【Java】itext根据模板生成pdf（包括图片和表格）

1、导入需要的jar包：itext-asian-5.2.0.jar itextpdf-5.5.11.jar。

2、新建word文档，创建模板，将文件另存为pdf，并用Adobe Acrobat DC打开编辑，点击右侧【准备表单】后点击【开始】

3、在需要插入数据的空白处，右击，点击【文本域】，将文本域拖放到你想要的位置，更改域名称为你传入的变量名。

4、保存文件，将文件放到项目中。生成pdf代码如下：

 public static void creatPdf(Map<String, Object> map,String filePath) {
         try {
             BaseFont bf = BaseFont.createFont("c://windows//fonts//simsun.ttc,1", BaseFont.IDENTITY_H,
                     BaseFont.EMBEDDED);
             FileOutputStream out = new FileOutputStream(filePath);// 输出流
             PdfReader reader = new PdfReader(TemplateToWord.class.getResource("/com/cn/business/templates/report.pdf"));// 读取pdf模板
             ByteArrayOutputStream bos = new ByteArrayOutputStream();
             PdfStamper stamper = new PdfStamper(reader, bos);
             stamper.setFormFlattening(true);
             AcroFields form = stamper.getAcroFields();
             // 文字类的内容处理
             Map<String, String> datemap = (Map<String, String>) map.get("datemap");
             form.addSubstitutionFont(bf);
             for (String key : datemap.keySet()) {
                 String value = datemap.get(key);
                 form.setField(key, value);
             }
             // 图片类的内容处理
             Map<String, String> imgmap = (Map<String, String>) map.get("imgmap");
             for (String key : imgmap.keySet()) {
                 String value = imgmap.get(key);
                 String imgpath = value;
                 int pageNo = form.getFieldPositions(key).get(0).page;
                 Rectangle signRect = form.getFieldPositions(key).get(0).position;
                 float x = signRect.getLeft();
                 float y = signRect.getBottom();
                 // 根据路径读取图片
                 Image image = Image.getInstance(imgpath);
                 // 获取图片页面
                 PdfContentByte under = stamper.getOverContent(pageNo);
                 // 图片大小自适应
                 image.scaleToFit(signRect.getWidth(), signRect.getHeight());
                 // 添加图片
                 image.setAbsolutePosition(x, y);
                 under.addImage(image);
             }
             // 表格类
             Map<String, List<List<String>>> listMap =  (Map<String, List<List<String>>>) map.get("list");
             for (String key : listMap.keySet()) {
                 List<List<String>> lists = listMap.get(key);
                 int pageNo = form.getFieldPositions(key).get(0).page;
                 PdfContentByte pcb = stamper.getOverContent(pageNo);
                 Rectangle signRect = form.getFieldPositions(key).get(0).position;
                 //表格位置
                 int column = lists.get(0).size();
                 int row = lists.size();
                 PdfPTable table =  new PdfPTable(column);
                 float tatalWidth = signRect.getRight() - signRect.getLeft() - 1;
                 int size = lists.get(0).size();
                 float width[] = new float[size];
                 for(int i=0;i<size;i++){
                     if(i==0){
                         width[i]=60f;
                     }else{
                         width[i]=(tatalWidth-60)/(size-1);
                     }
                 }
                 table.setTotalWidth(width);
                 table.setLockedWidth(true);
                 table.setKeepTogether(true);
                 table.setSplitLate(false);
                 table.setSplitRows(true);
                 Font FontProve = new Font(bf, 10, 0);
                 //表格数据填写
                 for(int i=0;i<row;i++){
                     List<String> list = lists.get(i);
                     for(int j=0;j<column;j++){
                         Paragraph paragraph = new Paragraph(String.valueOf(list.get(j)), FontProve);
                         PdfPCell cell = new PdfPCell(paragraph);
                         cell.setBorderWidth(1);
                         cell.setVerticalAlignment(Element.ALIGN_CENTER);
                         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
                         cell.setLeading(0, (float) 1.4);
                         table.addCell(cell);
                     }
                 }
                 table.writeSelectedRows(0, -1, signRect.getLeft(), signRect.getTop(), pcb);
             }
             stamper.setFormFlattening(true);// 如果为false，生成的PDF文件可以编辑，如果为true，生成的PDF文件不可以编辑
             stamper.close();
             Document doc = new Document();
             PdfCopy copy = new PdfCopy(doc, out);
             doc.open();
             int pageNum = reader.getNumberOfPages();
              for(int i = 1;i <= pageNum;i++){
                  PdfImportedPage importPage = copy.getImportedPage(new PdfReader(bos.toByteArray()), i);
                  copy.addPage(importPage);
              }
             doc.close();
         } catch (IOException e) {
             System.out.println(e);
         } catch (DocumentException e) {
             System.out.println(e);
         }

     }

参数：

 //文字类
 Map<String, String> dataMap = new HashMap<String, String>();
 dataMap.put("title", title+time);

 //图片
 String knowImgPath = "D:\\upload\\report\\knowImg.png";
 Map<String, String> imgMap = new HashMap<String, String>();
 imgMap.put("knowImg", knowImgPath);

 //表格 一行数据是一个list
 List<String> list = new ArrayList<String>();
 list.add("日期");
 list.add("金额");

 List<String> list2 = new ArrayList<String>();
 list2.add("2018-01-01");
 list2.add("100");

 List<List<String>> List = new ArrayList<List<String>>();
 List.add(list);
 List.add(list2);

 Map<String, List<List<String>>> listMap = new HashMap<String, List<List<String>>>();
 listMap.put("eventList", List);

 Map<String, Object> o = new HashMap<String, Object>();
 o.put("datemap", dataMap);
 o.put("imgmap", imgMap);
 o.put("list", listMap);

 String knowImgPath = "D:\\upload\\report\\report.pdf";
 creatPdf(o,filePath);