我们使用漂亮的库iText作为我客户的一个项目，从表示html页面的字符串生成pdf . iText版本是5.5.10 .

以下代码适用于在Windows上运行的开发环境和服务器，但它不适用于在iSeries上运行的客户服务器 .

public class GeneratePDFCmdImpl extends ControllerCommandImpl implements
    GeneratePDFCmd {

        private String charsetStr = null;
        private Charset charset = null;
        private BaseFont bf = null;
        private String destFile = null;
        private String destFilename = null;
        private String srcContent = null;
        private String docName = null;

        public void setDocName(String docname) {
            this.docName = docname;
        }

        public void setSrcContent(String srcContent) {
            this.srcContent = srcContent;
        }

        private void prepareDefaultsAndSettings() {

            /* srcContent may be more complex html but even this simple one is not working */
            srcContent = "<html><head></head><body>This is just a test</body></html>";
            docName = "mypdf";

            charsetStr = "UTF-8";

            destFilename = docName+".pdf";          

            Date timestamp = new Date();

            /* destFile = "/" is just for the sample. In my real project, the value is a folder where my app has full rights
            */
            destFile = "/" + destFilename;
            charset = Charset.forName(charsetStr);

            FontFactory.register("/fonts/arial.ttf","Arial");
            bf = FontFactory.getFont("Arial").getBaseFont();

        }

        @Override
        public void performExecute() throws ECException {
            super.performExecute();

            Document document =  null;
            OutputStream os = null;

            prepareDefaultsAndSettings();

            try { 


                InputStream srcInputStream;     
                srcInputStream = new ByteArrayInputStream(srcContent.getBytes(charset));


                document = new Document(PageSize.A4, 20, 20, 75, 80);

                FileOutputStream destOutput =  new FileOutputStream(destFile);

                PdfWriter writer = PdfWriter.getInstance(document,destOutput);
                writer.setPageEvent( new HeaderFooterPageEvent(bf));

                document.open();  
                XMLWorkerHelper.getInstance().parseXHtml(writer, document, srcInputStream, charset);           
                document.close();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (DocumentException e) {
                e.printStackTrace();
            } finally {
                if(document != null) {
                    document.close();
                }
                document = null;
                try {
                    if (os != null) {
                        os.close();
                    }
                } catch(IOException e) {
                    e.printStackTrace();
                }
                os = null;
            }



        }



        private class HeaderFooterPageEvent extends PdfPageEventHelper {

            PdfContentByte cb;
            PdfTemplate template;
            BaseFont  bf;
            Font f;
            float fs;

            public HeaderFooterPageEvent(BaseFont _bf) {
                super();
                bf = _bf;
                f = new Font(bf);
            }


            @Override
            public void onOpenDocument(PdfWriter writer, Document document) {
                 cb = writer.getDirectContent();
                 template = cb.createTemplate(50, 50);
            }


             @Override
            public void onEndPage(PdfWriter writer, Document document) {
                Date dat = new Date();      
                ColumnText ct = new ColumnText(writer.getDirectContent());
                SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm");
                ct.showTextAligned(writer.getDirectContent(), Element.ALIGN_CENTER, new Phrase(sdf.format(dat) ), 100, 30, 0);

                String text = "Page " +writer.getPageNumber() + " to ";
                float len = bf.getWidthPoint(text, 12);
                cb.beginText();
                cb.setFontAndSize(bf, 12);
                cb.setTextMatrix(450, 30);
                cb.showText(text);
                cb.endText();
                cb.addTemplate(template, 450 + len, 30);     
            }

            @Override
            public void onCloseDocument(PdfWriter writer, Document document) {
                   template.beginText();
                   template.setFontAndSize(bf, 12);
                   template.showText(String.valueOf(writer.getPageNumber()));
                   template.endText();
            }

        }       
    }

在iSeries上执行时，我们会收到错误消息

com.ibm.commerce.command.ECCommandTarget executeCommand CMN0420E: The following command exception has occurred during processing: "ExceptionConverter: java.io.IOException: The document has no pages.". ExceptionConverter: java.io.IOException: The document has no pages.
        at com.itextpdf.text.pdf.PdfPages.writePageTree(PdfPages.java:112)
        at com.itextpdf.text.pdf.PdfWriter.close(PdfWriter.java:1256)
        at com.itextpdf.text.pdf.PdfDocument.close(PdfDocument.java:900)
        at com.itextpdf.text.Document.close(Document.java:415)
        at be.ourcustomer.package.GeneratePDFCmdImpl.performExecute(GeneratePDFCmdImpl.java:107)

我对自己做错了什么并不太了解 . 任何帮助将不胜感激

itext ibm-midrange