java excel转图片
时间: 2023-08-04 16:12:15 浏览: 105
excel转图片
在 Java 中将 Excel 转换为图片可以使用 Apache POI 和 Apache Batik 库。
以下是一个简单的示例代码:
```java
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.ImageTranscoder;
import org.apache.commons.io.IOUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.AreaReference;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.w3c.dom.svg.SVGDocument;
public class ExcelToImageConverter {
public static void main(String[] args) throws Exception {
// 读取 Excel 文件
Workbook workbook = new XSSFWorkbook("path/to/excel.xlsx");
// 或者使用 HSSFWorkbook,如果你的 Excel 文件是 .xls 格式的
// Workbook workbook = new HSSFWorkbook("path/to/excel.xls");
// 获取第一个 Sheet 的区域
AreaReference areaReference = new AreaReference(
"A1:Z1000",
workbook.getSpreadsheetVersion()
);
// 获取第一个 Sheet 的 SVG 图像
String svg = getSvgFromExcel(workbook, areaReference);
// 将 SVG 转换为 BufferedImage
BufferedImage image = svgToImage(svg, 1024, 768);
// 保存图片到文件
saveImage(image, "path/to/image.png");
}
/**
* 从 Excel 文件中获取指定区域的 SVG 图像
*/
private static String getSvgFromExcel(Workbook workbook, AreaReference areaReference) throws IOException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
workbook.write(outputStream);
byte[] bytes = outputStream.toByteArray();
CellReference topLeft = areaReference.getFirstCell();
CellReference bottomRight = areaReference.getLastCell();
String sheetName = workbook.getSheetName(0);
// 构建 SVG 文件的内容
StringBuilder sb = new StringBuilder();
sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n");
sb.append("<svg width=\"100%\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n");
sb.append(String.format("<g transform=\"translate(%d,%d)\">\n", -topLeft.getCol(), -topLeft.getRow()));
sb.append(String.format("<foreignObject width=\"%d\" height=\"%d\">\n", bottomRight.getCol() - topLeft.getCol() + 1, bottomRight.getRow() - topLeft.getRow() + 1));
sb.append(String.format("<body xmlns=\"http://www.w3.org/1999/xhtml\">\n"));
sb.append(String.format("<table xmlns=\"http://www.w3.org/1999/xhtml\" border=\"1\">\n"));
// 读取 Excel 中的单元格,并将其转换为 HTML 表格
for (int row = topLeft.getRow(); row <= bottomRight.getRow(); row++) {
sb.append("<tr>");
for (int col = topLeft.getCol(); col <= bottomRight.getCol(); col++) {
sb.append(String.format("<td>%s</td>", workbook.getSheet(sheetName).getRow(row).getCell(col)));
}
sb.append("</tr>\n");
}
sb.append("</table>\n");
sb.append("</body>\n");
sb.append("</foreignObject>\n");
sb.append("</g>\n");
sb.append("</svg>");
return sb.toString();
}
/**
* 将 SVG 图像转换为 BufferedImage
*/
private static BufferedImage svgToImage(String svg, int width, int height) throws TranscoderException, IOException {
TranscoderInput input = new TranscoderInput(IOUtils.toInputStream(svg));
BufferedImageTranscoder transcoder = new BufferedImageTranscoder();
transcoder.addTranscodingHint(ImageTranscoder.KEY_WIDTH, (float) width);
transcoder.addTranscodingHint(ImageTranscoder.KEY_HEIGHT, (float) height);
transcoder.transcode(input, null);
return transcoder.getImage();
}
/**
* 保存 BufferedImage 到文件
*/
private static void saveImage(BufferedImage image, String filePath) throws IOException {
FileOutputStream outputStream = new FileOutputStream(filePath);
javax.imageio.ImageIO.write(image, "png", outputStream);
outputStream.close();
}
/**
* 用于将 SVG 图像转换为 BufferedImage 的类
*/
private static class BufferedImageTranscoder extends ImageTranscoder {
private BufferedImage image;
public BufferedImage getImage() {
return image;
}
@Override
public BufferedImage createImage(int width, int height) {
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
return bi;
}
@Override
public void writeImage(BufferedImage image, TranscoderOutput output) throws TranscoderException {
this.image = image;
}
}
}
```
该代码将 Excel 文件中的第一个 Sheet 转换为 SVG 图像,然后将其转换为 BufferedImage,并将其保存为 PNG 图像。你可以自由地修改此代码以满足你的需求。
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