生成工作表的缩略图
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从工作表生成缩略图可能很有用。缩略图是一个小图像，可以粘贴到 Word 文档或 PowerPoint 演示文稿中，以预览工作表上的内容。它可以添加到带有下载原始文档链接的网页中，并具有许多其他用途。
Aspose.Cells for Java 允许您将工作表输出到图像文件，因此制作缩略图很容易。
下面的示例代码逐步向您展示了如何操作。
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| // For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java | |
| // The path to the documents directory. | |
| String dataDir = Utils.getSharedDataDir(GenerateThumbnailofWorksheet.class) + "TechnicalArticles/"; | |
| // Instantiate and open an Excel file | |
| Workbook book = new Workbook(dataDir + "book1.xlsx"); | |
| // Define ImageOrPrintOptions | |
| ImageOrPrintOptions imgOptions = new ImageOrPrintOptions(); | |
| // Set the vertical and horizontal resolution | |
| imgOptions.setVerticalResolution(200); | |
| imgOptions.setHorizontalResolution(200); | |
| // Set the image's format | |
| imgOptions.setImageType(ImageType.JPEG); | |
| // One page per sheet is enabled | |
| imgOptions.setOnePagePerSheet(true); | |
| // Get the first worksheet | |
| Worksheet sheet = book.getWorksheets().get(0); | |
| // Render the sheet with respect to specified image/print options | |
| SheetRender sr = new SheetRender(sheet, imgOptions); | |
| // Render the image for the sheet | |
| sr.toImage(0, dataDir + "mythumb.jpg"); | |
| // Creating Thumbnail | |
| java.awt.Image img = ImageIO.read(new File(dataDir + "mythumb.jpg")).getScaledInstance(100, 100, BufferedImage.SCALE_SMOOTH); | |
| BufferedImage img1 = new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB); | |
| img1.createGraphics().drawImage( | |
| ImageIO.read(new File(dataDir + "mythumb.jpg")).getScaledInstance(100, 100, img.SCALE_SMOOTH), 0, 0, null); | |
| ImageIO.write(img1, "jpg", new File(dataDir + "GTOfWorksheet_out.jpg")); |