從Excel工作表生成包含多個工作表和大量數據的圖像？

Question

我正在使用aspose.cells生成Excel工作表的圖像，並且工作正常，但是當我嘗試生成包含4張工作表和大量數據的Excel文件時，會產生錯誤

OutOfHeapMemory

如果我把條件設置成比它讀取的excel數據少的excel，

Workbook workbook = new Workbook(sourceDir);
                            List<Worksheet> worksheets = getAllWorksheets(workbook);
                            if (worksheets != null) {
                                int noOfImages = 0;
                                for (Worksheet worksheet : worksheets) {
                                    if (worksheet.getCells().getCount() > 0 || worksheet.getCharts().getCount() > 0 || worksheet.getPictures().getCount() > 0) {
                                        System.out.println("Worksheet Before Condition" + worksheet);                                        
                                        if (worksheet.getCells().getCount() < 2000) {
                                            System.out.println("Worksheet After Condition" + worksheet);
                                            String imageFilePath = workingDir + File.separator + projectName + File.separator + fileName + "_" + (noOfImages++) + ".png";
                                            SheetRender sr = new SheetRender(worksheet, getImageOrPrintOptions());
                                            sr.toImage(0, imageFilePath);
                                        }
                                    }
                                }
                            }

我在if條件之前和之后使用System.out.println來檢查循環迭代的工作表。

Worksheet Before ConditionAspose.Cells.Worksheet[ Details of Indian Companies Reg ]
Worksheet Before ConditionAspose.Cells.Worksheet[ LLP'S Incorporated in Jun ]
Worksheet Before ConditionAspose.Cells.Worksheet[ Foreign Companies Registered  ]
Worksheet After ConditionAspose.Cells.Worksheet[ Foreign Companies Registered  ]

Answer 1

請注意以下示例代碼供您參考，它將為第一張工作表的不同頁面生成一系列圖像：

樣例代碼：

// Instantiate a new workbook with path to an Excel file
Workbook book = new Workbook(dataDir + “MyTestBook1.xlsx”);

// Create an object for ImageOptions
ImageOrPrintOptions imgOptions = new ImageOrPrintOptions();

// Set the image type
imgOptions.setImageFormat(ImageFormat.getPng());

// Get the first worksheet.
Worksheet sheet = book.getWorksheets().get(0);

// Create a SheetRender object for the target sheet
SheetRender sr = new SheetRender(sheet, imgOptions);
for (int j = 0; j < sr.getPageCount(); j++) {
// Generate an image for the worksheet
sr.toImage(j, dataDir + “WToImage-out” + j + “.png”);
}
// Print message
System.out.println(“Images generated successfully.”);

如果您仍然發現任何問題或困惑，請提供您的模板文件並粘貼示例代碼（可運行）以顯示問題，我們將盡快進行檢查。

注意：我在Aspose擔任技術支持/開發人員。