import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporter;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.base.JRBaseReport;
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.JRRtfExporter;
import net.sf.jasperreports.engine.export.JRXlsExporter;
import net.sf.jasperreports.engine.export.JRXlsExporterParameter;
import net.sf.jasperreports.engine.util.JRLoader;

public class JasperExportUtils
{
public static void prepareReport(JasperReport jasperReport, String type) {
    /*
     * 如果导出的是excel，则需要去掉周围的margin
     */
    if ("excel".equals(type))
     try {
      Field margin = JRBaseReport.class
        .getDeclaredField("leftMargin");
      margin.setAccessible(true);
      margin.setInt(jasperReport, 0);
      margin = JRBaseReport.class.getDeclaredField("topMargin");
      margin.setAccessible(true);
      margin.setInt(jasperReport, 0);
      margin = JRBaseReport.class.getDeclaredField("bottomMargin");
      margin.setAccessible(true);
      margin.setInt(jasperReport, 0);
      Field pageHeight = JRBaseReport.class
        .getDeclaredField("pageHeight");
      pageHeight.setAccessible(true);
      pageHeight.setInt(jasperReport, 2147483647);
     } catch (Exception exception) {
     }
   }

   /**
    * 导出excel
    */
   public static void exportExcel(JasperPrint jasperPrint,
     HttpServletRequest request, HttpServletResponse response) throws IOException, JRException {
     /*
      * 设置头信息
      */
     response.setContentType("application/vnd.ms-excel");
     String fileName = new String("未命名.xls".getBytes("GBK"), "ISO8859_1");
     response.setHeader("Content-disposition", "attachment; filename="
       + fileName);

     ServletOutputStream ouputStream = response.getOutputStream();
     JRXlsExporter exporter = new JRXlsExporter();
     exporter
       .setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
     exporter.setParameter(JRExporterParameter.OUTPUT_STREAM,
       ouputStream);
     exporter.setParameter(
       JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,
       Boolean.TRUE);
     exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,
       Boolean.FALSE);
     exporter.setParameter(
       JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,
       Boolean.FALSE);
     exporter.exportReport();
     ouputStream.flush();
     ouputStream.close();
   }

   /**
    * 导出pdf，注意此处中文问题， 1）在ireport的classpath中加入iTextAsian.jar
    * 2）在ireport画jrxml时，pdf font name ：STSong-Light ，pdf encoding ：
    * UniGB-UCS2-H
    */
   public static void exportPdf(JasperPrint jasperPrint,
     HttpServletRequest request, HttpServletResponse response) throws IOException, JRException {
     response.setContentType("application/pdf");
     String fileName = new String("未命名.pdf".getBytes("GBK"), "ISO8859_1");
     response.setHeader("Content-disposition", "attachment; filename="
       + fileName);
     ServletOutputStream ouputStream = response.getOutputStream();
     JasperExportManager.exportReportToPdfStream(jasperPrint,
       ouputStream);
     ouputStream.flush();
     ouputStream.close();
   }

   /**
    * 导出html
    */
   public static void exportHtml(JasperPrint jasperPrint,
     HttpServletRequest request, HttpServletResponse response) throws IOException, JRException {
     response.setContentType("text/html");
     ServletOutputStream ouputStream = response.getOutputStream();
     JRHtmlExporter exporter = new JRHtmlExporter();
     exporter.setParameter(
       JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,
       Boolean.FALSE);
     exporter
       .setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
     exporter.setParameter(JRExporterParameter.CHARACTER_ENCODING,
       "UTF-8");
     exporter.setParameter(JRExporterParameter.OUTPUT_STREAM,
       ouputStream);

     exporter.exportReport();

     ouputStream.flush();
     ouputStream.close();
   }

   /**
    * 导出word
    */
   public static void exportWord(JasperPrint jasperPrint,
     HttpServletRequest request, HttpServletResponse response)
     throws JRException, IOException {
    response.setContentType("application/msword;charset=utf-8");
    String fileName = new String("未命名.doc".getBytes("GBK"), "ISO8859_1");
    response.setHeader("Content-disposition", "attachment; filename="
      + fileName);
    JRExporter exporter = new JRRtfExporter();
    exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
    exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, response
      .getOutputStream());

    exporter.exportReport();
   }

   /**
    * 打印
    */
   public static void exportPrint(JasperPrint jasperPrint,
     HttpServletResponse response, HttpServletRequest request)
     throws IOException {
    response.setContentType("application/octet-stream");
    ServletOutputStream ouputStream = response.getOutputStream();
    ObjectOutputStream oos = new ObjectOutputStream(ouputStream);
    oos.writeObject(jasperPrint);
    oos.flush();
    oos.close();
    ouputStream.flush();
    ouputStream.close();
   }

   /**
    * 按照类型导出不同格式文件
    *
    * @param datas
    *            数据
    * @param type
    *            文件类型
    * @param is
    *            jasper文件的来源
    * @param request
    * @param response
    */
   public static void export(Collection datas, String type, InputStream is,
     HttpServletRequest request, HttpServletResponse response) {
    try {
     JasperReport jasperReport = (JasperReport) JRLoader.loadObject(is);
     prepareReport(jasperReport, type);
     JRDataSource ds = new JRBeanCollectionDataSource(datas, false);
     Map parameters = new HashMap();
     JasperPrint jasperPrint = JasperFillManager.fillReport(
       jasperReport, parameters, ds);

     if (EXCEL_TYPE.equals(type)) {
      exportExcel(jasperPrint, request, response);
     } else if (PDF_TYPE.equals(type)) {
      exportPdf(jasperPrint, request, response);
     } else if (HTML_TYPE.equals(type)) {
      exportHtml(jasperPrint, request, response);
     } else if (WORD_TYPE.equals(type)) {
      exportWord(jasperPrint, request, response);
     }
    } catch (Exception e) {
     e.printStackTrace();
    }
   }

   public static final String PRINT_TYPE = "print";
   public static final String PDF_TYPE = "pdf";
   public static final String EXCEL_TYPE = "excel";
   public static final String HTML_TYPE = "html";
   public static final String WORD_TYPE = "word";

}