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Thread: What's wrong with my code for remembering JFileChooser's Last Directory?

  1. July 18th, 2011, 04:26 AM #1
    esplanade56
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    Default What's wrong with my code for remembering JFileChooser's Last Directory?

    I need to let my JFileChooser to remember my last directory that I've visited.

    Error I got:Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at MarksKeystroke$1.actionPerformed(MarksKeystroke.ja va:62)
    at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:19
    95)

    import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.IOException;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import java.util.prefs.*;
import javax.swing.JFileChooser;
import java.io.File;
 
public class MarksKeystroke {
 
  		static String key;
		static String fullFileName;
		static JTextField jtfFile, jtfCell;
	    static private Robot robot;
	    static char colNumber;
		static JFileChooser chooser ;
		static private Preferences prefs;
 
		static String delay;
      	static String columnBegin="";
		static String rowBegin="";
		static String columnEnd="";
		static String rowEnd ="";
 
		static	int columnNo;
		static int rowNo = 0;
 
    public static void main(String... args) throws Exception {
 
		JFrame f = new JFrame();
    	f.setLayout(new BorderLayout());
    	f.setTitle("Marks Entering Keystroke");
    	f.setSize(450,200);
 
    	JPanel titlePanel = new JPanel();
    	JLabel title = new JLabel("Marks Entering Keystroke");
    	titlePanel.add(title);
 
    	JPanel contentPanel = new JPanel();
 
	    		//content pane
	    		JPanel contentPanel1 = new JPanel();
	    		contentPanel1.setLayout(new BorderLayout());
 
	    			//sub content pane 1 for conents.
	    			JPanel cp1 = new JPanel();
	    			cp1.setLayout(new BorderLayout());
 
	    			JLabel lblFile = new JLabel("File: ");
	    			final JTextField tfPath = new JTextField(20);
	    			JButton btnBrowse = new JButton("Browse");
	    			btnBrowse.addActionListener(new ActionListener() {
					        public void actionPerformed(ActionEvent e)   {
 
   	       	//System.out.println(prefs.get("LAST_OUTPUT_DIR", ""));//<<<<<<<<<<<<<<<
 
 
                        File f  = new File ( prefs.get("LAST_OUTPUT_DIR", "")); //<<<<<<<<<<<<<<<
                       chooser.setCurrentDirectory(f); //<<<<<<<<<<<<<<<
 
					         int retval = chooser.showOpenDialog(null);
					            if (retval == JFileChooser.APPROVE_OPTION) {
					                //... The user selected a file, process it.
 
					  			File mostRecentOutputDirectory = chooser.getSelectedFile();  //<<<<<<<<<<<<<<<
					            	prefs.put("LAST_OUTPUT_DIR", mostRecentOutputDirectory.getAbsolutePath());//<<<<<<<<<<<<<<<
 
 
 
				      		 JFileChooser chooser = new JFileChooser();
					            chooser.showOpenDialog(null);
					            File file = chooser.getSelectedFile();
					            String fileName = file.getName();
					            String strDirectory = file.getParent();
					            String con = "\\";
					            fullFileName = strDirectory + con + fileName;
					            tfPath.setText(fullFileName);
					           	System.out.println(fullFileName);
					            }
				    		  }});
 
 
	    			cp1.add(lblFile, BorderLayout.WEST);
	    			cp1.add(tfPath, BorderLayout.CENTER);
	    			cp1.add(btnBrowse, BorderLayout.EAST);
 
	    			JPanel cp2 = new JPanel();
	    			cp2.setLayout(new FlowLayout());
 
	    			JLabel lblDelay = new JLabel("Delay between Cells: ");
	    			final	JTextField tfDelay = new JTextField(5);
 
	    			JLabel lblType = new JLabel("Move between Cells: ");
	    			CheckboxGroup radio = new CheckboxGroup();
 
					final Checkbox	enterButton = new Checkbox("Enter", radio, true);
					final Checkbox	tabButton = new Checkbox("Tab", radio, false);
 
					cp2.add(lblDelay);
		    		cp2.add(tfDelay);
 
	    			cp2.add(lblType);
	    			cp2.add(enterButton);
	    			cp2.add(tabButton);
 
	    		JPanel contentPanel2 = new JPanel();
	    		contentPanel2.setLayout(new BorderLayout());
 
	    			JPanel cp3 = new JPanel();
 
	    			JLabel lblCell = new JLabel("Cell Range (A-Z): ");
	    			final	JTextField tfCell = new JTextField(5);
 
	    			cp3.add(lblCell);
	    			cp3.add(tfCell);
 
	    	JPanel btnPanel = new JPanel();
 
	    	JButton btnStart = new JButton("Start");
	    	btnPanel.add(btnStart);
	    	  btnStart.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e)   {
 
 
      	 columnBegin="";	rowBegin="";	columnEnd="";	 rowEnd ="";  //Set to NULL whenever Start button is clicked
 
				delay = tfDelay.getText();
 
    	  		String path = tfPath.getText();
    	  		String cell = tfCell.getText();
 
				System.out.println(cell);
		       int posColon= cell.indexOf(":");
 
         String begin = cell.substring(0, posColon);
   		String end = cell.substring(posColon+1, cell.length() ) ;
 
 		 for (int i=0; i<begin.length(); i++)
 		  isNumber(""+begin.substring(i,i+1) )  ;
         System.out.println("col is "+columnBegin + "\t row is " + rowBegin );
 
         for (int i=0; i<end.length(); i++)
 		 isNumber1(""+end.substring(i,i+1) ) ;
 
		 int rowNo1 = Integer.parseInt(rowBegin) - 1;
 
 		 int rowNo = Integer.parseInt(rowEnd) ;
 
         System.out.println("col is "+columnEnd + "\t row is " + rowNo );
 
		Character c = new Character(columnBegin.charAt(0));
		Character c1 = new Character(columnEnd.charAt(0));
 
		  colNumber(c);
		  colNumber(c1);
 
    try
    {
    	Thread.sleep(1000);
    	MarksKeystroke keyboard = new MarksKeystroke();
 
        Workbook workbook = Workbook.getWorkbook(new File(path));
        Sheet sheet = workbook.getSheet(0);
 
  		 for (int x=rowNo1; x<rowNo; x++) {
  		    Cell excel1 = sheet.getCell(columnNo, x);
 
  		     String data1 = excel1.getContents();
  		     System.out.println(data1);
  		     keyboard.type(data1);
 
 					if (tabButton.getState() == true) {
			           keyboard.type("\t");
			           	System.out.println("tab");
			        } else{
			           keyboard.type("\n");
			          	System.out.println("enter");
			        }
 
  		     //keyboard.type(key);
  		 }
		  keyboard.type("\n");
          }
  		  catch (Exception ex) {}
      }
    });
 
	    		contentPanel1.add(cp1, BorderLayout.NORTH);
	    		contentPanel1.add(cp2, BorderLayout.CENTER);
 
	    		contentPanel2.add(cp3, BorderLayout.NORTH);
 
    		contentPanel.add(contentPanel1);
    		contentPanel.add(contentPanel2);
 
    	f.add(titlePanel, BorderLayout.NORTH);
    	f.add(contentPanel, BorderLayout.CENTER);
    	f.add(btnPanel, BorderLayout.SOUTH);
    	f.setVisible(true);
    }
 
			static boolean isNumber(String c)
		{
	    	try
	    	{
	    	  	Integer.parseInt(c);
	    	  	 rowBegin +=c;
	    		return true;
	    	}
	    	catch (Exception e)
	    	{
			   columnBegin +=c;
			   	return false;
	    	}
   		 }
 
		static boolean isNumber1(String c1)
		{
	    	try
	    	{
	    	  	Integer.parseInt(c1);
	    	  	 rowEnd +=c1;
	    		return true;
	    	}
	    	catch (Exception e)
	    	{
	    			   columnEnd +=c1;
	    		  		return false;
	    	}
	    }
 
	static void colNumber (char character)
	{
	//	int columnNo = 0;
 
	switch (character)
		{
			case 'A': columnNo =0; break;
			case 'B': columnNo = 1; break;
			case 'C': columnNo = 2; break;
			case 'D': columnNo = 3; break;
			case 'E': columnNo = 4; break;
			case 'F': columnNo = 5; break;
			case 'G': columnNo = 6; break;
			case 'H': columnNo = 7; break;
			case 'I': columnNo = 8; break;
			case 'J': columnNo = 9; break;
			case 'K': columnNo = 10; break;
			case 'L': columnNo = 11; break;
			case 'M': columnNo = 12; break;
			case 'N': columnNo = 13; break;
			case 'O': columnNo = 14; break;
			case 'P': columnNo = 15; break;
			case 'Q': columnNo = 16; break;
			case 'R': columnNo = 17; break;
			case 'S': columnNo = 18; break;
			case 'T': columnNo = 19; break;
			case 'U': columnNo = 20; break;
			case 'V': columnNo = 21; break;
			case 'W': columnNo = 22; break;
			case 'X': columnNo = 23; break;
			case 'Y': columnNo = 24; break;
			case 'Z': columnNo = 25; break;
		}
	}
 
   public MarksKeystroke() throws AWTException {
        this.robot = new Robot();
        prefs = Preferences.userNodeForPackage(this.getClass());
    }
 
    public MarksKeystroke(Robot robot) {
        this.robot = robot;
    }
 
    public void type(CharSequence characters) {
        int length = characters.length();
        for (int i = 0; i < length; i++) {
                char character = characters.charAt(i);
                type(character);
        }
    }
 
   public void type(char character) {
        switch (character) {
        case 'a': doType(KeyEvent.VK_A); break;
        case 'b': doType(KeyEvent.VK_B); break;
        case 'c': doType(KeyEvent.VK_C); break;
        case 'd': doType(KeyEvent.VK_D); break;
        case 'e': doType(KeyEvent.VK_E); break;
        case 'f': doType(KeyEvent.VK_F); break;
        case 'g': doType(KeyEvent.VK_G); break;
        case 'h': doType(KeyEvent.VK_H); break;
        case 'i': doType(KeyEvent.VK_I); break;
        case 'j': doType(KeyEvent.VK_J); break;
        case 'k': doType(KeyEvent.VK_K); break;
        case 'l': doType(KeyEvent.VK_L); break;
        case 'm': doType(KeyEvent.VK_M); break;
        case 'n': doType(KeyEvent.VK_N); break;
        case 'o': doType(KeyEvent.VK_O); break;
        case 'p': doType(KeyEvent.VK_P); break;
        case 'q': doType(KeyEvent.VK_Q); break;
        case 'r': doType(KeyEvent.VK_R); break;
        case 's': doType(KeyEvent.VK_S); break;
        case 't': doType(KeyEvent.VK_T); break;
        case 'u': doType(KeyEvent.VK_U); break;
        case 'v': doType(KeyEvent.VK_V); break;
        case 'w': doType(KeyEvent.VK_W); break;
        case 'x': doType(KeyEvent.VK_X); break;
        case 'y': doType(KeyEvent.VK_Y); break;
        case 'z': doType(KeyEvent.VK_Z); break;
        case 'A': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_A); break;
        case 'B': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_B); break;
        case 'C': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_C); break;
        case 'D': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_D); break;
        case 'E': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_E); break;
        case 'F': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_F); break;
        case 'G': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_G); break;
        case 'H': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_H); break;
        case 'I': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_I); break;
        case 'J': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_J); break;
        case 'K': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_K); break;
        case 'L': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_L); break;
        case 'M': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_M); break;
        case 'N': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_N); break;
        case 'O': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_O); break;
        case 'P': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_P); break;
        case 'Q': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_Q); break;
        case 'R': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_R); break;
        case 'S': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_S); break;
        case 'T': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_T); break;
        case 'U': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_U); break;
        case 'V': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_V); break;
        case 'W': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_W); break;
        case 'X': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_X); break;
        case 'Y': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_Y); break;
        case 'Z': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_Z); break;
        case '`': doType(KeyEvent.VK_BACK_QUOTE); break;
        case '0': doType(KeyEvent.VK_0); break;
        case '1': doType(KeyEvent.VK_1); break;
        case '2': doType(KeyEvent.VK_2); break;
        case '3': doType(KeyEvent.VK_3); break;
        case '4': doType(KeyEvent.VK_4); break;
        case '5': doType(KeyEvent.VK_5); break;
        case '6': doType(KeyEvent.VK_6); break;
        case '7': doType(KeyEvent.VK_7); break;
        case '8': doType(KeyEvent.VK_8); break;
        case '9': doType(KeyEvent.VK_9); break;
        case '-': doType(KeyEvent.VK_MINUS); break;
        case '=': doType(KeyEvent.VK_EQUALS); break;
        case '~': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_BACK_QUOTE); break;
        case '!': doType(KeyEvent.VK_EXCLAMATION_MARK); break;
        case '@': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_2); break;
 
        //case '@': doType(KeyEvent.VK_AT); break;
        case '#': doType(KeyEvent.VK_NUMBER_SIGN); break;
        case '$': doType(KeyEvent.VK_DOLLAR); break;
        case '%': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_5); break;
        case '^': doType(KeyEvent.VK_CIRCUMFLEX); break;
        case '&': doType(KeyEvent.VK_AMPERSAND); break;
        case '*': doType(KeyEvent.VK_ASTERISK); break;
        case '(': doType(KeyEvent.VK_LEFT_PARENTHESIS); break;
        case ')': doType(KeyEvent.VK_RIGHT_PARENTHESIS); break;
        case '_': doType(KeyEvent.VK_UNDERSCORE); break;
        case '+': doType(KeyEvent.VK_PLUS); break;
        case '\t': doType(KeyEvent.VK_TAB); break;
        case '\n': doType(KeyEvent.VK_ENTER); break;
        case '[': doType(KeyEvent.VK_OPEN_BRACKET); break;
        case ']': doType(KeyEvent.VK_CLOSE_BRACKET); break;
        case '\\': doType(KeyEvent.VK_BACK_SLASH); break;
        case '{': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_OPEN_BRACKET); break;
        case '}': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_CLOSE_BRACKET); break;
        case '|': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_BACK_SLASH); break;
        case ';': doType(KeyEvent.VK_SEMICOLON); break;
        case ':': doType(KeyEvent.VK_COLON); break;
        case '\'': doType(KeyEvent.VK_QUOTE); break;
        case '"': doType(KeyEvent.VK_QUOTEDBL); break;
        case ',': doType(KeyEvent.VK_COMMA); break;
        case '<': doType(KeyEvent.VK_LESS); break;
        case '.': doType(KeyEvent.VK_PERIOD); break;
        case '>': doType(KeyEvent.VK_GREATER); break;
        case '/': doType(KeyEvent.VK_SLASH); break;
        case '?': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_SLASH); break;
        case ' ': doType(KeyEvent.VK_SPACE); break;
 
        //Arrow Key
        default:
                throw new IllegalArgumentException("Cannot type character " + character);
        }
    }
 
     public void typeArrow(String d) {
 
     	if (d.equals("Up")) doType(KeyEvent.VK_UP); else
     	if (d.equals("Down")) doType(KeyEvent.VK_DOWN); else
     	if (d.equals("Left")) doType(KeyEvent.VK_LEFT); else
     	if (d.equals("Right")) doType(KeyEvent.VK_RIGHT);
 
    }
    private void doType(int... keyCodes) {
        doType(keyCodes, 0, keyCodes.length);
    }
 
    private void doType(int[] keyCodes, int offset, int length) {
        if (length == 0) {
                return;
        }
        robot.keyPress(keyCodes[offset]);
 
        doType(keyCodes, offset + 1, length - 1);
        	  		robot.delay(Integer.parseInt(delay));
        robot.keyRelease(keyCodes[offset]);
    }
 
}
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  3. July 18th, 2011, 08:23 AM #2
    JavaPF
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    Default Re: What's wrong with my code for remembering JFileChooser's Last Directory?

    Once again you've posted code which uses a non standard library so no one is going to be able to compile this straight off.

    I suggest you create a smaller program and concentrate on getting just the JFileChooser to work.
    If you post this smaller code back here, we can help you move forward.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
    Forum Tip: Add to peoples reputation by clicking the button on their useful posts.
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