Apache POI autoColumnWidth java.lang.OutOfMemoryError：超出了GC开销限制

Question

我在Excel中包含1,28,237行和20列的所有列上调用OutOfMemoryError函数时，正在获取autoColumnWidth。我正在使用SXSSF api并将-Xms2048m -Xmx4096m -XX:PermSize=1024m -XX:MaxPermSize=2048m分配给JVM，但仍然没有成功。CPU利用率高达100％，我的系统RAM为6gb，在此过程中使用的内存为5.8gb，然后得到OutOfMemoryError。有什么解决办法吗？

有了这个，我可以想到一种解决方案，即为每列获取一个变量，找到最大长度，并在输入所有数据后最后将列设置为相应的变量。]​​>

还有其他解决方案吗？

创建Excel的代码

public static void createVideodataExcelFile(String excelPath, int maxRiskArea){

    FileOutputStream fileOut = null;
    XSSFWorkbook workbook = new XSSFWorkbook();

    CellStyle style = workbook.createCellStyle();
    XSSFFont font = workbook.createFont();
    font.setColor(HSSFColor.BLACK.index);
    font.setBold(true);
    style.setFont(font);
    int cellCount = 0;

    try {
        File file = new File(excelPath);

        if(file.createNewFile()){
            SXSSFWorkbook wb = new SXSSFWorkbook(workbook); 
            wb.setCompressTempFiles(true);
            Sheet sheet = wb.createSheet("GLE Video Data");
            int rowCount = sheet.getPhysicalNumberOfRows();
            //System.out.println("Row Count ="+rowCount);
            Row row = sheet.createRow(rowCount);

            Cell cell1 = row.createCell(cellCount);
            createCell(cell1, row, "CourseContent name", style, cellCount);
            createCell(cell1, row, "lang", style, ++cellCount);
            createCell(cell1, row, "CourseTitle", style, ++cellCount);
            createCell(cell1, row, "Audience", style, ++cellCount);
            createCell(cell1, row, "ContentRegion", style, ++cellCount);
            createCell(cell1, row, "CourseTitle", style, ++cellCount);
            createCell(cell1, row, "DeprecatedId", style, ++cellCount);
            createCell(cell1, row, "GleCode", style, ++cellCount);
            createCell(cell1, row, "Guid", style, ++cellCount);
            createCell(cell1, row, "LearningFormat", style, ++cellCount);

            for(int i = 0 ; i < maxRiskArea ; ++i){
                createCell(cell1, row, "RiskArea", style, ++cellCount);
            }

            createCell(cell1, row, "SalesforceId", style, ++cellCount);
            createCell(cell1, row, "Setting", style, ++cellCount);
            createCell(cell1, row, "SmsCode", style, ++cellCount);
            createCell(cell1, row, "pageID", style, ++cellCount);
            createCell(cell1, row, "title", style, ++cellCount);
            createCell(cell1, row, "ID", style, ++cellCount);
            createCell(cell1, row, "media_src", style, ++cellCount);
            createCell(cell1, row, "cuePoint", style, ++cellCount);
            createCell(cell1, row, "character", style, ++cellCount);
            createCell(cell1, row, "line", style, ++cellCount);

            fileOut = new FileOutputStream(excelPath);
            wb.write(fileOut);
            System.out.println("Excel Of GLE Data Created.");
        }


    } catch (IOException e) {
        errorLog.error("Excel Read/Write Error ="+e.getMessage());
        throw new GLEException(e);
    }
    finally{
        try {
            if(fileOut!=null)
            fileOut.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            errorLog.error("Excel Read/Write Error ="+e.getMessage());
            throw new GLEException(e);      

        }
    }
}

private static void createCell(Cell cell , Row row, String name, CellStyle style, int cellCount ){
    cell = row.createCell(cellCount);
    cell.setCellStyle(style);
    cell.setCellValue(name);
}

在我的Excel中包含1,28,237行和20列的所有列上调用autoColumnWidth函数时，我收到OutOfMemoryError。我正在使用SXSSF api并分配-Xms2048m -...

Answer 1

尝试在调用autoSizeColumn（columnIndex）之前在SXSSFSheet对象上调用trackAllColumnsForAutoSizing（），它将得到修复