i have a server that is as follows:
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;
public class MyTcpServer {
static ServerSocket server = null;
static Socket connectionSocket = null;
static BufferedReader inFromClient = null;
static PrintWriter outToClient = null;
public static void initiateService() {
try {
server = new ServerSocket(1234);
System.out.println("TCPServer Waiting for client on port 1234");
} catch (IOException e) {
System.out
.println("There is some error!! Please try some other port!");
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void awaitRequest() throws IOException {
String instructionsToClient = null;
System.out.println("Service Ready");
while (true) {
connectionSocket = server.accept();
inFromClient = new BufferedReader(new InputStreamReader(
connectionSocket.getInputStream()));
outToClient = new PrintWriter(connectionSocket.getOutputStream(),
true);
String messageToClient;
String messageFromClient = null;
synchronized (Thread.currentThread()) {
System.out.println("Client:"
+ connectionSocket.getInetAddress()
+ " connected on port :"
+ connectionSocket.getLocalPort());
messageToClient = "Welcome!!!! You are now connected to our server!! We ensure a reliable service.\n"
+ "\n Your IP:"
+ connectionSocket.getInetAddress()
+ " \n"
+ connectionSocket.getLocalPort()
+ "::::MESSAGE FROM SERVER::::\n"
+ "Lets play Water jug puzzel!! You give me sizes of two water Jars\n"
+ "And a desired level to be achieved! Ill tell you whether the problem\n"
+ "is solvable or not!!\n"
+ "Comprande~?\n"
+ "Enter your choice Y/N \n"
+ "--------------------------";
synchronized (outToClient) {
outToClient.println(messageToClient);
outToClient.flush();
System.out.println("invite sent to the client!!");
}
synchronized (inFromClient) {
messageFromClient = inFromClient.readLine();
System.out.println("The user says: " + messageFromClient);
}
if (messageFromClient.equalsIgnoreCase("y")) {
messageToClient = "Wow!! awesome! Throw a challenge at me!"
+ "\nEnter Large jug volume,Small jug volume,Desired level in comma separated fashion"
+ "\nFor example (5,3,2)"
+ "\n--------------------------";
} else if (messageFromClient.equalsIgnoreCase("n")) {
messageToClient = "Great! we dont have a problem with you not playing the puzzel!"
+ "Do you wanna exit? press q and smack Enter key!"
+ "\n--------------------------";
} else {
messageToClient = "psssst!!! Wanna quit??"
+ "press q and smack Enter key!"
+ "\n--------------------------";
}
synchronized (messageToClient) {
outToClient.println(messageToClient);
outToClient.flush();
System.out.println("reply sent to the client!!");
}
messageFromClient = "";
synchronized (inFromClient) {
System.out.println("Entered");
messageFromClient = inFromClient.readLine();
System.out.println("The user says: " + messageFromClient);
if (messageFromClient.equalsIgnoreCase("q")) {
System.out.println("ui");
messageToClient = "Thank you!!"
+ "\n--------------------------";
} else {
StringTokenizer st = new StringTokenizer(messageFromClient,
",");
if (st.countTokens() != 3) {
messageToClient = "See! the input you gave has some problem!"
+ "\n you havent followed the instructions properly"
+ "\n Thank you!! Bye for now! come back later!"
+ "\n--------------------------";
} else {
messageToClient = "Thanks! i am solving it!"
+ "\n--------------------------";
}
}
}
synchronized (messageToClient) {
outToClient.println(messageToClient);
outToClient.flush();
System.out.println("problem answered sent to the client!!");
}
}
}
}
public static void main(String[] args) throws IOException {
initiateService();
awaitRequest();
}
}
and i have a client accessing this particular server!
import java.io.*;
import java.net.*;
public class MyTcpClient {
static Socket clientSocket;
static BufferedReader inFromUser;
static PrintWriter outToServer;
static BufferedReader inFromServer;
public static void main(String argv[]) throws Exception {
String FromServer;
String ToServer;
clientSocket = new Socket("localhost", 1234);
// for user to type messages in client mode
inFromUser = new BufferedReader(new InputStreamReader(System.in));
// client program uses this to write on the server
outToServer = new PrintWriter(clientSocket.getOutputStream(), true);
// servers talk back to the client
inFromServer = new BufferedReader(new InputStreamReader(
clientSocket.getInputStream()));
FromServer = "";
while (!FromServer.equals("--------------------------")) {
FromServer = readFromServer();
System.out.println(FromServer);
}
System.out.println("Enter choice!");
String choice = "";
choice = inFromUser.readLine();
System.out.println("" + choice);
synchronized (outToServer) {
outToServer.println(choice);
outToServer.flush();
}
FromServer = "";
while (!FromServer.equals("--------------------------")) {
FromServer = readFromServer();
System.out.println(FromServer);
}
choice = inFromUser.readLine();
System.out.println("" + choice);
synchronized (outToServer) {
outToServer.println(choice);
outToServer.flush();
}
FromServer = "";
while (!FromServer.equals("--------------------------")) {
FromServer = readFromServer();
System.out.println(FromServer);
}
}
static String readFromServer() throws IOException {
String response = inFromServer.readLine();
return response;
}
}
on a successful run the output at the server side is something like this:
TCPServer Waiting for client on port 1234
Service Ready
Client:/127.0.0.1 connected on port :1234
invite sent to the client!!
The user says: y
reply sent to the client!!
Entered
The user says: 5,3,2
and the output at client side is something like this:
Welcome!!!! You are now connected to our server!! We ensure a reliable service.
Your IP:/127.0.0.1
1234::::MESSAGE FROM SERVER::::
Lets play Water jug puzzel!! You give me sizes of two water Jars
And a desired level to be achieved! Ill tell you whether the problem
is solvable or not!!
Comprande~?
Enter your choice Y/N
--------------------------
Enter choice!
y
y
Wow!! awesome! Throw a challenge at me!
Enter Large jug volume,Small jug volume,Desired level in comma separated fashion
For example (5,3,2)
--------------------------
5,3,2
5,3,2
Exception in thread "main" java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
at MyTcpClient.readFromServer(MyTcpClient.java:85)
at MyTcpClient.main(MyTcpClient.java:78)
The exception that is being raised here is only when a string separated with commas is supplied. Dont have an idea what is going wrong , can anybody share something?
You have some other problems in your code:
Should not be static.
Should be neither static nor even an instance member. It should be a local variable in the method that calls accept().
Ditto in this case, but in the general case they should be instance members of a per-connection class that you instantiate for every newly accepted socket. This is usually a
Runnable,whoserun()method does all the I/O for that client, or calls methods that do so.