itext7学习笔记

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来源：https://blog.csdn.net/u012397189/category_9270695.html

itext7学习笔记——第3章实践&example

转x33g5p2x  于2021-12-28 转载在 其他  
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本章的例子，请参考我翻译的博文：itext7学习笔记——第3章,里面有详细的解释,有什么不懂得也可以评论或者私信我！

例子1：撰写日报

页面划分成三栏，然后添加文本和图片，代码如下：

  1. import com.itextpdf.io.font.FontConstants;
  2. import com.itextpdf.io.image.ImageDataFactory;
  3. import com.itextpdf.kernel.color.Color;
  4. import com.itextpdf.kernel.font.PdfFont;
  5. import com.itextpdf.kernel.font.PdfFontFactory;
  6. import com.itextpdf.kernel.geom.PageSize;
  7. import com.itextpdf.kernel.geom.Rectangle;
  8. import com.itextpdf.kernel.pdf.*;
  9. import com.itextpdf.layout.ColumnDocumentRenderer;
  10. import com.itextpdf.layout.Document;
  11. import com.itextpdf.layout.element.*;
  13. import java.io.*;
  14. import java.nio.charset.StandardCharsets;
  15. import java.nio.file.Files;
  16. import java.nio.file.Paths;
  18. /** * Simple column renderer example. */
  19. public class C03E01_NewYorkTimes {
  21.     public static final String DEST = "results/chapter03/new_york_times.pdf";
  23.     public static final String APPLE_IMG = "src/main/resources/img/ny_times_apple.jpg";
  24.     public static final String APPLE_TXT = "src/main/resources/data/ny_times_apple.txt";
  25.     public static final String FACEBOOK_IMG = "src/main/resources/img/ny_times_fb.jpg";
  26.     public static final String FACEBOOK_TXT = "src/main/resources/data/ny_times_fb.txt";
  27.     public static final String INST_IMG = "src/main/resources/img/ny_times_inst.jpg";
  28.     public static final String INST_TXT = "src/main/resources/data/ny_times_inst.txt";
  30.     static PdfFont timesNewRoman = null;
  31.     static PdfFont timesNewRomanBold = null;
  33.     public static void main(String[] args) throws Exception {
  34.         timesNewRoman = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
  35.         timesNewRomanBold = PdfFontFactory.createFont(FontConstants.TIMES_BOLD);
  36.         File file = new File(DEST);
  37.         file.getParentFile().mkdirs();
  38.         new C03E01_NewYorkTimes().createPdf(DEST);
  39.     }
  41.     protected void createPdf(String dest) throws Exception {
  43.         //Initialize PDF document
  44.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  45.         PageSize ps = PageSize.A5;
  47.         // Initialize document
  48.         Document document = new Document(pdf, ps);
  50.         //Set column parameters
  51.         float offSet = 36;
  52.         float columnWidth = (ps.getWidth() - offSet * 2 + 10) / 3;
  53.         float columnHeight = ps.getHeight() - offSet * 2;
  55.         //Define column areas
  56.         Rectangle[] columns = {new Rectangle(offSet - 5, offSet, columnWidth, columnHeight),
  57.                 new Rectangle(offSet + columnWidth, offSet, columnWidth, columnHeight),
  58.                 new Rectangle(offSet + columnWidth * 2 + 5, offSet, columnWidth, columnHeight)};
  59.         document.setRenderer(new ColumnDocumentRenderer(document, columns));
  61.         Image apple = new Image(ImageDataFactory.create(APPLE_IMG)).setWidth(columnWidth);
  62.         String articleApple = new String(Files.readAllBytes(Paths.get(APPLE_TXT)), StandardCharsets.UTF_8);
  63.         C03E01_NewYorkTimes.addArticle(document, "Apple Encryption Engineers, if Ordered to Unlock iPhone, Might Resist", "By JOHN MARKOFF MARCH 18, 2016", apple, articleApple);
  64.         Image facebook = new Image(ImageDataFactory.create(FACEBOOK_IMG)).setWidth(columnWidth);
  65.         String articleFB = new String(Files.readAllBytes(Paths.get(FACEBOOK_TXT)), StandardCharsets.UTF_8);
  66.         C03E01_NewYorkTimes.addArticle(document, "With \"Smog Jog\" Through Beijing, Zuckerberg Stirs Debate on Air Pollution", "By PAUL MOZUR MARCH 18, 2016", facebook, articleFB);
  67.         Image inst = new Image(ImageDataFactory.create(INST_IMG)).setWidth(columnWidth);
  68.         String articleInstagram = new String(Files.readAllBytes(Paths.get(INST_TXT)), StandardCharsets.UTF_8);
  69.         C03E01_NewYorkTimes.addArticle(document, "Instagram May Change Your Feed, Personalizing It With an Algorithm","By MIKE ISAAC MARCH 15, 2016", inst, articleInstagram);
  71.         document.close();
  73.     }
  75.     public static void addArticle(Document doc, String title, String author, Image img, String text) throws IOException {
  76.         Paragraph p1 = new Paragraph(title)
  77.                 .setFont(timesNewRomanBold)
  78.                 .setFontSize(14);
  79.         doc.add(p1);
  80.         doc.add(img);
  81.         Paragraph p2 = new Paragraph()
  82.                 .setFont(timesNewRoman)
  83.                 .setFontSize(7)
  84.                 .setFontColor(Color.GRAY)
  85.                 .add(author);
  86.         doc.add(p2);
  87.         Paragraph p3 = new Paragraph()
  88.                 .setFont(timesNewRoman)
  89.                 .setFontSize(10)
  90.                 .add(text);
  91.         doc.add(p3);
  92.     }
  93. }

例子2：不一样的表格

绘制一个表格，第一栏为圆角单元格，每一列的背景颜色不同，根据列号而定，代码如下：

  1. import com.itextpdf.io.font.FontConstants;
  2. import com.itextpdf.kernel.color.Color;
  3. import com.itextpdf.kernel.color.DeviceCmyk;
  4. import com.itextpdf.kernel.font.PdfFont;
  5. import com.itextpdf.kernel.font.PdfFontFactory;
  6. import com.itextpdf.kernel.geom.PageSize;
  7. import com.itextpdf.kernel.geom.Rectangle;
  8. import com.itextpdf.kernel.pdf.PdfDocument;
  9. import com.itextpdf.kernel.pdf.PdfWriter;
  10. import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
  11. import com.itextpdf.layout.Document;
  12. import com.itextpdf.layout.property.HorizontalAlignment;
  13. import com.itextpdf.layout.border.SolidBorder;
  14. import com.itextpdf.layout.element.Cell;
  15. import com.itextpdf.layout.element.Paragraph;
  16. import com.itextpdf.layout.element.Table;
  17. import com.itextpdf.layout.property.TextAlignment;
  18. import com.itextpdf.layout.renderer.CellRenderer;
  19. import com.itextpdf.layout.renderer.DrawContext;
  21. import java.io.*;
  22. import java.util.StringTokenizer;
  24. /** * Simple table renderer example. */
  25. public class C03E02_PremierLeague {
  27.     public static final String DATA = "src/main/resources/data/premier_league.csv";
  28.     public static final String DEST = "results/chapter03/premier_league.pdf";
  30.     Color greenColor = new DeviceCmyk(0.78f, 0, 0.81f, 0.21f);
  31.     Color yellowColor = new DeviceCmyk(0, 0, 0.76f, 0.01f);
  32.     Color redColor = new DeviceCmyk(0, 0.76f, 0.86f, 0.01f);
  33.     Color blueColor = new DeviceCmyk(0.28f, 0.11f, 0, 0);
  35.     public static void main(String args[]) throws IOException {
  36.         File file = new File(DEST);
  37.         file.getParentFile().mkdirs();
  38.         new C03E02_PremierLeague().createPdf(DEST);
  39.     }
  41.     public void createPdf(String dest) throws IOException {
  43.         //Initialize PDF document
  44.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  45.         PageSize ps = new PageSize(842, 680);
  47.         // Initialize document
  48.         Document document = new Document(pdf, ps);
  50.         PdfFont font = PdfFontFactory.createFont(FontConstants.HELVETICA);
  51.         PdfFont bold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
  52.         Table table = new Table(new float[]{1.5f, 7, 2, 2, 2, 2, 3, 4, 4, 2});
  53.         table.setWidthPercent(100)
  54.                 .setTextAlignment(TextAlignment.CENTER)
  55.                 .setHorizontalAlignment(HorizontalAlignment.CENTER);
  57.         BufferedReader br = new BufferedReader(new FileReader(DATA));
  58.         String line = br.readLine();
  59.         process(table, line, bold, true);
  60.         while ((line = br.readLine()) != null) {
  61.             process(table, line, font, false);
  62.         }
  63.         br.close();
  65.         document.add(table);
  67.         //Close document
  68.         document.close();
  70.     }
  72.     public void process(Table table, String line, PdfFont font, boolean isHeader) {
  73.         StringTokenizer tokenizer = new StringTokenizer(line, ";");
  74.         int columnNumber = 0;
  75.         while (tokenizer.hasMoreTokens()) {
  76.             if (isHeader) {
  77.                 Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
  78.                 cell.setNextRenderer(new RoundedCornersCellRenderer(cell));
  79.                 cell.setPadding(5).setBorder(null);
  80.                 table.addHeaderCell(cell);
  81.             } else {
  82.                 columnNumber++;
  83.                 Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
  84.                 cell.setFont(font).setBorder(new SolidBorder(Color.BLACK, 0.5f));
  85.                 switch (columnNumber) {
  86.                     case 4:
  87.                         cell.setBackgroundColor(greenColor);
  88.                         break;
  89.                     case 5:
  90.                         cell.setBackgroundColor(yellowColor);
  91.                         break;
  92.                     case 6:
  93.                         cell.setBackgroundColor(redColor);
  94.                         break;
  95.                     default:
  96.                         cell.setBackgroundColor(blueColor);
  97.                         break;
  98.                 }
  99.                 table.addCell(cell);
  100.             }
  101.         }
  102.     }
  104.     private class RoundedCornersCellRenderer extends CellRenderer {
  105.         public RoundedCornersCellRenderer(Cell modelElement) {
  106.             super(modelElement);
  107.         }
  109.         @Override
  110.         public void drawBorder(DrawContext drawContext) {
  111.             Rectangle rectangle = getOccupiedAreaBBox();
  112.             float llx = rectangle.getX() + 1;
  113.             float lly = rectangle.getY() + 1;
  114.             float urx = rectangle.getX() + getOccupiedAreaBBox().getWidth() - 1;
  115.             float ury = rectangle.getY() + getOccupiedAreaBBox().getHeight() - 1;
  116.             PdfCanvas canvas = drawContext.getCanvas();
  117.             float r = 4;
  118.             float b = 0.4477f;
  119.             canvas.moveTo(llx, lly).lineTo(urx, lly).lineTo(urx, ury - r)
  120.                     .curveTo(urx, ury - r * b, urx - r * b, ury, urx - r, ury)
  121.                     .lineTo(llx + r, ury)
  122.                     .curveTo(llx + r * b, ury, llx, ury - r * b, llx, ury - r)
  123.                     .lineTo(llx, lly).stroke();
  124.             super.drawBorder(drawContext);
  125.         }
  126.     }

例子3:添加页眉、页脚和水印

绘制一个表格，奇偶页背景颜色不同，添加页眉、页脚和水印，代码如下：

  1. import com.itextpdf.io.font.FontConstants;
  2. import com.itextpdf.kernel.color.Color;
  3. import com.itextpdf.kernel.color.DeviceCmyk;
  4. import com.itextpdf.kernel.events.Event;
  5. import com.itextpdf.kernel.events.IEventHandler;
  6. import com.itextpdf.kernel.events.PdfDocumentEvent;
  7. import com.itextpdf.kernel.font.PdfFont;
  8. import com.itextpdf.kernel.font.PdfFontFactory;
  9. import com.itextpdf.kernel.geom.Rectangle;
  10. import com.itextpdf.kernel.pdf.PdfDocument;
  11. import com.itextpdf.kernel.pdf.PdfPage;
  12. import com.itextpdf.kernel.pdf.PdfWriter;
  13. import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
  14. import com.itextpdf.layout.Canvas;
  15. import com.itextpdf.layout.Document;
  16. import com.itextpdf.layout.border.SolidBorder;
  17. import com.itextpdf.layout.element.Cell;
  18. import com.itextpdf.layout.element.Paragraph;
  19. import com.itextpdf.layout.element.Table;
  20. import com.itextpdf.layout.property.Property;
  21. import com.itextpdf.layout.property.TextAlignment;
  22. import com.itextpdf.layout.property.UnitValue;
  23. import com.itextpdf.layout.property.VerticalAlignment;
  25. import java.io.BufferedReader;
  26. import java.io.File;
  27. import java.io.FileReader;
  28. import java.util.StringTokenizer;
  30. /** * Simple event handler example. */
  31. public class C03E03_UFO {
  33.     public static final String DATA = "src/main/resources/data/ufo.csv";
  34.     public static final String DEST = "results/chapter03/ufo.pdf";
  36.     static PdfFont helvetica = null;
  37.     static PdfFont helveticaBold = null;
  39.     public static void main(String[] args) throws Exception {
  40.         helvetica = PdfFontFactory.createFont(FontConstants.HELVETICA);
  41.         helveticaBold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
  42.         File file = new File(DEST);
  43.         file.getParentFile().mkdirs();
  44.         new C03E03_UFO().createPdf(DEST);
  45.     }
  47.     protected void createPdf(String dest) throws Exception {
  49.         //Initialize PDF document
  50.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  51.         pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler());
  53.         // Initialize document
  54.         Document document = new Document(pdf);
  56.         Paragraph p = new Paragraph("List of reported UFO sightings in 20th century")
  57.                 .setTextAlignment(TextAlignment.CENTER).setFont(helveticaBold).setFontSize(14);
  58.         document.add(p);
  60.         Table table = new Table(UnitValue.createPercentArray(new float[]{3, 5, 7, 4}));
  62.         BufferedReader br = new BufferedReader(new FileReader(DATA));
  63.         String line = br.readLine();
  64.         process(table, line, helveticaBold, true);
  65.         while ((line = br.readLine()) != null) {
  66.             process(table, line, helvetica, false);
  67.         }
  68.         br.close();
  70.         document.add(table);
  72.         document.close();
  73.     }
  75.     public void process(Table table, String line, PdfFont font, boolean isHeader) {
  76.         StringTokenizer tokenizer = new StringTokenizer(line, ";");
  77.         while (tokenizer.hasMoreTokens()) {
  78.             if (isHeader) {
  79.                 table.addHeaderCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
  80.             } else {
  81.                 table.addCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
  82.             }
  83.         }
  84.     }
  86.     protected class MyEventHandler implements IEventHandler {
  88.         public void handleEvent(Event event) {
  89.             PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
  90.             PdfDocument pdfDoc = docEvent.getDocument();
  91.             PdfPage page = docEvent.getPage();
  92.             int pageNumber = pdfDoc.getPageNumber(page);
  93.             Rectangle pageSize = page.getPageSize();
  94.             PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc);
  96.             //Set background
  97.             Color limeColor = new DeviceCmyk(0.208f, 0, 0.584f, 0);
  98.             Color blueColor = new DeviceCmyk(0.445f, 0.0546f, 0, 0.0667f);
  99.             pdfCanvas.saveState()
  100.                     .setFillColor(pageNumber % 2 == 1 ? limeColor : blueColor)
  101.                     .rectangle(pageSize.getLeft(), pageSize.getBottom(), pageSize.getWidth(), pageSize.getHeight())
  102.                     .fill().restoreState();
  104.             //Add header and footer
  105.             pdfCanvas.beginText()
  106.                     .setFontAndSize(helvetica, 9)
  107.                     .moveText(pageSize.getWidth() / 2 - 60, pageSize.getTop() - 20)
  108.                     .showText("THE TRUTH IS OUT THERE")
  109.                     .moveText(60, -pageSize.getTop() + 30)
  110.                     .showText(String.valueOf(pageNumber))
  111.                     .endText();
  113.             //Add watermark
  114.             Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize());
  115.             canvas.setFontColor(Color.WHITE);
  116.             canvas.setProperty(Property.FONT_SIZE, 60);
  117.             canvas.setProperty(Property.FONT, helveticaBold);
  118.             canvas.showTextAligned(new Paragraph("CONFIDENTIAL"), 298, 421, pdfDoc.getPageNumber(page),
  119.                     TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
  121.             pdfCanvas.release();
  122.         }
  123.     }
  124. }

Example代码下载

本章代码可在如下地址下载（IDEA工程）：iText7——第三章源代码工程

版权说明 : 本文为转载文章, 版权归原作者所有 版权申明

原文链接 : https://blog.csdn.net/u012397189/article/details/77541052

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