How to Load Files using JFileChooser!!

This topic is about Loading Files using JFileChooser class. The following bit of code will open a Dialog. A window, that in turn will allow a user to search for a file and then by clicking on it and pressing the open button of the JFilechooser, they will load the file into your program.

This will depend on what you are using to view a file... For this, I will be using a JTextArea, and I will be loading Text Files into it.

java code

import java.io.*;
import java.io.File.*;
import java.util.*;
import javax.swing.JFileChooser;

try
  {
    JFileChooser loadEmp = new JFileChooser();//new dialog
    File selectedFile;//needed*
    BufferedReader in;//needed*
    FileReader reader = null;//needed*,look these three up for further info
    
    //opens dialog if button clicked
    if (loadEmp.showOpenDialog(this)==JFileChooser.APPROVE_OPTION)
    {
      //gets file from dialog
      selectedFile = loadEmp.getSelectedFile();
      //makes sure files can be processed before proceeding
      if (selectedFile.canRead() && selectedFile.exists())
      {
      reader = new FileReader(selectedFile);
      }
    }
    
   in = new BufferedReader(reader);
   
    //inputLine recieves file text
    String inputLine = in.readLine();
    int LineNumber = 0;
    while(inputLine!=null)
    {
      //LineNumber isn't needed, but it adds a line count on the left, nice
      LineNumber++;
      StringTokenizer tokenizer = new StringTokenizer(inputLine);
      
      //displays text file
      jTxtAMain.append(LineNumber+": "+inputLine+"\n");
      //next line in File opened
      inputLine = in.readLine();
    }
    //close stream, files stops loading
    in.close();
  }
  //catches input/output exceptions and all subclasses exceptions
  catch(IOException ex)
  {
    jTxtAMain.append("Error Processing File:\n" + ex.getMessage()+"\n");
  }
  //catches nullpointer exception, file not found
  catch(NullPointerException ex)
  {
    jTxtAMain.append("Open File Cancelled:\n" + ex.getMessage()+"\n");
  }

I hope this helps someone.