
dir = dirName.substring(dirName.indexOf("$") + 1, dirName.indexOf("#"));
fileCount = Integer.parseInt(dirName.substring(dirName.indexOf("#") + 1, dirName.indexOf("&")));
if (new File(dir).mkdir())
{
status = true;
System.out.println("Successfully created directory " + dirName);
}
else if (new File(dir).mkdirs())
{
status = true;
System.out.println("Directories were created " + dirName);
}
else if (new File(dir).exists())
{
status = true;
System.out.println("Directory exists" + dirName);
}
else
{
System.out.println("Could not create directory " + dirName);
status = false;
}
return status;
}
private void createFile(String fileName)
{
String file = fileName.substring(fileName.indexOf("&") + 1, fileName.indexOf("#"));
String lengthFile = fileName.substring(fileName.indexOf("#") + 1, fileName.indexOf("*"));
fileSize = Integer.parseInt(lengthFile);
dstFile = new File(dir + "/" + file);
try
{
foStream = new FileOutputStream(dstFile);
System.out.println("Starting to receive " + dstFile.getName());
}
catch (FileNotFoundException fn)
{
fn.printStackTrace();
}
}
private void writeToFile(byte[] buff)
{
try
{
foStream.write(buff);
}
catch (IOException io)
{
io.printStackTrace();
}
}
private void sendBytes(byte[] dataBytes)
{
synchronized (socket)
{
if (ioStream != null)
{
try
{
ioStream.write(dataBytes);
}
catch (IOException io)
{
io.printStackTrace();
}
}
}
}
}
Note that:-
ClientMain.java and DirectoryTxr.java are the two classes under client application.
ServerMain.java and DirectoryRcr.java are the two classes under Server application.
run the ClientMain.java and ServerMain.java simultaneously
Also specify the source directory, destination directory and host address of the machine in which server is running in the ClientMain.java(as per your computer). Here we are not specifying source file ,instead a source directory or folder is specifying.So the entire files of source directory will be transferred.
I would really appreciate if someone can help me with the problem.

You can check this code. This code can send files till 2GB of file size. Checked and working. Basically what I do here is first I send the file size and file name in an object then I start sending the file. First of all let me show you the class whose object will carry the File's details and send it to Receiver.
FileTransfer Class:
public class FileDetails implements Serializable {
String name;
long size;
public void setDetails(String name, long size) {
this.name = name;
this.size = size;
}
public String getName() {
return name;
}
public long getSize() {
return size;
}
}
Sender:
ServerSocket sendServer = null;
Socket sendSocket;
FileDetails details;
byte data[];
try {
File file = new File("File Url");
// Getting file name and size
if (file.length() > Integer.MAX_VALUE) {
System.out.println("File size exceeds 2 GB");
} else {
sendServer = new ServerSocket(5050);
System.out.println("Waiting for Client...");
sendSocket = sendServer.accept();
// File Object for accesing file Details
System.out.println("Connected to Client...");
data = new byte[2048]; // Here you can increase the size also which will send it faster
details = new FileDetails();
details.setDetails(file.getName(), file.length());
// Sending file details to the client
System.out.println("Sending file details...");
ObjectOutputStream sendDetails = new ObjectOutputStream(sendSocket.getOutputStream());
sendDetails.writeObject(details);
sendDetails.flush();
// Sending File Data
System.out.println("Sending file data...");
FileInputStream fileStream = new FileInputStream(file);
BufferedInputStream fileBuffer = new BufferedInputStream(fileStream);
OutputStream out = sendSocket.getOutputStream();
int count;
while ((count = fileBuffer.read(data)) > 0) {
System.out.println("Data Sent : " + count);
out.write(data, 0, count);
out.flush();
}
out.close();
fileBuffer.close();
fileStream.close();
}
} catch (Exception e) {
System.out.println("Error : " + e.toString());
}
Receiver's code :
int port = 5050;
try {
System.out.println("Connecting to Server...");
Socket receiveSocket = new Socket("IP of Server", port);
System.out.println("Connected to Server...");
// Getting file details
System.out.println("Getting details from Server...");
ObjectInputStream getDetails = new ObjectInputStream(receiveSocket.getInputStream());
FileDetails details = (FileDetails) getDetails.readObject();
System.out.println("Now receiving file...");
// Storing file name and sizes
String fileName = details.getName();
System.out.println("File Name : " + fileName);
byte data[] = new byte[2048]; // Here you can increase the size also which will receive it faster
FileOutputStream fileOut = new FileOutputStream("D:\\" + fileName);
InputStream fileIn = receiveSocket.getInputStream();
BufferedOutputStream fileBuffer = new BufferedOutputStream(fileOut);
int count;
int sum = 0;
while ((count = fileIn.read(data)) > 0) {
sum += count;
fileBuffer.write(data, 0, count);
System.out.println("Data received : " + sum);
fileBuffer.flush();
}
System.out.println("File Received...");
fileBuffer.close();
fileIn.close();
} catch (Exception e) {
System.out.println("Error : " + e.toString());
}
Hope this helps you.

You don't need all this. The canonical way to copy a stream in Java is as follows. It works for any buffer size greater than zero. I generally use 8192. There is certainly no necessity to read entire files into memory. It just wastes time and space.
while ((count = in.read(buffer)) > 0)
{
out.write(buffer, 0, count);
}
If you know the size in advance and need to keep the socket open for another transfer:
while (total < length && (count = in.read(buffer, 0, length-total > buffer.length ? buffer.length : (int)(length-total))) > 0)
{
out.write(buffer, 0, count);
total += count;
}
where total is a long initialized to zero before this loop, and length is the length you know in advance.

Java chat strange bug [duplicate]

This question already exists:
Scanner issue when using nextLine after nextXXX [duplicate]
Closed 9 years ago.
I am trying to create a java chat and I got this bug: When I use name = scanner.nextLine() my program works apparently fine (but it's not reading any name, if I use System.out.println(name) I get newline), and when I don't use it my pg automaticly connects to server with no name. Can anyone tell me why it;s happening this?
import java.net.*;
import java.util.*;
import java.io.*;
class Cient
{
static String name;
public static void main(String[] args) throws Exception
{
Scanner scanner = new Scanner(System.in);
System.out.print("Adresa serverului si portul : ");//server adress and port
Socket cs = new Socket( scanner.next(), scanner.nextInt() );
DataOutputStream os = new DataOutputStream( cs.getOutputStream());
final DataInputStream is = new DataInputStream( cs.getInputStream());
String st = "";
System.out.println("Va rugam sa va introduceti numele");//get name
name = scanner.nextLine();
Thread T= new Thread(new Runnable()
{
public void run() {
while (true)
{
String s = "";
try
{
s = is.readUTF();
System.out.println(s);
if(s.equals("Intrerupem conexiunea .... Pa!"))//close connexion
{
return;
}
} catch (IOException ex)
{
}
}
}
});
T.start();
while (true)
{
st = scanner.nextLine();
os.writeUTF(st);
if(st.equals("QUIT") || st.equals("EXIT"))
{
return;//stop reading
}
}
}
}
Here is the Server Class, but I dont believe that's important:
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.Vector;
public class MyServer
{
Scanner scanner;
Vector<String> users = new Vector<String>();
Vector<HandleClient> clients = new Vector<HandleClient>();
String disconnectedUser = "InvalidUser";//String care imi spune daca un client s-a razgandit la conectare
int PORT;
public Vector<String> getUserList()
{
return users;
}
public void process() throws Exception
{
scanner = new Scanner(System.in);
System.out.println("PORT: ");
PORT = scanner.nextInt();
ServerSocket server = new ServerSocket(PORT);
System.out.println("Server Online...");
while(true)
{
Socket client = server.accept();
HandleClient c = new HandleClient(client);
if(!(c.userName().equals(disconnectedUser)))
{
clients.add(c);
users.add(c.userName());
}
}
}
public static void main(String ... args) throws Exception
{
new MyServer().process();
}
public void broadcast(String user, String message)throws Exception
{
for (HandleClient c : clients)
if (!(c.userName().equals(user)))
{
c.sendMessage(user,message);
}
}
public void twoUsersBroadcast(String fromUser,String toUser, String msg)throws Exception
{
for(HandleClient c : clients)
{
String a = (String) c.userName();
if(a.equals(toUser))
{
c.sendMessage(fromUser,msg);
return ;
}
}
}
public void changeUserName(String actualName,String newName)
{
int i = 0;
for(HandleClient c: clients)
{
if(c.userName().equals(actualName))
{
c.setUserName(newName);
users.set(i,newName);
}
i++;
}
}
boolean validUserName(String name)
{
for(String c : users)
{
if(c.equals(name))
{
return false;
}
}
return true;
}
class HandleClient extends Thread
{
String name = "";
DataInputStream input;
DataOutputStream output;
public String userName()
{
return name;
}
public void setUserName(String name)
{
this.name = name;
}
public void writeError(String message)
{
try
{
output.writeUTF("EROARE: " + message);
}
catch (IOException e)
{
System.out.print(e.getMessage());
}
}
public HandleClient(Socket client)throws Exception
{
input = new DataInputStream(client.getInputStream());
output= new DataOutputStream(client.getOutputStream());
boolean ok = true;
while(ok == true)
{
name = input.readUTF();
if(name.equals("EXIT"))
{
ok = false;
output.writeUTF("Intrerupem conexiunea .... Pa!");
name = "InvalidUser";//User-ul a renuntat la conexiune
}
else
{
if(validUserName(name) == true)
{
ok = false;
}
else
{
output.writeUTF("Numele este deja folosit. Va rugam sa introducet un alt nume sau EXIT in care doriti sa nu va mai conectati");
}
}
}
if("InvalidUser".equals(name))
{
return;
}
start();
}
public void sendMessage(String username,String msg)throws Exception
{
output.writeUTF( username + ": " + msg);
}
public void run()
{
String line;
try
{
boolean ok = true;
output.writeUTF("Introduceti:");
output.writeUTF("LIST pentru a vedea lista de utilizatori");
output.writeUTF("MSG pentru a transmite un mesaj unui anumit utilizator");
output.writeUTF("BCAST pentru a transmite un mesaj tuturor utilizatorilor");
output.writeUTF("NICK pentru a va schimba numele");
output.writeUTF("QUIT pentru a va deconecta de la server");
while(ok == true)
{
line = input.readUTF();
switch(line)
{
case "LIST":
{
Vector<String> users = getUserList();
output.writeUTF("Lista user-ilor este:");
for(String c : users)
{
output.writeUTF(c);
}
break;
}
case "MSG":
{
output.writeUTF("Introduceti numele persoanei careia doriti sa-i trimiteti mesajul");
line = input.readUTF();
if(validUserName(line) == true)
{
writeError("Numele persoanei nu exista");
break;
}
else
{
if(name.equals(line))
{
writeError("Selectati alt user");
break;
}
else
{
output.writeUTF("Introduceti mesajul pe care il aveti de transmis");
String message = input.readUTF();
if((validUserName(line) == false) && !(line.equals(name)))
{
twoUsersBroadcast(name,line,message);
}
break;
}
}
}
case "BCAST":
{
line = input.readUTF();
broadcast(name,line);
break;
}
case "NICK":
{
output.writeUTF("Va rugam sa va introduceti numele dorit");
line = input.readUTF();
if(validUserName(line))
{
changeUserName(name,line);
}
else
{
writeError("Invalid username");
}
break;
}
case "QUIT":
{
output.writeUTF("Intrerupem conexiunea .... Pa!");
clients.remove(this);
users.remove(name);
ok = true;
break;
}
default:
{
writeError("Comanda incorecta");
}
}
}
}
catch(Exception e)
{
System.err.println(e.getMessage());
clients.remove(this);
users.remove(name);
}
}
}
}

After this line:
Socket cs = new Socket( scanner.next(), scanner.nextInt() );
add:
scanner.nextLine();
So together, it would look like:
Socket cs = new Socket( scanner.next(), scanner.nextInt() );
scanner.nextLine();
This is done to swallow the dangling end of line (EOL) token that is not handled by next() or nextInt() and in fact is only handled by nextLine().