如何将图像放在excel java的单元格中？

Question

I have tried to put an image into an Excel cell with java but without much success this is the code I was working but the only thing I've done is put the image on excel sheet but not in a cell specified

XSSFWorkbook wb = new XSSFWorkbook();
Sheet sheet = wb.createSheet("My Sample Excel");
//FileInputStream obtains input bytes from the image file
InputStream inputStream = new FileInputStream("C:/images/logo.png");
//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();
anchor.setCol1(1);
anchor.setRow1(2);
//Creates a picture
Picture pict = drawing.createPicture(anchor, pictureIdx);
//Reset the image to the original size
pict.resize();
//Write the Excel file
FileOutputStream fileOut = null;
fileOut = new FileOutputStream("C:/data/myFile.xlsx");
wb.write(fileOut);
fileOut.close();

Answer 1

What you are doing already is positioning the image with the anchor to upper left cell B3 ( anchor.setCol1(1);anchor.setRow1(2); ). Then you already resize the image to it's native size.

If the image shall fit into the cell B3 then you must create an anchor with upper left cell and bottom right cell. And you must not resize the image to it's native size.

Example:

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) {
  }
 }
}

If you remove the comment signs form the program rows

...
   //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);
...

you can resize the cell B3 and so the image resizes.

Answer 2

    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<Employee> 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", "ravi@example.com",
                dateOfBirth.getTime(), 1200000.0));

        dateOfBirth.set(1965, 10, 15);
        employees.add(new Employee("Gayathri Sirimanna", "fer@example.com",
                dateOfBirth.getTime(), 1500000.0));

        dateOfBirth.set(1987, 4, 18);
        employees.add(new Employee("Bivon Jethmain", "bivon@example.com",
                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();
    }
}