如何使 PDF 文件可在链接中下载？

我正在使用 JSF 构建 Web 应用程序，当用户单击“另存为 PDF”链接时，应该可以下载 PDF。

到目前为止，我有一个生成 PDF 文件的工作代码，但文件保存在我的桌面上，我想做的是当用户单击链接时，pdf 文件应该是可下载的而不是被存储在应用程序中。

更新 3: 谢谢你们的帮助，我根据你们的建议修改了我的代码并且它正在运行。

更新 2: 我收到以下错误:Adoble Reader 无法打开“yourfile.pdf”，因为文件类型不受支持或文件已损坏

更新 1: 我正在将您指出的更改添加到我当前的代码中，但是我仍在努力完成这项工作

This is my method that generated the PDF:

public ByteArrayOutputStream createPDF() throws IOException, COSVisitorException {

    PDDocument document;
    PDPage page;
    PDFont font;
    PDPageContentStream contentStream;
    PDJpeg front;
    PDJpeg back;

    InputStream inputFront;
    InputStream inputBack;
    ByteArrayOutputStream output = new ByteArrayOutputStream(); 

    // Creating Document
    document = new PDDocument();

    // Creating Pages
    for(int i=0; i<2; i++) {

        page = new PDPage();

        // Adding page to document
        document.addPage(page); 

        // Adding FONT to document
        font = PDType1Font.HELVETICA;           

        // Retrieve Image to be added to the PDF
        inputFront = new FileInputStream(new File("D:/Media/imageFront.jpg"));  
        inputBack = new FileInputStream(new File("D:/Media/imageBack.jpg"));

        BufferedImage buffFront = ImageIO.read(inputFront);
        BufferedImage resizedFront = Scalr.resize(buffFront, 460);

        BufferedImage buffBack = ImageIO.read(inputBack);
        BufferedImage resizedBack = Scalr.resize(buffBack, 460); 

        front = new PDJpeg(document, resizedFront);
        back = new PDJpeg(document, resizedBack);

        // Next we start a new content stream which will "hold" the to be created content.
        contentStream = new PDPageContentStream(document, page);                

        // Let's define the content stream
        contentStream.beginText();
        contentStream.setFont(font, 8);
        contentStream.moveTextPositionByAmount(10, 770);
        contentStream.drawString("Amount: $1.00");
        contentStream.endText();

        contentStream.beginText();
        contentStream.setFont(font, 8);
        contentStream.moveTextPositionByAmount(200, 770);
        contentStream.drawString("Sequence Number: 123456789");
        contentStream.endText();

        contentStream.beginText();
        contentStream.setFont(font, 8);
        contentStream.moveTextPositionByAmount(10, 760);
        contentStream.drawString("Account: 123456789");
        contentStream.endText();

        contentStream.beginText();
        contentStream.setFont(font, 8);
        contentStream.moveTextPositionByAmount(200, 760);
        contentStream.drawString("Captura Date: 04/25/2011");
        contentStream.endText();

        contentStream.beginText();
        contentStream.setFont(font, 8);
        contentStream.moveTextPositionByAmount(10, 750);
        contentStream.drawString("Bank Number: 123456789");
        contentStream.endText();

        contentStream.beginText();
        contentStream.setFont(font, 8);
        contentStream.moveTextPositionByAmount(200, 750);
        contentStream.drawString("Check Number: 123456789");
        contentStream.endText();            

        // Let's close the content stream       
        contentStream.close();

    }

    // Finally Let's save the PDF
    document.save(output);
    document.close();

    return output;
}

This is my servlet that call the previous code and generates the output and set the header:

try {

        ByteArrayOutputStream output = new ByteArrayOutputStream();
        output = createPDF();

        response.addHeader("Content-Type", "application/force-download"); 
        response.addHeader("Content-Disposition", "attachment; filename=\"yourFile.pdf\"");
        response.getOutputStream().write(output.toByteArray());

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

我不确定我错过了什么，因为当我尝试打开 PDF 时出现错误:Adoble Reader 无法打开“yourfile.pdf”，因为它不是受支持的文件类型，或者因为该文件已被损坏

最佳答案

您需要设置正确的 http header 以告知浏览器下载文件。

response.addHeader("Content-Type", "application/force-download")
response.addHeader("Content-Disposition", "attachment; filename=\"yourFile.pdf\"")

关于java - 如何使用 pdfbox(损坏的 PDF)生成可下载的 PDF？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8913259/