import net.sf.jasperreports.engine.fill.JRSwapFileVirtualizer; //导入依赖的package包/类
@Before
public void init() {
	JasperReportBuilder report1 = report()
		.title(cmp.text("text1"))
		.pageFooter(cmp.pageNumber());
	JasperReportBuilder report2 = report()
		.title(cmp.text("text2"))
		.pageFooter(cmp.pageNumber());
	JasperReportBuilder report3 = report()
		.title(cmp.text("text3"))
		.pageFooter(cmp.pageNumber());

	JRSwapFile swapFile = new JRSwapFile(System.getProperty("java.io.tmpdir"), 2000, 5000);
	concatenatedReport = concatenatedReport(new JasperPrintListFileHandler(System.getProperty("java.io.tmpdir"), new JRSwapFileVirtualizer(3, swapFile)));
	concatenatedReport.continuousPageNumbering();
	concatenatedReport.concatenate(report1, report2, report3);
}
 

import net.sf.jasperreports.engine.fill.JRSwapFileVirtualizer; //导入依赖的package包/类
@Override
public void propertyChange(PropertyChangeEvent event) {
	super.propertyChange(event);
	if (event.getProperty().equals("field_editor_value")) { //$NON-NLS-1$
		if (event.getSource() == bfeUSE)
			enableVirtualizers((Boolean) event.getNewValue());
		else if (event.getSource() == cfeType) {
			isSwap = event.getNewValue().equals(JRSwapFileVirtualizer.class.getName());
			enableSwapVirtualizer(isSwap);
		} else if (event.getSource() == mnumrec)
			enableLimitRecords((Integer) event.getNewValue() >= 0);
		else if (event.getSource() == bLimRec)
			enableLimitRecords((Boolean) event.getNewValue());
	}
}