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1.Introduction

In this tutorial, we will demonstrate the use of the Apache POI and JExcel APIs for working with Excel spreadsheets.

Both libraries can be used to dynamically read, write and modify the content of an Excel spreadsheet and provide an effective way of integrating Microsoft Excel into a Java Application.

2. Maven Dependencies

To begin, we will need to add the following dependencies to our pom.xml file:

The latest versions of poi-ooxml and jxls-jexcel can be downloaded from Maven Central.

3. Apache POI

The Apache POI library supports both .xls and .xlsx files and is a more complex library than other Java libraries for working with Excel files.

It provides the Workbook interface for modeling an Excel file, and the Sheet, Row, and Cell interfaces that model the elements of an Excel file, as well as implementations of each interface for both file formats.

When working with the newer .xlsx file format, you would use the XSSFWorkbook, XSSFSheet, XSSFRow, and XSSFCell classes.

To work with the older .xls format, use the HSSFWorkbook, HSSFSheet, HSSFRow, and HSSFCell classes.

3.1. Reading from Excel

Let's create a method that opens a .xlsx file, then reads content from the first sheet of the file.

The method for reading cell content varies depending on the type of the data in the cell. The type of the cell content can be determined using the getCellTypeEnum() method of the Cell interface.

First, let's open the file from a given location:

Next, let's retrieve the first sheet of the file and iterate through each row:

Apache POI has different methods for reading each type of data. Let's expand on the content of each switch case above.

When the cell type enum value is STRING, the content will be read using the getRichStringCellValue() method of Cell interface:

Cells having the NUMERIC content type can contain either a date or a number and are read in the following manner:

For BOOLEAN values, we have the getBooleanCellValue() method:

And when the cell type is FORMULA, we can use the getCellFormula() method:

3.2. Writing to Excel

Apache POI uses the same interfaces presented in the previous section for writing to an Excel file and has better support for styling than JExcel.

Let's create a method that writes a list of persons to a sheet titled 'Persons'. First, we will create and style a header row that contains 'Name' and 'Age' cells:

Next, let's write the content of the table with a different style:

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Finally, let's write the content to a ‘temp.xlsx' file in the current directory and close the workbook:

Let's test the above methods in a JUnit test that writes content to the temp.xlsx file then reads the same file to verify it contains the text we have written:

4. JExcel

The JExcel library is a lightweight library having the advantage that it's easier to use than Apache POI, but with the disadvantage that it only provides support for processing Excel files in the .xls (1997-2003) format.

At the moment, .xlsx files are not supported.

4.1. Reading from Excel

In order to work with Excel files, this library provides a series of classes that represent the different parts of an excel file. The Workbook class represents the entire collection of sheets. The Sheet class represents a single sheet, and the Cell class represents a single cell of a spreadsheet.

Let's write a method that creates a workbook from a specified Excel file, gets the first sheet of the file, then traverses its content and adds each row in a HashMap:

4.2. Writing to Excel

For writing to an Excel file, the JExcel library offers classes similar to the ones used above, that model a spreadsheet file: WritableWorkbook, WritableSheet, and WritableCell.

The WritableCell class has subclasses corresponding to the different types of content that can be written: Label, DateTime, Number, Boolean, Blank, and Formula.

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This library also provides support for basic formattings, such as controlling font, color and cell width.

Let's write a method that creates a workbook called ‘temp.xls' in the current directory, then writes the same content we wrote in the Apache POI section.

First, let's create the workbook:

Next, let's create the first sheet and write the header of the excel file, containing 'Name' and 'Age' cells:

With a new style, let's write the content of the table we've created:

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It's very important to remember to write to the file and close it at the end so it can be used by other processes, using the write() and close() methods of Workbook class:

5.Conclusion

This tutorial has illustrated how to use the Apache POI API and JExcel API to read and write an Excel file from a Java program.

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The complete source code for this article can be found in the GitHub project.

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