就像所有与在Swing中执行长时间运行或阻塞任务有关的问题一样，从Swing中的并发开始，以更好地了解您要解决的问题。接下来看看最常见的解决方案Worker Threads和SwingWorker
例如：
public static class JasperReportsWorker extends SwingWorker<JasperReport, JasperReport> {
@Override
protected JasperReport doInBackground() throws Exception {
JasperReport report = null;
try {
String reportquery = "Select * from invoices ";
JasperDesign jasperdesign = JRXmlLoader.load("StatementReport.jrxml");
JRDesignQuery designquery = new JRDesignQuery();
designquery.setText(reportquery);
jasperdesign.setQuery(designquery);
report = JasperCompileManager.compileReport(jasperdesign);
} finally {
try {
rs.close();
pst.close();
} catch (sqlException ex) {
ex.printStackTrace();
}
}
return report;
}
}
然后可以使用类似：
JasperReportsWorker worker = new JasperReportsWorker();
JDialog dialog = new JDialog();
dialog.setModal(true);
dialog.add(new JLabel("Working..."));
dialog.pack();
dialog.setLocationRelativeTo(null);
worker.addPropertychangelistener(new Propertychangelistener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
String name = evt.getPropertyName();
JasperReportsWorker worker = (JasperReportsWorker) evt.getSource();
if ("state".equalsIgnoreCase(name)) {
switch (worker.getState()) {
case DONE:
if (dialog != null) {
dialog.setVisible(false);
}
try {
JasperReport report = worker.get();
JasperPrint jasperprint = JasperFillManager.fillReport(jasperreport, null, con);
JasperViewer.viewReport(jasperprint, false);
} catch (InterruptedException | ExecutionException ex) {
ex.printStackTrace();
}
break;
}
}
}
});
worker.execute();
dialog.setVisible(true);
这些是围绕基本概念的多种变体，请随时尝试
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