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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??

AutoIndent bracket in Java Swing JeditorPane

I am working on a code-editor in java and i want to know how to auto-indent using brackets (open and close) like an actual code editor .
like this 1:
Array PrincipalVar = (Var => (OtherVar => (var3 => 3,
var4 => 8,
var6 => 1)
),
Var2 => (var => 1))
Editor is a JEditorPane. I tried some code, but nothing seem to work.
I have already file contening code, and I want to Re-Indent this file.
Code I already tried :
public String indentFileTry() throws FileNotFoundException{
LinkedList<Integer> inBracket = new LinkedList<Integer>();
String currentLine = "";
Scanner indent = new Scanner(new FileReader(f));
String ptu = "";
while(indent.hasNextLine()) {
currentLine = indent.nextLine();
currentLine = currentLine.trim();
char[] line = currentLine.toCharArray();
int i = 0;
while(i < line.length){ //Here I define the position of the Bracet for Indentation
if(line[i] == '('){
inBracket.addFirst(i);
}
i++;
}
if(!inBracket.isEmpty()){//here I indent with the position of the bracket and I remove the first(First In First Out)
if(!currentLine.contains(")")){
int spaceadded = 0;
String space ="";
while(spaceadded <= inBracket.getFirst()){
spaceadded++; space += " ";
}
currentLine = space + currentLine;
inBracket.removeFirst();
}else if(currentLine.contains(")")){
int spaceadded = 0;
String space ="";
while(spaceadded <= inBracket.getFirst()){
spaceadded++; space += " ";
}
currentLine = space + currentLine;
inBracket.removeFirst();
}
}
ptu += currentLine +"\n";
}
indent.close() ;
System.out.println(ptu);
return ptu;
}

If you expect automatically indentation you won't get such code. You should implement it yourself adding \n spaces (or \t) chars to format your code. JEditorPane does not understand your code logic. You (with your code parser) should define parent/child relation for lines of code you have.
One example for the case when parent/children are defined is XML. See the XMLEditorKit where nodes are indented.

For the response, What I do is easy.
I made a LinkedList, and I use it like a FILO (First in Last out) like this :
public String indentFile() throws FileNotFoundException{
LinkedList<Integer> positionBracket = new LinkedList<Integer>();
String currentLine = "";
Scanner indent = new Scanner(new FileReader(f));
String stringIndented = "";
while(indent.hasNextLine()) {
currentLine = indent.nextLine();
currentLine = currentLine.trim();
char[] lineInChar = currentLine.toCharArray();
int i = 0;
int spaceadded = 0;
String space ="";
if(!positionBracket.isEmpty()){
while(spaceadded <= positionBracket.getFirst()){
spaceadded++;
space += " "; // We put same space like the last opened bracket
}
}
while(i < lineInChar.length){
if(lineInChar[i] == '('){ //If opened bracket I put the position in the top of the Filo
positionBracket.addFirst(new Integer(i));
}
if(lineInChar[i] == ')' && !countCom){
positionBracket.removeFirst(); //If closed bracket I remove the position on the top of the Filo
}
i++;
}
stringIndented += space + currentLine +"\n";
}
}
return stringIndented;
}

Java StringTokenizer running out of bounds with .CSV file

I am trying to read a simple .CSV file and create a 2D array of Strings. Here is the array:
1,1,1,1,1,1
2,2,2,2,2,2
3,3,3,3,3,3
4,4,4,4,4,4
My code is supposed to find six columns and four rows, but it stops after the third column and moves on to the next row and I cannot figure out why this is happening.
In addition to this, it returns an out of bounds exception even though it quits early.
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 6
Here is the code and it is followed by the output.
public String[][] ascToStringArray(String ascFileIn) {
String directory ="c:\\data\\"; // "\" is an illegal character
String[][] numbers= new String[4][6]; // 4 rows 6 columns
try{
BufferedReader Br = new BufferedReader(new FileReader(directory + ascFileIn));
String line;
int row = 0;
int col = 0;
//read each line of text file
while((line = Br.readLine()) != null)
{
StringTokenizer st = new StringTokenizer(line,",");
//Populating Columns
while (st.hasMoreTokens())
{
//get next token and store it in the array
numbers[row][col] = st.nextToken();
System.out.println(row + " " + col + " = " + st.nextToken());
col++;
}
row++;
}
//close the file
Br.close();
return numbers;
}
catch(IOException exc) {
System.out.println("Error reading file.");
return numbers;
}
}
Here is the output:
0 0 = 1
0 1 = 1
0 2 = 1
1 3 = 2
1 4 = 2
1 5 = 2
If anyone can figure out why it is quitting early and throwing me an out of bounds error no matter how large I make the array I would really appreciate it.

You are using nextToken twice.
numbers[row][col] = st.nextToken();<-1---
System.out.println(row + " " + col + " = " + st.nextToken());<--2--Skips element
But using only one value so in one row only three element of line will be added.
Reason of Exception
You are not resetting the col=0 after the execution of inner while loop which leads to ArrayIndexOutOfBound for col=6 as col size in array is 6 means 0 to 5 so will throw exception when col=6.

Firstly the system.out.println inside the inner while loop consumes a token.. Second on entring the inner while loop you should reset the cols files. to zero.
public String[][] ascToStringArray(String ascFileIn) {
String directory = "c:\\data\\"; // "\" is an illegal character
String[][] numbers = new String[4][6]; // 4 rows 6 columns
try {
BufferedReader Br = new BufferedReader(new FileReader(directory + ascFileIn));
String line;
int row = 0;
int col = 0;
// read each line of text file
while ((line = Br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line, ",");
col = 0;
// Populating Columns
while (st.hasMoreTokens()) {
// get next token and store it in the array
numbers[row][col] = st.nextToken();
col++;
}
row++;
}
// close the file
Br.close();
return numbers;
} catch (IOException exc) {
System.out.println("Error reading file.");
return numbers;
}
}

It's because you are calling st.nextToken() twice, swallowing an extra token in your System.out.println.
Instead, first save it into a String:
String token = st.nextToken();
then you can use the same String in your print and for the array.

http://msdn.microsoft.com/fr-fr/library/aa989865(v=vs.80).aspx
StringTokenizer.nextToken () : Gets the next token in the string
during parsing.
numbers[row][col] = st.nextToken();
System.out.println(row + " " + col + " = " + st.nextToken());
You go through your tokens without using them !

Java Log File Reader, charAt() String index out of range

I have a problem.
I want to make a programm, that takes a Log File and parse it line for line.
A Log looks like this:
"2014-02-14 14:26:37,836 INFO [org.jboss.msc] (main) JBoss MSC
version 1.0.4.GA-redhat-1"
My code:
public static void main(String[] args) throws InterruptedException {
try
{
String sCurrentLine;
BufferedReader br = new BufferedReader(new FileReader("C:\\server.log"));
while ((sCurrentLine = br.readLine()) != null) {
String datetime = "";
String level = "";
String category = "";
String message = "";
String output = "";
if(sCurrentLine.length()<1){
}
else{
if (sCurrentLine.charAt(4)=='-' && sCurrentLine.charAt(7)=='-' && sCurrentLine.charAt(13)==':' && sCurrentLine.charAt(16)==':'){
String[] leerzeichen = sCurrentLine.split(" ");
String[] leerzeichenz = sCurrentLine.split(" ");
datetime = leerzeichen[0] + " " + leerzeichen[1];
level = leerzeichen[2];
category = leerzeichen[4];
int arraylength = leerzeichen.length;
for (int l=5; l<arraylength; l++){
message = message.concat(leerzeichen[l] + " ");
}
output = datetime + level + category + message;
} else {
message = message.concat(sCurrentLine);
output += message;
}
}
System.out.println(output);
}
} catch (IOException e) {
e.printStackTrace();
}
}
The Program looks, if the beginning of the Line looks like this: 0000-00-00 00:00:00
If not, the Line is only a message in connection with the line before.
But I always get the Error:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 4
at java.lang.String.charAt(String.java:658)
at javaapplication5.JavaApplication5.main(JavaApplication5.java:38)
But he reads some lines of the log. But not until the end of the log.
Can you help me? sorry for my English.

You have problem in line:
if (sCurrentLine.charAt(4)=='-' && sCurrentLine.charAt(7)=='-' && sCurrentLine.charAt(13)==':' && sCurrentLine.charAt(16)==':'){
You cannot assume that the line have at least 4, 7 or more characters.
Try changing it to this:
if (sCurrentLine.length() >= 16 && sCurrentLine.charAt(4)=='-' && sCurrentLine.charAt(7)=='-' && sCurrentLine.charAt(13)==':' && sCurrentLine.charAt(16)==':'){

The cause of error is quite straight forward; you first check if string has length > 1, and then directly ask for char at index 4 -- which is no guarantee to exists since all you know is thats length > 1.
Hence, add proper checking before trying to access char at index 4, and most of all, as said in comment by #VusP, add some print/debugging of the read string before trying to parse it.

How to read data from a specific column from csv file using jsp/java?

In my application I need to read a specific column of tab separated csv file using jsp. But I can read the data of full row not a specific column.
I need help this regard. Please help me
Thanks
mycode:
<%# page import="java.io.*"%>
<html>
<body>
<%
String fName = "c:\\csv\\myfile.csv";
String thisLine;
int count=0;
FileInputStream fis = new FileInputStream(fName);
DataInputStream myInput = new DataInputStream(fis);
int i=0;
%>
<table>
<%
while ((thisLine = myInput.readLine()) != null)
{
String strar[] = thisLine.split(",");
for(int j=0;j<strar.length;j++)
{
if(i!=0)
{
out.print(" " +strar[j]+ " ");
}
else
{
out.print(" <b>" +strar[j]+ "</b> ");
}
}
out.println("<br>");
i++;
}
%>
</table>
</body>
</html>

I don't think you can read specific column.Better to read entire row using CSVParser or you can read CSV line by line and split it and get String array then you can get specific column but yes you need to read whole row gain.
Try it.
String fName = "C:\\Amit\\abc.csv";
String thisLine;
int count = 0;
FileInputStream fis = new FileInputStream(fName);
DataInputStream myInput = new DataInputStream(fis);
int i = 0;
while ((thisLine = myInput.readLine()) != null) {
String strar[] = thisLine.split(",");
System.out.println(strar[3]);
// Here column 2
}
}
By this way you can read specific column.

I had a similar problem in Objective C the other day, but this is how I solved it.
This method assumes you know the column number of the data you want. (I.E. if you want column 1 of 6)
Read all the rows into strings and append them into one.
Data sample: (columns 1 to 6)
1,2,3,4,5,6
13,45,63,29,10,8
11,62,5,20,13,2
String 1 = 1,2,3,4,5,6
String 2 = 13,45,63,29,10,8
String 3 = 11,62,5,20,13,2
Then you should get this:
String combined = 1,2,3,4,5,6,13,45,63,29,10,8,11,62,5,20,13,2 //add in the missing "," when you concatenate strings
Next you need to split the string into an array of all values.
Use code somewhat like this: (written off the top of my head so may be off.)
String[] values = combined.split(",");
Now you should have something like this:
Values = `"1", "2", "3", ... etc`
The last step is to loop through the entire array and modulo for whatever column you need:
//Remember that java numbers arrays starting with 0.
//The key here is that all remainder 0 items fall into the first column. All remainder 1 items fall into the second column. And so on.
for(int i = 0; i < values.length(); i++)
{
//Column1 - Column6 -> array lists of size values.length/number of columns
//In this case they need to be size values.length/6
if(i % 6 == 0)
column1.add(values[i]);
else if(i % 6 == 1)
column2.add(values[i]);
else if(i % 6 == 2)
column3.add(values[i]);
else if(i % 6 == 3)
column4.add(values[i]);
else if(i % 6 == 4)
column5.add(values[i]);
else if(i % 6 == 5)
column6.add(values[i]);
}
~~~~~~~~~~~~~~~~
Edit:
You added code to your question. Above I was saving them into memory. You just loop through and print them out. In your while loop, split each line separately into an array and then either hardcode the column number or modulo the length of the array as the index.

public class ParseCSVs {
public static void main(String[] args) {
try {
// csv file containing data
String strFile = "./input//SIMNumbers.csv";
String line = "";
System.out.println("Enter line number to configure");
Scanner sc = new Scanner(System.in);
int lineNumber = sc.nextInt();
BufferedReader br = new BufferedReader(new FileReader(strFile));
if ((line = br.readLine()) != null) {
String cvsSplitBy = ",";
String blankCell = null;
// use comma as separator
String[] cols = line.split(cvsSplitBy);
for (int i = 0; i < cols.length; i++)
System.out.println("Coulmns = " + cols[i]);
// System.exit(0);
} else
System.out.println("No data found in csv");
} catch (IOException e) {
e.printStackTrace();
}
}