Styjun

I'm fairly new to Java so I was wondering if someone could help me figure this out.

I've managed to create a program which allows the user to input a file name which then shows the contents of the file in the system output but I want to be able to show the output in a JTextArea instead of the current place of output. Can some help me figure out how this could be possible?

As one of the comments suggested that I should add a JFrame before doing anything else and I have managed to create a JFrame with a JTextArea within it but I am still unable to display the text file in the TextArea.

import java.awt.GraphicsConfiguration;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;


public class OpenFile 

 static GraphicsConfiguration gc;

 public static void main(String[] args) 



 String selectModule = "";
 selectModule = JOptionPane.showInputDialog("Module Input: ");

 Path path = Paths.get(selectModule); 

 String fileOpener = selectModule;

 if(selectModule.equalsIgnoreCase(fileOpener))
 //Makes the user input case insensitive
 

 BufferedReader br = null;
 FileReader fr = null;

 try 

 //br = new BufferedReader(new FileReader(FILENAME));
 fr = new FileReader(fileOpener + ".txt");
 br = new BufferedReader(fr);

 String sCurrentLine;

 while ((sCurrentLine = br.readLine()) != null) 
 System.out.println(sCurrentLine);
 

 catch (IOException e) 

 e.printStackTrace();

 finally 

 try 

 if (br != null)
 br.close();

 if (fr != null)
 fr.close();

 catch (IOException ex) 

 ex.printStackTrace();

 

 

 JTextArea TextArea22 = new JTextArea(selectModule);

 JFrame frame= new JFrame(gc); 
 frame.setTitle("Opening TextFile");
 frame.setSize(600, 400);
 frame.setLocation(200, 200);
 frame.setVisible(true);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setResizable(false); 
 frame.add(TextArea22);

 

The code to read in the entire contents of a file can be simplified using Files.readAllBytes.

Once that is done, set the JTextArea's text to the captured file content. If an exception occurs while trying to read the file, we can output that as a helpful message to the JTextArea instead.

Last, remember that any code that manipulates a Swing component must be executed on the event dispatch thread. So, put that code in a Runnable and pass it to SwingUtilities.invokeLater.

Give this a try:

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

public class OpenFile 
 public static void main(String[] args) 
 String selectModule = JOptionPane.showInputDialog("Module Input: ");
 String content = "";

 try 
 content = new String(Files.readAllBytes(Paths.get(selectModule)));
 catch (IOException e) 
 content = e.toString();
 

 final String fileContent = content;

 Runnable r = new Runnable() 
 public void run() 
 JTextArea textArea22 = new JTextArea(fileContent);
 JFrame frame= new JFrame(); 
 frame.setTitle("Opening TextFile");
 frame.setSize(600, 400);
 frame.setLocation(200, 200);
 frame.setVisible(true);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setResizable(false); 
 frame.add(textArea22);
 
 ;

 SwingUtilities.invokeLater(r);