Question

我正在使用jasper报告创建报告。当我创建具有12000条记录的报告（pdf，xls）时，它工作正常，但是当我创建具有40000记录堆内存问题的报告时。问题只在于xls格式。 pdf格式工作正常。我的代码如下。

Map hm = new HashMap();
JasperPrint print = null;
JRSwapFileVirtualizer virtualizer = null;
    JRSwapFile swapFile = new JRSwapFile("D://", 2048, 1024);
virtualizer = new JRSwapFileVirtualizer(2,swapFile,true);
JRVirtualizationHelper.setThreadVirtualizer(virtualizer);
hm.put(JRParameter.REPORT_VIRTUALIZER, virtualizer);
JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(
                    list);
JRExporter exporter = null;
            if (type.toUpperCase().equalsIgnoreCase(FileTypes.PDF.name())) {
                exporter = new JRPdfExporter();

            } else if (type.toUpperCase().equalsIgnoreCase(FileTypes.XLS.name())) {
                exporter = new JRXlsExporter();
            }

            if(exporter != null)
            {
                exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,
                        outFileName);
                exporter.setParameter(JRExporterParameter.JASPER_PRINT, print);
                exporter.exportReport();
            }

Answer 1

我找到了这个问题的解决方案。我已将IS IGNORE PAGINATION添加到xls文件中，因此它可以正常工作。

Map hm = new HashMap();
JasperPrint print = null;
JRSwapFileVirtualizer virtualizer = null;
JRSwapFile swapFile = new JRSwapFile("D://", 2048, 1024);
virtualizer = new JRSwapFileVirtualizer(2,swapFile,true);
JRVirtualizationHelper.setThreadVirtualizer(virtualizer);
hm.put(JRParameter.REPORT_VIRTUALIZER, virtualizer);
if (type.toUpperCase().equalsIgnoreCase(FileTypes.XLS.name()))
{
    hm.put(JRParameter.IS_IGNORE_PAGINATION, new Boolean(false));
}
JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(
                    list);
JRExporter exporter = null;
            if (type.toUpperCase().equalsIgnoreCase(FileTypes.PDF.name())) {
                exporter = new JRPdfExporter();

            } else if (type.toUpperCase().equalsIgnoreCase(FileTypes.XLS.name())) {
                exporter = new JRXlsExporter();
            }

            if(exporter != null)
            {
                exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,
                        outFileName);
                exporter.setParameter(JRExporterParameter.JASPER_PRINT, print);
                exporter.exportReport();
            }

使用xls格式创建jasper报告时出现内存错误

1 个答案: