I want to write data fetched from a database table every time to new text files with different names.
I use Calendar.getInstance().getTime() to make the filename unique and create the corresponding new txt file in the required directory:
String path = "/home/username/Documents/Netbeans Projects/cashbackEngine/Reports";
Date currentTime = Calendar.getInstance().getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmm");
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
String dateString = simpleDateFormat.format(currentTime);
String reportFileName2 = "ICC_Cashback_Report_SS_$1$.txt".replace("$1$", sdf.format(currentTime));
String reportFilePath2 = path + "/" + reportFileName2;
File file = new File(reportFilePath2);
writer = new FileWriter(file, true);
Then I iterate over the dataset and write the data to the file by using writer.write();
Is there any other simple way to do this... or any inbuilt string builder method in Java to automatically generates the new file names with constant prefix and unique suffix numbers.
I don't want to use a timestamp to distinguish it from others
and every time new data will get added to the newly generated text file whenever the Java code is executed...
You could use a simple counter as a file prefix. You'd have to persist the current state of the counter between different runs of the program, though, e.g. also in the database. Here's a question dealing with the same issue and answers containing your current approach and others.
Related
I know I'm probably doing something wrong, but I am trying to format a Date that is currently stored inside of a string but it won't let me parse it to a String because it doesn't recognize it as a Date (because it's in a String variable) and won't let me format it because it cannot format it in its current state. For reference, I am making a time clock application.
I apologize if I'm doing something stupid but I am fairly new to this and have never used SimpleDateFormat before. I put some snippets of code below:
ArrayList<String> punchHistoryTimes = new ArrayList<String>();
SimpleDateFormat sdf =new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
public void updatePunchHistory(Sheet sheet){
for(int rowNum:rowNumbers){
punchHistoryTimes.add(sheet.getRow(rowNum).getCell(1).getStringCellValue());
punchHistory.add(new JLabel(sheet.getRow(rowNum).getCell(0).getRichStringCellValue().getString()+ " " + sheet.getRow(rowNum).getCell(1).getRichStringCellValue().getString()+ " " + sheet.getRow(rowNum).getCell(2).getRichStringCellValue().getString()));
}
}
//other code is above this but not relevant to the issue
currentEmployee.setEndTime(sdf.format(currentDate));
if(punchHistory.get(punchHistory.size()-1).getText().contains("Clocked In")){
calcTimeWorked(punchHistory.get(punchHistoryTimes.size()-1).getText(),currentEmployee.getEndTime());
}else{
//This line below is where the error is happening
//value of currentEmployee.getStartTime() at error: 1654653731536
//value of currentEmployee.getEndTime() at error: 07-06-2022 21:02:12
//Both currentEmployee.getStartTime() and currentEmployee.getEndTime() are stored as Strings
calcTimeWorked(currentEmployee.getStartTime(),currentEmployee.getEndTime());
}
currentEmployee.setHoursWorked(differenceInTime);
I tried using the debugger and it shows the error is that it cannot parse 1654653731536. I understand the issue but cannot get a solution. I believe the issue is because when it stores the value in the excel file it is storing the date as a string but then when it pulls the date back out of the excel later (the application would have been closed between these events) it views it as a string and does not recognize that there is a Date inside of the String. Is there any way to cast the String 1654653731536 to a Date?
I have to validate and read .txt files from a date wise folder. Need suggestions on best possible ways to achieve this
I will have a property file which will have following information
value active channel
5092 Y 11
5092 Y 12
5092 Y 13
5093 N 10
5093 N 11
from this property file first i need get active value(i.e. 5092) and their channel information i.e 11,12,13
based on the above information need to iterate files from a date wise folder.
Input(folder)
10JUN2017
HW_5092_ABC_11.txt
HW_5092_ABC_12.txt
HW_5092_ABC_13.txt
11JUN2017
HW_5092_ABC_11.txt
HW_5092_ABC_12.txt
Based on the property file information (i.e. 5092 is active file and it has channel 11,12,13) look for the current date folder i.e. 11JUN2017 then look for files of 5092. If 11JUN2017 has files related to 5092 (i.e. all 3 files 11,12 and 13) then need to read files from 11JUN2017 folder and process the files. Else need to go back to previous date then look for the files.
In the above example, 11JUN2017 does not have all the files so, i need to go back to previous date i.e. 10JUN2017 and look for the files if found then process it. If 10JUN2017 also does not have all files then go back to previous date (max no of days to traverse back is 43 days).
Update
There is some change in my requirement. There will not be date wise folder instead file name itself contains date in YYYYMMdd format and all files will be in single folder, for example, filename will be like as follows BIG_ABCHINE_MATERIAL_2092_11_20170614-150136-243.txt.
So below is what I am trying
public void fileLoadingProcess() {
//Reading text file which contains all the information
in = new BufferedReader(new FileReader("C:\\OrgDetails.txt"));
in.readLine();
String str;
while ((str = in.readLine()) != null) {
values = str.split("\t");
//Adding config property values to Map
if (values[5].equalsIgnoreCase("Y")) {
System.out.println("Active sales org " + values[0]);
if (distChannelMap.containsKey(values[0])) {
list = distChannelMap.get(values[0]);
list.add(Integer.parseInt(values[6]));
} else {
list = new ArrayList<Integer>();
list.add(Integer.parseInt(values[6]));
distChannelMap.put(values[0], list);
}
} else {
System.out.println("Inactive Sales org " + values[0]);
}
}
Set set = distChannelMap.entrySet();
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
Map.Entry mentry = (Map.Entry) iterator.next();
System.out.println("Key --> " + mentry.getKey() + " Value(s) -->" + mentry.getValue());
//Calling this method to check file needs to be processed based on active and inactive states
isFileNeedsToBeProcessed(mentry.getKey().toString(), (ArrayList<Integer>) mentry.getValue());
}
//Check whether this file is exists or not
//
}
public void isFileNeedsToBeProcessed(String salesOrg, ArrayList<Integer> distChannel) {
System.out.println("Previous Day " + new TxtToXMLCommon().previousDate(1));
//String previousDate = new TxtToXMLCommon().getCurrentDate();
for (int i = 0; i < distChannel.size(); i++) {
int x =1;
previousDate = new TxtToXMLCommon().previousDate(x);
System.out.println("Distribution channel " + distChannel.get(i));
File folder = new File(Constants.INPUT_FOLDER);
File[] files = folder.listFiles();
if (files.length == 0) {
_logger.info("***No files present to process***");
return;
} else {
for (int k = 0; k < files.length; k++) {
if (files[k].getName().contains("MATERIAL")) {
if (salesOrg.equalsIgnoreCase(files[k].getName().substring(21, 25))
&& (distChannel.get(i) == Integer.parseInt(files[k].getName().substring(26, 28)))&&
previousDate.equalsIgnoreCase(files[k].getName().substring(29, 37))) {
System.out.println("File present to process " + files[k].getName());
break;
// if () {
// //processingFilesMap.put("MATERIAL", files[k].getName());
// System.out.println("File present to process " + files[k].getName());
// }else{
//
// }
}else{
//previousDate = new TxtToXMLCommon().previousDate(x+1);
}
//previousDate = new TxtToXMLCommon().previousDate(2);
}//end of if(MATERIAL)
}// end of files length
}
}
}
But I am little bit stuck here while finding for the file in a folder(single source folder). Say, as you see, I have put the property file information in the distChannelMap and then for each value I am iterating source folder and trying to find the file which contains org value values[0] and key values[6] which I have stored in arraylist. because for one value 5092 there are 3 channel.
Now if I do not find file matching org value (5092), channel (11) and date (20170615), I need to iterate the folder again with date-1 means value 5092, channel 11 and date 20170614 like this till 43 days. once i found the file I am thinking to put it into map so that I have all files which are ready to process. But I am little bit stuck in going to previous date when i do not the file for particular channel. once this channel is find, I need to do the same process for other channels like 12 and 13 for the org 5092.
I think it’s simplest to take one channel at a time.
Construct the file name from active value and channel number, for example
String.format("HW_%d_ABC_%d.txt", activeValue, channel)
Use LocalDate for the folder names.
DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("ddMMMuuuu", Locale.ENGLISH);
LocalDate date = LocalDate.now(ZoneId.systemDefault());
String folderName = date.format(dateFormatter).toUpperCase(Locale.ROOT);
Think twice about the time zone to use. ZoneId.systemDefault() will give you the JVM’s current setting, it may not be what you need. I am typing this on June 10th and understand that in your time zone it’s already June 11th. Would be a pity to miss today’s files because of incorrect time zone.
In a loop, look for the file in the folder. If found, exit the loop. If not found, do
date = date.minusDays(1);
folderName = date.format(dateFormatter).toUpperCase(Locale.ROOT);
This will give you the folder name of the previous day’s folder. Then look there.
This will work across the beginning of the month and the beginning of the year. For the limit of looking 43 days back, either use a counter or set
LocalDate limit = date.minusDays(43);
and then give up when date.isBefore(limit).
Edit If you want to start from the folders and files, look into Files.newDirectoryStream(Path, String). You may use it first to find the folders of this month and the previous two months (that should cover 43 days and more), maybe filter and sort them. Next for each folder you can use the same method to determine which files are present. You will have a challenge keeping track of which files are present in more than one folder and which one is the newest, it can be solved. I am not immediately convinced about the advantage of this approach, but I trust you to make a good decision for yourself.
I'm doing an integration testing with DBUnit (2.49) + Hibernate (4.1.3) following this tutorial.
Production database : Oracle 10
Test database : Hsqldb 2.3.3
Context
My data contains the current format of date : yyyy/MM/dd. However,according to DBUnit faq, DBUnit only supports this format yyyy-mm-dd hh:mm:ss.fffffffff, so I had to create a new format for TimeStamp.
How I tried to fix it
I created a CustomTimeStampDataType based on this tutorial. I changed this part:
String formats[] = {"yyyy-MM-dd HH:mm", "yyyy-MM-dd HH:mm a", "yyyy-MM-dd HH:mm:ss.fffffffff"};
into this one:
String formats[] = {"yyyy/MM/dd"};
I created a CustomeDataTypeFactory following the same tutorial. I only make it extend Oracle10DataTypeFactory rather than DefaultDatatTypeFactory.
In HibernateDBUnitTestCase, I override setDatabaseConfig() with the following:
#Override
protected void setUpDatabaseConfig(DatabaseConfig config){
config.setProperty(DatabaseConfig.PROPERTY_DATATYPE_FACTORY, new CustomDataTypeFactory());
}
But I got new errors
I ran a unit test and got this error.
org.dbunit.dataset.datatype.TypeCastException: Unable to typecast value <1997/02/14> of type <java.lang.String> to TIMESTAMP
at org.dbunit.dataset.datatype.TimestampDataType.typeCast(TimestampDataType.java:120)
at org.dbunit.dataset.datatype.TimestampDataType.setSqlValue(TimestampDataType.java:176)
at org.dbunit.database.statement.SimplePreparedStatement.addValue(SimplePreparedStatement.java:73)
at org.dbunit.operation.RefreshOperation$RowOperation.execute(RefreshOperation.java:189)
at org.dbunit.operation.RefreshOperation.execute(RefreshOperation.java:113)
at org.dbunit.AbstractDatabaseTester.executeOperation(AbstractDatabaseTester.java:190)
at org.dbunit.AbstractDatabaseTester.onSetup(AbstractDatabaseTester.java:103)
at org.dbunit.DatabaseTestCase.setUp(DatabaseTestCase.java:156)
at test.HibernateDbUnitTestCase.setUp(HibernateDbUnitTestCase.java:85)
at test.PlayerTest.setUp(PlayerTest.java:117)
Caused by: java.lang.IllegalArgumentException: Timestamp format must be yyyy-mm-dd hh:mm:ss[.fffffffff]
at java.sql.Timestamp.valueOf(Unknown Source)
at org.dbunit.dataset.datatype.TimestampDataType.typeCast(TimestampDataType.java:116)
... 20 more
That was weird, it seemed like my CustomTimeStamp was not called, so I changed the date in the dataset using the default format : 1997-02-14 00:00:00.0, and ran the unit test again. Then I got:
org.dbunit.dataset.datatype.TypeCastException: Unable to typecast value <1997-02-14 00:00:00.0> of type <java.lang.String> to TIMESTAMP
at test.CustomTimestampDataType.typeCast(CustomTimestampDataType.java:69)
at test.CustomTimestampDataType.setSqlValue(CustomTimestampDataType.java:84)
at org.dbunit.database.statement.SimplePreparedStatement.addValue(SimplePreparedStatement.java:73)
at org.dbunit.operation.RefreshOperation$RowOperation.execute(RefreshOperation.java:189)
at org.dbunit.operation.RefreshOperation.execute(RefreshOperation.java:113)
at org.dbunit.AbstractDatabaseTester.executeOperation(AbstractDatabaseTester.java:190)
at org.dbunit.AbstractDatabaseTester.onSetup(AbstractDatabaseTester.java:103)
at org.dbunit.DatabaseTestCase.setUp(DatabaseTestCase.java:156)
at test.HibernateDbUnitTestCase.setUp(HibernateDbUnitTestCase.java:85)
at test.PlayerTest.setUp(PlayerTest.java:117)
That means CustomTimeStamp was actually called. Seems like, the problem stemed from DatabaseTestCase.setUp which somehow called the wrong TimeStampDataType.
How could I fix this issue?
My first option was to replace every yyyy/MM/dd into yyyy-mm-dd in the dataset using regular expressions. This worked fine, until I had to test a method that selected a date based on a request (so the format is yyyy-mm-dd) and compared it to the current date. ( so the format is yyyy / mm / dd). Hsqldb can't compare two dates with different format.
My second option was to decompile dbunit.jar, rewrite TimeStampDataType based on the tutorial. I'm unfamiliar with bytecode writing so before entering uncharted waters, I wanted to know if you had another solution.
Thank you in advance
Fixed it!
So I ended up using my second option.
This is the detailed path for those who need it.
Download dbUnit.2.2.source.jar
Unzip the jar
Go to Eclipse, File > New > Java Project
Uncheck "Use default location"
In Location : specify the path to the new folder created from the jar
Click on Finish
Modify the TimestampDataType.java (if needed)
Instead of ts = java.sql.Timestamp.valueOf(stringValue); use the code below
String formats[] =
{"dd/MM/yyyy HH:mm:ss.SS"}; //and more depending on your need
Timestamp ts = null;
for (int i = 0; i < formats.length; i++)
{
SimpleDateFormat sdf = new SimpleDateFormat(formats[i]);
try {
java.util.Date date = sdf.parse(stringValue);
ts = new Timestamp(date.getTime());
return ts;
}
catch( ParseException e) {
}
Modify the DateDataType.java (if needed)
Instead of return java.sql.Date.valueOf(stringValue); , use the code below
String formats[] =
{"dd/MM/yyyy"}; //and more depending on your need
for (int i = 0; i < formats.length; i++)
{
SimpleDateFormat sdf = new SimpleDateFormat(formats[i]);
try {
java.util.Date date = sdf.parse(stringValue);
java.sql.Date datesql = new java.sql.Date(date.getTime());
return datesql;
}
catch( ParseException e) {
}
}
Right-click on your project, then Export
Select JAR file, then Next
Fill the export destination then Finish.
You just have to add this new jar to the library to make it work.
I'm writing a code where there is this properties file that needs to update every day based on date.
Basically there is an Excel sheet that has to be used as a source document for my Web App. But everyday there is a new file that gets generated, And the file name would be workbooktoday'sDate, like for example if the date is 06/09/2016, the file name would be workbook20160609, right now I'm making this in a class file, and I want to move everything to a properties file, currently my code is as below(In a Java class).
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date();
private String todayDate = dateFormat.format(date);
String replaceHyph = todayDate.replace("-", "");
String x = "workbook";
String y = ".xls";
private String excelPath = x + replaceHyph + y;
and in my next program I use the below statement.
conn = DriverManager.getConnection(
"jdbc:odbc:Driver={Microsoft Excel Driver (*.xls)};DBQ=" + excelPath + "; READONLY=FALSE;");
And this would set the source filename to workbookToday'sDate, how can I get the same in properties file?
How can I achieve the same in my Properties file?
I thought of declaring only half part say like jdbc:odbc:Driver={Microsoft Excel Driver (*.xls)};DBQ=" and concatenating as I did above and at the end again concatenating "; READONLY=FALSE;");. Is this a good approach, or is there a better one?
I am designing a staff data manager which will allow the users to add, edit and view the staff details.
In the code I have a JFormattedTextField defined as follows.
SimpleDateFormat dateDOB = new SimpleDateFormat("dd/MM/yyyy");
JFormattedTextField DOBBX = new JFormattedTextField(dateDOB);
When I want to edit the staff data, I load the date to the JFormattedTextField as follows:
DOBBX.setText(""+retrievedStaff.getDOB());
After editing if I save the data, the value for DOB is null and I get a java.lang.NullPointerException. This only happens if I leave the value for DOB unedited. If I make changes to DOB or enter it again then DOB value is correctly saved.
Also if I add a new staff and then try to edit the staff data without closing the program, the date is properly saved to the binary file with no nullpointer error.
How do I fix this?
(I have no idea how to provide an MCVE for this as my code is quite long and consists of many classes)
Before saving the date to binary file I use the following method to convert it to a string:
public String getDOB() {
SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy");
try{
String textDate = df.format((DOB));
return textDate;
}catch(Exception e){e.printStackTrace();}
return null;
}
In the StackTrace it is mentioned that the error is produced by this part of the code:
String textDate = df.format((DOB));
I solved this problem. So as I told in the question that the date is properly saved to binary file if I click or change the DOB textbox. So I set the cursor to DOB textfield when the user clicks edit button using requestFocus().