Question

我使用IText库创建了pdf 现在我想要当用户点击按钮时，它应该向用户提示一个保存对话框，以允许浏览目标位置来存储文件。

现在我的代码看起来像

    Document document = new Document();
    try {

                    FacesContext context = FacesContext.getCurrentInstance();
        HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
        response.reset();  
        response.setContentType("application/pdf");

        response.setHeader("Content-Disposition", "attachment; filename=ABC.pdf");
        response.setHeader("Cache-Control", "no-cache");  
        response.setDateHeader("Expires", 0);  
        response.setHeader("Pragma", "No-cache");
        PdfWriter.getInstance(document, response.getOutputStream());

        document.addTitle("Form");
        document.addSubject("Form");

        document.open();

        Paragraph paragraph12 = new Paragraph("FORM",

        FontFactory.getFont(FontFactory.HELVETICA,

        18, Font.BOLD, new CMYKColor(0, 255, 255, 17)));

        Chapter chapter1 = new Chapter(paragraph12, 1);
        paragraph12.setSpacingAfter(25);
        paragraph12.setAlignment(Element.ALIGN_CENTER);
        document.add(paragraph12);
        // Centered

        Chunk underline = new Chunk(AppNo);
        underline.setUnderline(0.2f, -2f);

        Paragraph paragraph = new Paragraph("Application No:");
        paragraph.add(underline);
        paragraph.setAlignment(Element.ALIGN_LEFT);
        paragraph.setSpacingAfter(20);
        document.add(paragraph);
        // Left
        paragraph = new Paragraph("To,");
        paragraph.setAlignment(Element.ALIGN_LEFT);
        document.add(paragraph);
        // Left with indentation
        paragraph = new Paragraph(
                "");
        paragraph.setAlignment(Element.ALIGN_LEFT);
        document.add(paragraph);

        Paragraph paragraph2 = new Paragraph(
                "Subject: ");

        paragraph2.setSpacingAfter(15);
        paragraph2.setSpacingBefore(15);
        paragraph2.setAlignment(Element.ALIGN_LEFT);
        paragraph2.setIndentationRight(50);
        document.add(paragraph2);



        Paragraph paragraph3 = new Paragraph("I  ");
        String laName=deaclarationOpr.getDeclarationDetailsobj()
                .getLaName();
        if(laName!=null){
        Chunk name = new Chunk(laName);
        name.setUnderline(0.2f, -2f);
        paragraph3.add(name);
        }
        paragraph3.add("  request you to process the Application  ");
        paragraph3.add(underline);
        paragraph3.add("  for product  ");


        String productName=deaclarationOpr
                .getDeclarationDetailsobj().getProductName();
        if(productName!=null){
        Chunk product = new Chunk(productName);
        product.setUnderline(0.2f, -2f);
        paragraph3.add(product);
        }
        paragraph3
                .add("");

        paragraph3.setSpacingAfter(15);
        paragraph3.setSpacingBefore(15);
        paragraph3.setAlignment(Element.ALIGN_LEFT);
        paragraph3.setIndentationLeft(50);
        paragraph3.setIndentationRight(50);
        document.add(paragraph3);

        Paragraph paragraph4 = new Paragraph(
                "");





        String code=deaclarationOpr
                .getDeclarationDetailsobj().getAdvisorCode();
        if(code!=null){
        Chunk advisorCode = new Chunk(code);
        advisorCode.setUnderline(0.2f, -2f);
        paragraph4.add(advisorCode);
        }
        paragraph4
                .add("");

        paragraph4.setSpacingAfter(15);
        paragraph4.setSpacingBefore(15);
        paragraph4.setAlignment(Element.ALIGN_LEFT);
        paragraph4.setIndentationLeft(50);
        paragraph4.setIndentationRight(50);
        document.add(paragraph4);

        Paragraph paragraph5 = new Paragraph(
                "");

        paragraph5.setSpacingAfter(15);
        paragraph5.setSpacingBefore(15);
        paragraph5.setAlignment(Element.ALIGN_LEFT);
        paragraph5.setIndentationLeft(50);
        paragraph3.setIndentationRight(50);
        document.add(paragraph5);

        Paragraph paragraph6 = new Paragraph(
                "");

        paragraph6.setSpacingAfter(15);
        paragraph6.setSpacingBefore(15);
        paragraph6.setAlignment(Element.ALIGN_LEFT);
        paragraph6.setIndentationLeft(50);
        paragraph6.setIndentationRight(50);
        document.add(paragraph6);

        Paragraph paragraph7 = new Paragraph("Date:      ");
        DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
        // get current date time with Date()
        Date date = new Date();
        paragraph7.add(dateFormat.format(date));
        paragraph7.setSpacingBefore(15);
        paragraph7.setIndentationLeft(50);
        paragraph7.setIndentationRight(50);
        paragraph7.setAlignment(Element.ALIGN_LEFT);
        document.add(paragraph7);

        Paragraph paragraph8 = new Paragraph("Name of the Proposer:      ");

        String propoer=deaclarationOpr
                .getDeclarationDetailsobj().getProposerName();
        if(propoer!=null){
        Chunk proposerName = new Chunk(propoer);
        proposerName.setUnderline(0.2f, -2f);
        paragraph8.add(proposerName);
        }
        paragraph8.setAlignment(Element.ALIGN_LEFT);
        paragraph8.setIndentationLeft(50);
        paragraph8.setIndentationRight(50);
        document.add(paragraph8);

        Paragraph paragraph9 = new Paragraph("Place:      ");
        paragraph9.setIndentationLeft(50);
        paragraph9.setIndentationRight(50);
        paragraph9.setAlignment(Element.ALIGN_LEFT);
        document.add(paragraph9);


        document.close();

context.responseComplete（）; } catch（FileNotFoundException e）{ // TODO自动生成的catch块 e.printStackTrace（）; } catch（DocumentException e）{ // TODO自动生成的catch块 e.printStackTrace（）; }

以下过滤器在web.xml中定义

<filter>
        <display-name>RichFaces Filter</display-name>
        <filter-name>richfaces</filter-name>
        <filter-class>org.ajax4jsf.Filter</filter-class>
        <init-param>
            <param-name>createTempFiles</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>maxRequestSize</param-name>
            <param-value>20000000</param-value>
        </init-param>
        <init-param>
            <param-name>enable-cache</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>richfaces</filter-name>
        <servlet-name>Faces Servlet</servlet-name>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
    </filter-mapping>

上面的代码是用Backing Bean类

的方法编写的

并调用

<tr>
<td align="center"><a4j:commandButton
value="Print" styleClass="button"
action="#{declarationBB.convertToPdf}"></a4j:commandButton></td>
</tr>

我在新页面中得到了以下内容

%PDF-1.4 %��3 0 obj <>stream x��V����Ժ@��rs�0��m|셒F6[�T���H[��E D'��7��

Answer 1

只需将PDF写入HTTP响应而不是本地文件。

替换

PdfWriter.getInstance(document, new FileOutputStream("D:/Files/ABC.pdf"));

通过

FacesContext context = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "attachment; filename=\"ABC.pdf\"");
PdfWriter.getInstance(document, response.getOutputStream());

// ... (your PDF building code here)

context.responseComplete();

并在与下载按钮关联的操作方法中调用它。值为Content-Disposition的{{1}}标头将强制另存为对话框（除非将浏览器配置为在Adobe Reader中自动打开PDF文件！）。

另见：

How to provide a file download from a JSF backing bean?

更新：根据您的更新，您正在通过ajax调用下载。

attachment

这不起作用。您无法通过ajax下载文件。 Ajax是由JavaScript执行的，但由于明显的安全原因，没有任何工具可以以某种变量以编程方式强制另存为对话与异步获取/生成的内容。请改为正常请求。请改用<a4j:commandButton value="Print" styleClass="button" action="#{declarationBB.convertToPdf}"></a4j:commandButton>。

在jsf中保存对话框

1 个答案:

另见：