关于itext操作pdf文档
pdf基本操作
自己点击链接去看下就会了
java使用itext生成pdf
再不行,去看官方文档 itext Api
直接找到com.itextpdf.text.pdf这个包,看它的操作类
现在我就说我在这里碰到了坑
用户要执行下载pdf文件的操作
返回ModelAndView给页面就行了,但是springboot中的pdf模板类AbstractPdfStamperView 只支持
com.lowagie包下的 不支持itext5,所以只能换个方式
自己创建一个模板类
AbstractIText5PdfView
import com.itextpdf.text.Document;import com.itextpdf.text.DocumentException;import com.itextpdf.text.PageSize;import com.itextpdf.text.pdf.PdfWriter;import org.springframework.web.servlet.view.AbstractView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.ByteArrayOutputStream;import java.io.OutputStream;import java.util.Map;/*** 这里就全部复制spring 的，然后引入的东西改成第5版的就行了* 代码 几乎不变，唯一变的是引用路径~。~ 没贴出来了，自己导入就能看见** @author Ran*/public abstract class AbstractIText5PdfView extends AbstractView {public AbstractIText5PdfView() {setContentType("application/pdf");}@Overrideprotected boolean generatesDownloadContent() {return true;}@Overrideprotected final void renderMergedOutputModel(Map<String, Object> model,HttpServletRequest request, HttpServletResponse response)throws Exception {// 获得流ByteArrayOutputStream baos = createTemporaryOutputStream();Document document = newDocument();PdfWriter writer = newWriter(document, baos);prepareWriter(model, writer, request);buildPdfMetadata(model, document, request);/*document.open();*/buildPdfDocument(model, document, writer, request, response);/* document.close();*/writeToResponse(response, baos);}protected Document newDocument() {return new Document(PageSize.A4);}protected PdfWriter newWriter(Document document, OutputStream os)throws DocumentException {return PdfWriter.getInstance(document, os);}protected void prepareWriter(Map<String, Object> model, PdfWriter writer,HttpServletRequest request) throws DocumentException {writer.setViewerPreferences(getViewerPreferences());}protected int getViewerPreferences() {return PdfWriter.ALLOW_PRINTING | PdfWriter.PageLayoutSinglePage;}protected void buildPdfMetadata(Map<String, Object> model,Document document, HttpServletRequest request) {}protected abstract void buildPdfDocument(Map<String, Object> model,Document document, PdfWriter writer, HttpServletRequest request,HttpServletResponse response) throws Exception;}
最后再创建一个操作类，继承AbstractIText5PdfView，重写buildPdfDocument
其中设定文件头部，文件类型就多说了
pdfUtil为文件操作类，操作document writer 元素 model可以向里面传值，生成pdf可以引用
访问顺序为 controller层 return new ModelAndView(new PdfView(), model);>>
PdfView 设定文件头部和类型 >>PdfUtil 操作pdf元素>>最后关闭document writer
（因为不只是创建一个pdf文件，所以增加代码的复用性）
@Controller("PdfView")public class PdfView extends AbstractIText5PdfView {@Overrideprotected void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer, HttpServletRequest request, HttpServletResponse response) throws Exception {String excelName = "download.pdf";response.setContentType("APPLICATION/OCTET-STREAM");response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(excelName, "UTF-8"));PdfUtil pdfUtil = new PdfUtil();pdfUtil.createContactsPDF(document, writer, model);}}
其中要注意一点 因为是自己创建的pdf模板，所以pdf大小默认是A4纸大小，如果要修改：
Rectangle tRectangle = new Rectangle(590, 420);document.setPageSize(tRectangle);
以上是对pdf的增加，如果要对pdf里面的扩展文件如单选框，文本域，请看一下操作
对模板进行操作不需要过多操作document 元素，所以不需要继承pdf模板
其中附件三字段顺序是要自己一个个试出来的
Map<String, AcroFields.Item> fields = acroFields.getFields(); //获取所有页面文本域信息
其中单选框按钮也可修改值 其中值可以是 1 2 || true false
Adobe Acrobat Reader DC 可以修改单选框什么值代表选中
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其中要注意的一点就是兼容性的问题，因为此项目的客户是香港客户，那边查看pdf通常用Adobe 进行查看，所以要注意字体的兼容性，AdobeSongStd-Light.otf字体
像wps我没有看过，所以不知道
@Autowiredprivate ISysSecretarialFjService secretarialFjService;@RequestMapping(value = "/createFJ3Pdf", method = RequestMethod.GET)public Object createFJ3Pdf(HttpServletRequest request, HttpServletResponse response) throws IOException {String dataorgid = JwtUtil.getUserSystemData(DataBaseConstant.SYS_DATAORGID, null);String id = request.getParameter("id");/*获取附件三pdf字段顺序*/String path = SecretaryPDFController.class.getClassLoader().getResource("FJjson/FJ3.json").getPath();String s = ReadUtils.readJsonFile(path);Map<String, List<String>> JSONlist = (Map<String, List<String>>) JSONObject.parse(s);/* 获取附件三pdf内容 */QueryWrapper<SysSecretarialFj> wrapper = new QueryWrapper<>();wrapper.eq("secretarial_id", id);List<SysSecretarialFj> secretarialFjList = secretarialFjService.list(wrapper);OutputStream ouputStream = response.getOutputStream();/*本地模板*/String fileName = SecretaryPDFController.class.getClassLoader().getResource("FJ/FJ3.pdf").getPath();PdfReader reader;PdfStamper stamper;ByteArrayOutputStream bos;try {reader = new PdfReader(fileName);// 读取pdf模板bos = new ByteArrayOutputStream();stamper = new PdfStamper(reader, bos);AcroFields form = stamper.getAcroFields();for (int i = 1; i <= 11; i++) {/* page页面写入 */List<String> page = JSONlist.get("page" + i);SysSecretarialFj secretarialFj = null;for (SysSecretarialFj sec : secretarialFjList) {if (sec.getPageNum().equals("" + i)) {secretarialFj = sec;}}Map<String, String> map = (Map<String, String>) JSONObject.parse(secretarialFj.toString());List<String> dataList = new ArrayList<String>();for (int j = 1; j <= 50; j++) {for (Map.Entry<String, String> entries : map.entrySet()) {if (("c" + j).equals(entries.getKey())) {dataList.add(entries.getValue().equals("null") || entries.getValue() == null ? "" : entries.getValue());}}}String FontUrl = SecretaryPDFController.class.getClassLoader().getResource("PdfResource/AdobeSongStd-Light.otf").getPath();BaseFont baseFont1 = BaseFont.createFont(FontUrl, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); //不加粗form.addSubstitutionFont(baseFont1);//因为字体兼容的问题，所以改变填写的字体for (int j = 0; j < page.size(); j++) {/* form.setFieldProperty(page.get(j), "textfont", baseFont1, null);*/form.setField(page.get(j), dataList.get(j)); //存入顺序一样}}stamper.setFormFlattening(false);//如果为false那么生成的PDF文件还能编辑stamper.close();Document document = new Document();PdfCopy pdfCopy = new PdfCopy(document, ouputStream);document.open();pdfCopy.addDocument(new PdfReader(bos.toByteArray()));response.setHeader("Content-disposition", "formPDF");response.setHeader("Content-type", "application/pdf;charset=utf-8");response.setHeader("Content-disposition", "attachment;filename=formPDF.pdf");response.setHeader("Pragma", "No-cache");document.close();} catch (BadPdfFormatException e) {e.printStackTrace();} catch (DocumentException e) {e.printStackTrace();} finally {if (ouputStream != null) {ouputStream.close();}}Result<String> res = new Result<>();res.setSuccess(true);return res;}
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