Java实现Excel工作表与图表转图片的实用方案

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.xls</artifactId>
        <version>16.7.3</version>
    </dependency>
</dependencies>

import com.spire.xls.*;

public class ExcelToImage {
    public static void main(String[] args) {
        // 创建工作簿实例并加载 Excel 文件
        Workbook workbook = new Workbook();
        workbook.loadFromFile("sample.xlsx");

        // 获取第一个工作表
        Worksheet sheet = workbook.getWorksheets().get(0);

        // 将工作表保存为图片
        sheet.saveToImage("output/SheetToImage.png");
        
        workbook.dispose();
    }
}

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

public class SpecificCellsToImage {
    public static void main(String[] args) throws Exception {
        Workbook workbook = new Workbook();
        workbook.loadFromFile("sample.xlsx");

        Worksheet sheet = workbook.getWorksheets().get(0);

        // 将第1行第1列到第7行第4列的区域转换为图片
        BufferedImage image = sheet.toImage(1, 1, 7, 4);
        ImageIO.write(image, "PNG", new File("output/range.png"));
        
        workbook.dispose();
    }
}

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

public class ChartToImage {
    public static void main(String[] args) throws Exception {
        Workbook workbook = new Workbook();
        workbook.loadFromFile("Charts.xlsx");

        Worksheet sheet = workbook.getWorksheets().get(0);

        // 保存第一个图表为图片
        BufferedImage image = workbook.saveChartAsImage(sheet, 0);
        ImageIO.write(image, "PNG", new File("output/chart.png"));
        
        workbook.dispose();
    }
}

BufferedImage[] images = workbook.saveChartAsImage(sheet);
for (int i = 0; i < images.length; i++) {
    ImageIO.write(images[i], "PNG", new File("output/chart-" + i + ".png"));
}

ChartSheet chartSheet = workbook.getChartsheets().get(0);
BufferedImage image = workbook.saveChartAsImage(chartSheet);
ImageIO.write(image, "PNG", new File("output/chartSheet.png"));

Workbook workbook = new Workbook();
workbook.loadFromFile("sample.xlsx");

// 设置水平和垂直分辨率为 300 DPI
workbook.getConverterSetting().setXDpi(300);
workbook.getConverterSetting().setYDpi(300);

Worksheet sheet = workbook.getWorksheets().get(0);
sheet.saveToImage("output/highres.png");