Java使用IReport可以导出pdf, doc ,excel ,html格式的复杂报表。针对doc格式的文件，使用JRRtfExporter实现类进行导出，如此方能保留完整样式。使用JRDocxExporter实现类导出报表会出现文字线条丢失问题。

RTF格式又叫富文本格式或者多文本格式，RTF是Rich Text Format的缩写，意即丰富的文本格式。在rtf文档中可以嵌入图像等文件，RTF是word为了与其他字处理软件兼容而能够保存的文档格式，类似 DOC格式(Word文档)的文件，有很好的兼容性。

下面是报表导出工具类,需要导出以上格式的报表只需要调用本工具类中的方法即可。

工具类

package com.ntocc.util.ireport;import com.ntocc.config.RDSConnection;import net.sf.jasperreports.engine.*;import net.sf.jasperreports.engine.export.*;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import org.springframework.util.StringUtils;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.sql.Connection;import java.sql.DriverManager;import java.util.Map;/** * @author: 詹Sir * @date: 2022/08/31 * @Desc: :描述该类的主要功能 */@Componentpublic class IReportUtils {    /**     * 导出pdf     * @param jasperFile     * @param paramMap     * @param defaultFileName     * @param request     * @param response     * @throws IOException     * @throws JRException     */    public static void exportToPdf(String jasperFile, Map paramMap, String defaultFileName, HttpServletRequest request,                                   HttpServletResponse response) throws IOException, JRException {        if (StringUtils.isEmpty(defaultFileName)){            defaultFileName =  "export.pdf";        }else {            defaultFileName = defaultFileName + ".pdf";        }        String fileName = new String(defaultFileName.getBytes("GBK"), "ISO8859_1");        response.setHeader("Content-disposition", "attachment; filename="                + fileName);        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperFile,paramMap, getConn());        ServletOutputStream ouputStream = response.getOutputStream();        JasperExportManager.exportReportToPdfStream(jasperPrint, ouputStream);        ouputStream.flush();        ouputStream.close();    }    /**     * 导出doc文件     * @param jasperFile     * @param paramMap     * @param defaultFileName     * @param request     * @param response     * @throws IOException     * @throws JRException     */    public static void exportToDoc(String jasperFile, Map paramMap, String defaultFileName, HttpServletRequest request,                                   HttpServletResponse response) throws IOException, JRException {        if (StringUtils.isEmpty(defaultFileName)){            defaultFileName =  "export.doc";        }else {            defaultFileName = defaultFileName + ".doc";        }        String fileName = new String(defaultFileName.getBytes("GBK"), "ISO8859_1");        response.setHeader("Content-disposition", "attachment; filename="                + fileName);        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperFile,paramMap, getConn());        //设置导出输出流        JRExporter exporter = new JRRtfExporter();        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);        exporter.setParameter(JRExporterParameter.OUTPUT_STREAM,                response.getOutputStream());        exporter.exportReport();    }    /**     * 导出html文件     * @param jasperFile     * @param paramMap     * @param request     * @param response     * @throws IOException     * @throws JRException     */    public static void exportToHtml(String jasperFile, Map paramMap, HttpServletRequest request,                                   HttpServletResponse response) throws IOException, JRException {        response.setContentType("text/html");        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperFile,paramMap, getConn());        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);        //设置图片文件存放路径，此路径为服务器上的绝对路径        String imageDIR =request.getSession().getServletContext().getRealPath("/");        exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR_NAME, imageDIR);        //设置图片请求URI        String imageURI = request.getContextPath() + "/";        exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, imageURI);        //设置导出图片到图片存放路径        exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.TRUE);        exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);        exporter.exportReport();        ouputStream.flush();        ouputStream.close();    }    /**     * 导出xls文件     * @param jasperFile     * @param paramMap     * @param defaultFileName     * @param request     * @param response     * @throws IOException     * @throws JRException     */    public static void exportToExcel(String jasperFile, Map paramMap, String defaultFileName, HttpServletRequest request,                                   HttpServletResponse response) throws IOException, JRException {        if (StringUtils.isEmpty(defaultFileName)){            defaultFileName =  "export.xls";        }else {            defaultFileName = defaultFileName + ".xls";        }        String fileName = new String(defaultFileName.getBytes("GBK"), "ISO8859_1");        response.setHeader("Content-disposition", "attachment; filename="                + fileName);        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperFile,paramMap, getConn());        //设置导出输出流        ServletOutputStream ouputStream = response.getOutputStream();        JRXlsExporter exporter = new JRXlsExporter();        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);        exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);        // 删除记录最下面的空行        exporter.setParameter(                JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,                Boolean.TRUE);        // 删除多余的ColumnHeader        exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,                Boolean.FALSE);        // 显示边框        exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,                Boolean.FALSE);        exporter.exportReport();        ouputStream.flush();        ouputStream.close();    }