使用 ImageOrPrintOptions 将工作表和工作簿转换为图像

概述

有时候,您可能需要将工作表呈现为图形表示。您可能需要将工作表图像嵌入到应用程序或网页中。您可能需要将图像插入到Word文档、PDF文件、PowerPoint演示文稿中,或者在某些其他情景中使用。简单来说,您希望将工作表呈现为图像,以便在别处使用。Aspose.Cells支持将Excel文件中的工作表转换为图像。此外,Aspose.Cells支持设置不同选项,如图像格式、分辨率(垂直和水平)、图像质量以及其他图像和打印选项。

该 API 提供了一些有价值的类,例如 SheetRenderImageOrPrintOptionsWorkbookRender 等。

SheetRender类处理渲染工作表图像的任务,而WorkbookRender类则处理工作簿的渲染。上述两个类都有多个重载版本的toImage方法,可以直接将工作表或工作簿转换为指定属性或选项的图像文件。您可以将图像文件保存到磁盘/流中。支持多种图像格式,例如BMP,PNG,GIFF,JPEG,TIFF,EMF等。

将工作表转为图像

// 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(ConvertWorksheettoImage.class) + "TechnicalArticles/";
//Instantiate a new Workbook object
//Open template
Workbook book = new Workbook(dataDir + "book1.xlsx");
//Get the first worksheet
Worksheet sheet = book.getWorksheets().get(0);
//Apply different Image and Print options
ImageOrPrintOptions options = new ImageOrPrintOptions();
//Set Horizontal Resolution
options.setHorizontalResolution(300);
//Set Vertical Resolution
options.setVerticalResolution(300);
//Set TiffCompression
options.setTiffCompression(TiffCompression.COMPRESSION_LZW);
//Set Image Format
options.setImageType(ImageType.TIFF);
//Set printing page type
options.setPrintingPage(PrintingPageType.DEFAULT);
//Render the sheet with respect to specified image/print options
SheetRender sr = new SheetRender(sheet, options);
//Render/save the image for the sheet
sr.toImage(0, dataDir + "CWorksheettoImage_out.tiff");

转换选项

可以保存特定页面到图像。下面的代码将工作簿中的第一个和第二个工作表转换为JPG图像。

// 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(ConversionOptions.class) + "TechnicalArticles/";
// Instantiate a new Workbook object
// Open template
Workbook book = new Workbook(dataDir + "book1.xlsx");
// Get the first worksheet
Worksheet sheet = book.getWorksheets().get(0);
// Apply different Image and Print options
ImageOrPrintOptions options = new ImageOrPrintOptions();
// Set Horizontal Resolution
options.setHorizontalResolution(300);
// Set Vertical Resolution
options.setVerticalResolution(300);
// Set Image Format
options.setImageType(ImageType.JPEG);
// If you want entire sheet as a single image
options.setOnePagePerSheet(true);
// Render the sheet with respect to specified image/print options
SheetRender sr = new SheetRender(sheet, options);
// Render/save the image for the sheet
sr.toImage(0, dataDir + "ConversionOptions_out.jpg");

或者您可以循环遍历工作簿,并将其中的每个工作表渲染为单独的图像:

// 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(WorksheetToSeparateImage.class) + "TechnicalArticles/";
// Instantiate a new Workbook object
// Open template
Workbook book = new Workbook(dataDir + "book1.xlsx");
// Iterate over all worksheets in the workbook
for (int i = 0; i < book.getWorksheets().getCount(); i++) {
Worksheet sheet = book.getWorksheets().get(i);
// Apply different Image and Print options
ImageOrPrintOptions options = new ImageOrPrintOptions();
// Set Horizontal Resolution
options.setHorizontalResolution(300);
// Set Vertical Resolution
options.setVerticalResolution(300);
// Set Image Format
options.setImageType(ImageType.JPEG);
// If you want entire sheet as a single image
options.setOnePagePerSheet(true);
// Render to image
SheetRender sr = new SheetRender(sheet, options);
sr.toImage(0, dataDir + "WSheetToSImage_out-" + sheet.getName() + ".jpg");
}

将工作簿转为图像

要将完整的工作簿渲染为图像格式,您可以采用上述方法,也可以简单地使用接受WorkbookRender类的实例以及Workbook对象的ImageOrPrintOptions对象。

您可以将整个工作簿保存到包含多帧或多页的单个TIFF图像中:

// 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(ConvertWorkbooktoImage.class) + "TechnicalArticles/";
// Instantiate a new Workbook object
Workbook book = new Workbook(dataDir + "book1.xlsx");
// Apply different Image and Print options
ImageOrPrintOptions options = new ImageOrPrintOptions();
// Set Image Format
options.setImageType(ImageType.TIFF);
// If you want entire sheet as a single image
options.setOnePagePerSheet(true);
// Render to image
WorkbookRender render = new WorkbookRender(book, options);
render.toImage(dataDir + "CWorkbooktoImage_out.tiff");

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