Question

我想问一下是否有任何方法可以使用Apache Excel POI将图像设置为工作表背景？我只能找到如何设置单元格的背景色。我希望您使用 Excel->页面布局->背景获得相同的功能。

谢谢。

Answer 1

答案取决于Excel文件的类型。

对于Office Open XML格式*.xlsx，它很简单：

import java.io.FileOutputStream;
import java.io.FileInputStream;

import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.*;

import org.apache.poi.util.IOUtils;

public class CreateExcelXSSFSheetBackgroundPicture {

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

  try (XSSFWorkbook workbook = new XSSFWorkbook(); 
       FileOutputStream out = new FileOutputStream("CreateExcelXSSFSheetBackgroundPicture.xlsx")) {

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

   //add picture data to this workbook.
   FileInputStream is = new FileInputStream("dummy.png");
   byte[] bytes = IOUtils.toByteArray(is);
   int pictureIdx = workbook.addPicture(bytes, Workbook.PICTURE_TYPE_PNG);
   is.close();

   //add relation from sheet to the picture data
   String rID = sheet.addRelation(null, XSSFRelation.IMAGES, workbook.getAllPictures().get(pictureIdx))
                      .getRelationship().getId();
   //set background picture to sheet
   sheet.getCTWorksheet().addNewPicture().setId(rID);

   workbook.write(out);

  }

 }
}

对于二进制BIFF格式*.xls，它与Using java.awt.image.BufferedImage for creating BIFF8 BITMAP record takes much time - Is there any better approach?一样复杂。

Answer 2

如果你使用 poi 5. maven repo 应该。它仅适用于 xlsx。

<poi.version>5.0.0</poi.version>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>${poi.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-full</artifactId>
            <version>${poi.version}</version>
        </dependency>

spring boot 和使用 lombok

    public void addWatermark() throws IOException {
        val workbook = WorkbookFactory.create(this.inputStream);
        XSSFWorkbook wb =(XSSFWorkbook) workbook;
        // get an image input stream from classpath
        ClassPathResource classPathResource = new ClassPathResource("bub.png");
        InputStream inputStream = classPathResource.getInputStream();
        int pictureIdx = workbook.addPicture(IOUtils.toByteArray(inputStream), Workbook.PICTURE_TYPE_PNG);
        inputStream.close();
        for (int i = 0; i < wb.getNumberOfSheets(); i++) {
            XSSFSheet sheet = wb.getSheetAt(i);
            String rID = sheet.addRelation(null, XSSFRelation.IMAGES,wb
                    .getAllPictures().get(pictureIdx)).getRelationship().getId();
            sheet.getCTWorksheet().addNewPicture().setId(rID);
        }
    }

设置Excel工作表背景图片

2 个答案: