Java: Convert Excel to Image

When you work with Excel worksheets on a daily basis, you sometimes need to convert them to images for storage or preventing data from being changed when shared with others. This article will show you how to convert a whole Excel worksheet or a specific cell range to an image using Spire.XLS for Java.

• Convert a Whole Excel Worksheet to Image
• Convert a Specific Cell Range to Image

Install Spire.XLS for Java

First of all, you're required to add the Spire.Xls.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.xls</artifactId>
        <version>4.12.2</version>
    </dependency>
</dependencies>

Convert a Whole Excel Worksheet to Image

The following steps will demonstrate how to convert a whole Excel worksheet to an image.

• Create a Workbook instance.
• Load a sample Excel document using Workbook.loadFromFile() method.
• Get a specific worksheet of the document using Workbook.getWorksheets().get() method.
• Convert the worksheet to an image using Worksheet.saveToImage() method.

import com.spire.xls.*;

public class ExcelToImage {
    public static void main(String[] args){

        //Create a workbook instance
        Workbook workbook = new Workbook();
        //Load a sample Excel document
        workbook.loadFromFile("C:\\Users\\Test1\\Desktop\\sample.xlsx");

        //Get the first worksheet
        Worksheet sheet = workbook.getWorksheets().get(0);

        //Save the sheet to an image
        sheet.saveToImage("output/SheetToImage.png");
    }
}

Convert a Specific Cell Range to Image

Spire.XLS for Java supports converting a specific cell range to an image by using the Worksheet.toImage (int firstRow,int firstColumn,int lastRow,int lastColumn) method. Detailed steps are listed below.

• Create a Workbook instance.
• Load a sample Excel document using Workbook.loadFromFile() method.
• Get a specific worksheet of the document using Workbook.getWorksheets().get() method.
• Create a BufferedImage instance.
• Convert a specific cell range to the ButteredImage object using Worksheet.toImage () method.
• Save the BufferedImage object to a .png image.

import com.spire.xls.Workbook;
import com.spire.xls.Worksheet;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;

public class SpecificCellsToImage {
    public static void main(String[] args) throws IOException {

        //Create a workbook instance
        Workbook workbook = new Workbook();
        //Load a sample Excel document
        workbook.loadFromFile("C:\\Users\\Test1\\Desktop\\sample.xlsx");

        //Get the first worksheet
        Worksheet sheet = workbook.getWorksheets().get(0);

        //Convert a specific cell range to the BufferedImage object  
        BufferedImage bufferedImage = sheet.toImage(1, 1, 7, 4);
        //Save as a .png image
ImageIO.write(bufferedImage,"PNG",new File("output/specificCellsToImage.png"));
    }
}

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.