下面的代码得到一个byte []结果,适用于PDF和XLSX.对于
HTML,引发了异常.
JasperPrint jasperPrint = JasperFillManager.fillReport(report,params,dataSource != null ? new JRMapArrayDataSource(
dataSource) : new JREmptyDataSource());
ByteArrayOutputStream out = new ByteArrayOutputStream();
@SuppressWarnings("rawtypes")
Exporter exporter;
switch (format) {
case PDF:
exporter = new JRPdfExporter();
break;
case XLSX:
exporter = new JRXlsxExporter();
break;
case HTML:
exporter = new HtmlExporter();
break;
default:
throw new ReportException("Unknown export format");
}
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(out));
exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
exporter.exportReport();
return out.toByteArray();
HTML的例外是exporter.exportReport();这条线说
java.lang.ClassCastException: net.sf.jasperreports.export.SimpleOutputStreamExporterOutput cannot be cast to net.sf.jasperreports.export.HtmlExporterOutput at net.sf.jasperreports.engine.export.HtmlExporter.exportReport(HtmlExporter.java:232)
v6.0和v5.6的错误相同.这曾经在v5.0中工作(某些类在v5.6中已弃用).
如何以各种格式导出报告,包括HTML？
解决方法
对于HTML和其他格式：
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.export.HtmlExporter;
import net.sf.jasperreports.engine.export.JRCsvExporter;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.export.JRXmlExporter;
import net.sf.jasperreports.export.Exporter;
import net.sf.jasperreports.export.SimpleExporterInput;
import net.sf.jasperreports.export.SimpleHtmlExporterOutput;
import net.sf.jasperreports.export.SimpleOutputStreamExporterOutput;
public byte[] export(final JasperPrint print) throws JRException {
final Exporter exporter;
final ByteArrayOutputStream out = new ByteArrayOutputStream();
boolean html = false;
switch (getReportFormat()) {
case HTML:
exporter = new HtmlExporter();
exporter.setExporterOutput(new SimpleHtmlExporterOutput(out));
html = true;
break;
case CSV:
exporter = new JRCsvExporter();
break;
case XML:
exporter = new JRXmlExporter();
break;
case XLSX:
exporter = new JRXlsxExporter();
break;
case PDF:
exporter = new JRPdfExporter();
break;
default:
throw new JRException("Unknown report format: " + getReportFormat().toString());
}
if (!html) {
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(out));
}
exporter.setExporterInput(new SimpleExporterInput(print));
exporter.exportReport();
return out.toByteArray();
}
用它来调用：
JasperPrint print = JasperFillManager.fillReport(report,parameters,dataSource); byte report[] = export(print);
