java - itext 字体颜色在第一页变暗

Question

我正在使用 iText 2.1.7，我正在使用 writer.getDirectcontent() 方法在绝对位置添加页眉和页脚。一切正常，除了第一页中的字体比第二页更暗。

注意第一页和第二页的页眉和页脚

有什么帮助吗？

这是我做的

Reader stringReader = new StringReader(svgXmlDoc);

    Document document = new Document(PageSize.A4.rotate());

    ByteArrayOutputStream content = new ByteArrayOutputStream();
    try {

        PdfWriter writer = PdfWriter.getInstance(document, content);

        document.open();

        PdfService event = new PdfService();
        event.setHeader(date.toString());

        event.onOpenDocument(writer, document);
        event.onEndPage(writer, document);
        event.onCloseDocument(writer, document);
        writer.setPageEvent(event);

        Image image1 = Image.getInstance("Infinity-Loop.png");

        image1.scalePercent(35);

        PdfPTable signature = new PdfPTable(numberOfSignature);

        signature.setTotalWidth(document.getPageSize().getWidth()
                - document.leftMargin() - document.rightMargin());
        signature.setLockedWidth(true);
        signature.setWidthPercentage(100);
        signature.getDefaultCell().setFixedHeight(20);

        signature.getDefaultCell().setHorizontalAlignment(
                Element.ALIGN_RIGHT);
        for (int i = 0; i < numberOfSignature; i++) {
            PdfPCell cell = new PdfPCell(new Paragraph(
                    String.valueOf("____________")));
            cell.setBorder(Rectangle.NO_BORDER);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            signature.addCell(cell);
        }

        PdfPTable header = new PdfPTable(3);

        float[] columnWidths = {1f,2f,1f};
         header.setWidths(columnWidths);
        header.setTotalWidth(document.getPageSize().getWidth()
                - document.leftMargin() - document.rightMargin());
        header.setLockedWidth(true);
        header.setWidthPercentage(100);
         header.getDefaultCell().setPadding(15);
        header.getDefaultCell().setBorder(Rectangle.NO_BORDER);

        PdfPCell logocell = new PdfPCell(image1, false);
        logocell.setRowspan(3);
        logocell.setFixedHeight(72);
        logocell.setBorder(Rectangle.NO_BORDER);
        header.addCell(logocell);

        PdfPCell Title = new PdfPCell(new Phrase(title,
                FontFactory.getFont(FontFactory.TIMES_ROMAN, 18,
                        Font.PLAIN, new Color(0, 0, 0))));
        Title.setBorder(Rectangle.NO_BORDER);
        Title.setHorizontalAlignment(Element.ALIGN_CENTER);
        header.addCell(Title);
        header.addCell("");
        header.completeRow();
        PdfPCell SubTitle = new PdfPCell(new Phrase(subTitle));
        SubTitle.setBorder(Rectangle.NO_BORDER);
        SubTitle.setHorizontalAlignment(Element.ALIGN_CENTER);
        header.addCell(SubTitle);
        header.addCell("");
        header.completeRow();
        PdfPCell dataRange = new PdfPCell(new Phrase(
                dateRange));
        dataRange.setBorder(Rectangle.NO_BORDER);
        dataRange.setHorizontalAlignment(Element.ALIGN_CENTER);
        header.addCell(dataRange);
        header.addCell("");
        header.completeRow();
        ArrayList tmp = header.getRows(0, header.getRows().size());
        header.getRows().clear();
        header.getRows().addAll(tmp);

        int width = (int) ((int) document.getPageSize().getWidth()
                - document.leftMargin() - document.rightMargin());
        int height = 350;
        PdfContentByte cb = writer.getDirectContent();
        PdfTemplate template = cb.createTemplate(width, height);
        Graphics2D g2 = template.createGraphics(width, height);

        PrintTranscoder prm = new PrintTranscoder();
        TranscoderInput ti = new TranscoderInput(stringReader);
        prm.transcode(ti, null);

        PageFormat pg = new PageFormat();
        Paper pp = new Paper();
        pp.setSize(width, height);
        pp.setImageableArea(0, 0, width, height);
        pg.setPaper(pp);
        prm.print(g2, pg, 0);
        g2.dispose();

        ImgTemplate img = new ImgTemplate(template);
        img.setAbsolutePosition(document.left(), document.topMargin() + 100);
        document.add(img);
        signature.writeSelectedRows(0, -1, document.left(),
                document.bottom() + document.bottomMargin() * 2,
                writer.getDirectContent());

        header.writeSelectedRows(0, -1, document.left(), document.top(),
                writer.getDirectContent());
        document.newPage();

    PdfPTable statisticsTitle=new PdfPTable(1);
    statisticsTitle.setTotalWidth(document.right() - document.left());
    statisticsTitle.setWidthPercentage(100);
    PdfPCell titleCell= new PdfPCell(new Paragraph("Statistics Report"));
    titleCell.setBorder(Rectangle.NO_BORDER);
    titleCell.setHorizontalAlignment(Element.ALIGN_CENTER);
    statisticsTitle.addCell(titleCell);
    statisticsTitle.writeSelectedRows(0, -1, document.left(), document.top()
            - document.topMargin() * 2 - 10, writer.getDirectContent());

        PdfPTable table;
        if(measurementType.equals("Temp")){
            table = new PdfPTable(6);
        }
        else{
            table = new PdfPTable(11);
        }
        table.setTotalWidth(document.right() - document.left());
        table.setWidthPercentage(100);
        table.setHeaderRows(1);


        PdfPCell h1 = new PdfPCell(new Paragraph("Description"));
        h1.setGrayFill(0.7f);
        h1.setRowspan(2);
        h1.setVerticalAlignment(Element.ALIGN_MIDDLE);
        h1.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(h1);

        PdfPCell h2 = new PdfPCell(new Paragraph("Temperature"));
        h2.setGrayFill(0.7f);
        h2.setColspan(5);
        h2.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(h2);

        if(measurementType.equals("TempHumi")){
            PdfPCell h3 = new PdfPCell(new Paragraph("Humidity"));
            h3.setGrayFill(0.7f);
            h3.setColspan(5);
            h3.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(h3);
        }
        table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
        PdfPCell tc1 = new PdfPCell(new Paragraph("Min"));
        tc1.setGrayFill(0.7f);
        tc1.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(tc1);

        PdfPCell tc2 = new PdfPCell(new Paragraph("Max"));
        tc2.setGrayFill(0.7f);
        tc2.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(tc2);

        PdfPCell tc3 = new PdfPCell(new Paragraph("Avg"));
        tc3.setGrayFill(0.7f);
        tc3.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(tc3);

        PdfPCell tc4 = new PdfPCell(new Paragraph("Std"));
        tc4.setGrayFill(0.7f);
        tc4.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(tc4);

        PdfPCell tc5 = new PdfPCell(new Paragraph("Mkt"));
        tc5.setGrayFill(0.7f);
        tc5.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(tc5);

        if(measurementType.equals("TempHumi")){
        PdfPCell hc1 = new PdfPCell(new Paragraph("Min"));
        hc1.setGrayFill(0.7f);
        hc1.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(hc1);

        PdfPCell hc2 = new PdfPCell(new Paragraph("Max"));
        hc2.setGrayFill(0.7f);
        hc2.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(hc2);

        PdfPCell hc3 = new PdfPCell(new Paragraph("Avg"));
        hc3.setGrayFill(0.7f);
        hc3.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(hc3);

        PdfPCell hc4 = new PdfPCell(new Paragraph("Std"));
        hc4.setGrayFill(0.7f);
        hc4.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(hc4);

        PdfPCell hc5 = new PdfPCell(new Paragraph("Mkt"));
        hc5.setGrayFill(0.7f);
        hc5.setHorizontalAlignment(Element.ALIGN_CENTER);
        table.addCell(hc5);
        }



        ArrayList tmpTable = table.getRows(0, table.getRows().size());
        table.getRows().clear();
        table.getRows().addAll(tmpTable);

        JsonObject listloggerdatastatistics = ReportService
                .getStatisticsDetails(serialnumberlist);

        System.out.println("Json "+listloggerdatastatistics.get("Sensormodellist"));

        for (int row = 0; row < listloggerdatastatistics.get("Sensormodellist").getAsJsonArray().size(); row++) {
            JsonObject jsonobj=listloggerdatastatistics.get("Sensormodellist").getAsJsonArray().get(row).getAsJsonObject();
            if (row > 20 && row % 21 == 0) {

                table.completeRow();

                table.writeSelectedRows(0, 22, document.left(),
                        document.top() - document.topMargin() * 2 - 10,
                        writer.getDirectContent());
                table.deleteBodyRows();
                table.setSkipFirstHeader(true);
                signature.writeSelectedRows(0, -1, document.left(),
                        document.bottom() + document.bottomMargin() * 3,
                        writer.getDirectContent());

                header.writeSelectedRows(0, -1, document.left(),
                        document.top(), writer.getDirectContent());

                document.newPage();
            }



            table.addCell(jsonobj.get("Modeltype").getAsString());
            table.addCell(""+jsonobj.get("Mintemperature").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
            table.addCell(""+jsonobj.get("Maxtemperature").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
            table.addCell(""+jsonobj.get("Avgtemperature").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
            table.addCell(""+jsonobj.get("Stdtemperature").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
            table.addCell(""+jsonobj.get("Mkttemperature").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
            if(measurementType.equals("TempHumi")){
                table.addCell(""+jsonobj.get("Minhumidity").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
                table.addCell(""+jsonobj.get("Maxhumidity").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
                table.addCell(""+jsonobj.get("Avghumidity").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
                table.addCell(""+jsonobj.get("Stdhumidity").getAsBigDecimal().setScale(2, RoundingMode.HALF_UP));
                table.addCell("-");
            }


        }

        table.completeRow();
        table.writeSelectedRows(0, -1, document.left(), document.top()
                - document.topMargin() * 3 - 10, writer.getDirectContent());
        signature.writeSelectedRows(0, -1, document.left(),
                document.bottom() + document.bottomMargin() * 2,
                writer.getDirectContent());
        header.writeSelectedRows(0, -1, document.left(), document.top(),
                writer.getDirectContent());


    } catch (DocumentException e) {
        System.err.println(e);
    }
    document.close();
    content.close();

我正在从 SVG 构建图形图像，表格数据是从数据库中填充的

为第 X 页(共 Y 页)添加页脚的事件处理程序

public class PdfService extends PdfPageEventHelper {
/** The header text. */
String header;
/** The template with the total number of pages. */
PdfTemplate total;

/**
 * Fills out the total number of pages before the document is closed.
 * 
 * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(com.itextpdf.text.pdf.PdfWriter,
 *      com.itextpdf.text.Document)
 */
@Override
public void onCloseDocument(PdfWriter writer, Document document) {
    total.reset();
    ColumnText
            .showTextAligned(total, Element.ALIGN_LEFT,
                    new Phrase(String.valueOf(writer.getPageNumber() - 1)),
                    2, 2, 0);

}

/**
 * Adds a header to every page
 * 
 * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(com.itextpdf.text.pdf.PdfWriter,
 *      com.itextpdf.text.Document)
 */
@Override
public void onEndPage(PdfWriter writer, Document document) {

    PdfPTable table = new PdfPTable(4);
    try {
        table.setWidths(new float[] { (float) (2.25), (float) (1.5), 11, 13 });
        table.setTotalWidth(document.getPageSize().getWidth()
                - document.leftMargin() - document.rightMargin());
        table.setLockedWidth(true);
        table.setWidthPercentage(100);
        table.getDefaultCell().setFixedHeight(20);
        table.getDefaultCell().setBorder(Rectangle.NO_BORDER);

        table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
        table.addCell(String.format("Page %d of", writer.getPageNumber()));
        Image img = Image.getInstance(total);
        Chunk conte = new Chunk(img, 0, 0);
        Phrase chunk = new Phrase(conte);

        PdfPCell cell = new PdfPCell(chunk);
        cell.setBorder(Rectangle.NO_BORDER);
        cell.setHorizontalAlignment(Element.ALIGN_LEFT);
        cell.setVerticalAlignment(Element.ALIGN_TOP);

        table.addCell(cell);
        table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
        table.addCell("SuperAdmin");
        table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
        table.addCell(header);
        table.writeSelectedRows(0, -1, document.leftMargin(),
                document.bottom(), writer.getDirectContent());

    } catch (DocumentException de) {
        throw new ExceptionConverter(de);
    }
}

/**
 * Creates the PdfTemplate that will hold the total number of pages.
 * 
 * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(com.itextpdf.text.pdf.PdfWriter,
 *      com.itextpdf.text.Document)
 */
@Override
public void onOpenDocument(PdfWriter writer, Document document) {
    total = writer.getDirectContent().createTemplate(15, 14);
    // total.setBoundingBox(new Rectangle(-1, 6, 20, 20));
}

/**
 * Allows us to change the content of the header.
 * 
 * @param header
 *            The new header String
 */
public void setHeader(String header) {
    this.header = header;
}
}

Answer 1

在过去，当人们有一个字体程序用于一种常规字体而没有单独的字体文件用于粗体字体时，人们找到了解决此问题的方法，并且 Adob​​e Reader 进行了调整以实现此解决方法。

解决方法包括在同一位置两次(或多次)写入相同的内容。当您添加一次“第 1 页，共 2 页”时，字体显示为常规字体。添加两次时，字体显示为粗体。

这就是您的情况:您添加了两次页脚。这是错误的:

document.open();
PdfService event = new PdfService();
event.setHeader(date.toString());
event.onOpenDocument(writer, document);
event.onEndPage(writer, document);
event.onCloseDocument(writer, document);
writer.setPageEvent(event);

您自己调用 event.onEndPage()，第一次添加页脚。当一个页面完成时，iText 第二次调用 onEndPage() 方法，再次添加页脚，从而产生粗体。

你应该像这样调整你的代码:

PdfService event = new PdfService();
event.setHeader(date.toString());
writer.setPageEvent(event);
document.open();

您应该在打开文档之前向PdfWriter 实例声明该事件。您不应该自己调用 onOpenDocument()、onEndPage() 和 onCloseDocument() 方法!它们由 iText 在内部调用。

出于 FAQ 中解释的原因，您还应该升级到最新版本. Using Open Source and contributing nothing in return is unwise. Supporting your open source communities isn’t charity, it’s good business.