spring boot itextPdf根据模板生成pdf文件-白红宇

spring boot itextPdf根据模板生成pdf文件

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发布时间：2019-06-18

本文共 7766 字，大约阅读时间需要 25 分钟。

在开发一些平台中会遇到将数据库中的数据渲染到PDF模板文件中的场景，用itextPdf完全动态生成PDF文件的太过复杂，通过itextPdf/AcroFields可以比较简单的完成PDF数据渲染工作（PDF模板的表单域数据需定义名称）

Controller获取HttpServletResponse 输出流

package pdf.controller;import com.itextpdf.text.DocumentException;import service.PdfService;import io.swagger.annotations.Api;import io.swagger.annotations.ApiOperation;import java.io.IOException;import java.io.OutputStream;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.BeanUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Controller;import org.springframework.validation.annotation.Validated;import org.springframework.web.bind.annotation.*;@Controller@RequestMapping(WebConstants.WEB_pdf + "/download")@Api(description = "pdf下载相关", tags = "Pdf.download")@NoAuthpublic class PdfDownloadController {    @Autowired    private PdfService PdfService;        @Value("${pdf.template.path}")    private String templatePath ;    @ApiOperation(value = "申请表下载")    @RequestMapping(value = "/download/{id}", method = RequestMethod.GET)    @ResponseBody     @NoLogin    public void download(@PathVariable("id") Long id, HttpServletResponse response) throws IOException, DocumentException {                //设置响应contenType        response.setContentType("application/pdf");        //设置响应文件名称        String fileName = new String("申请表.pdf".getBytes("UTF-8"),"iso-8859-1");        //设置文件名称        response.setHeader("Content-Disposition", "attachment; filename="+fileName);        //获取输出流        OutputStream out = response.getOutputStream();         PdfService.download(id, templatePath ,out);    }}

Service生成pdf数据响应输出流

1.业务service-负责实现获取pfd模板数据，数据库数据，实现动态赋值生成PDFpackage service.impl;import org.apache.commons.io.IOUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.util.ResourceUtils;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.OutputStream;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Optional;import com.itextpdf.text.DocumentException;import com.itextpdf.text.pdf.AcroFields;import com.itextpdf.text.pdf.BaseFont;import com.itextpdf.text.pdf.PdfReader;import com.itextpdf.text.pdf.PdfStamper;@Servicepublic class ApplyServiceImpl implements ApplyService {    @Override    public DetailDTO getDetail(Long id) {       // 获取业务数据       return null;    }        @Override    public Map
    
      getPdfMapping(DetailDTO dto) {        // TODO Auto-generated method stub        // 获取pdf与数据库的数据字段映射map    }        @Override    public void download(Long id, String templatePath, OutputStream out) {        // TODO Auto-generated method stub        DetailDTO dto  =  getDetail(id);        Map
     
       fieldMapping = getPdfMapping(dto);        String filePath;        byte[] pdfTemplate;        ByteArrayOutputStream pdfOutputStream = new ByteArrayOutputStream();        try {            //获取模板文件路径            filePath = ResourceUtils.getURL(templatePath).getPath();            //获取模板文件字节数据            pdfTemplate = IOUtils.toByteArray(new FileInputStream(filePath));            //获取渲染数据后pdf字节数组数据            byte[] pdfByteArray = generatePdfByTemplate(pdfTemplate, fieldMapping);            pdfOutputStream.write(pdfByteArray);            pdfOutputStream.writeTo(out);            pdfOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                pdfOutputStream.close();                out.flush();                  out.close();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }          }    }    @Override    //itextPdf/AcroFields完成PDF数据渲染    public byte[] generatePdfByTemplate(byte[] pdfTemplate, Map
      
        pdfParamMapping) {        Assert.notNull(pdfTemplate, "template is null");        if (pdfParamMapping == null || pdfParamMapping.isEmpty()) {            throw new IllegalArgumentException("pdfParamMapping can't be empty");        }        PdfReader pdfReader = null;        ByteArrayOutputStream baos = new ByteArrayOutputStream();        PdfStamper stamper = null;        try {            // 读取pdf模板            pdfReader = new PdfReader(pdfTemplate);            stamper = new PdfStamper(pdfReader, baos);            //获取所有表单字段数据            AcroFields form = stamper.getAcroFields();            form.setGenerateAppearances(true);            // 设置            ArrayList
        fontList = new ArrayList<>();            fontList.add(getMsyhBaseFont());            form.setSubstitutionFonts(fontList);            // 填充form            for (String formKey : form.getFields().keySet()) {                form.setField(formKey, pdfParamMapping.getOrDefault(formKey, StringUtils.EMPTY));            }            // 如果为false那么生成的PDF文件还能编辑，一定要设为true            stamper.setFormFlattening(true);            stamper.close();            return baos.toByteArray();        } catch (DocumentException | IOException e) {            LOGGER.error(e.getMessage(), e);        } finally {            if (stamper != null) {                try {                    stamper.close();                } catch (DocumentException | IOException e) {                    LOGGER.error(e.getMessage(), e);                }            }            if (pdfReader != null) {                pdfReader.close();            }        }        throw new SystemException("pdf generate failed");    }    /**     * 默认字体     *     * @return     */    private BaseFont getDefaultBaseFont() throws IOException, DocumentException {        return BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);    }    /**     * 微软宋体字体     *     * @return     */     //设定字体    private BaseFont getMsyhBaseFont() throws IOException, DocumentException {        try {            return BaseFont.createFont("/msyh.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);        } catch (DocumentException | IOException e) {            LOGGER.error(e.getMessage(), e);        }        return getDefaultBaseFont();    }}

数据库的数据到pdf字段的映射可以使用配置，建立数据字段映射表，通过反射
可以将数据库数据对象转为map，再通过定义的静态map映射表，将数据map转
换为pdf表单数据map

BeanUtils.bean2Map(bean);    /**     * JavaBean对象转化成Map对象     * @param javaBean     * @return     */    public static Map bean2Map(Object javaBean) {        Map map = new HashMap();        try {            // 获取javaBean属性            BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass());            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();            if (propertyDescriptors != null && propertyDescriptors.length > 0) {                String propertyName = null; // javaBean属性名                Object propertyValue = null; // javaBean属性值                for (PropertyDescriptor pd : propertyDescriptors) {                    propertyName = pd.getName();                    if (!propertyName.equals("class")) {                        Method readMethod = pd.getReadMethod();                        propertyValue = readMethod.invoke(javaBean, new Object[0]);                        map.put(propertyName, propertyValue);                    }                }            }        } catch (Exception e) {            e.printStackTrace();        }        return map;    }        字段映射配置    public class PdfMapping {        public final static Map
    
      BASE_INFO_MAPPING = new HashMap() {           {            put("name", "partyA");            put("identity", "baseIdentity");           }        };    }

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