核心代碼如下:
通過自己編寫的模板加上一些Map參數創建Html PDF Excel報表
private void generateReportByMap(){
// 通過URL獲取模板
File reportTemplate = new File("D:/Myeclipse/Learn/Report/test.jasper");
// 設置文件路徑與名稱
String filePath = reportTemplate.getParent();
String fileName = reportTemplate.getName().split("\\.")[0];
// 初始化傳入iReport模板的Map參數
HashMap<String,String> parameterMap = new HashMap<String,String>();
parameterMap.put("name", "Maven");
parameterMap.put("desc", "a man");
// 創建空的數據源
JRDataSource dataSource = new JREmptyDataSource();
try {
// 通過模板、Map參數、數據源 創建Jasper對象,使用這個對象可以創建導出各種格式文件的實例對象
JasperPrint jasperPrint = JasperFillManager.fillReport(reportTemplate.getPath(),parameterMap, dataSource);
// 通過Jasper對象創建指定的Excel文件導出對象
JExcelApiExporter exporter = new JExcelApiExporter();
// 設置導出文件的相關信息,並且導出文件在指定目錄下(在這裏指reportName所指的的目錄)
String reportName = filePath+"\\"+fileName+".xls";
exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,reportName);
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.exportReport();
/*
reportName = filePath+"\\"+fileName+".html";
JasperExportManager.exportReportToHtmlFile(jasperPrint, reportName);
reportName = filePath+"\\"+fileName+".pdf";
JasperExportManager.exportReportToPdfFile(jasperPrint, reportName);
*/
reportName = filePath+"\\"+fileName+".html";
JRHtmlExporter htmlReport = new JRHtmlExporter();
htmlReport.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,reportName);
htmlReport.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
htmlReport.exportReport();
reportName = filePath+"\\"+fileName+".pdf";
JRPdfExporter pdfReport = new JRPdfExporter();
pdfReport.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,reportName);
pdfReport.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
pdfReport.exportReport();
} catch (JRException e) {
e.printStackTrace();
}
}
報表導出後,使用瀏覽器下載報表:(InputStream 是指導出後報表的輸入流,showName 是指瀏覽器中看到的文件名)
public static void downloadReport(InputStream in, String showName,
HttpServletResponse response,HttpServletRequest request) throws FileNotFoundException {
try {
response.reset();
response.setContentType("application/x-msdownload"); //
if (showName != null) {
response.setContentType("application/x-download");
String agent = request.getHeader("USER-AGENT").toLowerCase();
if (null != agent && -1 != agent.indexOf("msie")) {
showName = URLEncoder.encode(showName, "UTF8");
} else if (null != agent && -1 != agent.indexOf("firefox")) {
showName = MimeUtility.encodeText(showName, "UTF8", "B");
}else{
showName = URLEncoder.encode(showName, "UTF8");
}
response.setHeader("Content-Disposition", "attachment;filename=" + showName);
}
byte[] bytes = new byte[2048];
int readLenGth = 0;
int length = 0;
while ((readLenGth = in.read(bytes)) > 0) {
response.getOutputStream().write(bytes, 0, readLenGth); // 向瀏覽器輸出\r
length += readLenGth;
}
in.close();
response.setContentLength(length); // 設置輸入文件長度
response.getOutputStream().flush();
} catch (Exception e) {
e.printStackTrace();
}
}
核心API: