I'm using JExcel API to open and edit an existing .xls file.
First problem was that I can't directly edit the opened xls file. I need to make a copy of that first. (Question1: It is possible to edit the opened workbook or not?)
My solution to that based on some internet information was:
Workbook workbook=Workbook.getWorkbook(inputfile);
...
WritableWorkbook wb=Workbook.createWorkbook(inputfile, workbook);
wb.write();
wb.close();
//Edit cells in wb
This works but the updated version of the xls has the wrong formatting.
So, Question 2: Is there any way to keep the format when I copy workbooks?
Well, I solved it by using Apache API.
Even though it is not as well documented as JExcel it seems to do its job better.
Related
I have a simple java program that creates .xls file (open office excel file), and I want to save it as pdf. I saw some answers here but none of them worked for me. Is there a simple and free way to do so?
The file contains only 1 page of .xls
Thanks
Not sure, please provide more details , share code so that the answer can be more precise, but for code perspective it can be achieved via Apache POI.something like below ....
//Instantiate a new workbook with excel file path
Workbook workbook = new Workbook("F:\\FileTemp\\Book1.xls");
//Save the document in Pdf format
workbook.save("F:\\FileTemp\\MyPdfFile.pdf", FileFormatType.PDF);
I have published a library that saves files, and handles everything with one line of code only, you can find it here along with its documentation
Github repository
and the answer to your question is so easy
String path = FileSaver
.get()
.save(fileXls,"file.pdf");
I need to write one java program which monitors a folder containing excel sheets (.xls format) . Once a new excel sheet is added I have to update the database in db2 and move the excel sheet to other place.
Please suggest
It sounds like you need to get notified if files appear in a directory. Java 7 has good support for this, see this article about the Watch Service API. The db2 part, well it isn't clear what you mean by "update", but likely you want to parse the content of the xls file and make some database updates. Apache POI is a good starting place for reading the content of the file into a Java process.
I wrote a Java method that uses POI HSSF API to convert an Excel file to my data structure.
The code worked just fine for a while. But now there are suddenly problems. I suspect it might be because recently we installed Office 2007 on all the client computers, previously we had Office 2003.
The problem I ran into is: Inside the XLS file I have a column of cells that is filled with serial-numbers by the user. When the Java application gets the cell, it has a cell type STRING. And when I ask for the string value of the cell I get an empty string.
The file is originally created by the application, then the users fill it with data and load it back into the aplication. So I don't think the file format is wrong, since it's created by the same version of the API.
What could be the problem?
EDIT:
Clarification: We upgraded Office installation to 2007, but the application still uses HSSF and XLS format. Only the users open and edit the files with Office 2007. Is that a problem?
Have you checked if Excel automatically switched the cell type to NUMERIC when the user entered the value?
Excel has this annoying feature to "intelligently guess" what kind of value the user enters which then often causes a problem in POI.
HSSF is the POI Project's pure Java implementation of the Excel '97(-2007) file format. XSSF is the POI Project's pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.
read furthur
http://poi.apache.org/spreadsheet/index.html
I have this Java program that uses apache poi to load data from an excel file.
Problem I'm facing is I can't seem to load data from the excel file that is constantly updating. I only get the initial data when I run my java program.
You have to reread the data from the excel file. POI makes a copy into java objects when it reads it, so any further changes won't get reflected in your Java code without rereading the file.
If you mean that you do reread the file but don't see the updates, then it could be that someone is making changes in excel but not saving them, so POI can't see them yet.
This Answer is referred from Fetch Data From Excel have a look at this answer for more details. Maybe this question is a duplicate of the above link or vice versa.
The problem is because the excel data is not saved. I was also dealing with the same problem and got up with a different solution which worked for me. I just created a macro in excel to save the excel workbook whenever it's cell values got changed. Now I got the excel file with up-to-date saved data which can be read through java code and can be used for other purposes.
Related to this question, how to save many different csv files into one excel workbook with one sheet per csv ? I would like to know how to do this programmatically in Java.
You'll need some form of library for accessing Excel from Java. A Google search turned this one up:
http://j-integra.intrinsyc.com/support/com/doc/excel_example.html
An alternative is to use the XML Excel format that came into being with Office 2003. You'll end up with a XML file, but you can open it in Excel and see the different sheets.
http://www.javaworld.com/javaworld/jw-07-2004/jw-0712-officeml.html
If you want open source, the POI library can be used to generated Excel files.
A nice CSV parser is Open CSV
That should set the stage for what you are trying to do (basically use the CSV parser to get data, then write the data to an XLS file.
Take a look at the Aspose products, I've used them before when working with Excel and they saved me a huge amount of headache and time. Excel has several quirks that can make importing and exporting spreadsheets painful.
Aspose.Cells