Primefaces 从 iText 生成的 PDF 在对象组件中显示为空白

Question

我需要你的助手在 object 中显示 PDF 文档的内容 component.Currently PDF 显示为空白。

bean代码为：

    public void  CreatePDF() throws IOException {
      try{
        Document doc = new Document(PageSize.A4, 50, 50, 50, 50);
        OutputStream out = new ByteArrayOutputStream();
        PdfWriter writer = PdfWriter.getInstance(doc, out);
        doc.open();

        PdfPTable table = new PdfPTable(1);
        PdfPCell cell = new PdfPCell(new Phrase("First PDF"));
        cell.setBorder(Rectangle.NO_BORDER);
        cell.setRunDirection(PdfWriter.RUN_DIRECTION_LTR);
        table.addCell(cell);
        doc.add(table);
        doc.close();
        out.close();

        InputStream in =new ByteArrayInputStream(((ByteArrayOutputStream)out).toByteArray());

                    streamedContent = new DefaultStreamedContent(in, "application/pdf");

                Map<String, Object> session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
                byte[] b = (byte[]) session.get("reportBytes");
                if (b != null) {
                    streamedContent = new DefaultStreamedContent(new ByteArrayInputStream(b), "application/pdf");
                }         
      }
        catch (Exception e) {
          e.printStackTrace();
                }
    }

和jsf代码：

<p:commandButton value="Show PDF"  actionListener="#{pdf.CreatePDF}"  icon="ui-icon-disk" update=":request:testpdf" />

<p:media id="testpdf" value="#{pdf.streamedContent}" width="190" height="250" player="pdf"/>

现在我得到以下错误：

]] Root cause of ServletException. java.lang.NoClassDefFoundError: javax/el/ValueReference at org.primefaces.el.InterceptingResolver.getValue(InterceptingResolver.java:51) at com.sun.el.parser.AstIdentifier.getValue(Unknown Source) at com.sun.el.parser.AstValue.getValue(Unknown Source) at com.sun.el.ValueExpressionImpl.getValue(Unknown Source) at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) at org.primefaces.el.ValueExpressionAnalyzer.intercept(ValueExpressionAnalyzer.java:69) at org.primefaces.el.ValueExpressionAnalyzer.getExpression(ValueExpressionAnalyzer.java:45) at org.primefaces.util.DynamicResourceBuilder.build(DynamicResourceBuilder.java:49) at org.primefaces.component.media.MediaRenderer.getMediaSrc(MediaRenderer.java:125) at org.primefaces.component.media.MediaRenderer.encodeEnd(MediaRenderer.java:42) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:884)

Answer 1

iText WAR 文件保存在 /lib 文件夹下并且运行良好。兼容版本为iText 2.1.7 请参考文档中的Dependencies

Primefaces 从 iText 生成的 PDF 在对象组件中显示为空白

Primefaces generated PDF from iText is showing blank in object component

java

jsf

pdf

primefaces

outputstream