java excel转图片

要将 Excel 中的表格转换为图片，可以使用 Apache POI 和 Java 的图形库。以下是一个示例代码：

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class ExcelToImage {
    public static void main(String[] args) {
        try {
            // 读取 Excel 文件
            Workbook workbook = WorkbookFactory.create(new File("input.xls"));
            HSSFSheet sheet = (HSSFSheet) workbook.getSheetAt(0);

            // 计算表格的宽度和高度
            int width = 0;
            int height = 0;
            for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
                HSSFRow row = sheet.getRow(i);
                if (row != null) {
                    int rowWidth = 0;
                    int rowHeight = 0;
                    for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                        HSSFCell cell = row.getCell(j);
                        if (cell != null) {
                            HSSFRichTextString richTextString = cell.getRichStringCellValue();
                            if (richTextString != null && richTextString.length() > 0) {
                                Font font = cell.getCellStyle().getFont(workbook);
                                int cellWidth = getCellWidth(cell, font);
                                rowWidth += cellWidth;
                                rowHeight = rowHeight > cell.getRowHeight() ? rowHeight : cell.getRowHeight();
                            }
                        }
                    }
                    width = width > rowWidth ? width : rowWidth;
                    height += rowHeight;
                }
            }

            // 创建 BufferedImage 对象并绘制表格
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2d = image.createGraphics();
            g2d.setColor(Color.WHITE);
            g2d.fillRect(0, 0, width, height);
            int y = 0;
            for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
                HSSFRow row = sheet.getRow(i);
                if (row != null) {
                    int x = 0;
                    int rowHeight = 0;
                    for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                        HSSFCell cell = row.getCell(j);
                        if (cell != null) {
                            HSSFRichTextString richTextString = cell.getRichStringCellValue();
                            if (richTextString != null && richTextString.length() > 0) {
                                Font font = cell.getCellStyle().getFont(workbook);
                                int cellWidth = getCellWidth(cell, font);
                                int cellHeight = cell.getRowHeight();
                                rowHeight = rowHeight > cellHeight ? rowHeight : cellHeight;
                                drawCell(g2d, richTextString.toString(), font, x, y, cellWidth, cellHeight);
                                x += cellWidth;
                            }
                        }
                    }
                    y += rowHeight;
                }
            }

            // 保存为图片
            ImageIO.write(image, "png", new File("output.png"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 绘制单元格
    private static void drawCell(Graphics2D g2d, String text, Font font, int x, int y, int width, int height) {
        g2d.setFont(font);
        g2d.setPaint(Color.BLACK);
        g2d.drawString(text, x, y + height - 5);
        g2d.setPaint(Color.GRAY);
        g2d.drawRect(x, y, width, height);
    }

    // 获取单元格宽度
    private static int getCellWidth(HSSFCell cell, Font font) {
        int defaultWidth = 64;
        int defaultHeight = 20;
        int charWidth = font.getSize() * 7 / 10;
        int cellWidth = cell.getStringCellValue().getBytes().length * charWidth;
        int width = cellWidth > defaultWidth ? cellWidth : defaultWidth;
        return width;
    }
}

此代码将表格转换为 BufferedImage 对象，并绘制在其中。然后将 BufferedImage 对象保存为 PNG 图片。您可以根据需要修改此代码以适应您的情况。