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Код

 try {
            welcomeSocket = new ServerSocket(strPort);
        } catch (IOException ex) {
            Logger.getLogger(GuiForm.class.getName()).log(Level.SEVERE, null, ex);
        }
         while(true)
         {
            
            try {
                connectionSocket = welcomeSocket.accept();
            } catch (IOException ex) {
                Logger.getLogger(GuiForm.class.getName()).log(Level.SEVERE, null, ex);
            }
            try {
                inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
            } catch (IOException ex) {
                Logger.getLogger(GuiForm.class.getName()).log(Level.SEVERE, null, ex);
            }
         
            try {
                outToClient = new DataOutputStream(connectionSocket.getOutputStream());
            } catch (IOException ex) {
                Logger.getLogger(GuiForm.class.getName()).log(Level.SEVERE, null, ex);
            }
            try {
                clientSentence = inFromClient.readLine();
            } catch (IOException ex) {
                Logger.getLogger(GuiForm.class.getName()).log(Level.SEVERE, null, ex);
            }
            System.out.println("Received: " + clientSentence);
            capitalizedSentence = clientSentence.toUpperCase() + '\n';
            try {
                outToClient.writeBytes(capitalizedSentence);
            } catch (IOException ex) {
                Logger.getLogger(GuiForm.class.getName()).log(Level.SEVERE, null, ex);
            }
         }