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Solución:
Lo que ya está haciendo es posicionar la imagen con el ancla en la celda superior izquierda B3 (anchor.setCol1(1);anchor.setRow1(2);). Entonces ya cambia el tamaño de la imagen a su tamaño nativo.
Si la imagen encaja en la celda B3 entonces debes crear un ancla con la celda superior izquierda y celda inferior derecha. Y no debe cambiar el tamaño de la imagen a su tamaño nativo.
Ejemplo:
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.util.IOUtils;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
class ImageTest
public static void main(String[] args)
try
Workbook wb = new XSSFWorkbook();
Sheet sheet = wb.createSheet("My Sample Excel");
//FileInputStream obtains input bytes from the image file
InputStream inputStream = new FileInputStream("/home/axel/Bilder/Wasserlilien.jpg");
//Get the contents of an InputStream as a byte[].
byte[] bytes = IOUtils.toByteArray(inputStream);
//Adds a picture to the workbook
int pictureIdx = wb.addPicture(bytes, Workbook.PICTURE_TYPE_PNG);
//close the input stream
inputStream.close();
//Returns an object that handles instantiating concrete classes
CreationHelper helper = wb.getCreationHelper();
//Creates the top-level drawing patriarch.
Drawing drawing = sheet.createDrawingPatriarch();
//Create an anchor that is attached to the worksheet
ClientAnchor anchor = helper.createClientAnchor();
//create an anchor with upper left cell _and_ bottom right cell
anchor.setCol1(1); //Column B
anchor.setRow1(2); //Row 3
anchor.setCol2(2); //Column C
anchor.setRow2(3); //Row 4
//Creates a picture
Picture pict = drawing.createPicture(anchor, pictureIdx);
//Reset the image to the original size
//pict.resize(); //don't do that. Let the anchor resize the image!
//Create the Cell B3
Cell cell = sheet.createRow(2).createCell(1);
//set width to n character widths = count characters * 256
//int widthUnits = 20*256;
//sheet.setColumnWidth(1, widthUnits);
//set height to n points in twips = n * 20
//short heightUnits = 60*20;
//cell.getRow().setHeight(heightUnits);
//Write the Excel file
FileOutputStream fileOut = null;
fileOut = new FileOutputStream("myFile.xlsx");
wb.write(fileOut);
fileOut.close();
catch (IOException ioex)
Si elimina los signos de comentario de las filas del programa
...
//set width to n character widths = count characters * 256
int widthUnits = 20*256;
sheet.setColumnWidth(1, widthUnits);
//set height to n points in twips = n * 20
short heightUnits = 60*20;
cell.getRow().setHeight(heightUnits);
...
puedes cambiar el tamaño de la celda B3 y así la imagen cambia de tamaño.
package com.excel;
import java.io.FileInputStream;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFPicture;
public class ExcelWriter
private static String[] columns = "Name", "Email", "Date Of Birth", "Salary", "Photo";
private static List employees = new ArrayList<>();
// Initializing employees data to insert into the excel file
static
Calendar dateOfBirth = Calendar.getInstance();
dateOfBirth.set(1992, 7, 21);
employees.add(new Employee("Ravinath Fernandoh", "[email protected]",
dateOfBirth.getTime(), 1200000.0));
dateOfBirth.set(1965, 10, 15);
employees.add(new Employee("Gayathri Sirimanna", "[email protected]",
dateOfBirth.getTime(), 1500000.0));
dateOfBirth.set(1987, 4, 18);
employees.add(new Employee("Bivon Jethmain", "[email protected]",
dateOfBirth.getTime(), 1800000.0));
public static void main(String[] args) throws IOException, InvalidFormatException
// Create a Workbook
Workbook workbook = new XSSFWorkbook(); // new HSSFWorkbook() for generating `.xls` file
/* CreationHelper helps us create instances of various things like DataFormat,
Hyperlink, RichTextString etc, in a format (HSSF, XSSF) independent way */
CreationHelper createHelper = workbook.getCreationHelper();
// Create a Sheet
Sheet sheet = workbook.createSheet("Employee");
// Create a Font for styling header cells
Font headerFont = workbook.createFont();
headerFont.setBold(true);
headerFont.setFontHeightInPoints((short) 14);
headerFont.setColor(IndexedColors.RED.getIndex());
// Create a CellStyle with the font
CellStyle headerCellStyle = workbook.createCellStyle();
headerCellStyle.setFont(headerFont);
// Create a Row
Row headerRow = sheet.createRow(0);
// Create cells
for (int i = 0; i < columns.length; i++)
Cell cell = headerRow.createCell(i);
cell.setCellValue(columns[i]);
cell.setCellStyle(headerCellStyle);
// Create Cell Style for formatting Date
CellStyle dateCellStyle = workbook.createCellStyle();
dateCellStyle.setDataFormat(createHelper.createDataFormat().getFormat("dd-MM-yyyy"));
// Create Other rows and cells with employees data
int rowNum = 1;
for (Employee employee : employees)
Row row = sheet.createRow(rowNum++);
row.setHeight((short) 1000);
row.createCell(0).setCellValue(employee.getName());
row.createCell(1).setCellValue(employee.getEmail());
Cell dateOfBirthCell = row.createCell(2);
dateOfBirthCell.setCellValue(employee.getDateOfBirth());
dateOfBirthCell.setCellStyle(dateCellStyle);
row.createCell(3).setCellValue(employee.getSalary());
//============= Inserting image - START
/* Read input PNG / JPG Image into FileInputStream Object*/
InputStream my_banner_image = new FileInputStream("D:\PB_PROJECT\NFC School Card\NFCREST\web\photo_student\4566.png");
/* Convert picture to be added into a byte array */
byte[] bytes = IOUtils.toByteArray(my_banner_image);
/* Add Picture to Workbook, Specify picture type as PNG and Get an Index */
int my_picture_id = workbook.addPicture(bytes, Workbook.PICTURE_TYPE_PNG);
/* Close the InputStream. We are ready to attach the image to workbook now */
my_banner_image.close();
/* Create the drawing container */
XSSFDrawing drawing = (XSSFDrawing) sheet.createDrawingPatriarch();
/* Create an anchor point */
//============= Inserting image - END
//========adding image START
XSSFClientAnchor my_anchor = new XSSFClientAnchor();
/* Define top left corner, and we can resize picture suitable from there */
my_anchor.setCol1(5); //Column B
my_anchor.setRow1(rowNum-1); //Row 3
my_anchor.setCol2(6); //Column C
my_anchor.setRow2(rowNum); //Row 4
/* Invoke createPicture and pass the anchor point and ID */
XSSFPicture my_picture = drawing.createPicture(my_anchor, my_picture_id);
//========adding image END
// Resize all columns to fit the content size
for (int i = 0; i < columns.length; i++)
sheet.autoSizeColumn(i);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("poi-generated-file.xlsx");
workbook.write(fileOut);
fileOut.close();
// Closing the workbook
workbook.close();
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