Java和itext7实现的pdf文件签章

/* package com.com.itext.day3; */ /* This file is part of the iText (R) project. Copyright (c) 1998-2018 iText Group NV Authors: iText Software. For more information, please contact iText Software at this address: sales@itextpdf.com *//* */ /* * This example is part of the iText 7 tutorial. *//* import com.itextpdf.io.font.FontRegisterProvider; import com.itextpdf.kernel.color.Color; import com.itextpdf.kernel.colors.ColorConstants; import com.itextpdf.kernel.color.DeviceCmyk; import com.itextpdf.kernel.events.Event; import com.itextpdf.kernel.events.IEventHandler; import com.itextpdf.kernel.events.PdfDocumentEvent; import com.itextpdf.kernel.font.PdfFont; import com.itextpdf.kernel.font.PdfFontFactory; import com.itextpdf.kernel.geom.Rectangle; import com.itextpdf.kernel.pdf.PdfDocument; import com.itextpdf.kernel.pdf.PdfPage; import com.itextpdf.kernel.pdf.PdfWriter; import com.itextpdf.kernel.pdf.canvas.PdfCanvas; import com.itextpdf.layout.Canvas; import com.itextpdf.layout.Document; import com.itextpdf.layout.border.SolidBorder; import com.itextpdf.layout.element.Cell; import com.itextpdf.layout.element.Paragraph; import com.itextpdf.layout.element.Table; import com.itextpdf.layout.property.Property; import com.itextpdf.layout.property.TextAlignment; import com.itextpdf.layout.property.UnitValue; import com.itextpdf.layout.property.VerticalAlignment; import com.itextpdf.test.annotations.WrapToTest; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.util.StringTokenizer; */ /** * Simple event handler example. *//* @WrapToTest public class C03E03_UFO { public static final String DATA = "src/main/resources/data/ufo.csv"; public static final String DEST = "results/chapter03/ufo.pdf"; static PdfFont helvetica = null; static PdfFont helveticaBold = null; public static void main(String[] args) throws Exception { helvetica = PdfFontFactory.createFont(StandardFonts.HELVETICA); helveticaBold = PdfFontFactory.createFont(StandardFonts.HELVETICA_BOLD); File file = new File(DEST); file.getParentFile().mkdirs(); new C03E03_UFO().createPdf(DEST); } protected void createPdf(String dest) throws Exception { //Initialize PDF document PdfDocument pdf = new PdfDocument(new PdfWriter(dest)); pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler()); // Initialize document Document document = new Document(pdf); Paragraph p = new Paragraph("List of reported UFO sightings in 20th century") .setTextAlignment(TextAlignment.CENTER).setFont(helveticaBold).setFontSize(14); document.add(p); Table table = new Table(UnitValue.createPercentArray(new float[]{3, 5, 7, 4})); BufferedReader br = new BufferedReader(new FileReader(DATA)); String line = br.readLine(); process(table, line, helveticaBold, true); while ((line = br.readLine()) != null) { process(table, line, helvetica, false); } br.close(); document.add(table); document.close(); } public void process(Table table, String line, PdfFont font, boolean isHeader) { StringTokenizer tokenizer = new StringTokenizer(line, ";"); while (tokenizer.hasMoreTokens()) { if (isHeader) { table.addHeaderCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(ColorConstants.BLACK, 0.5f))); } else { table.addCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(ColorConstants.BLACK, 0.5f))); } } } protected class MyEventHandler implements IEventHandler { public void handleEvent(Event event) { PdfDocumentEvent docEvent = (PdfDocumentEvent) event; PdfDocument pdfDoc = docEvent.getDocument(); PdfPage page = docEvent.getPage(); int pageNumber = pdfDoc.getPageNumber(page); Rectangle pageSize = page.getPageSize(); PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc); //Set background Color limeColor = new DeviceCmyk(0.208f, 0, 0.584f, 0); Color blueColor = new DeviceCmyk(0.445f, 0.0546f, 0, 0.0667f); pdfCanvas.saveState() .setFillColor(pageNumber % 2 == 1 ? limeColor : blueColor) .rectangle(pageSize.getLeft(), pageSize.getBottom(), pageSize.getWidth(), pageSize.getHeight()) .fill().restoreState(); //Add header and footer pdfCanvas.beginText() .setFontAndSize(helvetica, 9) .moveText(pageSize.getWidth() / 2 - 60, pageSize.getTop() - 20) .showText("THE TRUTH IS OUT THERE") .moveText(60, -pageSize.getTop() + 30) .showText(String.valueOf(pageNumber)) .endText(); //Add watermark Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize()); canvas.setFontColor(ColorConstants.WHITE); canvas.setProperty(Property.FONT_SIZE, UnitValue.createPointValue(60)); canvas.setProperty(Property.FONT, helveticaBold); canvas.showTextAligned(new Paragraph("CONFIDENTIAL"), 298, 421, pdfDoc.getPageNumber(page), TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45); pdfCanvas.release(); } } }*/