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how to copy only a part of .CSV based on first column elements with java

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();
}
}

PrintWriter.println - works - but not print?

i have a really suspicious case here, envolving a simple method which is supposed to write into a .txt file.
public void extractCoNLL(int n, String outputFile) throws IOException {
String msg;
PrintWriter pr = new PrintWriter(outputFile);
FileInputStream fConlliN = new FileInputStream(this.txt_CoNLL_in);
BufferedReader readBufferData = new BufferedReader(new InputStreamReader(fConlliN));
try {
while ((msg = readBufferData.readLine()) != null) {
String aMsg[] = msg.split("\\s+");
if (!msg.startsWith("#")) {
//pr.println(msg);
if (aMsg.length >= n) {
pr.print(aMsg[n] + "_"); // DOES NOT WORK
pr.println(aMsg[n] + "_"); // WORKS ?????
System.out.println(aMsg[4] + aMsg.length);
} else {
pr.println();
}
}
}
this.txt_CoNLL = out_Extracted_txt_CoNLL;
} catch (Exception e) {
System.err.println("Error Exception: " + e.getMessage());
}
}
Also, why is it not possible for me to add a simple " " -space but i have to be forced to use "_" to seperate the words.
Very grateful for your Help.
Thank you in advance!

Debugging File Search / Merge Code

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);
}
}

Display searched text with line numbers in a text file

So I've been working on a program that will display the line number and the line itself of the searched text string. If I search dog, and I have lines in my text file that contain the word dog, those lines and line numbers should be shown. I also have created a method that counts the characters, words, and lines of a text file. However, the problem I am having is that whenever I run my program I don't get the line numbers with the lines of the searched text. I successfully get the text from the text file in the console and I successfully get the number of lines, words, etc.
Here's my written code, I am guessing it has to do something with the fact that I don't have a "return results;" statement, but I am not sure where to put it, and if I add it to the end of "+ characters + " characters. "" line by doing "+ results", it just gives me empty brackets.
Maybe I am doing something wrong? Perhaps something to do with closing the file and stream, not sure. Please help, I've tried moving stuff around but no luck.
public String words() {
try {
int words = 0;
int numbers = 0;
int lines = 1;
int characters = 0;
int total = 0;
String c = " ";
FileReader r = new FileReader(file1);
LineNumberReader lnr = new LineNumberReader(r);
StreamTokenizer t = new StreamTokenizer(r);
ArrayList<String> results = new ArrayList<String>();
t.resetSyntax();
t.wordChars('0', '9');
t.wordChars('A', 'Z');
t.wordChars('a', 'z');
t.whitespaceChars(0, ' ');
t.eolIsSignificant(true);
while (t.nextToken() != StreamTokenizer.TT_EOF) {
switch (t.ttype) {
case StreamTokenizer.TT_NUMBER:
numbers++;
break;
case StreamTokenizer.TT_WORD:
characters += t.sval.length();
words++;
break;
case StreamTokenizer.TT_EOL:
lines++;
break;
case StreamTokenizer.TT_EOF:
break;
default:
}
}
FileInputStream fstream = new FileInputStream(file1);
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
while ((strLine = br.readLine()) != null) {
System.out.println(strLine);
}
br.close();
String ask = "Enter Word";
String find = JOptionPane.showInputDialog(ask);
String word = find;
String line = null;
while ((line = lnr.readLine()) != null) {
if (line.indexOf(word) >= 0) {
results.add(lnr.getLineNumber() + line);
}
}
r.close();
total = numbers + words;
lnr.close();
return file1.getName() + " has " + lines + " lines, "
+ total + " words, "
+ characters + " characters. ";
} catch (IOException e) {
display(e.toString(), "Error");
}
return " ";
}
Here's the main class if needed:
import java.io.*;
import java.util.ArrayList;
import javax.swing.*;
public class BasicFile {
File file1;
JFileChooser selection;
File file2 = new File(".", "Backup File");
public BasicFile() {
selection = new JFileChooser(".");
}
public void selectFile() {
int status = selection.showOpenDialog(null);
try {
if (status != JFileChooser.APPROVE_OPTION) {
throw new IOException();
}
file1 = selection.getSelectedFile();
if (!file1.exists()) {
throw new FileNotFoundException();
}
} catch (FileNotFoundException e) {
JOptionPane.showMessageDialog(null, "File Not Found ", "Error", JOptionPane.INFORMATION_MESSAGE);
} catch (IOException e) {
System.exit(0);
}
}
public void backupFile() throws FileNotFoundException {
DataInputStream in = null;
DataOutputStream out = null;
try {
in = new DataInputStream(new FileInputStream(file1));
out = new DataOutputStream(new FileOutputStream(file2));
try {
while (true) {
byte data = in.readByte();
out.writeByte(data);
}
} catch (EOFException e) {
JOptionPane.showMessageDialog(null, "File has been backed up!",
"Backup Complete!", JOptionPane.INFORMATION_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "File Not Found ",
"Error", JOptionPane.INFORMATION_MESSAGE);
}
} finally {
try {
in.close();
out.close();
} catch (Exception e) {
display(e.toString(), "Error");
}
}
}
boolean exists() {
return file1.exists();
}
public String toString() {
return file1.getName() + "\n" + file1.getAbsolutePath() + "\n" + file1.length() + " bytes";
}
public String words() {
try {
int words = 0;
int numbers = 0;
int lines = 1;
int characters = 0;
int total = 0;
String c = " ";
FileReader r = new FileReader(file1);
LineNumberReader lnr = new LineNumberReader(r);
StreamTokenizer t = new StreamTokenizer(r);
ArrayList<String> results = new ArrayList<String>();
t.resetSyntax();
t.wordChars('0', '9');
t.wordChars('A', 'Z');
t.wordChars('a', 'z');
t.whitespaceChars(0, ' ');
t.eolIsSignificant(true);
while (t.nextToken() != StreamTokenizer.TT_EOF) {
switch (t.ttype) {
case StreamTokenizer.TT_NUMBER:
numbers++;
break;
case StreamTokenizer.TT_WORD:
characters += t.sval.length();
words++;
break;
case StreamTokenizer.TT_EOL:
lines++;
break;
case StreamTokenizer.TT_EOF:
break;
default:
}
}
FileInputStream fstream = new FileInputStream(file1);
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
while ((strLine = br.readLine()) != null) {
System.out.println(strLine);
}
br.close();
String ask = "Enter Word";
String find = JOptionPane.showInputDialog(ask);
String word = find;
String line = null;
while ((line = lnr.readLine()) != null) {
if (line.indexOf(word) >= 0) {
results.add(lnr.getLineNumber() + line);
}
}
r.close();
total = numbers + words;
lnr.close();
return file1.getName() + " has " + lines + " lines, "
+ total + " words, "
+ characters + " characters. ";
} catch (IOException e) {
display(e.toString(), "Error");
}
return " ";
}
void display(String msg, String s) {
JOptionPane.showMessageDialog(null, msg, s, JOptionPane.ERROR_MESSAGE);
}
}

You are nearly there.
reinitialize your FileReader and LineNumberReader before your while ((line = lnr.readLine()) != null) loop.
Then your ArrayList will be full of the #String that I think you desire.

what you can do is start counting the lines in the file (starting by 0), then increase by 1 every time a new line is found.. then check if the string you want to find is contained in the line, then print the number of the line where the keyword is found (using the contains() function in Java). I assumed you want to check for both upper and lower case, if you don't want that then simply remove the toLowerCase() ! So, read the file properly in Java:
long lineNumber = 0;
BufferedReader myReader = new BufferedReader(new FileReader("test.txt"));
String line = myReader.readLine();
while(line != null){
lineNumber++;
System.out.println("The line I am now examining is : " + line + " and the line number is : " + lineNumber);
if line.toLowerCase().contains(word.toLowerCase()) {
System.out.println("Line number: " + lineNumber + " contains keyword : " + word);
line = myReader.readLine();
}

Checking input format

I have a program I'm writing for class, and I'm stuck on the very last part. Here's what it requests, and what I'm stuck at:
Display an error if the file does not exist or the format is
incorrect.
The formatting of the input is along the lines of:
Name;Service;Price;Date
or
Bob Smith;Dinner;52.35;04-01-2014
And my code so far:
package school;
import java.util.*;
import java.io.*;
public class HotelSales{
public static void main(String[] args){
try {
BufferedReader br = new BufferedReader(new FileReader("input.txt"));
// I assume the format check would go here?
String[] array = new String[48];
double conferenceTotal = 0;
double dinnerTotal = 0;
double lodgingTotal = 0;
String line = "";
while((line = br.readLine()) != null){
array = line.split(";");
if(array[1].equals("Conference")) {
conferenceTotal += Double.parseDouble(array[2]);
} else if(array[1].equals("Dinner")) {
dinnerTotal += Double.parseDouble(array[2]);
} else if(array[1].equals("Lodging")) {
lodgingTotal += Double.parseDouble(array[2]);
}
}
System.out.println("The totals for the sales are: \n");
System.out.printf("Conference Total: $%-5.2f\n", conferenceTotal);
System.out.printf("Dinner Total: $%-5.2f\n", dinnerTotal);
System.out.printf("Lodging Total: $%-5.2f\n", lodgingTotal);
BufferedWriter bw = new BufferedWriter(new FileWriter("output.txt"));
bw.write("The totals for the sales are: ");
bw.newLine();
bw.newLine();
bw.write("Conference Total: $" + String.format("%-5.2f",conferenceTotal));
bw.newLine();
bw.write("Dinner Total: $" + String.format("%-5.2f",dinnerTotal));
bw.newLine();
bw.write("Lodging Total: $" + String.format("%-5.2f",lodgingTotal));
br.close();
bw.close();
} catch (InputMismatchException e) { //And that this is the proper catch right?
System.out.print("Wrong input file format.\n");
e.printStackTrace();
} catch (FileNotFoundException e) {
System.out.print("Sorry, the file was not found.\n");
e.printStackTrace();
} catch (IOException e) {
System.out.print("Oops! I/O Exception.\n");
e.printStackTrace();
}
}
}
Thanks! :)

this should work:
while((line = br.readLine()) != null){
String [] array = line.split(";");
if ( array.length != 4 ) {
throw new InputMismatchException( "Invalid ... blah blah, expected 4 elements, found " + array.length );
}
try {
if(array[1].equals("Conference")) {
conferenceTotal += Double.parseDouble(array[2]);
} else if(array[1].equals("Dinner")) {
dinnerTotal += Double.parseDouble(array[2]);
} else if(array[1].equals("Lodging")) {
lodgingTotal += Double.parseDouble(array[2]);
}
} catch ( NumberFormatException nfe ) {
throw new InputMismatchException( nfe );
}
}
and remove the line:
String[] array = new String[48];

If your input file is not separated by ;'s, then when you attempt to Double.parseDouble(array[2]), you'll get an ArrayIndexOutOfBoundsException or a NullPointerException because your array will be of size 1.
while ((line = br.readLine()) != null)
{
array = line.split(";");
if (array.length != 4)
{
throw new InputMismatchException("Invalid ... blah blah, expected 4 elements, found " + array.length);
}
try
{
if (array[1].equals("Conference"))
{
conferenceTotal += Double.parseDouble(array[2]);
}
else if (array[1].equals("Dinner"))
{
dinnerTotal += Double.parseDouble(array[2]);
}
else if (array[1].equals("Lodging"))
{
lodgingTotal += Double.parseDouble(array[2]);
}
}
catch (ArrayIndexOutOfBoundsExceptione aioobe)
{
throw new InputMismatchException(aioobe);
}