لیست فایل های داخل پوشه [بایگانی]

dr_jacky_2005

شنبه 08 مرداد 1390, 10:05 صبح

سلام
یه سوال مهم دارم:
چگونه میتوان لیست فایل های موجود در یک پوشه را به دست آورد.مثلا بتونیم لیست عکس های موجود در پوشه عکس ها رو به دست بیاریم.یعنی اسم همه فایل های موجود داخل اون پوشه.

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(FileSelec tor.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) {
}
}