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6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6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：缩放PDF

我们读取一个带有图片的PDF文档，生成新的文档，文档里面的内容是第一页缩小后的页面，第二页原始大小，第三页为放大后的页面，代码如下：

  1. import com.itextpdf.kernel.geom.AffineTransform;
  2. import com.itextpdf.kernel.geom.PageSize;
  3. import com.itextpdf.kernel.geom.Rectangle;
  4. import com.itextpdf.kernel.pdf.PdfDocument;
  5. import com.itextpdf.kernel.pdf.PdfPage;
  6. import com.itextpdf.kernel.pdf.PdfReader;
  7. import com.itextpdf.kernel.pdf.PdfWriter;
  8. import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
  9. import com.itextpdf.kernel.pdf.xobject.PdfFormXObject;
  11. import java.io.File;
  12. import java.io.IOException;
  14. public class C06E01_TheGoldenGateBridge_Scale_Shrink {
  15.     public static final String SRC = "src/main/resources/pdf/the_golden_gate_bridge.pdf";
  16.     public static final String DEST = "results/chapter06/the_golden_gate_bridge_scale_shrink.pdf";
  18.     public static void main(String args[]) throws IOException {
  19.         File file = new File(DEST);
  20.         file.getParentFile().mkdirs();
  21.         new C06E01_TheGoldenGateBridge_Scale_Shrink().createPdf(SRC, DEST);
  22.     }
  24.     public void createPdf(String src, String dest) throws IOException {
  25.         //Initialize PDF document
  26.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  27.         PdfDocument origPdf = new PdfDocument(new PdfReader(src));
  29.         //Original page size
  30.         PdfPage origPage = origPdf.getPage(1);
  31.         Rectangle orig = origPage.getPageSizeWithRotation();
  33.         //Add A4 page
  34.         PdfPage page = pdf.addNewPage(PageSize.A4.rotate());
  35.         //Shrink original page content using transformation matrix
  36.         PdfCanvas canvas = new PdfCanvas(page);
  37.         AffineTransform transformationMatrix = AffineTransform.getScaleInstance(page.getPageSize().getWidth() / orig.getWidth(), page.getPageSize().getHeight() / orig.getHeight());
  38.         canvas.concatMatrix(transformationMatrix);
  39.         PdfFormXObject pageCopy = origPage.copyAsFormXObject(pdf);
  40.         canvas.addXObject(pageCopy, 0, 0);
  42.         //Add page with original size
  43.         pdf.addPage(origPage.copyTo(pdf));
  45.         //Add A2 page
  46.         page = pdf.addNewPage(PageSize.A2.rotate());
  47.         //Scale original page content using transformation matrix
  48.         canvas = new PdfCanvas(page);
  49.         transformationMatrix = AffineTransform.getScaleInstance(page.getPageSize().getWidth() / orig.getWidth(), page.getPageSize().getHeight() / orig.getHeight());
  50.         canvas.concatMatrix(transformationMatrix);
  51.         canvas.addXObject(pageCopy, 0, 0);
  53.         pdf.close();
  54.         origPdf.close();
  55.     }
  56. }

例子2：分裂PDF

我们读取一个带有图片的PDF文档，把源文件分为4片，显示在新的文档的前4页，代码如下：

  1. import com.itextpdf.kernel.geom.AffineTransform;
  2. import com.itextpdf.kernel.geom.PageSize;
  3. import com.itextpdf.kernel.geom.Rectangle;
  4. import com.itextpdf.kernel.pdf.PdfDocument;
  5. import com.itextpdf.kernel.pdf.PdfPage;
  6. import com.itextpdf.kernel.pdf.PdfReader;
  7. import com.itextpdf.kernel.pdf.PdfWriter;
  8. import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
  9. import com.itextpdf.kernel.pdf.xobject.PdfFormXObject;
  11. import java.io.File;
  12. import java.io.IOException;
  14. public class C06E02_TheGoldenGateBridge_Tiles {
  15.     public static final String SRC = "src/main/resources/pdf/the_golden_gate_bridge.pdf";
  16.     public static final String DEST = "results/chapter06/the_golden_gate_bridge_tiles.pdf";
  18.     public static void main(String args[]) throws IOException {
  19.         File file = new File(DEST);
  20.         file.getParentFile().mkdirs();
  21.         new C06E02_TheGoldenGateBridge_Tiles().createPdf(SRC, DEST);
  22.     }
  24.     public void createPdf(String src, String dest) throws IOException {
  25.         //Initialize PDF document
  26.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  27.         PdfDocument sourcePdf = new PdfDocument(new PdfReader(src));
  29.         //Original page
  30.         PdfPage origPage = sourcePdf.getPage(1);
  31.         PdfFormXObject pageCopy = origPage.copyAsFormXObject(pdf);
  33.         //Original page size
  34.         Rectangle orig = origPage.getPageSize();
  35.         //Tile size
  36.         Rectangle tileSize = PageSize.A4.rotate();
  37.         // Transformation matrix
  38.         AffineTransform transformationMatrix = AffineTransform.getScaleInstance(tileSize.getWidth() / orig.getWidth() * 2f, tileSize.getHeight() / orig.getHeight() * 2f);
  40.         //The first tile
  41.         PdfPage page = pdf.addNewPage(PageSize.A4.rotate());
  42.         PdfCanvas canvas = new PdfCanvas(page);
  43.         canvas.concatMatrix(transformationMatrix);
  44.         canvas.addXObject(pageCopy, 0, -orig.getHeight() / 2f);
  46.         //The second tile
  47.         page = pdf.addNewPage(PageSize.A4.rotate());
  48.         canvas = new PdfCanvas(page);
  49.         canvas.concatMatrix(transformationMatrix);
  50.         canvas.addXObject(pageCopy, -orig.getWidth() / 2f, -orig.getHeight() / 2f);
  52.         //The third tile
  53.         page = pdf.addNewPage(PageSize.A4.rotate());
  54.         canvas = new PdfCanvas(page);
  55.         canvas.concatMatrix(transformationMatrix);
  56.         canvas.addXObject(pageCopy, 0, 0);
  58.         //The fourth tile
  59.         page = pdf.addNewPage(PageSize.A4.rotate());
  60.         canvas = new PdfCanvas(page);
  61.         canvas.concatMatrix(transformationMatrix);
  62.         canvas.addXObject(pageCopy, -orig.getWidth() / 2f, 0);
  64.         pdf.close();
  65.         sourcePdf.close();
  66.     }
  67. }

例子3：聚集PDF

我们读取一个带有图片的PDF文档，读取第一页的内容，然后在新的文档的第一页中显示4份同样的内容，代码如下：

  1. import com.itextpdf.kernel.geom.AffineTransform;
  2. import com.itextpdf.kernel.geom.PageSize;
  3. import com.itextpdf.kernel.geom.Rectangle;
  4. import com.itextpdf.kernel.pdf.PdfDocument;
  5. import com.itextpdf.kernel.pdf.PdfPage;
  6. import com.itextpdf.kernel.pdf.PdfReader;
  7. import com.itextpdf.kernel.pdf.PdfWriter;
  8. import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
  9. import com.itextpdf.kernel.pdf.xobject.PdfFormXObject;
  11. import java.io.File;
  12. import java.io.IOException;
  14. public class C06E03_TheGoldenGateBridge_N_up {
  15.     public static final String SRC = "src/main/resources/pdf/the_golden_gate_bridge.pdf";
  16.     public static final String DEST = "results/chapter06/the_golden_gate_bridge_nup.pdf";
  18.     public static void main(String args[]) throws IOException {
  19.         File file = new File(DEST);
  20.         file.getParentFile().mkdirs();
  21.         new C06E03_TheGoldenGateBridge_N_up().createPdf(DEST);
  22.     }
  24.     public void createPdf(String dest) throws IOException {
  25.         //Initialize PDF document
  26.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  27.         PdfDocument sourcePdf = new PdfDocument(new PdfReader(SRC));
  29.         //Original page
  30.         PdfPage origPage = sourcePdf.getPage(1);
  32.         //Original page size
  33.         Rectangle orig = origPage.getPageSize();
  34.         PdfFormXObject pageCopy = origPage.copyAsFormXObject(pdf);
  36.         //N-up page
  37.         PageSize nUpPageSize = PageSize.A4.rotate();
  38.         PdfPage page = pdf.addNewPage(nUpPageSize);
  39.         PdfCanvas canvas = new PdfCanvas(page);
  41.         //Scale page
  42.         AffineTransform transformationMatrix = AffineTransform.getScaleInstance(nUpPageSize.getWidth() / orig.getWidth() / 2f, nUpPageSize.getHeight() / orig.getHeight() / 2f);
  43.         canvas.concatMatrix(transformationMatrix);
  45.         //Add pages to N-up page
  46.         canvas.addXObject(pageCopy, 0, orig.getHeight());
  47.         canvas.addXObject(pageCopy, orig.getWidth(), orig.getHeight());
  48.         canvas.addXObject(pageCopy, 0, 0);
  49.         canvas.addXObject(pageCopy, orig.getWidth(), 0);
  51.         pdf.close();
  52.         sourcePdf.close();
  53.     }
  54. }

例子4：组合PDF_组合全部页面

我们读取两个PDF文件，把两个PDF文件拼接起来，代码如下：

  1. import com.itextpdf.kernel.pdf.*;
  2. import com.itextpdf.kernel.utils.PdfMerger;
  4. import java.io.File;
  5. import java.io.IOException;
  7. public class C06E04_88th_Oscar_Combine {
  8.     public static final String SRC1 = "src/main/resources/pdf/88th_reminder_list.pdf";
  9.     public static final String SRC2 = "src/main/resources/pdf/88th_noms_announcement.pdf";
  10.     public static final String DEST = "results/chapter06/88th_oscar_combined_documents.pdf";
  12.     public static void main(String args[]) throws IOException {
  13.         File file = new File(DEST);
  14.         file.getParentFile().mkdirs();
  15.         new C06E04_88th_Oscar_Combine().createPdf(DEST);
  16.     }
  18.     public void createPdf(String dest) throws IOException {
  19.         //Initialize PDF document with output intent
  20.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  21.         PdfMerger merger = new PdfMerger(pdf);
  23.         //Add pages from the first document
  24.         PdfDocument firstSourcePdf = new PdfDocument(new PdfReader(SRC1));
  25.         merger.merge(firstSourcePdf, 1, firstSourcePdf.getNumberOfPages());
  27.         //Add pages from the second pdf document
  28.         PdfDocument secondSourcePdf = new PdfDocument(new PdfReader(SRC2));
  29.         merger.merge(secondSourcePdf, 1, secondSourcePdf.getNumberOfPages());
  31.         firstSourcePdf.close();
  32.         secondSourcePdf.close();
  33.         pdf.close();
  34.     }
  35. }

例子5：组合PDF_组合特定页面

我们读取两个PDF文件，把两个PDF文件的特定页面拼接起来，代码如下：

  1. import com.itextpdf.kernel.pdf.PdfDocument;
  2. import com.itextpdf.kernel.pdf.PdfReader;
  3. import com.itextpdf.kernel.pdf.PdfWriter;
  4. import com.itextpdf.kernel.utils.PdfMerger;
  6. import java.io.File;
  7. import java.io.IOException;
  8. import java.util.Arrays;
  10. public class C06E05_88th_Oscar_CombineXofY {
  11.     public static final String SRC1 = "src/main/resources/pdf/88th_reminder_list.pdf";
  12.     public static final String SRC2 = "src/main/resources/pdf/88th_noms_announcement.pdf";
  13.     public static final String DEST = "results/chapter06/88th_oscar_combined_documents_xy_pages.pdf";
  15.     public static void main(String args[]) throws IOException {
  16.         File file = new File(DEST);
  17.         file.getParentFile().mkdirs();
  18.         new C06E05_88th_Oscar_CombineXofY().createPdf(DEST);
  19.     }
  21.     public void createPdf(String dest) throws IOException {
  22.         //Initialize PDF document with output intent
  23.         PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
  25.         PdfMerger merger = new PdfMerger(pdf);
  27.         //Add pages from the first document
  28.         PdfDocument firstSourcePdf = new PdfDocument(new PdfReader(SRC1));
  29.         merger.merge(firstSourcePdf, Arrays.asList(1, 5, 7, 1));
  31.         //Add pages from the second pdf document
  32.         PdfDocument secondSourcePdf = new PdfDocument(new PdfReader(SRC2));
  33.         merger.merge(secondSourcePdf, Arrays.asList(1, 15));
  35.         firstSourcePdf.close();
  36.         secondSourcePdf.close();
  37.         pdf.close();
  38.     }
  39. }

例子6：组合文档并添加目录

我们读取两个PDF文件，把两个PDF文件的特定页面拼接起来，并添加目录，代码如下：

  1. import com.itextpdf.kernel.color.Color;
  2. import com.itextpdf.kernel.pdf.*;
  3. import com.itextpdf.kernel.pdf.action.PdfAction;
  4. import com.itextpdf.kernel.pdf.canvas.draw.DottedLine;
  5. import com.itextpdf.layout.Document;
  6. import com.itextpdf.layout.property.Property;
  7. import com.itextpdf.layout.element.Paragraph;
  8. import com.itextpdf.layout.element.Tab;
  9. import com.itextpdf.layout.element.TabStop;
  10. import com.itextpdf.layout.element.Text;
  11. import com.itextpdf.layout.property.TabAlignment;
  12. import com.itextpdf.layout.property.TextAlignment;
  14. import java.io.File;
  15. import java.io.IOException;
  16. import java.util.*;
  18. public class C06E06_88th_Oscar_Combine_AddTOC {
  19.     public static final String SRC1 = "src/main/resources/pdf/88th_noms_announcement.pdf";
  20.     public static final String SRC2 = "src/main/resources/pdf/oscars_movies_checklist_2016.pdf";
  21.     public static final String DEST = "results/chapter06/88th_oscar_the_revenant_nominations_TOC.pdf";
  23.     public static final Map<String, Integer> TheRevenantNominations = new TreeMap<String, Integer>();
  24.     static {
  25.         TheRevenantNominations.put("Performance by an actor in a leading role", 4);
  26.         TheRevenantNominations.put("Performance by an actor in a supporting role", 4);
  27.         TheRevenantNominations.put("Achievement in cinematography", 4);
  28.         TheRevenantNominations.put("Achievement in costume design", 5);
  29.         TheRevenantNominations.put("Achievement in directing", 5);
  30.         TheRevenantNominations.put("Achievement in film editing", 6);
  31.         TheRevenantNominations.put("Achievement in makeup and hairstyling", 7);
  32.         TheRevenantNominations.put("Best motion picture of the year", 8);
  33.         TheRevenantNominations.put("Achievement in production design", 8);
  34.         TheRevenantNominations.put("Achievement in sound editing", 9);
  35.         TheRevenantNominations.put("Achievement in sound mixing", 9);
  36.         TheRevenantNominations.put("Achievement in visual effects", 10);
  37.     }
  39.     public static void main(String args[]) throws IOException {
  40.         File file = new File(DEST);
  41.         file.getParentFile().mkdirs();
  42.         new C06E06_88th_Oscar_Combine_AddTOC().createPdf(DEST);
  43.     }
  45.     public void createPdf(String dest) throws IOException {
  46.         PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
  47.         Document document = new Document(pdfDoc);
  48.         document.add(new Paragraph(new Text("The Revenant nominations list"))
  49.                 .setTextAlignment(TextAlignment.CENTER));
  51.         PdfDocument firstSourcePdf = new PdfDocument(new PdfReader(SRC1));
  52.         for (Map.Entry<String, Integer> entry : TheRevenantNominations.entrySet()) {
  53.             //Copy page
  54.             PdfPage page  = firstSourcePdf.getPage(entry.getValue()).copyTo(pdfDoc);
  55.             pdfDoc.addPage(page);
  57.             //Overwrite page number
  58.             Text text = new Text(String.format("Page %d", pdfDoc.getNumberOfPages() - 1));
  59.             text.setBackgroundColor(Color.WHITE);
  60.             document.add(new Paragraph(text).setFixedPosition(
  61.                     pdfDoc.getNumberOfPages(), 549, 742, 100));
  63.             //Add destination
  64.             String destinationKey = "p" + (pdfDoc.getNumberOfPages() - 1);
  65.             PdfArray destinationArray = new PdfArray();
  66.             destinationArray.add(page.getPdfObject());
  67.             destinationArray.add(PdfName.XYZ);
  68.             destinationArray.add(new PdfNumber(0));
  69.             destinationArray.add(new PdfNumber(page.getMediaBox().getHeight()));
  70.             destinationArray.add(new PdfNumber(1));
  71.             pdfDoc.addNamedDestination(destinationKey, destinationArray);
  73.             //Add TOC line with bookmark
  74.             Paragraph p = new Paragraph();
  75.             p.addTabStops(new TabStop(540, TabAlignment.RIGHT, new DottedLine()));
  76.             p.add(entry.getKey());
  77.             p.add(new Tab());
  78.             p.add(String.valueOf(pdfDoc.getNumberOfPages() - 1));
  79.             p.setProperty(Property.ACTION, PdfAction.createGoTo(destinationKey));
  80.             document.add(p);
  81.         }
  82.         firstSourcePdf.close();
  84.         //Add the last page
  85.         PdfDocument secondSourcePdf = new PdfDocument(new PdfReader(SRC2));
  86.         PdfPage page  = secondSourcePdf.getPage(1).copyTo(pdfDoc);
  87.         pdfDoc.addPage(page);
  89.         //Add destination
  90.         PdfArray destinationArray = new PdfArray();
  91.         destinationArray.add(page.getPdfObject());
  92.         destinationArray.add(PdfName.XYZ);
  93.         destinationArray.add(new PdfNumber(0));
  94.         destinationArray.add(new PdfNumber(page.getMediaBox().getHeight()));
  95.         destinationArray.add(new PdfNumber(1));
  96.         pdfDoc.addNamedDestination("checklist", destinationArray);
  98.         //Add TOC line with bookmark
  99.         Paragraph p = new Paragraph();
  100.         p.addTabStops(new TabStop(540, TabAlignment.RIGHT, new DottedLine()));
  101.         p.add("Oscars\u00ae 2016 Movie Checklist");
  102.         p.add(new Tab());
  103.         p.add(String.valueOf(pdfDoc.getNumberOfPages() - 1));
  104.         p.setProperty(Property.ACTION, PdfAction.createGoTo("checklist"));
  105.         document.add(p);
  106.         secondSourcePdf.close();
  108.         // close the document
  109.         document.close();
  110.     }
  111. }

例子7：拼接表单

我们读取带有表单两个PDF文件，把两个PDF文件拼接起来，代码如下：

  1. import com.itextpdf.forms.PdfPageFormCopier;
  2. import com.itextpdf.kernel.pdf.*;
  4. import java.io.File;
  5. import java.io.IOException;
  7. public class C06E07_Combine_Forms {
  8.     public static final String DEST = "results/chapter06/combined_forms.pdf";
  9.     public static final String SRC1 = "src/main/resources/pdf/subscribe.pdf";
  10.     public static final String SRC2 = "src/main/resources/pdf/state.pdf";
  12.     public static void main(String args[]) throws IOException {
  13.         File file = new File(DEST);
  14.         file.getParentFile().mkdirs();
  15.         new C06E07_Combine_Forms().createPdf(DEST);
  16.     }
  18.     public void createPdf(String dest) throws IOException {
  19.         PdfDocument destPdfDocument = new PdfDocument(new PdfWriter(dest));
  20.         PdfDocument[] sources = new PdfDocument[] {
  21.                 new PdfDocument(new PdfReader(SRC1)),
  22.                 new PdfDocument(new PdfReader(SRC2))
  23.         };
  24.         PdfPageFormCopier formCopier = new PdfPageFormCopier();
  25.         for (PdfDocument sourcePdfDocument : sources) {
  26.             sourcePdfDocument.copyPagesTo(
  27.                     1, sourcePdfDocument.getNumberOfPages(),
  28.                     destPdfDocument, formCopier);
  29.             sourcePdfDocument.close();
  30.         }
  31.         destPdfDocument.close();
  32.     }
  33. }

例子8：填充并拼接表单

我们读取带有表单的PDF文件，读取CSV，填充表单，拼接多个表单，代码如下：

  1. import com.itextpdf.forms.PdfAcroForm;
  2. import com.itextpdf.forms.PdfPageFormCopier;
  3. import com.itextpdf.forms.fields.PdfFormField;
  4. import com.itextpdf.io.source.ByteArrayOutputStream;
  5. import com.itextpdf.kernel.pdf.PdfDocument;
  6. import com.itextpdf.kernel.pdf.PdfReader;
  7. import com.itextpdf.kernel.pdf.PdfWriter;
  9. import java.io.*;
  10. import java.util.Map;
  11. import java.util.StringTokenizer;
  13. public class C06E08_FillOutAndMergeForms {
  14.     public static final String DEST = "results/chapter06/fill_out_and_merge_forms.pdf";
  15.     public static final String SRC = "src/main/resources/pdf/state.pdf";
  16.     public static final String DATA = "src/main/resources/data/united_states.csv";
  18.     public static void main(String args[]) throws IOException {
  19.         File file = new File(DEST);
  20.         file.getParentFile().mkdirs();
  21.         new C06E08_FillOutAndMergeForms().createPdf(DEST);
  22.     }
  24.     public void createPdf(String dest) throws IOException {
  25.         PdfDocument pdfDocument = new PdfDocument(new PdfWriter(dest));
  26.         PdfPageFormCopier formCopier = new PdfPageFormCopier();
  28.         BufferedReader bufferedReader = new BufferedReader(new FileReader(DATA));
  29.         String line;
  30.         boolean headerLine = true;
  31.         int i = 1;
  32.         while ((line = bufferedReader.readLine()) != null) {
  33.             if (headerLine) {
  34.                 headerLine = false;
  35.                 continue;
  36.             }
  38.             ByteArrayOutputStream baos = new ByteArrayOutputStream();
  39.             PdfDocument sourcePdfDocument = new PdfDocument(new PdfReader(SRC), new PdfWriter(baos));
  41.             //Rename fields
  42.             i++;
  43.             PdfAcroForm form = PdfAcroForm.getAcroForm(sourcePdfDocument, true);
  44.             form.renameField("name", "name_" + i);
  45.             form.renameField("abbr", "abbr_" + i);
  46.             form.renameField("capital", "capital_" + i);
  47.             form.renameField("city", "city_" + i);
  48.             form.renameField("population", "population_" + i);
  49.             form.renameField("surface", "surface_" + i);
  50.             form.renameField("timezone1", "timezone1_" + i);
  51.             form.renameField("timezone2", "timezone2_" + i);
  52.             form.renameField("dst", "dst_" + i);
  54.             //Fill out fields
  55.             StringTokenizer tokenizer = new StringTokenizer(line, ";");
  56.             Map<String, PdfFormField> fields = form.getFormFields();
  57.             fields.get("name_" + i).setValue(tokenizer.nextToken());
  58.             fields.get("abbr_" + i).setValue(tokenizer.nextToken());
  59.             fields.get("capital_" + i).setValue(tokenizer.nextToken());
  60.             fields.get("city_" + i).setValue(tokenizer.nextToken());
  61.             fields.get("population_" + i).setValue(tokenizer.nextToken());
  62.             fields.get("surface_" + i).setValue(tokenizer.nextToken());
  63.             fields.get("timezone1_" + i).setValue(tokenizer.nextToken());
  64.             fields.get("timezone2_" + i).setValue(tokenizer.nextToken());
  65.             fields.get("dst_" + i).setValue(tokenizer.nextToken());
  67.             sourcePdfDocument.close();
  68.             sourcePdfDocument = new PdfDocument(new PdfReader(new ByteArrayInputStream(baos.toByteArray())));
  70.             //Copy pages
  71.             sourcePdfDocument.copyPagesTo(1, sourcePdfDocument.getNumberOfPages(), pdfDocument, formCopier);
  72.             sourcePdfDocument.close();
  73.         }
  75.         bufferedReader.close();
  76.         pdfDocument.close();
  77.     }
  78. }

例子9：填充、锁定并拼接表单

我们读取带有表单的PDF文件，读取CSV，填充表单，锁定表单，最后拼接多个表单，代码如下：

  1. import com.itextpdf.forms.PdfAcroForm;
  2. import com.itextpdf.forms.fields.PdfFormField;
  3. import com.itextpdf.io.source.ByteArrayOutputStream;
  4. import com.itextpdf.kernel.pdf.PdfDocument;
  5. import com.itextpdf.kernel.pdf.PdfReader;
  6. import com.itextpdf.kernel.pdf.PdfWriter;
  8. import java.io.*;
  9. import java.util.Map;
  10. import java.util.StringTokenizer;
  12. public class C06E09_FillOutFlattenAndMergeForms {
  13.     public static final String DEST1 = "results/chapter06/fill_out_flatten_forms_merge.pdf";
  14.     public static final String DEST2 = "results/chapter06/fill_out_flatten_forms_smart_merge.pdf";
  15.     public static final String SRC = "src/main/resources/pdf/state.pdf";
  16.     public static final String DATA = "src/main/resources/data/united_states.csv";
  18.     public static void main(String args[]) throws IOException {
  19.         File file = new File(DEST1);
  20.         file.getParentFile().mkdirs();
  21.         file = new File(DEST2);
  22.         file.getParentFile().mkdirs();
  23.         new C06E09_FillOutFlattenAndMergeForms().createPdf(DEST1, DEST2);
  24.     }
  26.     public void createPdf(String dest1, String dest2) throws IOException {
  27.         PdfDocument destPdfDocument = new PdfDocument(new PdfWriter(dest1));
  28.         //Smart mode
  29.         PdfDocument destPdfDocumentSmartMode = new PdfDocument(new PdfWriter(dest2).setSmartMode(true));
  31.         BufferedReader bufferedReader = new BufferedReader(new FileReader(DATA));
  32.         String line;
  33.         boolean headerLine = true;
  34.         while ((line = bufferedReader.readLine()) != null) {
  35.             if (headerLine) {
  36.                 headerLine = false;
  37.                 continue;
  38.             }
  39.             ByteArrayOutputStream baos = new ByteArrayOutputStream();
  40.             PdfDocument sourcePdfDocument = new PdfDocument(new PdfReader(SRC), new PdfWriter(baos));
  42.             //Read fields
  43.             PdfAcroForm form = PdfAcroForm.getAcroForm(sourcePdfDocument, true);
  44.             StringTokenizer tokenizer = new StringTokenizer(line, ";");
  45.             Map<String, PdfFormField> fields = form.getFormFields();
  47.             //Fill out fields
  48.             fields.get("name").setValue(tokenizer.nextToken());
  49.             fields.get("abbr").setValue(tokenizer.nextToken());
  50.             fields.get("capital").setValue(tokenizer.nextToken());
  51.             fields.get("city").setValue(tokenizer.nextToken());
  52.             fields.get("population").setValue(tokenizer.nextToken());
  53.             fields.get("surface").setValue(tokenizer.nextToken());
  54.             fields.get("timezone1").setValue(tokenizer.nextToken());
  55.             fields.get("timezone2").setValue(tokenizer.nextToken());
  56.             fields.get("dst").setValue(tokenizer.nextToken());
  58.             //Flatten fields
  59.             form.flattenFields();
  61.             sourcePdfDocument.close();
  62.             sourcePdfDocument = new PdfDocument(new PdfReader(new ByteArrayInputStream(baos.toByteArray())));
  64.             //Copy pages
  65.             sourcePdfDocument.copyPagesTo(1, sourcePdfDocument.getNumberOfPages(), destPdfDocument, null);
  66.             sourcePdfDocument.copyPagesTo(1, sourcePdfDocument.getNumberOfPages(), destPdfDocumentSmartMode, null);
  68.             sourcePdfDocument.close();
  69.         }
  71.         bufferedReader.close();
  73.         destPdfDocument.close();
  74.         destPdfDocumentSmartMode.close();
  75.     }
  76. }

Example代码下载

本章代码可在如下地址下载（IDEA工程）：iText7——第六章源代码工程

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/78745027

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