STACKOVERFLOW - мой конечный пункт назначения для моих вопросов.Форум Vaadin очень тихий, и в динамических отчетах нет форума.
У меня проблема с интеграцией динамических отчетов, основанных на jasperreport, с классом vaadin с именем "Embedded".Класс "Embedded" нуждается в объекте StreamResource, и все будет завершено с помощью функции getStream (), которая в моем случае никогда не будет вызвана.
Вот мой код:
//
//
//
public void build(Application app) throws IOException, DRException {
final JasperReportBuilder report = DynamicReports.report();
report.addColumn(Columns.column("Item", "item", DataTypes.stringType()));
report.addColumn(Columns.column("Quantity", "quantity", DataTypes.integerType()));
report.addColumn(Columns.column("Unit price", "unitprice", DataTypes.bigDecimalType()));
report.addTitle(Components.text("Getting started"));
report.addPageFooter(Components.pageXofY());
report.setDataSource(createDataSource());
StreamResource.StreamSource resstream = new filePDF(report);
StreamResource ress = new StreamResource(resstream, "abc.pdf", app);
//
ress.setMIMEType("application/pdf");
//
Embedded c = new Embedded("Title", ress);
c.setSource(ress);
c.setMimeType("application/pdf");
c.setType(Embedded.TYPE_BROWSER);
c.setSizeFull();
c.setHeight("800px");
c.setParameter("Content-Disposition", "attachment; filename=" + ress.getFilename());
//
app.getMainWindow().removeAllComponents();
app.getMainWindow().addComponent(c);
}
//
//
//
private JRDataSource createDataSource() {
DataSource dataSource = new DataSource("item", "quantity", "unitprice");
dataSource.add("Notebook", 1, new BigDecimal(500));
dataSource.add("DVD", 5, new BigDecimal(30));
dataSource.add("DVD", 1, new BigDecimal(28));
dataSource.add("DVD", 5, new BigDecimal(32));
dataSource.add("Book", 3, new BigDecimal(11));
dataSource.add("Book", 1, new BigDecimal(15));
dataSource.add("Book", 5, new BigDecimal(10));
dataSource.add("Book", 8, new BigDecimal(9));
return (JRDataSource) dataSource;
}
это класс "filePDF":
/**
*
*/
package com.example.postgrekonek;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import net.sf.dynamicreports.jasper.builder.JasperReportBuilder;
import net.sf.dynamicreports.report.exception.DRException;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperRunManager;
import com.vaadin.Application;
import com.vaadin.terminal.StreamResource;
/**
* @author hehehe
*
*/
public class filePDF implements StreamResource.StreamSource {
private JasperReportBuilder report;
//
public filePDF(final JasperReportBuilder rpt) {
report = rpt;
}
@Override
public InputStream getStream() {
//
ByteArrayOutputStream os = new ByteArrayOutputStream();
//
//os.write(JasperRunManager.runReportToPdf(report.toJasperReport(), new HashMap()));
try {
report.toPdf(os);
try {
os.flush();
} catch (IOException e) {
//
e.printStackTrace();
}
} catch (DRException e) {
//
e.printStackTrace();
}
return new ByteArrayInputStream(os.toByteArray());
}
}
А это класс "Источник данных":
/* Dynamic reports - Free Java reporting library for creating reports dynamically
*
* (C) Copyright 2010 Ricardo Mariaca
*
* http://dynamicreports.sourceforge.net
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package net.sf.dynamicreports.examples;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;
/**
* @author Ricardo Mariaca (dynamicreports@gmail.com)
*/
public class DataSource implements JRDataSource {
private String[] columns;
private List<Map<String, Object>> values;
private Iterator<Map<String, Object>> iterator;
private Map<String, Object> currentRecord;
public DataSource(String ...columns) {
this.columns = columns;
this.values = new ArrayList<Map<String, Object>>();
}
public void add(Object ...values) {
Map<String, Object> row = new HashMap<String, Object>();
for (int i = 0; i < values.length; i++) {
row.put(columns[i], values[i]);
}
this.values.add(row);
}
public Object getFieldValue(JRField field) throws JRException {
return currentRecord.get(field.getName());
}
public boolean next() throws JRException {
if (iterator == null) {
this.iterator = values.iterator();
}
boolean hasNext = iterator.hasNext();
if (hasNext) {
currentRecord = iterator.next();
}
return hasNext;
}
}