socket 및javaFX 기반 단순 파일 전송 도구

package application;
   
import java.io.File;
 
import org.james.component.ButtonBox;
import org.james.component.FileReceiverGrid;
import org.james.component.FileSenderGrid;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
 
 
public class Main extends Application {
   
  public static Stage primaryStage;
   
  @Override
  public void start(Stage primaryStage) {
    try {
      this.primaryStage = primaryStage;
      primaryStage.setFullScreen(false);
      primaryStage.setResizable(false);
       
      FileReceiverGrid fileReceiverGrid = new FileReceiverGrid();
      fileReceiverGrid.initialize();
      FileSenderGrid fileSenderGrid = new FileSenderGrid();
      fileSenderGrid.initialize();
       
      ButtonBox buttonBox = new ButtonBox();
      buttonBox.initialize();
       
      BorderPane root = new BorderPane();
      root.setTop(fileReceiverGrid);
      root.setBottom(buttonBox);
       
      buttonBox.getReceiveFileFunc().setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
          buttonBox.getReceiveFileFunc().setDisable(true);
          buttonBox.getSendFileFunc().setDisable(false);
          root.setTop(fileReceiverGrid);
        }
      });
       
      buttonBox.getSendFileFunc().setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
          buttonBox.getReceiveFileFunc().setDisable(false);
          buttonBox.getSendFileFunc().setDisable(true);
          root.setTop(fileSenderGrid);
        } 
      });
       
      fileSenderGrid.getSelectFileBtn().setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
          FileChooser fileChooser = new FileChooser();
          fileChooser.setTitle(" ");
          File selectedFile = fileChooser.showOpenDialog(primaryStage);
          if(selectedFile != null){
            fileSenderGrid.setFile(selectedFile);
            fileSenderGrid.getFileNameLabel().setText(selectedFile.getPath());
          }
        } 
      });
       
      Scene scene = new Scene(root,800,400);
      scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
      primaryStage.setScene(scene);
      primaryStage.show();
    } catch(Exception e) {
      e.printStackTrace();
    }
  }
   
   
  public static void main(String[] args) {
    launch(args);
  }
}