Java操作PDF文件实现签订电子合同详细教程

public class PdfTest {

    public static void main(String[] args) {
        String fileName = "电子合同";
        // 获取当前时间
        Date currentDate = new Date();
        // 创建一个SimpleDateFormat对象，指定日期格式
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
        // 格式化当前时间
        String formattedDate = sdf.format(currentDate);
        //获取当前日期一年后的日期
        String formattedDate2 = sdf.format(new Date(currentDate.getTime() + 365L * 24 * 60 * 60 * 1000));
        System.err.println(formattedDate+"-"+formattedDate2);
        //测试执行
        FillTemplate(
                "刚刚添加表单保存的pdf文件的路径",
                "保存生成的pdf文件的路径",
                "XXX有限公司",
                "张三丰",
                "浙江宁波海曙区红星大厦1706号",
                "李四",
                "18888888888",
                "dawdawd@163.com",
                formattedDate+"至"+formattedDate2,
                formattedDate,
                "签名图片的路径",
                "盖章的路径"
        );
    }
// 下面的参数就是表单中的名称，需要对应上不然找不到（需要注意大小写）
    public static void FillTemplate(
            String sourcesPath,
            String targetPath,
            String name,
            String fr,
            String address,
            String phoneName,
            String phone,
            String wx,
            String data,
            String newData,
            String signPath,
            String gongzhangPath
    ){

        //设置参数
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("name",name);
        jsonObject.put("fr",fr);
        jsonObject.put("address",address);
        jsonObject.put("phoneName",phoneName);
        jsonObject.put("phone",phone);
        jsonObject.put("wx",wx);
        jsonObject.put("data",data);
        jsonObject.put("newData",newData);
        // 填充创建pdf
        PdfReader reader = null;
        PdfStamper stamp = null;
        ByteArrayOutputStream baos =null;
        try {
            reader = new PdfReader( sourcesPath);
            File deskFile = new File(targetPath);
            stamp = new PdfStamper(reader, new FileOutputStream(deskFile));
            // 取出报表模板中的所有字段
            AcroFields form = stamp.getAcroFields();
            System.err.println(form.getFields().keySet());


            //设置宋体
            BaseFont song =BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            if (jsonObject != null) {
                for (Map.Entry<String, Object> entry : jsonObject.entrySet()) {
                    String key = entry.getKey();
                    String value = entry.getValue().toString();
                    //保存选项
                    if (key.startsWith("select")) {
                        form.setField(key, value, true);
                        //保存文字
                    }else {
                        form.setFieldProperty(key, "textfont", song, null);
                        form.setField(key, value);
                    }
                }
            }

            //插入签名
            insertImage(form,stamp,"sign",signPath);
            //插入公章
            insertImage(form,stamp,"gongzhang",gongzhangPath);
            //保存修改
            stamp.setFormFlattening(true);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (stamp != null) {
                try{
                    stamp.close();
                }catch (Exception e){
                    e.printStackTrace();
                }

            }
            if (reader != null) {
                try{
                    reader.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if (baos != null) {
                try{
                    baos.close();
                }catch (Exception e){
                    e.printStackTrace();
                }

            }
        }

    }

    /**
     * pdf模板插入图片
     * @param form
     * @param stamper
     * @param filedName
     * @param url
     * @return
     */
    public  static boolean insertImage(AcroFields form, PdfStamper stamper, String filedName, String url) {
        try {
            int pageNo = form.getFieldPositions(filedName).get(0).page;
            Rectangle signRect = form.getFieldPositions(filedName).get(0).position;
            float x = signRect.getLeft();
            float y = signRect.getBottom();

            Image image = Image.getInstance(url);
            // 获取操作的页面
            PdfContentByte under = stamper.getOverContent(pageNo);
            // 根据域的大小缩放图片
            image.scaleToFit(signRect.getWidth(), signRect.getHeight());
            // 添加图片
            image.setAbsolutePosition(x, y);
            under.addImage(image);
        }catch (Exception e){
            return false;
        }
        return true;
    }
}