File Connection Using J2ME api JSR 75

Using the following code you can list the folders and files stored in the phone memory and the memory card.

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
* @author test
*/
public class FileSelection extends MIDlet {
      private Display display;
      FileSelector fileSelector;
      public FileSelection() {
            display=Display.getDisplay(this);
      }
      public void startApp() {
            fileSelector=new FileSelector(this);
            display.setCurrent(fileSelector);
      }

      public void pauseApp() {
      }

      public void destroyApp(boolean unconditional) {
            notifyDestroyed();
      }
}



/*
* File Connection Using JSR 75
*/

import javax.microedition.lcdui.*;
import java.io.*;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.*;
import javax.microedition.io.*;
import javax.microedition.io.file.*;
import javax.microedition.io.file.FileConnection;
/**
*
* @author Administrator
*/
public class FileSelector extends List implements CommandListener,FileSystemListener {
      FileSelection fileSelection;
      private Display display;
      // define the file separator
      private final static String FILE_SEPARATOR =(System.getProperty("file.separator") != null) ? System.getProperty("file.separator") : "/";
      private Command open = new Command("Open", Command.OK, 1);
      private String errorMsg = null;
      private Alert alert;
      private Vector rootsList = new Vector();
      private final static String upper_dir = "...";
      private FileConnection currentRoot = null;
      private FileConnection fconn = null;
      private static final int CHUNK_SIZE = 1024;

      FileSelector(FileSelection fileSelection) {
            super("File Browser", List.IMPLICIT);
            this.fileSelection = fileSelection;
            deleteAll();
            addCommand(open);
            setSelectCommand(open);
            setCommandListener(this);
            FileSystemRegistry.addFileSystemListener(FileSelector.this);
            execute();
      }

      public void execute() {
            String initDir = System.getProperty("fileconn.dir");
            loadRoots();
            if (initDir != null) {
                  try {
                        currentRoot = (FileConnection) Connector.open(initDir, Connector.READ);
                        displayCurrentRoot();
                  } catch (Exception e) {
                        displayAllRoots();
                  }
            } else {
                  displayAllRoots();
            }
      }

      private void loadRoots() {
            if (!rootsList.isEmpty()) {
                  rootsList.removeAllElements();
            }
            try {
                  Enumeration roots = FileSystemRegistry.listRoots();
                  while (roots.hasMoreElements()) {
                        rootsList.addElement(FILE_SEPARATOR + (String) roots.nextElement());
                  }
            } catch (Throwable e) {
            }
      }

      private void displayCurrentRoot() {
            try {
                  setTitle(currentRoot.getURL());
                  deleteAll();
                  append(upper_dir, null);
                  Enumeration listOfDirs = currentRoot.list("*", false);
                  while (listOfDirs.hasMoreElements()) {
                        String currentDir = (String) listOfDirs.nextElement();
                        if (currentDir.endsWith(FILE_SEPARATOR)) {
                              append(currentDir, null);
                        } else {
                              append(currentDir, null);
                        }
                  }

                  /*Enumeration listOfFiles = currentRoot.list("*.png",false);
                  while(listOfFiles.hasMoreElements()) {
                        String currentFile=(String) listOfFiles.nextElement();
                        if(currentFile.endsWith(FILE_SEPARATOR)) {
                              append(currentFile,null);
                        }
                        else {
                              append(currentFile,null);
                        }
                  }*/
            } catch (IOException e) {
            } catch (SecurityException e) {
            }
      }

      private void displayAllRoots() {
            setTitle("[Roots]");
            deleteAll();
            Enumeration roots = rootsList.elements();
            while (roots.hasMoreElements()) {
                  String root = (String) roots.nextElement();
            }
            currentRoot = null;
      }

      private void openSelected() {
            int selectedIndex = getSelectedIndex();
            if (selectedIndex >= 0) {
                  String selectedFile = getString(selectedIndex);
                  if (selectedFile.endsWith(FILE_SEPARATOR)) {
                        try {
                              if (currentRoot == null) {
                                    currentRoot = (FileConnection) Connector.open("file:///" + selectedFile, Connector.READ);
                              } else {
                                    currentRoot.setFileConnection(selectedFile);
                              }
                              displayCurrentRoot();
                        } catch (IOException e) {
                              System.out.println(e.getMessage());
                        } catch (SecurityException e) {
                              System.out.println(e.getMessage());
                        }
                  } else if (selectedFile.equals(upper_dir)) {
                        if (rootsList.contains(currentRoot.getPath() + currentRoot.getName())) {
                              displayAllRoots();
                        } else {
                              try {
                                    currentRoot = (FileConnection) Connector.open("file://" + currentRoot.getPath(), Connector.READ);
                                    displayCurrentRoot();
                              } catch (IOException e) {
                                    System.out.println(e.getMessage());
                              }
                        }
                  } else {
                        String url = currentRoot.getURL() + selectedFile;
                        byteConvert(url, selectedFile);
            }
      }

      public void stop() {
            if (currentRoot != null) {
                  try {
                        currentRoot.close();
                  } catch (IOException e) {
                  }
            }
      }

      public void byteConvert(String url, String filename) {
            try {
                  FileConnection fileConn = (FileConnection) Connector.open(url, Connector.READ);
                  InputStream fis = fileConn.openInputStream();
                  long overallSize = fileConn.fileSize();
                  int length = 0;
                  byte[] filedata = new byte[0];
                  while (length < overallSize) {//converting the selected file to bytes
                        byte[] data = new byte[CHUNK_SIZE];
                        int readAmount = fis.read(data, 0, CHUNK_SIZE);
                        byte[] newFileData = new byte[filedata.length + CHUNK_SIZE];
                        System.arraycopy(filedata, 0, newFileData, 0, length);
                        System.arraycopy(data, 0, newFileData, length, readAmount);
                        filedata = newFileData;
                        length += readAmount;
                  }
                  fis.close();
                  fileConn.close();
                  //here u can write a code to connect with the server for sending the selected file
            } catch (Exception e) {
                  //showAlert(e.getMessage());
            } finally {
            }
      }

      public void commandAction(Command c, Displayable d) {
            if (c == open) {
                  openSelected();
            }
      }

      public void rootChanged(int state, String rootNmae) {
      }
}