From b0bc2d669975bae11086f1b9ea7ad8f1c392a6ec Mon Sep 17 00:00:00 2001 From: horaoen Date: Thu, 2 Jan 2025 10:01:37 +0800 Subject: [PATCH] add post: export-excel-with-image --- content/posts/export-excel-with-image.md | 154 +++++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 content/posts/export-excel-with-image.md diff --git a/content/posts/export-excel-with-image.md b/content/posts/export-excel-with-image.md new file mode 100644 index 0000000..677ae0b --- /dev/null +++ b/content/posts/export-excel-with-image.md @@ -0,0 +1,154 @@ ++++ +title = "excel导出插入图片" +date = "2025-01-02" ++++ + +## dependency +```xml + + com.alibaba + easyexcel + 3.2.1 + +``` +## imp +```java +public class CustomImageModifyHandler implements CellWriteHandler { + private final List repeats = new ArrayList<>(); + + private void insertImage(Sheet sheet, Cell cell, byte[] pictureData, int i) { + int picWidth = Units.pixelToEMU(60); + int index = sheet.getWorkbook().addPicture(pictureData, HSSFWorkbook.PICTURE_TYPE_PNG); + Drawing drawing = sheet.getDrawingPatriarch(); + if (drawing == null) { + drawing = sheet.createDrawingPatriarch(); + } + CreationHelper helper = sheet.getWorkbook().getCreationHelper(); + ClientAnchor anchor = helper.createClientAnchor(); + // 设置图片坐标 + anchor.setDx1(picWidth * i); + anchor.setDx2(picWidth + picWidth * i); + anchor.setDy1(0); + anchor.setDy2(0); + //设置图片位置 + anchor.setCol1(cell.getColumnIndex()); + anchor.setCol2(cell.getColumnIndex()); + anchor.setRow1(cell.getRowIndex()); + anchor.setRow2(cell.getRowIndex() + 1); + // 设置图片可以随着单元格移动 + anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE); + drawing.createPicture(anchor, index); + } + + @Override + public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, WriteCellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) { + // 在 数据转换成功后 不是头就把类型设置成空 + if (isHead) { + return; + } + //将要插入图片的单元格的type设置为空,下面再填充图片 + if (cellData.getData() != null || cellData.getData() instanceof ArrayList) { + cellData.setType(CellDataTypeEnum.EMPTY); + } + } + + @Override + @SuppressWarnings("rawtypes") + public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) { + // 在 单元格写入完毕后 ，自己填充图片 + if (isHead || CollectionUtils.isEmpty(cellDataList)) { + return; + } + boolean listFlag = false; + ArrayList data = null; + Sheet sheet = cell.getSheet(); + // 此处为ListUrlConverterUtil的返回值 + if (cellDataList.get(0).getData() instanceof ArrayList) { + data = (ArrayList) cellDataList.get(0).getData(); + if (data.isEmpty()) { + return; + } + if (data.get(0) instanceof CellData) { + CellData cellData = (CellData) data.get(0); + if (cellData instanceof WriteCellData) { + listFlag = true; + } else { + return; + } + } + } + if (!listFlag && cellDataList.get(0).getData() == null) { + return; + } + String key = cell.getRowIndex() + "_" + cell.getColumnIndex(); + if (repeats.contains(key)) { + return; + } + repeats.add(key); + // 默认要导出的图片大小为60*60px,60px的行高大约是900,60px列宽大概是248*8 + sheet.getRow(cell.getRowIndex()).setHeight((short) 900); + if (listFlag && 240 * 8 * data.size() < 3000) { + sheet.setColumnWidth(cell.getColumnIndex(), 3000); + } else { + sheet.setColumnWidth(cell.getColumnIndex(), listFlag ? 240 * 8 * data.size() : 240 * 8); + } + if (listFlag) { + for (int i = 0; i < data.size(); i++) { + WriteCellData cellData = (WriteCellData) data.get(i); + if (cellData.getData() == null) { + continue; + } + this.insertImage(sheet, cell, (byte[]) cellData.getData(), i); + } + } else { + // cellDataList 是list的原因是 填充的情况下 可能会多个写到一个单元格 但是如果普通写入 一定只有一个 + this.insertImage(sheet, cell, (byte[]) cellDataList.get(0).getData(), 0); + } + } +} +``` + +```java +public class ListUrlImageConverter implements Converter> { + public static int urlConnectTimeout = 1000; + public static int urlReadTimeout = 5000; + + @Override + public Class supportJavaTypeKey() { + return List.class; + } + + @Override + @SuppressWarnings({"rawtypes", "unchecked"}) + public WriteCellData convertToExcelData(List value, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception { + List data = new ArrayList<>(); + for (URL url : value) { + InputStream inputStream = null; + try { + URLConnection urlConnection = url.openConnection(); + urlConnection.setConnectTimeout(urlConnectTimeout); + urlConnection.setReadTimeout(urlReadTimeout); + inputStream = urlConnection.getInputStream(); + byte[] bytes = IoUtils.toByteArray(inputStream); + WriteCellData cellData = new WriteCellData(bytes); + cellData.setData(bytes); + data.add(cellData); + } finally { + if (inputStream != null) { + inputStream.close(); + } + } + } + WriteCellData cellData = new WriteCellData(); + cellData.setData(data); + cellData.setType(CellDataTypeEnum.EMPTY); + return cellData; + } +} +``` +## usage +```java +@ExcelProperty(value = "相关附件", converter = ListUrlImageConverter.class) +@ColumnWidth(value = 40) +prijvate List imgUrls; +``` \ No newline at end of file