https://github.com/ashfaqbs/springboot_storing_data_in_excel

This is a springboot file to demonstrate using of excel/csv file , here we are taking list of objects and passing it to a service which has a method when called it will store the data in excel file
https://github.com/ashfaqbs/springboot_storing_data_in_excel

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This is a springboot file to demonstrate using of excel/csv file , here we are taking list of objects and passing it to a service which has a method when called it will store the data in excel file

• Host: GitHub
• URL: https://github.com/ashfaqbs/springboot_storing_data_in_excel
• Owner: Ashfaqbs
• Created: 2023-01-07T17:45:16.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2023-08-21T01:51:01.000Z (over 1 year ago)
• Last Synced: 2023-11-22T12:36:42.387Z (12 months ago)
• Language: Java
• Size: 38.1 KB
• Stars: 3
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Springboot_Storing_Data_In_Excel

## This is a springboot file to demonstrate  using of excel/csv file , here we are taking list of objects and passing it to a service which has a method when called it will store the data in excel file.

dependency  used in pom.xml

                 

			org.apache.poi

			 poi-ooxml

			5.1.0

		 

### service class

          package com.demo.excelConfig;

        import java.io.FileOutputStream;

         import java.io.IOException;

          import java.util.List;

             import org.apache.poi.ss.usermodel.Cell;

           import org.apache.poi.ss.usermodel.Row;

            import org.apache.poi.xssf.usermodel.XSSFSheet;

               import org.apache.poi.xssf.usermodel.XSSFWorkbook;

            import org.apache.poi.ss.usermodel.Sheet;

         import com.demo.model.Car;

           import jakarta.servlet.ServletOutputStream;

            import jakarta.servlet.http.HttpServletResponse;

           public class CarsExcelExporter {

	

	

	//method to take list of car data and write in excel and store it in target folder

	 public void writeDataToExcel(List cars) throws IOException {

		 //creating the excelworkbook

	      XSSFWorkbook workbook = new XSSFWorkbook();

	     //creating the sheet in that workbook

	      Sheet sheet = workbook.createSheet("Sheet1");

	      

	  //    creating the coulmns by targeting the 0th row

	      Row headerRow = sheet.createRow(0);

	      headerRow.createCell(0).setCellValue("ID");//providing the 0th , 1st and 2nd cell of the 0th row column names

	      headerRow.createCell(1).setCellValue("Name");

	      headerRow.createCell(2).setCellValue("Price");

	      

	    //  since we have data , we will create a loop and add data and increment the row , and so we will start the row from 1st as for 0th have given the column             name

	      int rowNum = 1;

	      for (Car car : cars) {

	         Row row = sheet.createRow(rowNum++);

	         row.createCell(0).setCellValue(car.getcId());

	         row.createCell(1).setCellValue(car.getcName());

	         row.createCell(2).setCellValue(car.getCost());

	      }

	      FileOutputStream outputStream = new FileOutputStream("target/car_data.xlsx");

	      workbook.write(outputStream);

	      outputStream.close();

	   }

            }

### Will download the excel when we call the respective  REST api

           package com.demo.excelConfig;

            import java.util.List;

            import org.apache.poi.ss.usermodel.Row;

       import org.apache.poi.ss.usermodel.Sheet;

         import org.apache.poi.xssf.usermodel.XSSFWorkbook;

         import com.demo.model.Car;

            public class ExcelExportService {

	

	

	 //exporting excel service

	  public XSSFWorkbook generateExcelFile(List cars) {

	        XSSFWorkbook workbook = new XSSFWorkbook();

	      Sheet sheet = workbook.createSheet("Sheet1");

	      Row headerRow = sheet.createRow(0);

	      headerRow.createCell(0).setCellValue("ID");

	      headerRow.createCell(1).setCellValue("Name");

	      headerRow.createCell(2).setCellValue("Price");

	      int rowNum = 1;

	      for (Car car : cars) {

	         Row row = sheet.createRow(rowNum++);

	         row.createCell(0).setCellValue(car.getcId());

	         row.createCell(1).setCellValue(car.getcName());

	         row.createCell(2).setCellValue(car.getCost());

	      }

  

	      return workbook;

	    }

 

	

        }

### demonstratration

### downloading excel

	       @GetMapping("/download")

	       public ResponseEntity downloadExcelFile() throws IOException {

		ExcelExportService excelExportService = new ExcelExportService();

		List cars = carService.getCars();

		// retrieve data from database or some other source

		org.apache.poi.xssf.usermodel.XSSFWorkbook workbook = excelExportService.generateExcelFile(cars);

		HttpHeaders headers = new HttpHeaders();

		headers.setContentDispositionFormData("attachment", "data.xlsx");

		headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

		ByteArrayOutputStream baos = new ByteArrayOutputStream();

		workbook.write(baos);

		byte[] bytes = baos.toByteArray();

		return new ResponseEntity<>(bytes, headers, HttpStatus.OK);

           	}