Opening Existing Excel sheet in Java using Apache POI

Last Updated : 25 Apr, 2022

Apache POI is a powerful API by which one can read, write and modify any Microsoft document like powerpoint, world, or excel.
Apache POI have different classes and method to work upon different MS Office Document.

POIFS –
It’s Stand for “Poor Obfuscation Implementation File System”. This component is the basic factor of all other POI elements. It is used to read different files explicitly.
HSSF
It’s Stand for “Horrible Spreadsheet Format”. It is used to read and write xls format of MS-Excel files.
XSSF
It’s Stand for “XML Spreadsheet Format”. It is used for xlsx file format of MS-Excel.
HPSF
It’s Stand for “Horrible Property Set Format”. It is used to extract property sets of the MS-Office files.
HWPF
It’s Stand for “Horrible Word Processor Format”. It is used to read and write doc extension files of MS-Word.
XWPF
It’s Stand for “XML Word Processor Format”. It is used to read and write docx extension files of MS-Word.
HSLF
It’s Stand for “Horrible Slide Layout Format”. It is used for read, create, and edit PowerPoint presentations.
HDGF
It’s Stand for “Horrible Diagram Format”. It contains classes and methods for MS-Visio binary files.
HPBF
It’s Stand for “Horrible PuBlisher Format”. It is used to read and write MS-Publisher files.

Steps to Open Existing Excel Sheet in Java, in eclipse

Create a JAVA Maven project
Add dependency in pom.xml file

XML

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
  
<dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi</artifactId> 
      <version>3.12</version> 
    </dependency> 
    <dependency> 
      <groupId>org.apache.poi</groupId> 
      <artifactId>poi-ooxml</artifactId> 
      <version>3.12</version> 
    </dependency> 

Create a class in javaResource folder

Java

import java.io.File; 
import java.io.FileInputStream; 
  
import org.apache.poi.xssf.usermodel.XSSFWorkbook; 
  
public class GFG { 
    public static void main(String args[]) throws Exception 
    { 
  
        // Create a file object 
        // for the path of existing Excel file 
        // Give the path of the file as parameter 
        // from where file is to be read 
        File file = new File("Geeks.xlsx"); 
  
        // Create a FileInputStream object 
        // for getting the information of the file 
        FileInputStream fip = new FileInputStream(file); 
  
        // Getting the workbook instance for XLSX file 
        XSSFWorkbook workbook = new XSSFWorkbook(fip); 
  
        // Ensure if file exist or not 
        if (file.isFile() && file.exists()) { 
            System.out.println("Geeks.xlsx open"); 
        } 
        else { 
            System.out.println("Geeks.xlsx either not exist"
                               + " or can't open"); 
        } 
    } 
} 