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Retrieve a file from storage starting with a String

I´m having problems trying to retrieve a single image file from a folder in Android.
The filename is "00070 bipack GV ZZZ.jpg". My code:
File dirRoot = rootMicroSd(context);
if (dirRoot == null) return "";
File imgDir = new File(dirRoot, DefPrefsUtil.getDirImg(context) + "/");
String referenciaCeros = "";
for (int i = String.valueOf(referencia).length(); i < 5; i++) {
referenciaCeros += "0";
}
referenciaCeros += String.valueOf(referencia); //00070 e.g.
Now, with that string containing "00070" my next (and I think final) step is retrieve the file in imgDir that starts with that string in my sdCard root path.

I manage to figure out, applying a filter:
File dirRoot = rootMicroSd(context);
if (dirRoot == null) return "";
File directorio = new File(dirRoot, DefPrefsUtil.getDirImg(context) + "/");
String referenciaCeros = "";
for (int i = String.valueOf(referencia).length(); i < 5; i++) {
referenciaCeros += "0";
}
referenciaCeros += String.valueOf(referencia);
final String finalReferenciaCeros = referenciaCeros;
File[] allFiles = directorio.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
boolean valido = (name.startsWith(finalReferenciaCeros) && (name.endsWith(".jpg") || name.endsWith(".JPG")));
return valido;
}
});
if (allFiles.length == 0) return "";
return allFiles[0].getAbsolutePath();
This way the list always come with my desired image or nothing, so I can display a default image in case that it comes empty ^^

Resetting Java while loop

I currently have 2 loops, one which gets a timestamp, and another while loop to find the mapped information based off that time stamp and output in a certain way.
Issue I have is I am currently looping through a text, and want it to start reading the file from the beginning again when the isdone="N" for the second loop, however, this does not seem to be the case.
Code so far:
public static void organiseFile() throws FileNotFoundException {
String directory = "C:\\Users\\xxx\\Desktop\\Files\\ex1";
Scanner fileIn = new Scanner(new File(directory + "_temp.txt"));
Scanner readIn = new Scanner(new File(directory + ".txt"));
PrintWriter out = new PrintWriter(directory + "_ordered.txt");
ArrayList<String> lines = new ArrayList<String>();
String readTimeStamp = "";
String timeStampMapping = "";
String outputFirst = "";
String outputSecond = "";
String outputThird = "";
String previousTimeStamp = "";
String doneList = "";
String isdone = "";
int counter = 1;
// Loop to get time stamps
while(fileIn.hasNextLine()) {
readTimeStamp = fileIn.nextLine();
if(readTimeStamp != null && readTimeStamp.trim().length() > 0) {
readTimeStamp = readTimeStamp.substring(12, 25);
System.out.println(readTimeStamp);
// Previous time stamp found, no need to loop through it again
if(doneList.contains(readTimeStamp))
isdone = "Y";
// Counter in place to stop outputting the first record, otherwise output file and clear variables down
else if(!previousTimeStamp.equals(readTimeStamp) && counter > 1) {
out.println(outputFirst + outputSecond + outputThird);
System.out.println("Outputting....");
outputFirst = "";
outputSecond = "";
outputThird = "";
counter = 1;
}
// New time stamp found, start finding values in second loop
else
isdone = "N";
// Secondary loop to find match of record
while(readIn.hasNextLine() && isdone.equals("N")) {
System.out.println("Mapping...");
timeStampMapping = readIn.nextLine();
System.out.println(timeStampMapping);
// When a record has been found with matching time stamps, start ordering
if(timeStampMapping.contains(readTimeStamp)) {
previousTimeStamp = readTimeStamp;
System.out.println(previousTimeStamp);
if(timeStampMapping.contains("[EVENT=agentStateEvent]")) {
outputFirst += timeStampMapping + "\r\n";
} else if(timeStampMapping.contains("[EVENT=TerminalConnectionCreated]")) {
outputSecond += timeStampMapping + "\r\n";
} else {
outputThird += timeStampMapping + "\r\n";
doneList += readTimeStamp + ",";
}
counter++;
}
}
}
}
System.out.println("Outputting final record");
out.println(outputFirst + outputSecond + outputThird);
System.out.println("Complete!");
out.close();
}

You can use Scanner.reset() to reset it to the beginning of the file. For example, after your second while-loop include:
if (isdone.equals("Y")) {
fileIn.reset();
}
Btw: why are you using String for isdone instead of boolean??

Comparing two byte arrays in java

I am trying to develop a program that searches for duplicate files using MD5 hash, it will compare two hash files for duplicate.
I am having difficulties comparing the two files, after hashing the files with MD5 hash code, I keep getting the error "Java.IO.FileNotFoundException.". Here is my code, I do not know what I am doing wrong.
////////////////////// It is a GUI Program ////////////////////////
DefaultListModel m = new DefaultListModel(); // List Model for displaying the hash codes
int rval = chooser.showOpenDialog(null); //JFileChooser for selecting files tobehashed
if(rval == JFileChooser.APPROVE_OPTION){
File f = chooser.getCurrentDirectory();
String fs = f + "";
if(!f.isDirectory()){
JOptionPane.showMessageDialog(null, "Supplied Directory does not exist");
}
//display files on the TesxtField component
File[] filenames = f.listFiles();
String fn = Arrays.toString(filenames);
String type = f.isFile() ? "File" : "Directory : ";
long len = f.length();
String all = type +" "+" " + " Length: " + len;
dis.setText(all + "\n");
dis.setText(fn + "\n" + "\n" );
//Loops through the file and check sum of the list files
for(File file : f.listFiles()){
String hash;
try {
hash = MD5.asHex(MD5.getHash(file));
////////// Here is where my problems starts, Please help //////////
for(int i = 0; i < hash.length(); i++ )
for(int j = i + 1; j < hash.length(); j++){
File[] f1 = new File[i];
File[] f2 = new File[j];
boolean check = MD5.hashesEqual(MD5.getHash(new File(Arrays.toString(f1))),MD5.getHash(new File(Arrays.toString(f2)))); //compares the byte of files
System.out.println(check);
m.addElement(hash);
task.setModel(m);
}
}catch (IOException ex) {
JOptionPane.showMessageDialog(null, ex);
}
}

For reading files in Java you need an InputStream object.
Look at this Question Getting a File's MD5 Checksum in Java which seems to help you with your problem

Java Path Files.copy rename if exists

just a simple question, with a hard (for me) to find answer :D. Here is my code (im going to try to translate the spanish part):
File carpetanueva = new File("C:"+File.separator+"sistema" + File.separator +
fechasal+File.separator+doc);
carpetanueva.mkdirs();
carpetanueva.setWritable(true);
rutadestino = ("c:"+File.separator+"sistema" +
File.separator + fechasal+File.separator +
doc+File.separator+"imagen.jpg");
//realizo la copia de la imagen desde el jfilechooser a su destino:
Path desde = Paths.get(rutaorigen);
Path hacia = Paths.get(rutadestino);
try {
Files.copy(desde, hacia);
JOptionPane.showMessageDialog(null,
"Se adjunto la planilla de ambulancia correctamente");
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "error: "+e.getLocalizedMessage());
}
I get "rutaorigen" (frompath) from a JFileChooser. And I create "rutadestino" (topath) by using some variables so this way i can give an order. The problem is.. .if directories and the file "imagen.jpg" already exists, it gives an error.. (exception).. How can i make to check if image already exists, and if it does, rename the new image to , for example, imagen2? I cant figure out code, because im a newbie, I did a research and couldnt find something like this! Thanks in advance :)

OK, here is a quick solution if src is a Path to the file you want to copy, dst a Path to the file you want to write, and newName a Path to the file you want to rename to:
if (Files.exists(dst))
Files.move(dst, newName);
Files.copy(src, dst);
Note that you can use the methods in Path to facilitate your path building: .resolve(), .resolveSibling(), .relativize().
Edit: here is a function which will return a suitable name given a directory (dir), a base filename baseName and an "extension" (without the dot) extension:
private static Path findFileName(final Path dir, final String baseName,
final String extension)
{
Path ret = Paths.get(dir, String.format("%s.%s", baseName, extension));
if (!Files.exists(ret))
return ret;
for (int i = 0; i < Integer.MAX_VALUE; i++) {
ret = Paths.get(dir, String.format("%s%d.%s", baseName, i, extension));
if (!Files.exists(ret))
return ret;
}
throw new IllegalStateException("What the...");
}

I think this link will help How do I check if a file exists?
So for your case, probably do something like:
File toFile = new File(rutadestino);
if (toFile.exists()) {
// rename file
toFile.renameTo(new File("newFilePath/newName.jpg"));
} else {
// do something if file does NOT exist
}
Hope that helps! For more info, also check the Java Docs for File

sory late. but my code can help to litle bit.
public void copyFile(File source, File dest) throws IOException,
FileAlreadyExistsException {
File[] children = source.listFiles();
if (children != null) {
for (File child : children) {
if (child.isFile() && !child.isHidden()) {
String lastEks = child.getName().toString();
StringBuilder b = new StringBuilder(lastEks);
File temp = new File(dest.toString() + "\\"
+ child.getName().toString());
if (child.getName().contains(".")) {
if (temp.exists()) {
temp = new File(dest.toString()
+ "\\"
+ b.replace(lastEks.lastIndexOf("."),
lastEks.lastIndexOf("."), " (1)")
.toString());
} else {
temp = new File(dest.toString() + "\\"
+ child.getName().toString());
}
b = new StringBuilder(temp.toString());
} else {
temp = new File(dest.toString() + "\\"
+ child.getName());
}
if (temp.exists()) {
for (int x = 1; temp.exists(); x++) {
if (child.getName().contains(".")) {
temp = new File(b.replace(
temp.toString().lastIndexOf(" "),
temp.toString().lastIndexOf("."),
" (" + x + ")").toString());
} else {
temp = new File(dest.toString() + "\\"
+ child.getName() + " (" + x + ")");
}
}
Files.copy(child.toPath(), temp.toPath());
} else {
Files.copy(child.toPath(), temp.toPath());
}
} else if (child.isDirectory()) {
copyFile(child, dest);
}
}
}
}
features :
1. rename if file exist in the destination. example: document.doc if exist document (1).doc if exist document (2).doc if exist ...
2. copy all file from source (only file) to one folder in destination

The code below checks if the file already exists in destination, if it does, it appends #1 to file name just before the extension. If that file name also exists, it keeps appending #2,#3,#4... till the file name doesn't exist in destination. Since () and spaces create problems in Unix environment, I used # instead.
You can extend this and do a SUMCHECK if the file in destination with the identical name also has the same content and act accordingly.
Credit goes to johan indra Permana
String lastEks = file.getName().toString();
StringBuilder b = new StringBuilder(lastEks);
File temp = new File(backupDir.toString() + File.separator + file.getName().toString());
if (file.getName().contains(".")) {
if(temp.exists()) {
temp = new File(backupDir.toString() + File.separator +
b.replace(lastEks.lastIndexOf("."), lastEks.lastIndexOf("."),"#1").toString());
} else {
temp = new File(backupDir.toString() + File.separator + file.getName().toString());
}
b = new StringBuilder(temp.toString());
} else {
temp = new File(backupDir.toString() + File.separator + file.getName());
}
if (temp.exists()) {
for (int x=1; temp.exists(); x++) {
if(file.getName().contains(".")) {
temp = new File (b.replace(
temp.toString().lastIndexOf("#"),
temp.toString().lastIndexOf("."),
"#" + x ).toString());
} else {
temp = new File(backupDir.toString() + File.separator
+ file.getName() + "#" + x );
}
}
Files.copy(file.toPath(), temp.toPath());
} else {
Files.copy(file.toPath(), temp.toPath());
}

add a commandline command to a file rename batch

I have a working file rename java tool, now I want to add an if condition to run a commandline command if I checked a box as part of the rename process on each file it renames.
I will be changing the dos code later, but its a sample I found that works. Part of my problem is my filerename is its own class, so I will also need to figure out how to combine this class or reference the dos command somehow from my main rename class.
update
I updated the code with the changes from the answer, but the commandline command does not work and it crashes java with no error. The command does work from cmd line.
import java.io.IOException;
import java.io.InputStream;
public class doscommandrun {
public static void run() {
final String dosCommand = "cmd converter.exe file.doc -android -o file.txt";
try {
final Process process = Runtime.getRuntime().exec(
dosCommand + " ");
final InputStream in = process.getInputStream();
int ch;
while((ch = in.read()) != -1) {
System.out.print((char)ch);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
enter code hereFile rename code:
private void renameFile(){
boolean operationResult = false;
boolean overallResult = true;
int failCount = 0;
/* the operation of this part is ensured by the chooseDirectory()
* WE get the list of files in the directory
* get the conditions set by users
* and perform the file rename operation.
*/
//Let's get all the information from user
String[] fileList = directory.list(); //the list of files in the directory
String Prefix = txtPrefix.getText();
String Rename = txtRename.getText();
String Suffix = txtSuffix.getText();
String digits = (String) cboSequence.getSelectedItem();
int StartingNum;
String generatedSequence;
File oldFile;
//let's call the output frame
if(cbxOutput.isSelected() && OUTPUT_ON == false){
buildOutput();
OUTPUT_ON = true;
}
//display the list of files and readability of each file
for(int i = 0; i < fileList.length; i++){
oldFile = new File(directory.getPath()+"/"+ fileList[i]);
String readability = fileList[i] +" - readable?: "+oldFile.canRead();
System.out.println(readability);
if(OUTPUT_ON)
txaOutput.append("\n"+readability);
}
for(int i = 0; i < fileList.length; i++){
/* get the file extension that we need, and form a new name,
* we would check if the Ignore File Extension is selected
*/
oldFile = new File(directory.getPath()+"/"+ fileList[i]);
String fileExtension;
if(cbxIgnoreExtension.isSelected() == true ){
fileExtension = "";
}
else
fileExtension = getFileExtension(fileList[i]);
//this part get the original filename
String fileName = getFileName(fileList[i]);
String inputInfo = "The input filename->"+ fileList[i] + "\nfile name->" + fileName + "\nextension->" + fileExtension;
System.out.println(inputInfo);
if(OUTPUT_ON)
txaOutput.append("\n"+inputInfo);
/* generate sequence for the Name
*if the digits selection is NONE, we ignore it
*/
if(digits.equals("None") == true){
generatedSequence = "";
}
else{
StartingNum = Integer.parseInt(txtSequence.getText());
generatedSequence = nameSequence(StartingNum + i, digits);
}
//this is affected by the RenameOption, if Rename has something then only we RENAME
if(cbxRename.isSelected() == true){
fileName = Rename + generatedSequence; //the fileName will change.
}
else{
//if Rename has nothing, but the txtSequence has some Value, we take it to the naming too
fileName = fileName.substring(0,4)+ generatedSequence;
if(cbxAndroid.isSelected() == true ){
doscommandrun.run();
}
//the New File Name
String newFileName = Prefix + fileName.substring(0,4) + Suffix + fileExtension;
String tentativeName = "new Filename will be ->"+newFileName+"\n";
System.out.println(tentativeName);
if(OUTPUT_ON)
txaOutput.append("\n"+tentativeName);
// ! Perform the file rename, if the Experimental Mode is not selected
if(cbxExperiment.isSelected() == false){
operationResult = oldFile.renameTo(new File(directory.getPath()+"/"+newFileName));
String renameResult = "\t*Rename successfully?: " + operationResult+"\n\n";
System.out.println(renameResult);
if(operationResult == false)
failCount++;
if(OUTPUT_ON)
txaOutput.append("\n"+renameResult);
//make up the overall result
overallResult = (operationResult && overallResult);
}
}
if(cbxExperiment.isSelected() == false){
System.out.println("Overall Result: "+overallResult);
if(overallResult)
JOptionPane.showMessageDialog(null, "All files renamed successfully!");
else
JOptionPane.showMessageDialog(null, "File renamed with "+ failCount+ " failure(s)");
}//end if
}
}//end renameFile

You can create a static method in the doccommandrun class called run() which will execute what is currently in the main method when called.
public class DosCommandRun
{
public static void run()
{
//..do stuff from main
}
}
Now whenever you want to call the dos command you can just insert DosCommandRun.run() into your code.

I add /c after the cmd in my renametool class
I am still having issues but wither a different problem.