Apache POI is a set of Java APIs that can transfer data to and from Excel and other Microsoft Office file formats. It can be used for extracting text, loading tabular data and generate a document index.
The users who need to export data from Java applications usually have to deal with plain text, CSV or XML files. In order to use these files in other applications, the users need to use additional conversion tools or format the data manually.
A developer can use the components from this package in order to improve the user experience by exporting tabular data to Excel documents. Additional components for Word, Access and other programs are also included.
The APIs are able to convert the data to a format that complies with the Office OpenXML standard which allows you to generate XLSX, DOCX or PPTX files. These formats are supported by the latest versions of Microsoft Office and by other applications such as OpenOffice or LibreOffice.
Addtional Java libraries are available if you need to work with other Office files such as the Outlook messages or the Visio documents. However, each component is developed separately which means that the performance is different.
Some of the libraries support AES or RC4 encryption which allows the applications to read data from password protected files. Unfortunately, the support is not available for all file types.
If you need to create Java apps that can load data from Excel documents or PowerPoint presentations, Apache POI is good tool.
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Apache POI Activation Code
The new version of Core Project does not support the older styles that are used in the components. However, many components need to support the styles and therefore the developers are forced to bundle older styles.
In this article, I will look at the files and methods that are used in the latest version of the Apach POI project.
Everything starts with the class called XWPFDocument. This is the base class for all documents. The project has a set of interfaces for the OfficeOpenXML formats but these interfaces are not maintained anymore. Every component has its own class that supports the same formats.
All these documents have a XWPFWord Processing object which is responsible for the conversion of the text. This is done by using the WordprocessingMLPackage and the property settings in the document.
In order to create documents you need to use the methods from the package. There are several classes that are used as types for the conversion.
The conversion classes are ExtractedText, Tika, RTF and TextConverter. The first two classes perform the conversion. The conversion classes are used for common classes, text fragments or the data conversion. The exception is the Tika class which is able to identify the data in the Office format. In order to format the data properly, you need to use one of the document writer classes.
The text has to be transformed from the Unicode to a single codepage or an array of codepages. For internationalized projects the XWPFProperty supports the ICU Converter which is able to detect the target codepage.
The converter classes that are used in the text classification are UnicodeToCharArrayConverter, UnicodeToStringConverter, CharToCodepageConverter and UnicodeToCodepageConverter. However, the text transformation is done in the ExtractedText class.
Microsoft Office OpenXML is a standard that defines the document formats. Each Office application can be used to read the data from the document. However, the documents are not directly readable. The data has to be converted in order to be used by the application.
The conversion classes are:
WordprocessingMLPackageConverter: The main converter class in the project. It is used in all components except for the Tika component. This class supports all the formats defined by the OfficeOpenXML standard.
HWPFDocumentConverter: Used for the Excel formats
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Apache POI is the Java standard for reading, writing, and manipulating Office Open XML files.
Apache POI is a sub-project of Apache Commons. As such, it will be a dependency for the Maven project Apache Commons.
The Apache POI Project page describes the project.
The Apache POI FAQ describes the features of POI.
Contributions to Apache POI are, by their nature, generally very incremental, and they tend to focus on new features or improvements to existing features.Q:
Errors with using CGI::Simple::Operations::Integer
When I try to use the CGI::Simple::Operations::Integer library for my CGI script, it errors out with:
use CGI::Simple::Operations qw(integer);
You have requested Perl with Unicode Collate semantics, but the script was built without this Perl feature.
But Perl from my terminal does have Unicode Collate, so why would it give this error?
The value of $^U can be used to check if the perl was compiled with the option to enable Unicode Collate.
@a = (1,2,3);
$^U = 1;
print “Convert ‘n’ to’s’:”, integer($a).” -> “.integer($a);
print “Convert ‘n’ to ‘l’:”, integer($a).” -> “.integer($a);
Result on my machine:
@a = (1,2,3);
$^U = 1;
Convert ‘n’ to’s’: 2 -> 3
Convert ‘n’ to ‘l’: 3 -> 2
The error message is printed because you are using an obsolete feature that has been removed from CPAN and is no longer supported in perl 5.10. But these features are still supported in perl 5.8.
Use of “to be” in a sentence
According to Cambridge Dictionary ‘to be’ is an adjective for describing states of existence.
Could we use it as a verb in this sentence:
I’m writing this message to be delivered to you in three days.
I think it
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Apache POI is a Java library for performing various kinds of I/O operations on Microsoft Office documents. It is not just a file format converter, but also can export Excel, Word and PowerPoint files.
Apache POI can be used by Java applications to create, edit and convert multiple kinds of documents. It can handle the native Office file formats, which means that the developers can modify their applications to work with other document formats easily.
The library is able to convert Microsoft Office documents to plain text, CSV, HTML or XML. Its components include word processing, spreadsheet and presentation software. They can read and write files in the older formats (for example, the MS Excel 5.0 and MS Word 6.0 formats), but also the newer formats (for example, Excel 2007).
Apache POI can read and create files in the following formats:
Adobe Acrobat PDF documents
Microsoft Excel 97 to 2007 and 2010, 2006 and 2003 with newer cells and formulas:
* The Microsoft Excel 2007 SDK requires a server license
* The MS Office.NET Framework 3.0 SDK
** Works only if the Microsoft Office.NET Framework 3.0 SDK is also installed
MS Access Database formats:
* Access 2000
* Access 2003 (ODBC)
* Access 2007 (ODBC)
* Microsoft Access 2007 (*.accdb)
* Microsoft Access 2007 (Jet) (*.mdb)
* Microsoft Access 2010 (*.accdb; *.mdb)
* Microsoft Access 2010 with Jet ODBC driver
* Microsoft Access 2010 with OLEDB driver
* MS Office Open XML (OOXML) documents (*.docx, *.dotx, *.xlsx, *.pptx)
If you want to install the library you can download the.tar.gz archive from the project website.
The installation instructions are available on the website. The libraries are also included in many of the JDKs, IDEs and other development environments.
The Apache POI contains the following components:
OS: Windows 7/8/10
Processor: 2.4 GHz Intel Core 2 Duo / AMD Athlon II X4 630 / Phenom II X4 965
Memory: 1 GB RAM
Graphics: nVidia GeForce GTS 450 / AMD Radeon HD 7870 or better
DirectX: Version 9.0c
Network: Broadband internet connection
Sound Card: Windows 7/8/10 Audio Card