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Java对比PDF文件内容_java 对比pdf

作者：我家自动化 | 2024-07-23 22:31:42

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java 对比pdf

使用 java-diff-utils、pdfbox 完成PDF内容的比较以及差异处的高亮显示

文章仅对PDF文件中的文本内容进行对比，并在差异处高亮显示差异内容。新增文本为绿色、删除为红色。

在 DiffUtil 的 getDiffPdf 方法传入需要对比的文件路径，以及输出的文件路径。

（此工具类仅进行文本内容的对比，无法进行图片的比较，请注意甄别。）

spingboot版本 2.7.1

jdk 1.8

  1. <dependencies>
  2.         <dependency>
  3.             <groupId>org.springframework.boot</groupId>
  4.             <artifactId>spring-boot-starter-web</artifactId>
  5.         </dependency>
  6.  
  7.         <dependency>
  8.             <groupId>io.github.java-diff-utils</groupId>
  9.             <artifactId>java-diff-utils</artifactId>
  10.             <version>4.11</version>
  11.         </dependency>
  12.  
  13.         <dependency>
  14.             <groupId>org.apache.pdfbox</groupId>
  15.             <artifactId>pdfbox</artifactId>
  16.             <version>2.0.29</version>
  17.         </dependency>
  18.  
  19.         <dependency>
  20.             <groupId>org.apache.pdfbox</groupId>
  21.             <artifactId>pdfbox-tools</artifactId>
  22.             <version>2.0.29</version>
  23.         </dependency>
  24.  
  25.         <dependency>
  26.             <groupId>org.apache.pdfbox</groupId>
  27.             <artifactId>fontbox</artifactId>
  28.             <version>2.0.29</version>
  29.         </dependency>
  30.  
  31.         <dependency>
  32.             <groupId>org.apache.pdfbox</groupId>
  33.             <artifactId>xmpbox</artifactId>
  34.             <version>2.0.29</version>
  35.         </dependency>
  36.  
  37.         <dependency>
  38.             <groupId>org.apache.pdfbox</groupId>
  39.             <artifactId>preflight</artifactId>
  40.             <version>2.0.29</version>
  41.         </dependency>
  42.  
  43.         <dependency>
  44.             <groupId>cn.hutool</groupId>
  45.             <artifactId>hutool-all</artifactId>
  46.             <version>5.6.0</version>
  47.         </dependency>
  48.         
  49.     </dependencies>

引入以下三个类即可

工具类DiffUtil

  1. package com.pdf.pdfcomparer.util;
  2.  
  3. import cn.hutool.core.collection.CollUtil;
  4. import com.github.difflib.UnifiedDiffUtils;
  5. import com.github.difflib.patch.Patch;
  6. import com.pdf.pdfcomparer.overide.GetCharLocationAndSize;
  7. import com.pdf.pdfcomparer.overide.LineTextPosition;
  8. import org.apache.pdfbox.pdmodel.PDDocument;
  9. import org.apache.pdfbox.pdmodel.PDPage;
  10. import org.apache.pdfbox.pdmodel.common.PDRectangle;
  11. import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
  12. import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
  13. import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationTextMarkup;
  14.  
  15. import java.io.File;
  16. import java.io.IOException;
  17. import java.io.StringWriter;
  18. import java.util.ArrayList;
  19. import java.util.Arrays;
  20. import java.util.List;
  21. import java.util.stream.Collectors;
  22.  
  23.  
  24. public class DiffUtil {
  25.  
  26.     /**
  27.      * 获取文本对比后的pdf
  28.      * @param oldPdfPath 原pdf文件路径
  29.      * @param newPdfPath 新pdf文件路径
  30.      * @param outputOldPdfPath 原diff文件输出路径
  31.      * @param outputNewPdfPath 新diff文件输出路径
  32.      */
  33.     public static int getDiffPdf(String oldPdfPath, String newPdfPath, String outputOldPdfPath, String outputNewPdfPath) {
  34.         try {
  35.             File file1 = new File(oldPdfPath);
  36.             File file2 = new File(newPdfPath);
  37.             String originalFileName = file1.getName();
  38.             String revisedFileName = file2.getName();
  39.  
  40.             // 构建文本页信息
  41.             List<GetCharLocationAndSize> charLAS1 = buildCharLocationAndSize(file1);
  42.             List<GetCharLocationAndSize> charLAS2 = buildCharLocationAndSize(file2);
  43.             // 获取所有文本详细信息
  44.             List<LineTextPosition> lineTextPositions1 = new ArrayList<>();
  45.             charLAS1.forEach(getCharLocationAndSize -> lineTextPositions1.addAll(getCharLocationAndSize.getLineTextPositions()));
  46.             List<LineTextPosition> lineTextPositions2 = new ArrayList<>();
  47.             charLAS2.forEach(getCharLocationAndSize -> lineTextPositions2.addAll(getCharLocationAndSize.getLineTextPositions()));
  48.             List<String> original = CollUtil.emptyIfNull(lineTextPositions1).stream().map(LineTextPosition::getLineText).collect(Collectors.toList());
  49.             List<String> revised = CollUtil.emptyIfNull(lineTextPositions2).stream().map(LineTextPosition::getLineText).collect(Collectors.toList());
  50.             // 获取差异文本上下文信息
  51.             List<String> unifiedDiff = getUnifiedDiff(originalFileName, original, revisedFileName, revised);
  52.             // 设置文本差异标志
  53.             List<String> signs = CollUtil.emptyIfNull(unifiedDiff).stream().filter(sign -> sign.startsWith("@@")).collect(Collectors.toList());
  54.             if (signs.size() > 0) {
  55.                 signs.forEach(sign -> {
  56.                     if (!sign.equals("@@ -0,0 +0,0 @@")) {
  57.  
  58.                         List<String> split = Arrays.asList(sign.split(" "));
  59.                         // 源文件标识
  60.                         String var1 = split.get(1);
  61.                         String[] var2 = var1.split(",");
  62.                         int start = Integer.parseInt(var2[0].substring(1)) - 1;
  63.                         int end = start + Integer.parseInt(var2[1]);
  64.                         for (int i = start; i < end; i++) {
  65.                             lineTextPositions1.get(i).setType("1");
  66.                         }
  67.  
  68.                         // 新文件标识
  69.                         String var3 = split.get(2);
  70.                         String[] var4 = var3.split(",");
  71.                         int start1 = Integer.parseInt(var4[0].substring(1)) - 1;
  72.                         int end1 = start1 + Integer.parseInt(var4[1]);
  73.                         for (int i = start1; i < end1; i++) {
  74.                             lineTextPositions2.get(i).setType("2");
  75.                         }
  76.                     }
  77.                 });
  78.             }
  79.  
  80.             // 输出差异文件
  81.             PDDocument pdDocument1 = PDDocument.load(file1);
  82.             // 突出显示删除
  83.             for (LineTextPosition lineTextPosition : lineTextPositions1) {
  84.                 if (lineTextPosition.getType().equals("1")) {
  85.                     PDPage page = pdDocument1.getPage(lineTextPosition.getPageNum() - 1);
  86.                     PDAnnotationTextMarkup markup = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.SUB_TYPE_HIGHLIGHT);
  87.                     markup.setColor(new PDColor(new float[] { 1, 0, 0}, PDDeviceRGB.INSTANCE));
  88.                     float x = lineTextPosition.getX();
  89.                     float y = lineTextPosition.getY();
  90.                     float width = lineTextPosition.getWidth();
  91.                     float height = lineTextPosition.getHeight();
  92.                     PDRectangle bounds = new PDRectangle(x, y - (height / 2), width, height * 2);
  93.                     markup.setRectangle(bounds);
  94.                     // 从左下角计算 依次为左下、右下、左上、右上
  95.                     float []p=pDRectangle2QuadPoints(bounds);
  96.                     markup.setQuadPoints(p);
  97.                     page.getAnnotations().add(markup);
  98.                 }
  99.             }
  100.             pdDocument1.save(outputOldPdfPath);
  101.             pdDocument1.close();
  102.  
  103.             PDDocument pdDocument2 = PDDocument.load(file2);
  104.             // 突出显示删除
  105.             for (LineTextPosition lineTextPosition : lineTextPositions2) {
  106.                 if (lineTextPosition.getType().equals("2")) {
  107.                     PDPage page = pdDocument2.getPage(lineTextPosition.getPageNum() - 1);
  108.                     PDAnnotationTextMarkup markup = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.SUB_TYPE_HIGHLIGHT);
  109.                     markup.setColor(new PDColor(new float[] { 0, 255, 0}, PDDeviceRGB.INSTANCE));
  110.                     float x = lineTextPosition.getX();
  111.                     float y = lineTextPosition.getY();
  112.                     float width = lineTextPosition.getWidth();
  113.                     float height = lineTextPosition.getHeight();
  114.                     PDRectangle bounds = new PDRectangle(x, y - (height / 2), width, height * 2);
  115.                     markup.setRectangle(bounds);
  116.                     // 从左下角计算 依次为左下、右下、左上、右上
  117.                     float []p=pDRectangle2QuadPoints(bounds);
  118.                     markup.setQuadPoints(p);
  119.                     page.getAnnotations().add(markup);
  120.                 }
  121.             }
  122.             pdDocument2.save(outputNewPdfPath);
  123.             pdDocument2.close();
  124.         } catch (IOException e) {
  125.             return 1;
  126.         }
  127.         return 0;
  128.     }
  129.  
  130.     /**
  131.      * 获取上下文差异描述信息
  132.      * @param originalFileName 源文件名称
  133.      * @param original 源文件文本信息
  134.      * @param revisedFileName 新文件名称
  135.      * @param revised 新文件文本信息
  136.      * @return
  137.      */
  138.     public static List<String> getUnifiedDiff(String originalFileName, List<String> original, String revisedFileName, List<String> revised) {
  139.         Patch<String> patch = com.github.difflib.DiffUtils.diff(original, revised);
  140.         List<String> unifiedDiff = UnifiedDiffUtils.generateUnifiedDiff(originalFileName, revisedFileName, original, patch, 0);
  141.         int diffCount = unifiedDiff.size();
  142.         if (diffCount == 0) {
  143.             //如果两文件没差异则插入如下
  144.             unifiedDiff.add("--- " + originalFileName);
  145.             unifiedDiff.add("+++ " + revisedFileName);
  146.             unifiedDiff.add("@@ -0,0 +0,0 @@");
  147.         } else if (diffCount >= 3 && !unifiedDiff.get(2).contains("@@ -1,")) {
  148.             // 如果至少有一处变化，并且变化不在第一行
  149.             unifiedDiff.set(1, unifiedDiff.get(1));
  150.             //如果第一行没变化则插入@@ -0,0 +0,0 @@
  151.             unifiedDiff.add(2, "@@ -0,0 +0,0 @@");
  152.         }
  153.         return unifiedDiff;
  154.     }
  155.  
  156.     // 矩阵置换坐标
  157.     private static float[] pDRectangle2QuadPoints(PDRectangle bounds) {
  158.         float []p=new float[8];
  159.         p[0]=bounds.getLowerLeftX();
  160.         p[1]=bounds.getLowerLeftY();
  161.         p[2]=bounds.getUpperRightX();
  162.         p[3]=bounds.getLowerLeftY();
  163.         p[4]=bounds.getLowerLeftX();
  164.         p[5]=bounds.getUpperRightY();
  165.         p[6]=bounds.getUpperRightX();
  166.         p[7]=bounds.getUpperRightY();
  167.         return p;
  168.     }
  169.  
  170.     /**
  171.      * 构建PDFTextStripper
  172.      * @param file
  173.      * @return
  174.      */
  175.     private static List<GetCharLocationAndSize> buildCharLocationAndSize(File file) {
  176.         List<GetCharLocationAndSize> pdfTextStripperList;
  177.         PDDocument pdDocument = null;
  178.         try {
  179.             pdDocument = PDDocument.load(file);
  180.             int pageCount = pdDocument.getNumberOfPages();
  181.             pdfTextStripperList = new ArrayList<>(pageCount);
  182.             for (int i = 1; i <= pageCount; i++) {
  183.                 GetCharLocationAndSize pdfTextStripper = new GetCharLocationAndSize();
  184.                 pdfTextStripper.setPageNum(i);
  185.                 pdfTextStripper.setSortByPosition(true);
  186.                 pdfTextStripper.setStartPage(i);
  187.                 pdfTextStripper.setEndPage(i);
  188.                 StringWriter writer = new StringWriter();
  189.                 pdfTextStripper.writeText(pdDocument, writer);
  190.                 pdfTextStripperList.add(pdfTextStripper);
  191.             }
  192.         } catch (Exception e) {
  193.             return null;
  194.         } finally {
  195.             if (pdDocument != null) {
  196.                 try {
  197.                     pdDocument.close();
  198.                 } catch (IOException e) {
  199.                     e.printStackTrace();
  200.                 }
  201.             }
  202.         }
  203.         return pdfTextStripperList;
  204.     }
  205. }

工具类中用到的其他自定义的类

GetCharLocationAndSize.class   、  LineTextPosition.class

  1. package com.pdf.pdfcomparer.overide;
  2.  
  3. import org.apache.pdfbox.text.PDFTextStripper;
  4. import org.apache.pdfbox.text.TextPosition;
  5.  
  6. import java.io.IOException;
  7. import java.util.ArrayList;
  8. import java.util.List;
  9.  
  10. /**
  11.  * 每页pdf对应一个实例
  12.  */
  13. public class GetCharLocationAndSize extends PDFTextStripper {
  14.  
  15.     private final List<LineTextPosition> lineTextPositions = new ArrayList<>();
  16.  
  17.     private int pageNum = 0;
  18.  
  19.     public GetCharLocationAndSize() throws IOException {
  20.     }
  21.  
  22.     @Override
  23.     protected void writeString(String text, List<TextPosition> textPositions) throws IOException {
  24.         // 记录行文本和每个字符位置信息
  25.         LineTextPosition lineTextPosition = new LineTextPosition();
  26.         lineTextPosition.setLineText(text);
  27.         // 计算本段文字矩阵参数，距离页左上角的坐标
  28.         TextPosition textPosition = textPositions.get(0);
  29.         float pageHeight = textPosition.getPageHeight();
  30.         float x = textPosition.getXDirAdj();
  31.         float y = pageHeight - textPosition.getYDirAdj();
  32.         float width = 0.0f;
  33.         float height = 0.0f;
  34.         for (TextPosition textPosition1 : textPositions) {
  35.             width += textPosition1.getWidthDirAdj();
  36.             if (textPosition1.getHeightDir() > height) {
  37.                 height = textPosition1.getHeightDir();
  38.             }
  39.         }
  40.         lineTextPosition.setX(x);
  41.         lineTextPosition.setY(y);
  42.         lineTextPosition.setWidth(width);
  43.         lineTextPosition.setHeight(height);
  44.         lineTextPosition.setPageNum(pageNum);
  45.         lineTextPositions.add(lineTextPosition);
  46.         writeString(text);
  47.     }
  48.  
  49.     public List<LineTextPosition> getLineTextPositions(){
  50.         return lineTextPositions;
  51.     }
  52.  
  53.     public int getPageNum() {
  54.         return pageNum;
  55.     }
  56.  
  57.     public void setPageNum(int pageNum) {
  58.         this.pageNum = pageNum;
  59.     }
  60. }
  1. package com.pdf.pdfcomparer.overide;
  2.  
  3.  
  4. public class LineTextPosition {
  5.  
  6.     /**
  7.      * 行文本
  8.      */
  9.     private String lineText;
  10.  
  11.     /**
  12.      * 文本矩阵左下坐标x
  13.      */
  14.     private float x;
  15.  
  16.     /**
  17.      * 文本矩阵左下坐标y
  18.      */
  19.     private float y;
  20.  
  21.     /**
  22.      * 宽度
  23.      */
  24.     private float width;
  25.  
  26.     /**
  27.      * 高度
  28.      */
  29.     private float height;
  30.  
  31.     /**
  32.      * 所在页数
  33.      */
  34.     private int pageNum;
  35.  
  36.     /**
  37.      * 类型 "0"：原文 ，"1"：删除 ，"2"：新增
  38.      */
  39.     private String type = "0";
  40.  
  41.     public String getLineText() {
  42.         return lineText;
  43.     }
  44.  
  45.     public void setLineText(String lineText) {
  46.         this.lineText = lineText;
  47.     }
  48.  
  49.     public float getX() {
  50.         return x;
  51.     }
  52.  
  53.     public void setX(float x) {
  54.         this.x = x;
  55.     }
  56.  
  57.     public float getY() {
  58.         return y;
  59.     }
  60.  
  61.     public void setY(float y) {
  62.         this.y = y;
  63.     }
  64.  
  65.     public float getWidth() {
  66.         return width;
  67.     }
  68.  
  69.     public void setWidth(float width) {
  70.         this.width = width;
  71.     }
  72.  
  73.     public float getHeight() {
  74.         return height;
  75.     }
  76.  
  77.     public void setHeight(float height) {
  78.         this.height = height;
  79.     }
  80.  
  81.     public int getPageNum() {
  82.         return pageNum;
  83.     }
  84.  
  85.     public void setPageNum(int pageNum) {
  86.         this.pageNum = pageNum;
  87.     }
  88.  
  89.     public String getType() {
  90.         return type;
  91.     }
  92.  
  93.     public void setType(String type) {
  94.         this.type = type;
  95.     }
  96. }

 

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