CDE

Task/Echo-server/Java/echo-server.java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class EchoServer {
+	ServerSocket serverSocket;	
+	public EchoServer(){		
+	}
+	
+	public void start() {		
+		try {
+			serverSocket = new ServerSocket(12321);
+			while(true){
+				Thread clientThread = new Thread(new ClientHandler(serverSocket.accept()));
+				clientThread.start();
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		} finally {
+			try {
+				System.out.println("closing server socket");
+				serverSocket.close();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+		
+	}
+	
+	public static void main(String[] args) {
+		EchoServer es = new EchoServer();
+		es.start();
+	}
+}
+
+class ClientHandler implements Runnable {
+	private static int numConnections;
+	private int connectionId = 0;
+	Socket clientSocket;
+	
+	public ClientHandler(Socket s) {
+		connectionId = numConnections++;
+		System.out.println("handling connection, #" + connectionId);
+		clientSocket = s;
+	}
+
+	public void run() {
+		PrintWriter out = null;
+		BufferedReader in = null;
+		try {
+			out = new PrintWriter(clientSocket.getOutputStream(), true);
+			in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+			String inputLine, outputLine;
+			while((inputLine = in.readLine()) != null){
+				outputLine = inputLine;
+				System.out.println("recieved: " + outputLine);
+				out.write(outputLine+"\n");
+				out.flush();
+				if (outputLine.equals("exit"))
+					break;
+			}
+		} catch(Exception e) {
+			e.printStackTrace();
+		} finally {
+			out.close();
+			try {
+				in.close();
+				clientSocket.close();
+				System.out.println("closing connection, #" + connectionId);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+}