1

我想用生成pdf数据导出器，使用方法预处理器插入一些内容。通过给类型字母大小页面同化以及文本格式。然后进行分页，将图表放到一个新的页面上，就出现了生成其他大小的第二页的问题，还想办法改变导出表格文本的字体大小。

<h:commandLink>  
      <p:graphicImage value="/images/pdf.png"/> 
             <p:dataExporter type="pdf" target="dataTableAddDetalles" fileName="pdf" preProcessor="#{serviciosMB.preProcessPDF}"/>  
</h:commandLink>

后备豆

 public void preProcessPDF(Object document) throws Exception {
    try {
        Document pdf = (Document) document;
        pdf.open();
        pdf.setPageSize(PageSize.LETTER);

        ServletContext servletContext = (ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext();
        String logo = servletContext.getRealPath("") + File.separator + "images" + File.separator + "header.gif";

       // pdf.add(Image.getInstance(logo));
        pdf.add(new Paragraph("EMNI", FontFactory.getFont(FontFactory.HELVETICA, 22, Font.BOLD, new Color(0, 0, 0))));
        SimpleDateFormat formato = new SimpleDateFormat("dd/MM/yyyy");

        pdf.add(new Phrase("Fecha: " + formato.format(new Date())));
        pdf.newPage();
    } catch (Exception e) {
        //JsfUtil.addErrorMessage(e, e.getMessage());
    }
}
4

2 回答 2

6

您无法使用 dataexporter 做您想做的事，您需要将代码更改为： 

<h:commandLink actionListener="#{serviciosMB.createPDF}">
    <p:graphicImage value="/images/pdf.png" />
</h:commandLink>

还有你的托管bean： 

public void createPDF() {
    try { //catch better your exceptions, this is just an example
        FacesContext context = FacesContext.getCurrentInstance();
        Document document = new Document();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PdfWriter.getInstance(document, baos);

        if (!document.isOpen()) {
            document.open();
        }

        PdfPTable pdfTable = exportPDFTable();
        document.add(pdfTable);

        //Keep modifying your pdf file (add pages and more)

        document.close();
        String fileName = "PDFFile";

        writePDFToResponse(context.getExternalContext(), baos, fileName);

        context.responseComplete();

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

导出PDFTable方法： 

private PdfPTable exportPDFTable() {
    int numberOfColumns = 1;
    itemOfList item = null;
    PdfPTable pdfTable = new PdfPTable(numberOfColumns);
    pdfTable.setWidthPercentage(100);
    BaseFont helvetica = null;
    try {
        helvetica = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.EMBEDDED);
    } catch (Exception e) {
        //font exception
    }
    Font font = new Font(helvetica, 8, Font.NORMAL);
    pdfTable.addCell(new Paragraph("columnName", font));        

    for (int i = 0; i < lstPdfTable.size(); i++) { //lstPdfTable is the list from your datatable. A List of "itemOfList" type
        item = new itemOfList();
        item = lstPdfTable.get(i);
        //pdfTable.addCell(new Paragraph('any_string_field', font));
        pdfTable.addCell(new Paragraph(item.getStringField(), font));           
    }
    return pdfTable;
}

writePDFToResponse 方法是：

private void writePDFToResponse(ExternalContext externalContext, ByteArrayOutputStream baos, String fileName) {
    try {
        externalContext.responseReset();
        externalContext.setResponseContentType("application/pdf");
        externalContext.setResponseHeader("Expires", "0");
        externalContext.setResponseHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
        externalContext.setResponseHeader("Pragma", "public");
        externalContext.setResponseHeader("Content-disposition", "attachment;filename=" + fileName + ".pdf");
        externalContext.setResponseContentLength(baos.size());
        OutputStream out = externalContext.getResponseOutputStream();
        baos.writeTo(out);
        externalContext.responseFlushBuffer();
    } catch (Exception e) {
        //e.printStackTrace();
    }
}
于 2013-06-21T17:24:56.820 回答
4

The primefaces documentation (as of 4.0) does not mention any ability to write a custom data exporter, only pre & post processors, which in the case of PDF prevents you from doing extensive modifications to data, etc.

But what you can do is create a package in your project called

org.primefaces.component.export

and copy ExporterFactory.java from primefaces source. You can then replace the original PDFExporter call with your own implementation.

The exporter implementation is fairly simple. It uses iText library (although an outdated version) and you can easily extend it to your needs.

An obvious problem with this approach is that you may have to be extra careful when (and if) you are updating your primefaces library in the future.

于 2014-01-22T12:47:59.693 回答