Programmer-yyds commented on issue #879:
URL: https://github.com/apache/poi/issues/879#issuecomment-3190828729
How do I delete temporary files if I use SXSSFWorkbook? SXSSFWorkbook has no
getPackage () method.
```
public class ExcelImageWriter {
static {
// 启用临时文件模式，降低内存占用
ZipPackage.setUseTempFilePackageParts(true);
System.setProperty("java.io.tmpdir",
"/Users/shanjiacong/Desktop/temp");
}
private final SXSSFWorkbook workbook;
private final SXSSFSheet sheet;
private final SXSSFDrawing drawing;
private final AtomicInteger rowIndex = new AtomicInteger(0);
private final String outputPath;
public ExcelImageWriter(String outputPath) {
this.workbook = new SXSSFWorkbook(100);
this.sheet = workbook.createSheet("Images");
this.drawing = sheet.createDrawingPatriarch();
this.outputPath = outputPath;
}
public static void main(String[] args) throws Exception {
ExcelImageWriter writer = new
ExcelImageWriter("/Users/shanjiacong/Desktop/temp/output.xlsx");
byte[] bytes =
readImageBytes("/Users/shanjiacong/Downloads/wps-excel-embed-image-main/test02.jpg");
for (int i = 0; i < 5; i++) {
writer.addImage(bytes);
}
writer.save();
writer.close();
System.out.println("writeCompleted！");
}
private static byte[] readImageBytes(String path) {
try (InputStream is = new FileInputStream(path)) {
return IOUtils.toByteArray(is);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private static int detectPictureType(byte[] bytes) {
try {
String mimeType = URLConnection.guessContentTypeFromStream(new
ByteArrayInputStream(bytes));
if ("image/png".equals(mimeType)) {
return Workbook.PICTURE_TYPE_PNG;
} else if ("image/jpeg".equals(mimeType)) {
return Workbook.PICTURE_TYPE_JPEG;
} else {
throw new IllegalArgumentException("Unsupported image type:
" + mimeType);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public void addImage(byte[] image) {
int rowNum = rowIndex.getAndIncrement();
Row row = sheet.createRow(rowNum);
row.setHeightInPoints(60);
int pictureIndex = workbook.addPicture(image,
detectPictureType(image));
// 列1行(rowNum) 到 列2行(rowNum+1)
XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, 0,
rowNum, 1, rowNum + 1);
anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE);
drawing.createPicture(anchor, pictureIndex);
}
public void save() {
try (FileOutputStream fos = new FileOutputStream(outputPath)) {
workbook.write(fos);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public void close() {
try {
workbook.close();
workbook.dispose(); // 删除临时文件
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
```
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