【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);