iReport,jasperReport报表打印

package com.appdev.bsf.server.servlet;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRAbstractExporter;
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.data.JRBeanCollectionDataSource;
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.JRXlsExporter;
import net.sf.jasperreports.engine.export.JRXlsExporterParameter;
import net.sf.jasperreports.engine.util.JRLoader;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.appdev.bsf.common.client.datasource.DictionaryGwtRpcService;

@SuppressWarnings("serial")
public class ReportServlet extends HttpServlet {
    private DictionaryGwtRpcService service;

    @Override
    public void init() throws ServletException {
        ServletContext application;
        WebApplicationContext wac;
        application = getServletContext();
        wac = WebApplicationContextUtils.getWebApplicationContext(application);
        service = (DictionaryGwtRpcService) wac.getBean("dictionaryGwtRpcServiceImpl");
    }

    @SuppressWarnings("deprecation")
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {
        JasperReport jReport = null;
        try {
            String jasperName = "";
            Map<String, Object> filter = new HashMap<String, Object>();

            String clsUrl = request.getParameter("clsUrl");
            String type = request.getParameter("type");
            String map = request.getParameter("map");

            if (clsUrl != null && !"".equals(clsUrl)) {
                String[] jasperNames = clsUrl.split("\\.");
                jasperName = jasperNames[jasperNames.length - 1];
            }

            if (map != null) {
                map = map.replace("{", "").replace("}", "");
                String maps[] = map.split(",");
                for (String str : maps) {
                    String[] obj = str.split("=");
                    if (obj.length == 2) {
                        filter.put(obj[0], obj[1]);
                    }
                }
            }
            if (type == null) {
                type = "Excel";
            }

            List<?> list = service.fetch(clsUrl, filter);
            if (list.size() > 0) {

                Map<String, String> paramMap = new HashMap<String, String>();
                paramMap.put("ReportTitle", jasperName);

                String filePath = request.getRealPath("/report/") + jasperName + ".jasper";
                File file = new File(filePath);
                InputStream is = new FileInputStream(file);
                JasperPrint jasperPrint = null;
                jReport = (JasperReport) JRLoader.loadObject(is);
                JRBeanCollectionDataSource jrDataSource = new JRBeanCollectionDataSource(list);

                jasperPrint = JasperFillManager.fillReport(jReport, paramMap, jrDataSource);

                OutputProcessed ouputProcessed = OutputProcessed.processOutput(type);
                JRAbstractExporter exporter = ouputProcessed.exporter;
                byte[] reportAsBytes;
                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
                exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);

                exporter.exportReport();

                reportAsBytes = baos.toByteArray();

                response.reset();
                // Writes the bytes[] in the response
                response.setContentType(ouputProcessed.contentType);
                response.setHeader("Content-Disposition", "inline; filename=" + jasperName
                        + ouputProcessed.fileType);
                response.setContentLength(reportAsBytes.length);

                ServletOutputStream s = response.getOutputStream();
                s.write(reportAsBytes, 0, reportAsBytes.length);

                s.flush();
                s.close();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}

class OutputProcessed {
    public JRAbstractExporter exporter;
    public String contentType;
    public String fileType;

    public static final String PDF = "PDF";
    public static final String HTML = "HTML";
    public static final String EXCEL = "Excel";
    public static final String RTF = "RTF";

    public static OutputProcessed processOutput(String output) {
        OutputProcessed result = new OutputProcessed();
        if (output.equals(PDF)) {
            result.contentType = "application/pdf";
            result.exporter = new JRPdfExporter();
            result.fileType = ".pdf";
        } else if (output.equals(HTML)) {
            result.contentType = "text/html";
            result.exporter = new JRHtmlExporter();
            result.exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
            result.fileType = ".html";
        } else if (output.equals(EXCEL)) {
            result.contentType = "application/vnd.ms-excel";
            result.exporter = new JRXlsExporter();
            result.exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);
            result.exporter.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,
                    Boolean.TRUE);
            result.fileType = ".xls";
        } else {
            result.contentType = "application/rtf";
            result.exporter = new JRRtfExporter();
            result.fileType = ".rtf";
        }
        return result;
    }
}