使用java代码将excel文件输入流转换成png文件输入流
时间: 2023-08-06 10:07:54 浏览: 50
要将Excel文件输入流转换为PNG文件输入流,需要进行以下步骤:
1. 使用Apache POI库读取Excel文件输入流,将其转换为Workbook对象。
2. 使用Apache Batik库将Workbook对象转换为SVG字符串。
3. 使用Apache Batik库将SVG字符串转换为PNG文件输出流。
以下是Java代码示例,可以实现将Excel文件输入流转换为PNG文件输入流:
```java
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.svggen.SVGGeneratorContext;
import org.apache.batik.svggen.SVGGraphics2D;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class ExcelToPNGConverter {
public static InputStream convert(InputStream excelStream) throws Exception {
// Read the Excel file input stream
Workbook workbook = WorkbookFactory.create(excelStream);
// Create a new SVG document
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
Document document = SVGDOMImplementation.getDOMImplementation().createDocument(svgNS, "svg", null);
Element svgRoot = document.getDocumentElement();
// Generate SVG from the Excel file
SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(document);
SVGGraphics2D graphics = new SVGGraphics2D(ctx, false);
graphics.setSVGCanvasSize(workbook.getSpreadsheetVersion().getLastRowIndex(), workbook.getSpreadsheetVersion().getLastColumnIndex());
workbook.getSheetAt(0).draw(graphics);
graphics.getRoot(svgRoot);
// Convert SVG to PNG
ByteArrayOutputStream pngStream = new ByteArrayOutputStream();
org.apache.batik.transcoder.Transcoder transcoder = new org.apache.batik.transcoder.image.PNGTranscoder();
org.apache.batik.transcoder.TranscoderInput transcoderInput = new org.apache.batik.transcoder.TranscoderInput(document);
org.apache.batik.transcoder.TranscoderOutput transcoderOutput = new org.apache.batik.transcoder.TranscoderOutput(pngStream);
transcoder.transcode(transcoderInput, transcoderOutput);
return new ByteArrayInputStream(pngStream.toByteArray());
}
}
```
使用方式:
```java
InputStream excelStream = new FileInputStream("input.xlsx");
InputStream pngStream = ExcelToPNGConverter.convert(excelStream);
```
注意:需要添加以下依赖库:
- Apache POI
- Apache Batik
- XML Graphics Commons