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"; }