Implementing Document Signing and Stamping with SpringBoot and PageOffice

1. Introduction

Digital signatures use cryptographic techniques to verify identity, ensure authenticity, integrity, and non‑repudiation of electronic documents. The article introduces an open‑source system that simulates a file signing and stamping workflow in an OA environment, leveraging PageOffice for online Word/PDF processing and RSA‑based signatures compliant with Chinese e‑signature law.

2. Project Source Code and Deployment

2.1 Project Structure and Framework

The system is built with SpringBoot and Thymeleaf, packaged via Maven.

Controller Layer

@Controller
@RequestMapping("/mobile")
public class MobileOfficeController {
@Value("${docpath}")
private String docPath;
@Value("${moblicpath}")
private String moblicpath;
@Autowired
DocService m_docService;
@RequestMapping("/opendoc")
public void opendoc(HttpServletRequest request, HttpServletResponse response, HttpSession session, String type, String userName) throws Exception {
// ... omitted for brevity ...
}
@RequestMapping("/savedoc")
public void savedoc(HttpServletRequest request, HttpServletResponse response) {
FileSaver fs = new FileSaver(request, response);
fs.saveToFile(docPath + fs.getFileName());
fs.close();
}
}

Business Service Layer

@Service
public class DocServiceImpl implements DocService {
@Autowired
DocMapper docMapper;
@Override
public Doc getDocById(int id) throws Exception {
Doc doc = docMapper.getDocById(id);
if (doc == null) { doc = new Doc(); }
return doc;
}
// addDoc, updateStatusForDocById, updateDocNameForDocById, updatePdfNameForDocById ...
}

File Copy Utility

public class CopyFileUtil {
public static boolean copyFile(String oldPath, String newPath) throws Exception {
// ... file copy logic ...
}
}

QR Code Utility

public class QRCodeUtil {
private String codeText;
private BarcodeFormat barcodeFormat;
private int width;
private int height;
private String imageformat;
private int backColorRGB;
private int codeColorRGB;
private ErrorCorrectionLevel errorCorrectionLevel;
private String encodeType;
// constructors, getters, setters, toBufferedImage, writeToBytes, getQRCodeBytes ...
}

2.2 Project Download and Setup

Source code download: https://download.csdn.net/download/weixin_44385486/86427996

Import the slndemo project into IDEA and run.

Copy slndemodata.zip to the D: drive root and unzip.

Start the project.

3. Feature Demonstration

3.1 Login to Home Page

URL: http://localhost:8888/pc/login

Account: 张三 / Password: 123456

3.2 System Home Page Overview

The demo showcases Word document flow: drafting, approval, review, stamping, and final publishing. PageOffice provides over a hundred functions such as open, edit, save, dynamic fill, merge, stamping, etc. The demo creates only one document for simplicity.

3.3 Draft Document

Click “Draft Document” and submit.

3.4 Edit and Save

After installing PageOffice plugin, edit the document, then click “Save”.

3.5 Approval Workflow

Various users (李总, 赵六, 王五) log in to approve, review, and finally stamp the document. The process includes password‑protected stamping and signature.

3.6 Final Signed and Stamped Document

After saving, the completed document is displayed.

4. Conclusion

The demo provides a practical reference for integrating digital signatures and electronic stamping into Java web applications using SpringBoot and PageOffice, and can be adapted to other OA or document‑centric systems.