Cara menjalankan Aspose.PDF for .NET 8 di Docker

Prasyarat

Contoh berikut diuji dengan:

• Docker v.25.0.2 dan Docker Desktop 4.27.1.
• Visual Studio 2022 Community Edition v.17.0.5.
• .NET 8 SDK digunakan dalam contoh yang diberikan di bawah.
• Aspose.PDF.Drawing v.24.01.

Buat aplikasi contoh untuk Kontainer Docker Linux

1. Luncurkan Visual Studio 2022 dan pilih template ASP.NET Core Web App (Model-View-Controller) dan tekan Next.
2. Di jendela Konfigurasi proyek baru Anda, atur nama proyek dan lokasi yang diinginkan dan tekan Next.
3. Di jendela Informasi tambahan, pilih .NET 6.0 (Dukungan jangka panjang) dan aktifkan dukungan Docker. Anda juga dapat mengatur Docker OS ke Linux jika diperlukan.
4. Tekan Create.
5. Pilih Tools->Nuget Package Manager->Package Manager Console dan instal Aspose.PDF for .NET (gunakan perintah Install-Package Aspose.PDF).

Hasilkan dokumen PDF menggunakan Aplikasi Web ASP.NET Core di kontainer Linux

Kami akan menggunakan kode dari Contoh Kompleks dalam aplikasi ini. Silakan ikuti tautan ini untuk penjelasan yang lebih rinci.

1. Buat folder images di folder wwwroot dan letakkan gambar logo.png. Anda dapat mengunduh gambar ini dari sini.
2. Buat folder fonts di folder wwwroot dan letakkan font Roboto di sana.
3. Buat folder samples di folder wwwroot dan letakkan data contoh di sana.
4. Ganti kode di HomeController.cs dengan cuplikan berikut (harap dicatat bahwa Anda dapat memiliki namespace lain):

using Aspose.Pdf;
using Aspose.Pdf.Devices;
using Aspose.Pdf.Text;
using Docker.LinuxDemo.Models;
using Microsoft.AspNetCore.Mvc;
using System.Diagnostics;

namespace Docker.LinuxDemo.Controllers
{
    // <summary>
    // Represents a controller for the home page and PDF generation in a Linux demo application.
    // </summary>
    public class HomeController(ILogger<HomeController> logger, IWebHostEnvironment appEnvironment) : Controller
    {
        private readonly ILogger<HomeController> _logger = logger;
        private readonly IWebHostEnvironment _appEnvironment = appEnvironment;

        // <summary>
        // Displays the index view.
        // </summary>
        public IActionResult Index()
        {
            return View();
        }

        // <summary>
        // Generates a PDF document and returns it as a file.
        // </summary>
        public IActionResult Generate()
        {
            const string fileType = "application/pdf";
            const string fileName = "sample.pdf";
            FontRepository.Sources.Add(new FolderFontSource(Path.Combine(_appEnvironment.WebRootPath, "fonts")));
            var memoryStream = new MemoryStream();

            _logger.LogInformation("PDF Generation: Start ");
            // Create PDF document
            using (var document = new Aspose.Pdf.Document())
            {
                // Add page
                var page = document.Pages.Add();

                // Add image
                var imageFileName = Path.Combine(_appEnvironment.WebRootPath, "images", "logo.png");
                page.AddImage(imageFileName, new Rectangle(20, 730, 120, 830));

                // Add Header
                var header = new TextFragment("New ferry routes in Fall 2020");
                header.TextState.Font = FontRepository.FindFont("Roboto");
                header.TextState.FontSize = 24;
                header.HorizontalAlignment = HorizontalAlignment.Center;
                header.Position = new Position(130, 720);
                page.Paragraphs.Add(header);

                // Add description
                var descriptionText = "Visitors must buy tickets online and tickets are limited to 5,000 per day. Ferry service is operating at half capacity and on a reduced schedule. Expect lineups.";
                var description = new TextFragment(descriptionText);
                description.TextState.Font = FontRepository.FindFont("Helvetica");
                description.TextState.FontSize = 14;
                description.HorizontalAlignment = HorizontalAlignment.Left;
                page.Paragraphs.Add(description);

                // Add table
                var table = new Table
                {
                    ColumnWidths = "200",
                    Border = new BorderInfo(BorderSide.Box, 1f, Color.Black),
                    DefaultCellBorder = new BorderInfo(BorderSide.Box, 0.5f, Color.Gray),
                    DefaultCellPadding = new MarginInfo(4.5, 4.5, 4.5, 4.5),
                    Margin =
                    {
                        Top = 10,
                        Bottom = 10
                    },
                    DefaultCellTextState =
                    {
                        Font =  FontRepository.FindFont("Helvetica")
                    }
                };

                var headerRow = table.Rows.Add();
                headerRow.Cells.Add("Departs City");
                headerRow.Cells.Add("Departs Island");
                foreach (Cell headerRowCell in headerRow.Cells)
                {
                    headerRowCell.BackgroundColor = Color.LightGray;
                    headerRowCell.DefaultCellTextState.ForegroundColor = Color.FromRgb(0.1, 0.1, 0.1);
                }

                var time = new TimeSpan(6, 0, 0);
                var incTime = new TimeSpan(0, 30, 0);
                for (int i = 0; i < 10; i++)
                {
                    var dataRow = table.Rows.Add();
                    dataRow.Cells.Add(time.ToString(@"hh\:mm"));
                    time = time.Add(incTime);
                    dataRow.Cells.Add(time.ToString(@"hh\:mm"));
                }

                page.Paragraphs.Add(table);

                document.Save(memoryStream);
            }
            _logger.LogInformation("PDF Generation: Finish");
            return File(memoryStream, fileType, fileName);
        }

        // <summary>
        // Converts a file to a different format based on the provided id.
        // </summary>
        public FileStreamResult Convert(string id)
        {
            return id switch
            {
                "xps-to-pdf" => ConvertXpsToPdf(),
                "pdf-to-jpeg" => ConvertPdfToJpeg(),
                _ => throw new NotImplementedException(),
            };
        }

        // <summary>
        // Converts a PDF file to JPEG format and returns it as a file.
        // </summary>
        private FileStreamResult ConvertPdfToJpeg()
        {
            const string fileType = "image/jpeg";
            const string fileName = "sample.jpeg";

            var memoryStream = new MemoryStream();
            var pdfFileName = Path.Combine(_appEnvironment.WebRootPath, "samples", "samples-new.pdf");

            // Open PDF document
            using (var document = new Aspose.Pdf.Document(pdfFileName))
            {
                var resolution = new Resolution(300);
                var renderer = new JpegDevice(resolution, 90);
                renderer.Process(document.Pages[1], memoryStream);
                memoryStream.Seek(0, SeekOrigin.Begin);
                return File(memoryStream, fileType, fileName);
            }
        }

        // <summary>
        // Converts an XPS file to PDF format and returns it as a file.
        // </summary>
        private FileStreamResult ConvertXpsToPdf()
        {
            const string fileType = "application/pdf";
            const string fileName = "sample.pdf";

            var memoryStream = new MemoryStream();
            var xpsFileName = Path.Combine(_appEnvironment.WebRootPath, "samples", "samples-new.oxps");

            // Open XPS document
            using (var document = new Aspose.Pdf.Document(xpsFileName, new Aspose.Pdf.XpsLoadOptions()))
            {
                document.Save(memoryStream);
            }

            return File(memoryStream, fileType, fileName);
        }

        // <summary>
        // Displays the privacy view.
        // </summary>
        public IActionResult Privacy()
        {
            return View();
        }

        // <summary>
        // Displays the error view.
        // </summary>
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

1. Ganti konten di Dockerfile dengan konten berikut:

FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base

RUN apt-get update && apt-get install -y libgdiplus
RUN apt install software-properties-common -y
RUN echo "deb http://deb.debian.org/debian bookworm contrib non-free" > /etc/apt/sources.list.d/contrib.list
RUN apt update && apt upgrade
RUN apt install ttf-mscorefonts-installer -y


USER app
WORKDIR /app
EXPOSE 8080
EXPOSE 8081

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
ARG BUILD_CONFIGURATION=Release
WORKDIR /src
COPY ["Docker.Demo/Docker.LinuxDemo.csproj", "Docker.Demo/"]
RUN dotnet restore "./Docker.Demo/./Docker.LinuxDemo.csproj"
COPY . .
WORKDIR "/src/Docker.Demo"
RUN dotnet build "./Docker.LinuxDemo.csproj" -c $BUILD_CONFIGURATION -o /app/build

FROM build AS publish
ARG BUILD_CONFIGURATION=Release
RUN dotnet publish "./Docker.LinuxDemo.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Docker.LinuxDemo.dll"]