I am designing a program that saves the index location for specific characters from a message. Then, I need to retrieve these characters according to their index location. I kept the locations for these characters in a .txt file. I retrieved them, but at the end, I got this message "Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index 120 out of bounds for length 120".
My codes:
int n;
String s;
int lineNumCount = 0;
String coverText = stegoMsg.getText(); // get the stego text from the textfield
int k = coverText.length(); // get the length for the stego text
int lineNumb = 1;
Scanner myFile = null;
try{
Scanner file = new Scanner(new File("location.txt"));//location.txt is the file that has the locations for the characters
myFile = file;
}catch (FileNotFoundException e){
System.out.println("File does not found");
}
while (myFile.hasNextLine()){
//Count the Number of the lines in location.txt
//1. Read the File
File fileLocation = new File("location.txt");
if(fileLocation.exists()){
try {
FileReader fr = new FileReader(fileLocation);
LineNumberReader lr = new LineNumberReader(fr); //2. Read the lines for location.txt
while((lr.readLine()) !=null){
lineNumCount++;
}
// System.out.println("Total Number of the Lines " + lineNumCount);
} catch (FileNotFoundException ex) {
Logger.getLogger(ExtPage.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(ExtPage.class.getName()).log(Level.SEVERE, null, ex);
}
for(int x = 0; x<lineNumCount; ++x){
try{
String line = Files.readAllLines(Paths.get("location.txt")).get(lineNumb);
// System.out.println("Line First " + line);
BufferedReader bufrd = new BufferedReader(new FileReader("SFile.txt")); //SFile.txt is the file that has the messsage that I need to take the location for the specific characters
int nn = Integer.parseInt(line);
s = bufrd.readLine();
System.out.println("The Location " + nn + " is : "+ s.charAt(nn)); // read the character that has this location
lineNumb++;
}catch(IOException e){
System.out.println("Line 334");
}
}
}
}
myFile.close();
}
Is it possible to guide me on how I can solve the exception?
I appreciate any help you can provide.
Here is the solution ...
int n;
String s;
int lineNumCount = 0;
String coverText = stegoMsg.getText(); // get the stego text from the textfield
int k = coverText.length(); // get the length for the stego text
int lineNumb = 1;
Scanner myFile = null;
try{
Scanner file = new Scanner(new File("location.txt"));
myFile = file;
}catch (FileNotFoundException e){
System.out.println("File does not found");
}
try{
while (myFile.hasNext()){
//Count the Number of the lines in location.txt
//1. Read the File
File fileLocation = new File("C:\\Users\\Farah\\Dropbox\\Steganography codes\\NewStegoTech\\location.txt");
if(fileLocation.exists()){
try {
FileReader fr = new FileReader(fileLocation);
LineNumberReader lr = new LineNumberReader(fr); //2. Read the lines for location.txt
while((lr.readLine()) !=null){
lineNumCount++;
}
} catch (FileNotFoundException ex) {
Logger.getLogger(ExtPage.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(ExtPage.class.getName()).log(Level.SEVERE, null, ex);
}
try{
String line = Files.readAllLines(Paths.get("location.txt")).get(lineNumb);
// System.out.println("Line First " + line);
BufferedReader bufrd = new BufferedReader(new FileReader("Stego File.txt"));
int nn = Integer.parseInt(line);
s = bufrd.readLine();
System.out.println("The Loocation " + nn + " is : "+ s.charAt(nn)); // read the character that has this location
lineNumb++;
}catch(IOException e){
System.out.println(e);
}
}
}
}catch(IndexOutOfBoundsException e)
{
System.out.println("Finish reading file");
}
myFile.close();
Related
copy part like this(from date to date) I am trying to copy only a part of .CSV file based on the first column (Start Date and Time) data looks like (2019-01-28 10:22:00 AM) but the user have to put it like this (2019/01/28 10:22:00)
this is for windows, java opencsv , this is what I found but dont do what I need exaclty :
like this:
int startLine = get value1 from column csv ;
int endLine = get value2 from column csv;
public static void showLines(String fileName, int startLine, int endLine) throws IOException {
String line = null;
int currentLineNo = 1;
// int startLine = 20056;//40930;
// int currentLineNo = 0;
File currentDirectory = new File(new File(".").getAbsolutePath());
String fromPath = currentDirectory.getCanonicalPath() + "\\Target\\part.csv";
PrintWriter pw = null;
pw = new PrintWriter(new FileOutputStream(fromPath), true);
//pw.close();
BufferedReader in = null;
try {
in = new BufferedReader (new FileReader(fileName));
//read to startLine
while(currentLineNo<startLine) {
if (in.readLine()==null) {
// oops, early end of file
throw new IOException("File too small");
}
currentLineNo++;
}
//read until endLine
while(currentLineNo<=endLine) {
line = in.readLine();
if (line==null) {
// here, we'll forgive a short file
// note finally still cleans up
return;
}
System.out.println(line);
currentLineNo++;
pw.println(line);
}
} catch (IOException ex) {
System.out.println("Problem reading file.\n" + ex.getMessage());
}finally {
try { if (in!=null) in.close();
pw.close();
} catch(IOException ignore) {}
}
}
public static void main(String[] args) throws FileNotFoundException {
int startLine = 17 ;
int endLine = 2222;
File currentDirectory = new File(new File(".").getAbsolutePath());
try {
showLines(currentDirectory.getCanonicalPath() + "\\Sources\\concat.csv", startLine, endLine);
} catch (IOException e) {
e.printStackTrace();
}
// pw.println();
}
Common CSV format uses a comma as a delimiter, with quotations used to escape any column entry that uses them within the data. Assuming that your column one data is consistent with the format you posted, and that I wouldn't have to bother with quotations marks therefor, you could read the columns as:
public static void main(String[] args) {
//This is the path to the file you are writing to
String targetPath = "";
//This is the path to the file you are reading from
String inputFilePath = "";
String line = null;
ArrayList<String> lines = new ArrayList<String>();
boolean add = false;
String startLine = "2019/01/28 10:22:00";
String endLine = "2019/01/28 10:30:00";
String addFlagSplit[] = startLine.replace("/", "-").split(" ");
String addFlag = addFlagSplit[0] + " " + addFlagSplit[1];
String endFlagSplit[] = endLine.replace("/", "-").split(" ");
String endFlag = endFlagSplit[0] + " " + endFlagSplit[1];
try(PrintWriter pw = new PrintWriter(new FileOutputStream(targetPath), true)){
try (BufferedReader input = new BufferedReader(new FileReader(inputFilePath))){
while((line = input.readLine()) != null) {
String date = line.split(",")[0];
if(date.contains(addFlag)) {
add = true;
}else if(date.contains(endFlag)) {
break;
}
if(add) {
lines.add(line);
}
}
}
for(String currentLine : lines) {
pw.append(currentLine + "\n");
}
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
File currentDirectory = new File(new File(".").getAbsolutePath());
String targetPath = currentDirectory.getCanonicalPath() + "\\Target\\part.csv";
String inputFilePath = currentDirectory.getCanonicalPath() + "\\Sources\\concat.csv";
String line = null;
ArrayList<String> lines = new ArrayList<String>();
boolean add = false;
String startLine = "2019/01/28 10:22:00";
String endLine = "2019/04/06 10:30:00";
try(PrintWriter pw = new PrintWriter(new FileOutputStream(targetPath), true)){
try (BufferedReader input = new BufferedReader(new FileReader(inputFilePath))){
while((line = input.readLine()) != null) {
String date = line.split(",")[0];
if(date.contains(startLine)) {
add = true;
}else if(date.contains(endLine)) {
break;
}
if(add) {
lines.add(line);
}
}
}
for(String currentLine : lines) {
pw.append(currentLine + "\n");
}
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}
}
I am working on a program which imports a library from a generated file.
The file generates properly and is found by Scanner. The first line has a single int as written by
pw.println(cdarchive.getNumber());
Elsewhere in the code. This part seems to work fine.
This is the error I'm getting:
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at no.hib.dat102.IO.readFile(IO.java:26)
at no.hib.dat102.Menu.start(Menu.java:34)
at no.hib.dat102.CdArchiveClient.main(CdArchiveClient.java:10)
The line it refers to is
int libSize = in.nextInt();
This is my method:
public class IO {
static final String DELIMITER = "#";
public static CdArchiveADT readFile(String filename) {
Scanner in = null;
CdArchiveADT cda = null;
try
{
File f = new File(filename+".txt");
in = new Scanner(f);
System.out.println(f);
in.useDelimiter(DELIMITER);
int libSize = in.nextInt();
System.out.println("libSize" + libSize);
cda = new CdArchive(libSize);
for (int i=0; i<libSize;i++) {
int inId = in.nextInt();
String inTitle= in.next();
String inArtist = in.next();
String inLabel = in.next();
String inGenre = in.next();
int inYear = in.nextInt();
in.nextLine();
cda.addCd(new CD(inId, inArtist, inTitle, inYear, inGenre, inLabel));
System.out.println("Closing Scanner (input)");
in.close();
}
}
catch (FileNotFoundException e){
System.out.println("Config file not found!");
e.printStackTrace();
}
return cda;
}
EDIT:
This is the method that writes to the file:
public static void writeFile(CdArchiveADT cdarchive, String filename) throws IOException {
PrintWriter pw = null;
File file = null;
try {
file = new File(filename +".txt");
// Create the file if it does not already exist
file.createNewFile();
// Writing metadata
pw = new PrintWriter(new FileWriter(file, false));
pw.println(cdarchive.getNumber());
// Writing data, if CdArchive is not empty
if (cdarchive.getCdTable()[0] != null) {
for (int i = 0; i<cdarchive.getNumber(); i++ ) {
CD c = cdarchive.getCdTable()[i];
pw.print(c.getId()); pw.print(DELIMITER);
pw.print(c.getTitle()); pw.print(DELIMITER);
pw.print(c.getArtist()); pw.print(DELIMITER);
pw.print(c.getLabel()); pw.print(DELIMITER);
pw.print(c.getGenre()); pw.print(DELIMITER);
pw.print(c.getYear()); pw.println(DELIMITER);
}
}
}
catch (FileNotFoundException e)
{
System.out.println("File not found!");
e.printStackTrace();
}
finally
{
if ( pw != null )
{
System.out.println("Closing PrintWriter");
pw.close();
}
}
}
I got a working example:
public static void main(String[] args) {
// write
String delimiter = "#";
StringWriter stringWriter = new StringWriter();
PrintWriter pw = new PrintWriter(stringWriter);
pw.println(3);
for (int i = 0; i < 3; i++) {
pw.print("id " + i);
pw.print(delimiter);
pw.print("titel " + i);
pw.print(delimiter);
pw.print("artist " + i);
pw.println(delimiter);
}
String theString = stringWriter.toString();
System.out.println(theString);
try {
pw.close();
stringWriter.close();
} catch (IOException e) {
// ignore in example
}
// read
Scanner in = new Scanner(theString);
in.useDelimiter("\\s*#\\s*|\\s*\n\\s*"); // add new line as delimiter aswell
int libSize = in.nextInt();
for (int i = 0; i < libSize; i++) {
String inId = in.next();
String inTitle = in.next();
String inArtist = in.next();
in.nextLine();
System.out.println("read: " + inId + ", " + inTitle + ", " + inArtist);
}
in.close();
}
The point is to add new line to the used delimiters aswell
try to use
static final String DELIMITER = "\\s*#\\s*";
Otherwise any leading or trailing spaces will cause that error.
This program is meant to see two files located in a particular folder and then merge those two files and create a third file which is does. From the third merged file it is then searching for a keyword such as "test", once it finds that key word it prints out the location and the line of the keyword which is what is somewhat doing. What is happening is when I run the program it stops after the finds the keyword the first time in a line but it will not continue to search that line. So if there is multiple keyword 'test' in the line it will only find the first one and spit back the position and line. I want it to print both or multiple keywords. I think it is because of the IndexOf logic which is causing the issue.
import com.sun.deploy.util.StringUtils;
import java.io.*;
import java.lang.*;
import java.util.Scanner;
public class Concatenate {
public static void main(String[] args) {
String sourceFile1Path = "C:/Users/me/Desktop/test1.txt";
String sourceFile2Path = "C:/Users/me/Desktop/test2.txt";
String mergedFilePath = "C:/Users/me/Desktop/merged.txt";
File[] files = new File[2];
files[0] = new File(sourceFile1Path);
files[1] = new File(sourceFile2Path);
File mergedFile = new File(mergedFilePath);
mergeFiles(files, mergedFile);
stringSearch(args);
}
private static void mergeFiles(File[] files, File mergedFile) {
FileWriter fstream = null;
BufferedWriter out = null;
try {
fstream = new FileWriter(mergedFile, true);
out = new BufferedWriter(fstream);
} catch (IOException e1) {
e1.printStackTrace();
}
for (File f : files) {
System.out.println("merging: " + f.getName());
FileInputStream fis;
try {
fis = new FileInputStream(f);
BufferedReader in = new BufferedReader(new InputStreamReader(fis));
String aLine;
while ((aLine = in.readLine()) != null) {
out.write(aLine);
out.newLine();
}
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private static void stringSearch(String args[]) {
try {
String stringSearch = "test";
BufferedReader bf = new BufferedReader(new FileReader("C:/Users/me/Desktop/merged.txt"));
int linecount = 0;
String line;
System.out.println("Searching for " + stringSearch + " in file");
while (( line = bf.readLine()) != null){
linecount++;
int indexfound = line.indexOf(stringSearch);
if (indexfound > -1) {
System.out.println(stringSearch + " was found at position " + indexfound + " on line " + linecount);
System.out.println(line);
}
}
bf.close();
}
catch (IOException e) {
System.out.println("IO Error Occurred: " + e.toString());
}
}
}
It's because you are searching for the word once per line in your while loop. Each iteration of the loop takes you to the next line of the file because you are calling bf.readLine(). Try something like the following. You may have to tweak it but this should get you close.
while (( line = bf.readLine()) != null){
linecount++;
int indexfound = line.indexOf(stringSearch);
while(indexfound > -1)
{
System.out.println(stringSearch + " was found at position " + indexfound + " on line " + linecount);
System.out.println(line);
indexfound = line.indexOf(stringSearch, indexfound);
}
}
I'm trying to make a file delete after it has 20 characters in it. I have looked at every single Stack Overflow question about this, and no answer worked. I have looked every where, and nothing works. File.delete(); does not work for me. It writes a file, and every time a button is pressed it adds a "1" to it. If there are 20 1's, than it needs to delete the file.
Sample Code:
String fileName1 = "data1.txt";
try {
FileWriter fw = new FileWriter(fileName1, true);
try (BufferedWriter bw = new BufferedWriter(fw)) {
bw.write("1");
bw.close();
} catch (IOException ex) {
Logger.getLogger(StudentRandomizerJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (IOException ex) {
Logger.getLogger(StudentRandomizerJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
try {
Scanner scanner = new Scanner(new FileReader("data1.txt"));
String scannerData1 = scanner.nextLine();
if (scannerData1.equals("11111111111111111111")) {
//In here is where its supposed to delete the file.
}
} catch (FileNotFoundException ex) {
Logger.getLogger(StudentRandomizerJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
Seems to work okay for me...
for (int index = 0; index < 50; index++) {
String fileName1 = "data1.txt";
try (BufferedWriter bw = new BufferedWriter(new FileWriter(fileName1, true))) {
bw.write("1");
} catch (IOException ex) {
ex.printStackTrace();
}
boolean deleteMe = false;
try (Scanner scanner = new Scanner(new FileReader("data1.txt"))) {
String scannerData1 = scanner.nextLine();
if (scannerData1.length() >= 20) {
deleteMe = true;
}
} catch (IOException ex) {
ex.printStackTrace();
}
if (deleteMe) {
File file = new File(fileName1);
if (!file.delete()) {
System.out.println("!! Could not delete " + file);
} else {
System.out.println(file + " was deleted");
}
System.out.println(file + " exists = " + file.exists());
}
}
Prints
data1.txt was deleted
data1.txt exists = false
data1.txt was deleted
data1.txt exists = false
Maybe you need to check to see if you have the correct permissions to delete the file (but if you have write permissions, you should be able to delete it) and you're deleting the file you think you're deleting
I will try to explain this as much as I can. I am reading scores from a file onto which my form appends lines. The line consists of a date, home team, score, away team, score.
The stats I gather is away wins, home wins and draws.
The following code works perfectly
JButton viewStatsButton = new JButton(new AbstractAction("VIEW STATS")
{
public void actionPerformed( ActionEvent e )
{
int homeScore = 0;
int awayScore = 0;
int homeWins = 0;
int awayWins = 0;
int scoreDraw = 0;
String line = null;
String output;
String matchDay;
#SuppressWarnings("unused")
String homeTeam;
#SuppressWarnings("unused")
String awayTeam;
String file = "scores.dat";
StringTokenizer tokenizer;
FileReader fileReader = null;
try
{
fileReader = new FileReader (file);
}
catch (FileNotFoundException e1)
{
e1.printStackTrace();
}
BufferedReader inFile = new BufferedReader (fileReader);
try
{
line = inFile.readLine();
}
catch (IOException e1)
{
e1.printStackTrace();
}
while(line != null)
{
tokenizer = new StringTokenizer(line);
matchDay = tokenizer.nextToken();
homeTeam = tokenizer.nextToken();
try
{
homeScore = Integer.parseInt(tokenizer.nextToken());
}
catch (NumberFormatException exception)
{
System.out.println("Error in input. Line ignored:");
System.out.println(line);
}
awayTeam = tokenizer.nextToken();
try
{
awayScore = Integer.parseInt(tokenizer.nextToken());
}
catch (NumberFormatException exception)
{
System.out.println("Error in input. Line ignored:");
System.out.println(line);
}
if(homeScore > awayScore)
{
homeWins++;
}
else if(awayScore > homeScore)
{
awayWins++;
}
else
{
scoreDraw++;
}
try
{
line = inFile.readLine();
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
try
{
inFile.close();
}
catch (IOException e1)
{
e1.printStackTrace();
}
output = "Home Wins : "+homeWins+"\nAway Wins : "+awayWins+"\nDraws : "+scoreDraw;
JTextArea textArea = new JTextArea();
frame.getContentPane().add(textArea, BorderLayout.CENTER);
textArea.setText(output);
}
});
scorePanel.add(viewStatsButton);
}
The problem does not come to light until the name of team is made out of two strings i.e.Newcastle United. What I had to do was append the two strings together like NewcastleUnited. I have tried to find out the length of the token and if it's less than 3 then i take it and parse it as integer but it seems that even if the next token reference is in an if statement it still moves to the token after it.
I would appreciate any help and guidance.
Try following
Before calling tokenizer.nextToken() check tokenizer.hasMoreTokens() to ensure that there is a token to read
if(tokenizer.hasMoreTokens())
{
x = tokenizer.nextToken();
}
After reading team name(first part) check whether next part is integer if it is, treat it as score, otherwise append it to team name.
homeTeam = tokenizer.nextToken();
String temp = tokenizer.nextToken();
try
{
homeScore = Integer.parseInt(temp);
}
catch(Exception e)
{
//Comes here if temp is not an integer, so temp is second part of name
homeTeam = homeTeam + " "+temp;
homeScore = Integer.parseInt(tokenizer.nextToken());
}
//Whatever the case, if we come here, it means both hometeam and score are assigned.
...........
...........
...........
Don't forgot to check tokenizer.hasMoreTokens() if you are not sure whether there is a token.