使用 Java SDK 将 PNG 转换为 PDF

    package com.aspose.asposecloudpdfusecases.conversions;

    import java.io.File;
    import java.nio.file.Path;
    import java.nio.file.StandardCopyOption;
    import java.util.ArrayList;
    import com.aspose.asposecloudpdf.api.PdfApi;
    import com.aspose.asposecloudpdf.model.AsposeResponse;
    import com.aspose.asposecloudpdf.model.ImageSrcType;
    import com.aspose.asposecloudpdf.model.ImageTemplate;
    import com.aspose.asposecloudpdf.model.ImageTemplatesRequest;

    public class ConvertPngToPdf {
        public static void Convert() {
            String REMOTE_FOLDER   = "Your_Temp_Pdf_Cloud";
            String LOCAL_FOLDER    = "c:\\Samples";
            String PDF_OUTPUT      = "convert_png_pdf_output.pdf";
            String PNG_FILE_NAME  = "sample.png";
        
            try {
                PdfApi pdfApi = new PdfApi(API_KEY, API_SECRET);

                // upload local PDF file to remote storage
                File file = new File(Path.of(LOCAL_FOLDER, PNG_FILE_NAME).toString());
                pdfApi.uploadFile(Path.of(REMOTE_FOLDER , PNG_FILE_NAME).toString(), file, null);
                System.out.println(String.format("Files %s ssuccessfully uploaded!", PNG_FILE_NAME));

                ImageTemplatesRequest imageTemplatesRequest = new ImageTemplatesRequest()
                    .isOCR(false)
                    .imagesList(new ArrayList<ImageTemplate>(){{
                        add(new ImageTemplate().imagePath(Path.of(REMOTE_FOLDER , PNG_FILE_NAME).toString()).imageSrcType(ImageSrcType.COMMON));
                    }});

                AsposeResponse response = pdfApi.putImageInStorageToPdf(PDF_OUTPUT, imageTemplatesRequest, REMOTE_FOLDER, null);

                if (response.getCode() != 200)
                    System.err.println("Error: unexpected error when converting image to PDF! '" + response.getStatus() + "'");
                else{
                    // download changed PDF file from remote folder...
                    File f = pdfApi.downloadFile(Path.of(REMOTE_FOLDER , PDF_OUTPUT).toString(), null, null);
                    java.nio.file.Files.copy(Path.of(f.getPath()), Path.of(LOCAL_FOLDER, PDF_OUTPUT), StandardCopyOption.REPLACE_EXISTING);
                    System.out.println(String.format("File '%s' successfully dowloaded!", Path.of(LOCAL_FOLDER, PDF_OUTPUT).toString()));
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }