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7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7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：创建PDF/UA文档

在第一章里面的fox和dog赛跑的基础上，我们创建PDF/UA标准的文档，代码如下：

  1. import com.itextpdf.kernel.pdf.*;
  2. import com.itextpdf.kernel.utils.PdfMerger;
  3. import com.itextpdf.pdfa.PdfADocument;
  5. import java.io.File;
  6. import java.io.FileInputStream;
  7. import java.io.IOException;
  9. public class C07E04_MergePDFADocuments {
  10.     public static final String INTENT = "src/main/resources/color/sRGB_CS_profile.icm";
  12.     public static final String SRC1 = "src/main/resources/pdf/quick_brown_fox_PDFA-1a.pdf";
  13.     public static final String SRC2 = "src/main/resources/pdf/united_states_PDFA-1a.pdf";
  14.     public static final String DEST = "results/chapter07/merged_PDFA-1a_documents.pdf";
  16.     public static void main(String args[]) throws IOException {
  17.         File file = new File(DEST);
  18.         file.getParentFile().mkdirs();
  19.         new C07E04_MergePDFADocuments().createPdf(DEST);
  20.     }
  22.     public void createPdf(String dest) throws IOException {
  23.         //Initialize PDFA document with output intent
  24.         PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
  25.                 PdfAConformanceLevel.PDF_A_1A,
  26.                 new PdfOutputIntent("Custom", "", "http://www.color.org",
  27.                         "sRGB IEC61966-2.1", new FileInputStream(INTENT)));
  29.         //Setting some required parameters
  30.         pdf.setTagged();
  31.         pdf.getCatalog().setLang(new PdfString("en-US"));
  32.         pdf.getCatalog().setViewerPreferences(
  33.                 new PdfViewerPreferences().setDisplayDocTitle(true));
  34.         PdfDocumentInfo info = pdf.getDocumentInfo();
  35.         info.setTitle("iText7 PDF/A-1a example");
  37.         //Create PdfMerger instance
  38.         PdfMerger merger = new PdfMerger(pdf);
  39.         //Add pages from the first document
  40.         PdfDocument firstSourcePdf = new PdfDocument(new PdfReader(SRC1));
  41.         merger.merge(firstSourcePdf, 1, firstSourcePdf.getNumberOfPages());
  42.         //Add pages from the second pdf document
  43.         PdfDocument secondSourcePdf = new PdfDocument(new PdfReader(SRC2));
  44.         merger.merge(secondSourcePdf, 1, secondSourcePdf.getNumberOfPages());
  46.         //Close the documents
  47.         firstSourcePdf.close();
  48.         secondSourcePdf.close();
  49.         pdf.close();
  50.     }
  51. }

例子2：创建PDF/A-1b文档

PDF/A-1是ISO 19005的一部分，同时也有a和b之分，我们创建PDF/A-1b标准的文档，代码如下：

  1. import com.itextpdf.io.font.PdfEncodings;
  2. import com.itextpdf.io.image.ImageDataFactory;
  3. import com.itextpdf.kernel.font.PdfFont;
  4. import com.itextpdf.kernel.font.PdfFontFactory;
  5. import com.itextpdf.kernel.pdf.PdfAConformanceLevel;
  6. import com.itextpdf.kernel.pdf.PdfOutputIntent;
  7. import com.itextpdf.kernel.pdf.PdfWriter;
  8. import com.itextpdf.layout.Document;
  9. import com.itextpdf.layout.element.Image;
  10. import com.itextpdf.layout.element.Paragraph;
  11. import com.itextpdf.layout.element.Text;
  12. import com.itextpdf.pdfa.PdfADocument;
  14. import java.io.File;
  15. import java.io.FileInputStream;
  16. import java.io.IOException;
  18. public class C07E02_QuickBrownFox_PDFA_1b {
  19.     public static final String DOG = "src/main/resources/img/dog.bmp";
  20.     public static final String FOX = "src/main/resources/img/fox.bmp";
  21.     public static final String FONT = "src/main/resources/font/FreeSans.ttf";
  22.     public static final String INTENT = "src/main/resources/color/sRGB_CS_profile.icm";
  24.     public static final String DEST = "results/chapter07/quick_brown_fox_PDFA-1b.pdf";
  26.     public static void main(String args[]) throws IOException {
  27.         File file = new File(DEST);
  28.         file.getParentFile().mkdirs();
  29.         new C07E02_QuickBrownFox_PDFA_1b().createPdf(DEST);
  30.     }
  32.     public void createPdf(String dest) throws IOException {
  33.         //Initialize PDFA document with output intent
  34.         PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
  35.                 PdfAConformanceLevel.PDF_A_1B,
  36.                 new PdfOutputIntent("Custom", "", "http://www.color.org",
  37.                         "sRGB IEC61966-2.1", new FileInputStream(INTENT)));
  38.         Document document = new Document(pdf);
  40.         //Fonts need to be embedded
  41.         PdfFont font = PdfFontFactory.createFont(FONT, PdfEncodings.WINANSI, true);
  42.         Paragraph p = new Paragraph();
  43.         p.setFont(font);
  44.         p.add(new Text("The quick brown "));
  45.         Image foxImage = new Image(ImageDataFactory.create(FOX));
  46.         p.add(foxImage);
  47.         p.add(" jumps over the lazy ");
  48.         Image dogImage = new Image(ImageDataFactory.create(DOG));
  49.         p.add(dogImage);
  51.         document.add(p);
  52.         document.close();
  53.     }
  54. }

例子3：创建PDF/A-1a文档

PDF/A-1是ISO 19005的一部分，同时也有a和b之分，我们创建PDF/A-1a标准的文档，代码如下：

  1. import  com.itextpdf.io.font.PdfEncodings;
  2. import com.itextpdf.io.image.ImageDataFactory;
  3. import com.itextpdf.kernel.font.PdfFont;
  4. import com.itextpdf.kernel.font.PdfFontFactory;
  5. import com.itextpdf.kernel.pdf.PdfAConformanceLevel;
  6. import com.itextpdf.kernel.pdf.PdfOutputIntent;
  7. import com.itextpdf.kernel.pdf.PdfWriter;
  8. import com.itextpdf.layout.Document;
  9. import com.itextpdf.layout.element.Image;
  10. import com.itextpdf.layout.element.Paragraph;
  11. import com.itextpdf.layout.element.Text;
  12. import com.itextpdf.pdfa.PdfADocument;
  14. import java.io.File;
  15. import java.io.FileInputStream;
  16. import java.io.IOException;
  18. public class C07E02_QuickBrownFox_PDFA_1a {
  19.     public static final String DOG = "src/main/resources/img/dog.bmp";
  20.     public static final String FOX = "src/main/resources/img/fox.bmp";
  21.     public static final String FONT = "src/main/resources/font/FreeSans.ttf";
  22.     public static final String INTENT = "src/main/resources/color/sRGB_CS_profile.icm";
  24.     public static final String DEST = "results/chapter07/quick_brown_fox_PDFA-1a.pdf";
  26.     public static void main(String args[]) throws IOException {
  27.         File file = new File(DEST);
  28.         file.getParentFile().mkdirs();
  29.         new C07E02_QuickBrownFox_PDFA_1a().createPdf(DEST);
  30.     }
  32.     public void createPdf(String dest) throws IOException {
  33.         //Initialize PDFA document with output intent
  34.         PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
  35.                 PdfAConformanceLevel.PDF_A_1A,
  36.                 new PdfOutputIntent("Custom", "", "http://www.color.org",
  37.                         "sRGB IEC61966-2.1", new FileInputStream(INTENT)));
  38.         Document document = new Document(pdf);
  40.         //Setting some required parameters
  41.         pdf.setTagged();
  43.         //Fonts need to be embedded
  44.         PdfFont font = PdfFontFactory.createFont(FONT, PdfEncodings.WINANSI, true);
  45.         Paragraph p = new Paragraph();
  46.         p.setFont(font);
  47.         p.add(new Text("The quick brown "));
  48.         Image foxImage = new Image(ImageDataFactory.create(FOX));
  49.         //Set alt text
  50.         foxImage.getAccessibilityProperties().setAlternateDescription("Fox");
  51.         p.add(foxImage);
  52.         p.add(" jumps over the lazy ");
  53.         Image dogImage = new Image(ImageDataFactory.create(DOG));
  54.         //Set alt text
  55.         dogImage.getAccessibilityProperties().setAlternateDescription("Dog");
  56.         p.add(dogImage);
  58.         document.add(p);
  59.         document.close();
  60.     }
  61. }

例子4：创建PDF/A-1a文档

PDF/A-2和PDF/A-3是ISO 19005的增强部分，3比2对附件没有格式限制，我们创建PDF/A-3a标准的文档，代码如下：

  1. import com.itextpdf.kernel.font.PdfFont;
  2. import com.itextpdf.kernel.font.PdfFontFactory;
  3. import com.itextpdf.kernel.geom.PageSize;
  4. import com.itextpdf.kernel.pdf.*;
  5. import com.itextpdf.kernel.pdf.filespec.PdfFileSpec;
  6. import com.itextpdf.layout.Document;
  7. import com.itextpdf.layout.property.HorizontalAlignment;
  8. import com.itextpdf.layout.element.Cell;
  9. import com.itextpdf.layout.element.Paragraph;
  10. import com.itextpdf.layout.element.Table;
  11. import com.itextpdf.pdfa.PdfADocument;
  13. import java.io.*;
  14. import java.nio.file.Files;
  15. import java.nio.file.Paths;
  16. import java.util.StringTokenizer;
  18. public class C07E03_UnitedStates_PDFA_3a {
  19.     public static final String DATA = "src/main/resources/data/united_states.csv";
  20.     public static final String FONT = "src/main/resources/font/FreeSans.ttf";
  21.     public static final String BOLD_FONT = "src/main/resources/font/FreeSansBold.ttf";
  22.     public static final String INTENT = "src/main/resources/color/sRGB_CS_profile.icm";
  24.     public static final String DEST = "results/chapter07/united_states_PDFA-3a.pdf";
  26.     public static void main(String args[]) throws IOException {
  27.         File file = new File(DEST);
  28.         file.getParentFile().mkdirs();
  29.         new C07E03_UnitedStates_PDFA_3a().createPdf(DEST);
  30.     }
  32.     public void createPdf(String dest) throws IOException {
  33.         PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
  34.                 PdfAConformanceLevel.PDF_A_3A,
  35.                 new PdfOutputIntent("Custom", "", "http://www.color.org",
  36.                         "sRGB IEC61966-2.1", new FileInputStream(INTENT)));
  37.         Document document = new Document(pdf, PageSize.A4.rotate());
  38.         document.setMargins(20, 20, 20, 20);
  40.         //Setting some required parameters
  41.         pdf.setTagged();
  42.         pdf.getCatalog().setLang(new PdfString("en-US"));
  43.         pdf.getCatalog().setViewerPreferences(
  44.                 new PdfViewerPreferences().setDisplayDocTitle(true));
  45.         PdfDocumentInfo info = pdf.getDocumentInfo();
  46.         info.setTitle("iText7 PDF/A-3 example");
  48.         //Add attachment
  49.         PdfDictionary parameters = new PdfDictionary();
  50.         parameters.put(PdfName.ModDate, new PdfDate().getPdfObject());
  51.         PdfFileSpec fileSpec = PdfFileSpec.createEmbeddedFileSpec(
  52.                 pdf, Files.readAllBytes(Paths.get(DATA)), "united_states.csv",
  53.                 "united_states.csv", new PdfName("text/csv"), parameters,
  54.                 PdfName.Data, false);
  55.         fileSpec.put(new PdfName("AFRelationship"), new PdfName("Data"));
  56.         pdf.addFileAttachment("united_states.csv", fileSpec);
  57.         PdfArray array = new PdfArray();
  58.         array.add(fileSpec.getPdfObject().getIndirectReference());
  59.         pdf.getCatalog().put(new PdfName("AF"), array);
  61.         //Embed fonts
  62.         PdfFont font = PdfFontFactory.createFont(FONT, true);
  63.         PdfFont bold = PdfFontFactory.createFont(BOLD_FONT, true);
  65.         // Create content
  66.         Table table = new Table(new float[]{4, 1, 3, 4, 3, 3, 3, 3, 1});
  67.         table.setWidthPercent(100);
  68.         BufferedReader br = new BufferedReader(new FileReader(DATA));
  69.         String line = br.readLine();
  70.         process(table, line, bold, true);
  71.         while ((line = br.readLine()) != null) {
  72.             process(table, line, font, false);
  73.         }
  74.         br.close();
  75.         document.add(table);
  77.         //Close document
  78.         document.close();
  79.     }
  81.     public void process(Table table, String line, PdfFont font, boolean isHeader) {
  82.         StringTokenizer tokenizer = new StringTokenizer(line, ";");
  83.         while (tokenizer.hasMoreTokens()) {
  84.             if (isHeader) {
  85.                 table.addHeaderCell(new Cell().setHorizontalAlignment(HorizontalAlignment.CENTER).add(new Paragraph(tokenizer.nextToken()).setHorizontalAlignment(HorizontalAlignment.CENTER).setFont(font)));
  86.             } else {
  87.                 table.addCell(new Cell().setHorizontalAlignment(HorizontalAlignment.CENTER).add(new Paragraph(tokenizer.nextToken()).setHorizontalAlignment(HorizontalAlignment.CENTER).setFont(font)));
  88.             }
  89.         }
  90.     }
  91. }

例子5：拼接PDF/A文档

当拼接PDF/A文件的时候，最值得我们注意的是，我们拼接的各个文档必须都是PDF/A文件。在这里，我们把两个PDF/A-1A的文档拼接起来，代码如下：

  1. import com.itextpdf.kernel.pdf.*;
  2. import com.itextpdf.kernel.utils.PdfMerger;
  3. import com.itextpdf.pdfa.PdfADocument;
  5. import java.io.File;
  6. import java.io.FileInputStream;
  7. import java.io.IOException;
  9. public class C07E04_MergePDFADocuments {
  10.     public static final String INTENT = "src/main/resources/color/sRGB_CS_profile.icm";
  12.     public static final String SRC1 = "src/main/resources/pdf/quick_brown_fox_PDFA-1a.pdf";
  13.     public static final String SRC2 = "src/main/resources/pdf/united_states_PDFA-1a.pdf";
  14.     public static final String DEST = "results/chapter07/merged_PDFA-1a_documents.pdf";
  16.     public static void main(String args[]) throws IOException {
  17.         File file = new File(DEST);
  18.         file.getParentFile().mkdirs();
  19.         new C07E04_MergePDFADocuments().createPdf(DEST);
  20.     }
  22.     public void createPdf(String dest) throws IOException {
  23.         //Initialize PDFA document with output intent
  24.         PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
  25.                 PdfAConformanceLevel.PDF_A_1A,
  26.                 new PdfOutputIntent("Custom", "", "http://www.color.org",
  27.                         "sRGB IEC61966-2.1", new FileInputStream(INTENT)));
  29.         //Setting some required parameters
  30.         pdf.setTagged();
  31.         pdf.getCatalog().setLang(new PdfString("en-US"));
  32.         pdf.getCatalog().setViewerPreferences(
  33.                 new PdfViewerPreferences().setDisplayDocTitle(true));
  34.         PdfDocumentInfo info = pdf.getDocumentInfo();
  35.         info.setTitle("iText7 PDF/A-1a example");
  37.         //Create PdfMerger instance
  38.         PdfMerger merger = new PdfMerger(pdf);
  39.         //Add pages from the first document
  40.         PdfDocument firstSourcePdf = new PdfDocument(new PdfReader(SRC1));
  41.         merger.merge(firstSourcePdf, 1, firstSourcePdf.getNumberOfPages());
  42.         //Add pages from the second pdf document
  43.         PdfDocument secondSourcePdf = new PdfDocument(new PdfReader(SRC2));
  44.         merger.merge(secondSourcePdf, 1, secondSourcePdf.getNumberOfPages());
  46.         //Close the documents
  47.         firstSourcePdf.close();
  48.         secondSourcePdf.close();
  49.         pdf.close();
  50.     }
  51. }

Example代码下载

本章代码可在如下地址下载（IDEA工程）：iText7——第七章源代码工程

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/78885790

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