Update or edit existing Excel files in Java using Apache POI

Requirement -Programatically update an Excel spreadsheet in Java.

Solutions – Here an example of Apache POI to update a XLS workbook. Apache POI is a very good API , that can be handy in manipulating Excel documents.This tutorial focuses on XLS documents (Office 97 – 2003).

The existing excel file like below –

Below is code to update the excel file

import java.io.*;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.ss.usermodel.*;
import java.util.Iterator;
public class updateExcels {  

        public static void main(String[] args) throws Exception{
                
                FileInputStream fsIP= new FileInputStream(new File("C:\\TechartifactExcel.xls")); //Read the spreadsheet that needs to be updated
                 
                HSSFWorkbook wb = new HSSFWorkbook(fsIP); //Access the workbook
                 
                HSSFSheet worksheet = wb.getSheetAt(0); //Access the worksheet, so that we can update / modify it.
                 
                Cell cell = null; // declare a Cell object
               
                cell = worksheet.getRow(2).getCell(2);   // Access the second cell in second row to update the value
                 
                cell.setCellValue("OverRide Last Name");  // Get current cell value value and overwrite the value
                 
                fsIP.close(); //Close the InputStream
                
                FileOutputStream output_file =new FileOutputStream(new File("C:\\TechartifactExcel.xls"));  //Open FileOutputStream to write updates
                 
                wb.write(output_file); //write changes
                 
                output_file.close();  //close the stream    
        }
}

after updating excel file would look like below –

happy coding with Vinay in techartifact ….