Java Examples - Write Data into Excel Sheet


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Problem Description

How to write data into excel sheet using Java.

Solution

Following is the program to write data into excel sheet using Java.

import java.io.File;
import java.io.FileOutputStream;

import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class WriteDataToExcel {
   public static void main(String[] args) throws Exception {

      //Create blank workbook
      XSSFWorkbook workbook = new XSSFWorkbook();
      
      //Create a blank sheet
      XSSFSheet spreadsheet = workbook.createSheet( " Employee Info ");

      //Create row object
      XSSFRow row;

      //This data needs to be written (Object[])
      Map < String, Object[] > empinfo = new TreeMap < String, Object[] >();
      empinfo.put( "1", new Object[] {
         "EMP ID", "EMP NAME", "DESIGNATION" });
      
      empinfo.put( "2", new Object[] {
         "tp01", "Gopal", "Technical Manager" });
      
      empinfo.put( "3", new Object[] {
         "tp02", "Manisha", "Proof Reader" });
      
      empinfo.put( "4", new Object[] {
         "tp03", "Masthan", "Technical Writer" });
      
      empinfo.put( "5", new Object[] {
         "tp04", "Satish", "Technical Writer" });
      
      empinfo.put( "6", new Object[] {
         "tp05", "Krishna", "Technical Writer" });

      //Iterate over data and write to sheet
      Set < String > keyid = empinfo.keySet();
      int rowid = 0;
      
      for (String key : keyid) {
         row = spreadsheet.createRow(rowid++);
         Object [] objectArr = empinfo.get(key);
         int cellid = 0;
         
         for (Object obj : objectArr){
            Cell cell = row.createCell(cellid++);
            cell.setCellValue((String)obj);
         }
      }
      //Write the workbook in file system
      FileOutputStream out = new FileOutputStream(
         new File("C:/poiexcel/Writesheet.xlsx"));
      
      workbook.write(out);
      out.close();
      System.out.println("Writesheet.xlsx written successfully");
   }
}

Result

Write into Excel
java_apache_poi_excel

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