如何使用java实现查找PDF关键字所在页码及其坐标

这篇文章给大家分享的是有关如何使用java实现查找PDF关键字所在页码及其坐标的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

1、因为最近有这方面的需求，用过之后记录一下。

2、此功能跟PDF中Ctrl+F性质一样，如果PDF中为图片形式的不支持定位到关键字。

import com.itextpdf.awt.geom.Rectangle2D.Float;import com.itextpdf.text.pdf.PdfDictionary;import com.itextpdf.text.pdf.PdfName;import com.itextpdf.text.pdf.PdfReader;import com.itextpdf.text.pdf.parser.*;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;/** * 消失的太阳 */public class MyTest { public static void main(String[] args) throws IOException {  //1.给定文件  File pdfFile = new File("D://test.pdf");  //2.定义一个byte数组，长度为文件的长度  byte[] pdfData = new byte[(int) pdfFile.length()];  //3.IO流读取文件内容到byte数组  FileInputStream inputStream = null;  try {   inputStream = new FileInputStream(pdfFile);   inputStream.read(pdfData);  } catch (IOException e) {   throw e;  } finally {   if (inputStream != null) {    try {     inputStream.close();    } catch (IOException e) {    }   }  }  //4.指定关键字  String keyword = "消失的太阳：";  //5.调用方法，给定关键字和文件  List positions = findKeywordPostions(pdfData, keyword);  //6.返回值类型是 List 每个list元素代表一个匹配的位置，分别为 float[0]所在页码 float[1]所在x轴 float[2]所在y轴  System.out.println("total:" + positions.size());  if (positions != null && positions.size() > 0) {   for (float[] position : positions) {    System.out.print("pageNum: " + (int) position[0]);    System.out.print("\tx: " + position[1]);    System.out.println("\ty: " + position[2]);   }  } } /**  * findKeywordPostions  * @param pdfData  通过IO流 PDF文件转化的byte数组  * @param keyword  关键字  * @return List : float[0]:pageNum float[1]:x float[2]:y  * @throws IOException  */ public static List findKeywordPostions(byte[] pdfData, String keyword) throws IOException {  List result = new ArrayList<>();  List pdfPageContentPositions = getPdfContentPostionsList(pdfData);  for (PdfPageContentPositions pdfPageContentPosition : pdfPageContentPositions) {   List charPositions = findPositions(keyword, pdfPageContentPosition);   if (charPositions == null || charPositions.size() < 1) {    continue;   }   result.addAll(charPositions);  }  return result; } private static List getPdfContentPostionsList(byte[] pdfData) throws IOException {  PdfReader reader = new PdfReader(pdfData);  List result = new ArrayList<>();  int pages = reader.getNumberOfPages();  for (int pageNum = 1; pageNum <= pages; pageNum++) {   float width = reader.getPageSize(pageNum).getWidth();   float height = reader.getPageSize(pageNum).getHeight();   PdfRenderListener pdfRenderListener = new PdfRenderListener(pageNum, width, height);   //解析pdf，定位位置   PdfContentStreamProcessor processor = new PdfContentStreamProcessor(pdfRenderListener);   PdfDictionary pageDic = reader.getPageN(pageNum);   PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES);   try {    processor.processContent(ContentByteUtils.getContentBytesForPage(reader, pageNum), resourcesDic);   } catch (IOException e) {    reader.close();    throw e;   }   String content = pdfRenderListener.getContent();   List charPositions = pdfRenderListener.getcharPositions();   List positionsList = new ArrayList<>();   for (CharPosition charPosition : charPositions) {    float[] positions = new float[]{charPosition.getPageNum(), charPosition.getX(), charPosition.getY()};    positionsList.add(positions);   }   PdfPageContentPositions pdfPageContentPositions = new PdfPageContentPositions();   pdfPageContentPositions.setContent(content);   pdfPageContentPositions.setPostions(positionsList);   result.add(pdfPageContentPositions);  }  reader.close();  return result; } private static List findPositions(String keyword, PdfPageContentPositions pdfPageContentPositions) {  List result = new ArrayList<>();  String content = pdfPageContentPositions.getContent();  List charPositions = pdfPageContentPositions.getPositions();  for (int pos = 0; pos < content.length(); ) {   int positionIndex = content.indexOf(keyword, pos);   if (positionIndex == -1) {    break;   }   float[] postions = charPositions.get(positionIndex);   result.add(postions);   pos = positionIndex + 1;  }  return result; } private static class PdfPageContentPositions {  private String content;  private List positions;  public String getContent() {   return content;  }  public void setContent(String content) {   this.content = content;  }  public List getPositions() {   return positions;  }  public void setPostions(List positions) {   this.positions = positions;  } } private static class PdfRenderListener implements RenderListener {  private int pageNum;  private float pageWidth;  private float pageHeight;  private StringBuilder contentBuilder = new StringBuilder();  private List charPositions = new ArrayList<>();  public PdfRenderListener(int pageNum, float pageWidth, float pageHeight) {   this.pageNum = pageNum;   this.pageWidth = pageWidth;   this.pageHeight = pageHeight;  }  public void beginTextBlock() {  }  public void renderText(TextRenderInfo renderInfo) {   List characterRenderInfos = renderInfo.getCharacterRenderInfos();   for (TextRenderInfo textRenderInfo : characterRenderInfos) {    String word = textRenderInfo.getText();    if (word.length() > 1) {     word = word.substring(word.length() - 1, word.length());    }    Float rectangle = textRenderInfo.getAscentLine().getBoundingRectange();    float x = (float)rectangle.getX();    float y = (float)rectangle.getY();//    float x = (float)rectangle.getCenterX();//    float y = (float)rectangle.getCenterY();//    double x = rectangle.getMinX();//    double y = rectangle.getMaxY();    //这两个是关键字在所在页面的XY轴的百分比    float xPercent = Math.round(x / pageWidth * 10000) / 10000f;    float yPercent = Math.round((1 - y / pageHeight) * 10000) / 10000f;//    CharPosition charPosition = new CharPosition(pageNum, xPercent, yPercent);    CharPosition charPosition = new CharPosition(pageNum, (float)x, (float)y);    charPositions.add(charPosition);    contentBuilder.append(word);   }  }  public void endTextBlock() {  }  public void renderImage(ImageRenderInfo renderInfo) {  }  public String getContent() {   return contentBuilder.toString();  }  public List getcharPositions() {   return charPositions;  } } private static class CharPosition {  private int pageNum = 0;  private float x = 0;  private float y = 0;  public CharPosition(int pageNum, float x, float y) {   this.pageNum = pageNum;   this.x = x;   this.y = y;  }  public int getPageNum() {   return pageNum;  }  public float getX() {   return x;  }  public float getY() {   return y;  }  @Override  public String toString() {   return "[pageNum=" + this.pageNum + ",x=" + this.x + ",y=" + this.y + "]";  } }}

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