import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;


import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.JasperRunManager;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.util.JRLoader;








public class TestUtils {
 
public static void main(String[] args) throws JRException {
getFirst();
getPa();
}


private static void getFirst() throws JRException {
// 第一步：裝載jasper檔案
File jasperFileName = new File("c://test2.jasper");
// 第二步：設定引數值
/* 設定引數 */
HashMap<String, Object> params = new HashMap<String, Object>();// 建立引數表
params.put("name","我們的產品"); // 設定引數值
// 第三步：利用JasperRunManager生成PDF檔案
JasperRunManager.runReportToPdfFile(jasperFileName.getPath(),
params, new JREmptyDataSource());
}

private static void getPa() throws JRException{
JRPdfExporter jrpdf = new JRPdfExporter();
JasperReport report1 = (JasperReport) JRLoader.loadObject(new File("c://test.jasper"));
JasperReport report2 = (JasperReport) JRLoader.loadObject(new File("c://test2.jasper"));
List<String> list = new ArrayList<String>();
list.add("測試資料");
JRBeanCollectionDataSource ds1 = new JRBeanCollectionDataSource(list);
JRBeanCollectionDataSource ds2 = new JRBeanCollectionDataSource(list);
HashMap<String, Object> params = new HashMap<String, Object>();// 建立引數表
params.put("name", "我們的產品"); // 設定引數值

JasperPrint jasperPrint = JasperFillManager.fillReport(report1,params,ds1);
JasperPrint jasperPrint2 = JasperFillManager.fillReport(report2,params,ds2);
List jasperPrintList = new ArrayList();
jasperPrintList.add(jasperPrint);
jasperPrintList.add(jasperPrint2);

File file = new File("c://Test.pdf");

ByteArrayOutputStream baos = new ByteArrayOutputStream();
JRPdfExporter exporter = new JRPdfExporter();
exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, jasperPrintList);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
exporter.exportReport();
byte[] bytes = baos.toByteArray();
// 確定寫出檔案的位置
try {
// 建立輸出位元組流
FileOutputStream fos = new FileOutputStream(file);
// 用FileOutputStream 的write方法寫入位元組陣列
fos.write(bytes);
System.out.println("寫入成功");
// 為了節省IO流的開銷，需要關閉
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}



}