pdf轉圖片、提取pdf文字、提取pdf圖片
阿新 • • 發佈：2019-01-08
| package com.midevip.common.util; | |
| import com.itextpdf.text.pdf.PdfReader; | |
| import net.coobird.thumbnailator.Thumbnails; | |
| import org.apache.pdfbox.cos.COSName; | |
| import org.apache.pdfbox.pdmodel.*; |
|
| import org.apache.pdfbox.pdmodel.encryption.AccessPermission; | |
| import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject; | |
| import org.apache.pdfbox.rendering.PDFRenderer; | |
| import org.apache.pdfbox.text.PDFTextStripper; |
|
| import javax.imageio.IIOImage; | |
| import javax.imageio.ImageIO; | |
| import javax.imageio.ImageWriteParam; | |
| import javax.imageio.ImageWriter; | |
| import java.awt.image.BufferedImage; |
|
| import java.io.File; | |
| import java.io.IOException; | |
| import java.io.InputStream; | |
| import java.text.SimpleDateFormat; | |
| import java.util.Calendar; | |
| import java.util.Iterator; | |
| /** | |
| * 使用pdfbox提取pdf文件的文字和圖片內容 | |
| * pdfbox官網：https://pdfbox.apache.org/ | |
| * maven依賴如下： | |
| * <dependency> | |
| * <groupId>org.apache.pdfbox</groupId> | |
| * <artifactId>fontbox</artifactId> | |
| * <version>2.0.1</version> | |
| * </dependency> | |
| * <dependency> | |
| * <groupId>org.apache.pdfbox</groupId> | |
| * <artifactId>pdfbox</artifactId> | |
| * <version>2.0.1</version> | |
| * </dependency> | |
| * <dependency> | |
| * <groupId>com.itextpdf</groupId> | |
| * <artifactId>itextpdf</artifactId> | |
| * <version>5.5.13</version> | |
| * </dependency> | |
| * <dependency> | |
| * <groupId>net.coobird</groupId> | |
| * <artifactId>thumbnailator</artifactId> | |
| * <version>0.4.8</version> | |
| * </dependency> | |
| */ | |
| public class PdfTest { | |
| public static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss"; | |
| /** | |
| * | |
| * | |
| * @param pdfFilePath | |
| * @throws Exception | |
| */ | |
| public static void extractText(String pdfFilePath) throws Exception{ | |
| try (PDDocument document = PDDocument.load(new File(pdfFilePath))) | |
| { | |
| AccessPermission ap = document.getCurrentAccessPermission(); | |
| if (!ap.canExtractContent()) | |
| { | |
| throw new IOException("You do not have permission to extract text"); | |
| } | |
| PDFTextStripper stripper = new PDFTextStripper(); | |
| stripper.setSortByPosition(true); | |
| for (int p = 1; p <= document.getNumberOfPages(); ++p) | |
| { | |
| // 這裡分為一頁一頁的提取，如果不設定，預設會把所有頁的內容一次性提取出來，根據需要選擇 | |
| stripper.setStartPage(p); | |
| stripper.setEndPage(p); | |
| //提取內容就這一行程式碼 | |
| //提取內容很徹底，包括了頁首頁尾的內容也都會被提出來 | |
| String text = stripper.getText(document); | |
| String pageStr = String.format("page %d:", p); | |
| System.out.println(pageStr); | |
| //為了打印出來更美觀 | |
| for (int i = 0; i < pageStr.length(); ++i) | |
| { | |
| System.out.print("-"); | |
| } | |
| System.out.println(); | |
| System.out.println(text.trim()); | |
| System.out.println(); | |
| } | |
| } | |
| } | |
| public static void pdfParse(String pdfPath) throws Exception { | |
| InputStream input = null; | |
| PDDocument document = null; | |
| try { | |
| document = PDDocument.load(new File(pdfPath)); | |
| /** 文件屬性資訊 **/ | |
| PDDocumentInformation info = document.getDocumentInformation(); | |
| System.out.println("標題:" + info.getTitle()); | |
| System.out.println("主題:" + info.getSubject()); | |
| System.out.println("作者:" + info.getAuthor()); | |
| System.out.println("關鍵字:" + info.getKeywords()); | |
| System.out.println("應用程式:" + info.getCreator()); | |
| System.out.println("pdf 製作程式:" + info.getProducer()); | |
| System.out.println("作者:" + info.getTrapped()); | |
| System.out.println("建立時間:" + dateFormat(info.getCreationDate())); | |
| System.out.println("修改時間:" + dateFormat(info.getModificationDate())); | |
| //獲取內容資訊 | |
| PDFTextStripper pts = new PDFTextStripper(); | |
| String content = pts.getText(document); | |
| System.out.println("內容:" + content); | |
| /** 文件頁面資訊 **/ | |
| PDDocumentCatalog cata = document.getDocumentCatalog(); | |
| int count = 1; | |
| for (int i = 0; i < document.getNumberOfPages(); i++) { | |
| PDPage page = document.getPage(i); | |
| if (null != page) { | |
| //獲取到所有rescourse資訊 | |
| PDResources res = page.getResources(); | |
| Iterable<COSName> xit = res.getXObjectNames(); | |
| Iterator<COSName> iterator = xit.iterator(); | |
| while (iterator.hasNext()){ | |
| COSName cosName = iterator.next(); | |
| System.out.println(cosName.getName()); | |
| //判斷是否圖片資源，這個提取圖片也很徹底，包括頁首頁尾的圖片也會被獲取到 | |
| if(res.isImageXObject(cosName)){ | |
| PDImageXObject pdImageXObject = (PDImageXObject)res.getXObject(cosName); | |
| //這裡儲存圖片我用了谷歌的thumbnailator框架，也可以用自己的方法去儲存BufferedImage物件到本地圖片 | |
| Thumbnails.of(pdImageXObject.getImage()).scale(0.9).toFile(new File("D:\\pdf\\"+System.currentTimeMillis()+".jpg")); | |
| } | |
| } | |
| } | |
| } | |
| } catch (Exception e) { | |
| throw e; | |
| } finally { | |
| if (null != input) | |
| input.close(); | |
| if (null != document) | |
| document.close(); | |
| } | |
| } | |
| /*** | |
| * PDF檔案轉PNG圖片，全部頁數 | |
| * | |
| * @param PdfFilePath pdf完整路徑 | |
| * @param dpi dpi越大轉換後越清晰，相對轉換速度越慢 | |
| * @return | |
| */ | |
| private static boolean pdf2Image(String PdfFilePath, String dstImgFolder, int dpi) { | |
| File file = new File(PdfFilePath); | |
| PDDocument pdDocument; | |
| try { | |
| String imgPDFPath = file.getParent(); | |
| int dot = file.getName().lastIndexOf('.'); | |
| String imagePDFName = file.getName().substring(0, dot); // 獲取圖片檔名 | |
| String imgFolderPath = null; | |
| if (dstImgFolder.equals("")) { | |
| imgFolderPath = imgPDFPath + File.separator + imagePDFName;// 獲取圖片存放的資料夾路徑 | |
| } else { | |
| imgFolderPath = dstImgFolder + File.separator + imagePDFName; | |
| } | |
| if (createDirectory(imgFolderPath)) { | |
| pdDocument = PDDocument.load(file); | |
| PDFRenderer renderer = new PDFRenderer(pdDocument); | |
| /* dpi越大轉換後越清晰，相對轉換速度越慢 */ | |
| PdfReader reader = new PdfReader(PdfFilePath); | |
| int pages = reader.getNumberOfPages(); | |
| StringBuffer imgFilePath = null; | |
| for (int i = 0; i < pages; i++) { | |
| String imgFilePathPrefix = imgFolderPath + File.separator + imagePDFName; | |
| imgFilePath = new StringBuffer(); | |
| imgFilePath.append(imgFilePathPrefix); | |
| imgFilePath.append("_"); | |
| imgFilePath.append(String.valueOf(formatNumber(i+1))); | |
| imgFilePath.append(".jpg"); | |
| File dstFile = new File(imgFilePath.toString()); | |
| BufferedImage image = renderer.renderImageWithDPI(i, dpi); | |
| ImageWriter writer = ImageIO.getImageWritersByFormatName("jpg").next(); | |
| writer.setOutput(ImageIO.createImageOutputStream(dstFile)); | |
| ImageWriteParam param = writer.getDefaultWriteParam(); | |
| param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); | |
| param.setCompressionQuality(0.3f); | |
| writer.write(null, new IIOImage(image, null, null), param); | |
| // ImageIO.write(image, "jpg", dstFile); | |
| } | |
| System.out.println("PDF文件轉圖片成功！"+dstImgFolder); | |
| return true; | |
| } else { | |
| System.out.println("PDF文件轉圖片失敗：" + "建立" + imgFolderPath + "失敗"); | |
| } | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| return false; | |
| } | |
| private static String formatNumber(int i){ | |
| if(i<10){ | |
| return "00"+i; | |
| }else if(i<100){ | |
| return "0"+i; | |
| }else{ | |
| return i+""; | |
| } | |
| } | |
| private static boolean createDirectory(String folder) { | |
| File dir = new File(folder); | |
| if (dir.exists()) { | |
| return true; | |
| } else { | |
| return dir.mkdirs(); | |
| } | |
| } | |
| public static String dateFormat(Calendar calendar) throws Exception { | |
| if (null == calendar) | |
| return null; | |
| String date = null; | |
| try { | |
| String pattern = DATE_FORMAT; | |
| SimpleDateFormat format = new SimpleDateFormat(pattern); | |
| date = format.format(calendar.getTime()); | |
| } catch (Exception e) { |