JasperReports 在Servlet环境下工具类
import java.io.IOException;import java.io.OutputStream;import java.io.PrintWriter;import java.net.URLEncoder;import java.util.List;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import net.sf.jasperreports.engine.JRAbstractExporter;import net.sf.jasperreports.engine.JRDataSource;import net.sf.jasperreports.engine.JRException;import net.sf.jasperreports.engine.JRExporterParameter;import net.sf.jasperreports.engine.JasperCompileManager;import net.sf.jasperreports.engine.JasperFillManager;import net.sf.jasperreports.engine.JasperPrint;import net.sf.jasperreports.engine.JasperReport;import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;import net.sf.jasperreports.engine.export.JExcelApiExporter;import net.sf.jasperreports.engine.export.JRHtmlExporter;import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;import net.sf.jasperreports.engine.export.JRPdfExporter;import net.sf.jasperreports.engine.export.JRRtfExporter;import net.sf.jasperreports.engine.export.JRXmlExporter;import net.sf.jasperreports.engine.util.JRLoader;import net.sf.jasperreports.j2ee.servlets.ImageServlet;/** * 使用jasperReport做报表时的工具支持类.有两个用途,生成jasperPrint对象,和设置导出时的session */public class ReportUtils {private HttpServletRequest request;private HttpServletResponse response;private HttpSession session;/** * 在其它web环境下构造此工具类对象 * * @param request * request请求对象 */public ReportUtils(HttpServletRequest request) {this.request = request;this.session = request.getSession();}public ReportUtils(HttpServletResponse response) {this.response = response;}public ReportUtils(HttpServletRequest request, HttpServletResponse response) {this(request);this.response = response;}/** * 获得JasperPrint对象;自定义填充报表时的parameter和dataSource. 参数说明和动态表头的用法参考上一方法 * * @param filePath * @param parameter * @param dataSource * @param sizeGroup * @return */public JasperPrint getJasperPrint(String filePath, Map parameter,JRDataSource dataSource) throws JRException {JasperReport jasperReport = null;try {jasperReport = (JasperReport) JRLoader.loadObject(filePath);return JasperFillManager.fillReport(jasperReport, parameter,dataSource);} catch (JRException e) {e.printStackTrace();}return null;}/** * 通过传入List类型数据源获取JasperPrint实例 * * @param filePath * jasper路径 * @param parameter * @param list * @return * @throws JRException */public JasperPrint getPrintWithBeanList(String filePath, Map parameter,List list) throws JRException {JRDataSource dataSource = new JRBeanCollectionDataSource(list);return getJasperPrint(filePath, parameter, dataSource);}/** * 传入类型，获取输出器 * * @param docType * @return */public JRAbstractExporter getJRExporter(DocType docType) {JRAbstractExporter exporter = null;switch (docType) {case PDF:exporter = new JRPdfExporter();break;case HTML:exporter = new JRHtmlExporter();break;case XLS:exporter = new JExcelApiExporter();break;case XML:exporter = new JRXmlExporter();break;case RTF:exporter = new JRRtfExporter();break;}return exporter;}public void setAttrToPage(JasperPrint jasperPrint, String report_fileName,String report_type) {session.setAttribute("REPORT_JASPERPRINT", jasperPrint);session.setAttribute("REPORT_FILENAME", report_fileName);session.setAttribute("REPORT_TYPE", report_type);}/** * 定义了报表输出类型，固定了可输出类型 * * @author Administrator * */public static enum DocType {PDF, HTML, XLS, XML, RTF}/** * 编译报表模板文件jaxml，生成jasper二进制文件 * * @param jaxmlPath * @param jasperPath * @throws JRException */public void complieJaxml(String jaxmlPath, String jasperPath)throws JRException {JasperCompileManager.compileReportToFile(jaxmlPath, jasperPath);}/** * 输出PDF 使用此方法，必须预先注入response * * @param jasperPath * @param params * @param sourceList * @param fileName * @throws JRException * @throws IOException * @throws ServletException */public void servletExportPDF(String jasperPath, Map params,List sourceList, String fileName) throws JRException, IOException,ServletException {servletExportDocument(DocType.PDF, jasperPath, params, sourceList,fileName);}/** * 输出html静态页面，必须注入request和response * * @param jasperPath * @param params * @param sourceList * @param imageUrl * 报表文件使用的图片路径，比如 ../servlets/image?image= * @throws JRException * @throws IOException * @throws ServletException */public void servletExportHTML(String jasperPath, Map params,List sourceList, String imageUrl) throws JRException, IOException,ServletException {response.setContentType("text/html");response.setCharacterEncoding("UTF-8");JRAbstractExporter exporter = getJRExporter(DocType.HTML);JasperPrint jasperPrint = getPrintWithBeanList(jasperPath, params,sourceList);session.setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE,jasperPrint);PrintWriter out = response.getWriter();exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, imageUrl);exporter.exportReport();}/** * 输出Excel报表文件 * * @param jasperPath * @param params * @param sourceList * @param fileName * @throws JRException * @throws IOException * @throws ServletException */public void servletExportExcel(String jasperPath, Map params,List sourceList, String fileName) throws JRException, IOException,ServletException {servletExportDocument(DocType.XLS, jasperPath, params, sourceList,fileName);// 要想获得更好的视觉效果，可以添加以下代码// // exporter.setParameter(// // JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,// // Boolean.TRUE); // 删除记录最下面的空行// //// exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,// // Boolean.FALSE);// 删除多余的ColumnHeader// //// exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND// ,// // Boolean.FALSE);// 显示边框}/** * 生成不同格式报表文档 * * @param docType * 文档类型 * @param jasperPath * @param params * @param sourceList * @param fileName * @throws JRException * @throws IOException * @throws ServletException */public void servletExportDocument(DocType docType, String jasperPath,Map params, List sourceList, String fileName) throws JRException,IOException, ServletException {if (docType == DocType.HTML) {servletExportHTML(jasperPath, params, sourceList, fileName);return;}JRAbstractExporter exporter = getJRExporter(docType);// 获取后缀String ext = docType.toString().toLowerCase();if (!fileName.toLowerCase().endsWith(ext)) {fileName += "." + ext;}// 判断资源类型String contentType = "application/";if (ext.equals("xls")) {ext = "excel";} else if (ext.equals("xml")) {contentType = "text/";}contentType += ext;response.setContentType(contentType);response.setHeader("Content-Disposition", "attachment; filename=""+ URLEncoder.encode(fileName, "UTF-8") + """);exporter.setParameter(JRExporterParameter.JASPER_PRINT,getPrintWithBeanList(jasperPath, params, sourceList));OutputStream ouputStream = response.getOutputStream();exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);try {exporter.exportReport();} catch (JRException e) {throw new ServletException(e);} finally {if (ouputStream != null) {try {ouputStream.close();} catch (IOException ex) {}}}}}?当前代码在Servlet环境下使用,仅仅传入jasper路径，LIST类型数据源，以及其它参数即可完成报表的输出。