java web报表，jasperReport使用简介

Bertha 。 2022-12-28 04:09 193阅读 0赞

转载请注明出处！！！

# jasperReport使用简介 #

需求简介：java web需生成报表，然后打印出来。报表用的jasperReport，编辑报表的可视化工具用的iReport。其次，web的打印是个比较棘手的问题，网上有很多第三方控件，经过不懈努力，找到了不少控件，但是支持直接打印（不跳预览）的免费版好像没有，无奈，用java手写了一个打印控件。

1.  控件实现的功能：自动使用客户端电脑的默认打印机打印出指定的文件。【直接打印（不展示预览）】。
2.  可指定双面打印。
3.  可执行文件。打开一次后自动设置成开机自启文件。

## 1.下载报表模板编辑器iReport ##

[iReport下载地址][iReport]。本人用的最新版本，就这也是2014年的了。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70][]

若你电脑的java环境是jdk8，则下载后应该会出现无法打开的情况。解决办法：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 2][]

## 2.做模板 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 4][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 5][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 6][]

红框内的组件是常用的，也是此教程中涉及到的组件。

若 组件面板 没有的话可以在 窗口-->组件面板 中打开。

![20201214142217413.png][]

### 设置静态文本（static text）即模板中不用在程序中赋值的文本。如：标题、表格头等等。 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 7][]

### 设置程序中赋值的文本（text field） ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 8][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 9][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 10][]

### 需要遍历的数据，模板制作方式： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 11][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 12][]

### 图片组件的添加 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 13][]

### 如果需要转为pdf，并且模板中涉及到中文，则需要设置下编码。 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 14][]

### 点击上方的preview按钮，即可将jrxml文件编译成jasper文件，如图。若无法出现下图所示，说明模板编译时出错，请认真检查！ ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 15][]

### 若出现 null ，解决办法： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 16][]

此时，与jrxml文件同级目录下回出现jasper文件。jrxml文件编译之后会产生jasper文件，类似于java文件编译后产生class文件。

![20201214152455214.png][]

## 3.java中操作jasperReport ##

### java操作jasperReport所需jar包 ###

其中pdf.freejar包为手动添加到本地maven的结果。[教程点此][Link 1]

<dependency>
                <groupId>spire</groupId>
                <artifactId>pdf.free</artifactId>
                <version>2.2.2</version>
            </dependency>
            
            
            
            <dependency>
                <groupId>net.sf.jasperreports</groupId>
                <artifactId>jasperreports</artifactId>
                <version>6.0.0</version>
            </dependency>
            <dependency>
                
                <groupId>com.itextpdf</groupId>
                <artifactId>itextpdf</artifactId>
                <version>5.5.11</version>
            </dependency>
            <dependency>
                <groupId>com.itextpdf</groupId>
                <artifactId>itext-pdfa</artifactId>
                <version>5.5.11</version>
            </dependency>
            <dependency>
                <groupId>com.itextpdf</groupId>
                <artifactId>itext-asian</artifactId>
                <version>5.2.0</version>
            </dependency>
            
            <dependency>
                <groupId>org.codehaus.groovy</groupId>
                <artifactId>groovy-all</artifactId>
                <version>2.4.13</version>
            </dependency>

### java操作jasperReport工具类 ###

package com.jdkj.detectSystem.Util;
    
    import net.sf.jasperreports.engine.*;
    import net.sf.jasperreports.engine.base.JRBaseReport;
    import net.sf.jasperreports.engine.export.*;
    import net.sf.jasperreports.engine.util.JRLoader;
    import net.sf.jasperreports.j2ee.servlets.ImageServlet;
    
    import javax.servlet.ServletOutputStream;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.io.PrintWriter;
    import java.lang.reflect.Field;
    import java.net.URLEncoder;
    import java.sql.Connection;
    import java.util.Map;
    
    /**
     * @Description: java操作jasperReport工具类
     * @Param:
     * @return:
     */
    @SuppressWarnings("deprecation")
    public class JasperHelper {
        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";
    
        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, String defaultFilename, HttpServletRequest request,
                                       HttpServletResponse response) throws IOException, JRException {
            /*
             * 设置头信息
             */
            response.setContentType("application/vnd.ms-excel");
            String defaultname = null;
            if (defaultFilename.trim() != null && defaultFilename != null) {
                defaultname = defaultFilename + ".xls";
            } else {
                defaultname = "export.xls";
            }
    
            response.setHeader("Content-Disposition",
                    "attachment; filename=\"" + URLEncoder.encode(defaultname, "UTF-8") + "\"");
    
            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); // 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
            exporter.exportReport();
            ouputStream.flush();
            ouputStream.close();
        }
    
        public static enum DocType {
            PDF, HTML, XLS, XML, RTF
        }
    
        @SuppressWarnings("rawtypes")
        public static 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;
        }
    
        /**
         * 导出pdf，注意此处中文问题，
         * 这里应该详细说：主要在ireport里变下就行了
         * 1）在ireport的classpath中加入iTextAsian.jar 2）在ireport画jrxml时，看ireport最左边有个属性栏。
         * 下边的设置就在点字段的属性后出现。 pdf font name ：STSong-Light ，pdf encoding ：UniGB-UCS2-H
         */
        private static void exportPdf(JasperPrint jasperPrint, String defaultFilename, HttpServletRequest request,
                                      HttpServletResponse response) throws IOException, JRException {
            response.setContentType("application/pdf");
            String defaultname = null;
            if (defaultFilename.trim() != null && defaultFilename != null) {
                defaultname = defaultFilename + ".pdf";
            } else {
                defaultname = "export.pdf";
            }
            String fileName = new String(defaultname.getBytes("GBK"), "ISO8859_1");
            response.setHeader("Content-disposition", "attachment; filename=" + fileName);
            ServletOutputStream ouputStream = response.getOutputStream();
            JasperExportManager.exportReportToPdfStream(jasperPrint, ouputStream);
            ouputStream.flush();
            ouputStream.close();
        }
    
        /**
         * @Description:
         * @Param: [defaultFilename 存储文件路径及名称, is 模板源文件,parameters map参数，conn 列表参数]
         * @Return: void
         * @Author: WQ
         * @Date: 2020/8/24
         */
        public static void exportPdfFile(String defaultFilename, File is, Map<String, Object> parameters, JRDataSource conn) {
            try {
                JasperReport jasperReport = (JasperReport) JRLoader.loadObject(is);
                prepareReport(jasperReport, "pdf");
                JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);
                JasperExportManager.exportReportToPdfFile(jasperPrint, defaultFilename);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        /**
         * @Description: 将jrxml文件编译成jasper文件
         * @Param: [jrxmlPath, jasperPath]
         * @Return: java.lang.String 返回jasper文件路径
         * @Author: WQ
         * @Date: 2020/8/24
         */
        public static String jrxmlToJasper(String jrxmlPath, String jasperPath) throws JRException, IOException {
            JasperCompileManager.compileReportToFile(jrxmlPath, jasperPath);
            return jasperPath;
        }
    
        /**
         * 导出html
         */
        private static void exportHtml(JasperPrint jasperPrint, String defaultFilename, 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);
            // 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word
         */
        @SuppressWarnings("rawtypes")
        private static void exportWord(JasperPrint jasperPrint, String defaultFilename, HttpServletRequest request,
                                       HttpServletResponse response) throws JRException, IOException {
            response.setContentType("application/msword;charset=utf-8");
            String defaultname = null;
            if (defaultFilename.trim() != null && defaultFilename != null) {
                defaultname = defaultFilename + ".doc";
            } else {
                defaultname = "export.doc";
            }
            String fileName = new String(defaultname.getBytes("GBK"), "utf-8");
            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();
        }
    
        /**
         * 按照类型导出不同格式文件
         *
         * @param type            文件类型
         * @param is              jasper文件的来源
         * @param request
         * @param response
         * @param defaultFilename 默认的导出文件的名称
         */
        public static void export(String type, String defaultFilename, File is, HttpServletRequest request,
                                  HttpServletResponse response, Map parameters, Connection conn) {
            try {
                JasperReport jasperReport = (JasperReport) JRLoader.loadObject(is);
                prepareReport(jasperReport, type);
    
                JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);
    
                if (EXCEL_TYPE.equals(type)) {
                    exportExcel(jasperPrint, defaultFilename, request, response);
                } else if (PDF_TYPE.equals(type)) {
                    exportPdf(jasperPrint, defaultFilename, request, response);
                } else if (HTML_TYPE.equals(type)) {
                    exportHtml(jasperPrint, defaultFilename, request, response);
                } else if (WORD_TYPE.equals(type)) {
                    exportWord(jasperPrint, defaultFilename, request, response);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        public static void export(String type, String defaultFilename, File is, HttpServletRequest request,
                                  HttpServletResponse response, Map parameters, JRDataSource conn) {
            try {
                JasperReport jasperReport = (JasperReport) JRLoader.loadObject(is);
                prepareReport(jasperReport, type);
    
                JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);
    
                if (EXCEL_TYPE.equals(type)) {
                    exportExcel(jasperPrint, defaultFilename, request, response);
                } else if (PDF_TYPE.equals(type)) {
                    exportPdf(jasperPrint, defaultFilename, request, response);
                } else if (HTML_TYPE.equals(type)) {
                    exportHtml(jasperPrint, defaultFilename, request, response);
                } else if (WORD_TYPE.equals(type)) {
                    exportWord(jasperPrint, defaultFilename, request, response);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 输出html静态页面，必须注入request和response
         *
         * @throws JRException
         * @throws IOException
         */
        public static void showHtml(String defaultFilename, String reportfile, HttpServletRequest request,
                                    HttpServletResponse response, Map parameters, JRDataSource conn) throws JRException, IOException {
    
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html");
    
            JRAbstractExporter exporter = getJRExporter(DocType.HTML);
    
            JasperPrint jasperPrint = JasperFillManager.fillReport(reportfile, parameters, conn);
            request.getSession().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.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
    
            // 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();
    
            out.flush();
    
        }
    
        public static void showHtml(String defaultFilename, String reportfile, HttpServletRequest request,
                                    HttpServletResponse response, Map parameters, Connection conn) throws JRException, IOException {
    
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html");
    
            JRAbstractExporter exporter = getJRExporter(DocType.HTML);
    
            JasperPrint jasperPrint = JasperFillManager.fillReport(reportfile, parameters, conn);
            request.getSession().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.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);
            // 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();
            out.flush();
    
        }
    
        @SuppressWarnings({"rawtypes", "unchecked"})
        public static void showPdf(String defaultFilename, String reportfile, HttpServletRequest request,
                                   HttpServletResponse response, Map parameters, JRDataSource conn) throws JRException, IOException {
    
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html");
            response.setContentType("application/pdf");
    
            JRAbstractExporter exporter = getJRExporter(DocType.PDF);
    
            JasperPrint jasperPrint = JasperFillManager.fillReport(reportfile, parameters, conn);
            request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);
    
            OutputStream out = response.getOutputStream();
    
            exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, out);
            exporter.exportReport();
            out.flush();
    
        }
    
        @SuppressWarnings({"rawtypes", "unchecked"})
        public static void showPdf(String defaultFilename, String reportfile, HttpServletRequest request,
                                   HttpServletResponse response, Map parameters, Connection conn) throws JRException, IOException {
    
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html");
            response.setContentType("application/pdf");
    
            JRAbstractExporter exporter = getJRExporter(DocType.PDF);
    
            JasperPrint jasperPrint = JasperFillManager.fillReport(reportfile, parameters, conn);
            request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);
    
            OutputStream out = response.getOutputStream();
    
            exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, out);
            exporter.exportReport();
            out.flush();
    
        }
    
    }

### 实际操作 ###

项目结构：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 17][]

### 核心操作类： ###

package com.wq.jasperReportDemo.service.impl;
    
    import com.wq.jasperReportDemo.entity.UserDO;
    import com.wq.jasperReportDemo.service.UserDOSercice;
    import com.wq.jasperReportDemo.util.JasperHelper;
    import lombok.SneakyThrows;
    import net.sf.jasperreports.engine.JRDataSource;
    import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
    import org.springframework.stereotype.Service;
    
    import java.io.File;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * @program: jasperReportDemo
     * @description: 用户操作业务层
     * @author: WQ
     **/
    @Service
    public class UserDOServiceImpl implements UserDOSercice {
    
    
        /**
         * @Description: 获取模板生成的pdf文件的路径
         * @Param: [jrxmlPath]
         * @return: java.lang.String
         * @Author: WQ
         * @Date: 2020/12/14
         */
        @SneakyThrows
        @Override
        public String getPdfPath(String jrxmlPath) {
            String imgPath = "C:\\Users\\19855\\Desktop\\jasperDemo\\img.jpg";
            String basePath = jrxmlPath.substring(0, jrxmlPath.length() - 7);
            //定义生成的pdf文件路径
            String pdfPath = basePath + ".pdf";
            //生成jasper文件路径
            String jasperPath = basePath + ".jasper";
            // jrxml文件编译成jasper文件
            JasperHelper.jrxmlToJasper(jrxmlPath, jasperPath);
            // 遍历数据渲染
            List<UserDO> list = new ArrayList<>();
            list.add(new UserDO("张三", "123"));
            list.add(new UserDO("李四", "456"));
            list.add(new UserDO("王五", "789"));
            //获取数据源
            JRDataSource jrDataSource = new JRBeanCollectionDataSource(list);
            // map数据渲染
            Map<String, Object> map = new HashMap<>();
            map.put("test", "测试字段");
            map.put("imgPath", imgPath);//图片也是传入图片的路径。传图片的base64字符串无法正常显示（本人测试过）
            //创建jasper文件
            File reportFile = new File(jasperPath);
            //调用工具类，导出pdf文件
            JasperHelper.exportPdfFile(pdfPath, reportFile, map, jrDataSource);
            return pdfPath;
        }
    }

### 测试方法 ###

@SpringBootTest
    class JasperReportDemoApplicationTests {
    
        @Autowired
        private UserDOSercice userDOSercice;
    
        @Test
        void contextLoads() {
            String pdfPath = userDOSercice.getPdfPath("C:\\Users\\19855\\Desktop\\jasperDemo\\report1.jrxml");
            System.out.println(pdfPath);
        }
    
    }

![20201214153126189.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 18][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 19][]

表格的边框啥的，都是可以加的，右击单个组件，选择padding and borders即可设置。

## 4.将pdf转为base64字符串并在前端打印出来 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXFpYW5nOTE1_size_16_color_FFFFFF_t_70 20][]

转base64工具类

package com.wq.jasperReportDemo.util;
    
    import org.apache.tomcat.util.codec.binary.Base64;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    
    /**
     * @program: jasperReportDemo
     * @description:
     * @author: WQ
     * @create: 2020-12-14 15:34
     **/
    public class FileUtil {
    
        /**
         * 文件转为base64字符串。filePath：文件路径
         */
        public static String fileToBase64(String filePath) throws IOException {
            File file = new File(filePath);
            FileInputStream inputFile = new FileInputStream(file);
            byte[] buffer = new byte[(int) file.length()];
            inputFile.read(buffer);
            inputFile.close();
            byte[] bs = Base64.encodeBase64(buffer);
            return new String(bs);
        }
    
    }

## 5.前端接收，并调用打印控件打印出结果 ##

控件有偿，需要私聊。

$.ajax({
                    url: "http://localhost:5777/print",
                    type: "post",
                    data: data,
                    //打开下方注释即双面打印
                    //headers: {
                    //    'Page-Type': 'DUPLEX'
                    //},
                    success: function (data) {
                        layer.close(layer.index);
                        if ("Success" == data) {
                            layer.msg("报表已打印", {offset: "100px"});
                            return true;
                        } else {
                            layer.msg("报表打印失败", {anim: 6, offset: "100px"});
                        }
                        return false;
                    },
                    error: function () {
                        layer.close(layer.index);
                        layer.msg("打印失败。连接打印机失败或控件未下载", {anim: 6, offset: "100px"});
                        return false;
                    }
                })

![20201214154334563.png][]

[iReport]: https://community.jaspersoft.com/project/ireport-designer/releases
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[20201214142217413.png]: https://img-blog.csdnimg.cn/20201214142217413.png
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[20201214152455214.png]: https://img-blog.csdnimg.cn/20201214152455214.png
[Link 1]: https://blog.csdn.net/weiqiang915/article/details/107980777
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[20201214153126189.png]: https://img-blog.csdnimg.cn/20201214153126189.png
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[20201214154334563.png]: https://img-blog.csdnimg.cn/20201214154334563.png