使用PDFBox處理PDF文檔

2019-11-10 19:12:40

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使用PDFBox處理PDF文檔（新建PDF文件、修改PDF文件、PDF中插入圖片、將PDF文件轉換為圖片）

閱讀：4462 時間：2015-01-26 20:07分享：7

項目需要在原有的PDF文件中插入圖片、文字，并將最終的PDF文件轉換為圖片，在網上找了很多Demo，現在開源可以解析處理PDF文件的第三方插件比較多，eg：IText、PDFBox等，現在就PDFBox解析處理PDF文件總結如下：

【PDFBox簡介】

自從Adobe公司1993年第一次發布公共PDF參考以來，支持各種語言和平臺的PDF工具和類庫就如雨后春筍般涌現。然而，java應用開發中Adobe技術的支持相對滯后了。這是個奇怪的現象，因為PDF文檔是企業信息系統存儲和交換信息的大勢所趨，而Java技術特別適合這種應用。然而，Java開發人員似乎直到最近才獲得成熟可用的PDF支持。 PDFBox（一個BSD許可下的源碼開放項目）是一個為開發人員讀取和創建PDF文檔而準備的純Java類庫。它提供如下特性：提取文本，包括Unicode字符。和Jakarta Lucene等文本搜索引擎的整合過程十分簡單。加密/解密PDF文檔。從PDF和XFDF格式中導入或導出表單數據。向已有PDF文檔中追加內容。將一個PDF文檔切分為多個文檔。覆蓋PDF文檔。 PS：http://baike.baidu.com/link?url=TsYWHJtTPMhlf0UvKzPOk-j3f9KzF7morIa4CqoZ0s4yIDCLB3z8nLVgLHVz-AO4dE6S7ls_3_yuvXP03nLSiq

【PDFBox下載】

最常見的一種PDF文本抽取工具就是PDFBox了，訪問網址http://pdfbox.apache.org/download.cgi，進入如下圖所示的下載界面。讀者可以在該網頁下載其最新的版本。本書采用的是pdfbox-1.8.8版本。PDFBox是一個開源的Java PDF庫，這個庫允許你訪問PDF文件的各項信息。在接下來的例子中，將演示如何使用PDFBox提供的API操作PDF文件。

【將剛下載的7個jar包引入到工程當中】

pdfbox-1.8.8-src.zip為pdfbox源代碼，里面有很對的例子，在pdfbox-1.8.8/examples目錄下存在

【以下為Demo正式開始】

1、創建PDF文件

 1     public void createHelloPDF() { 2         PDDocument doc = null; 3         PDPage page = null; 4  5         try { 6             doc = new PDDocument(); 7             page = new PDPage(); 8             doc.addPage(page); 9             PDFont font = PDType1Font.HELVETICA_BOLD;10             PDPageContentStream content = new PDPageContentStream(doc, page);11             content.beginText();12             content.setFont(font, 12);13             content.moveTextPositionByAmount(100, 700);14             content.drawString("hello");15 16             content.endText();17             content.close();18             doc.save("F://java56班//eclipse-SDK-4.2-win32//pdfwithText.pdf");19             doc.close();20         } catch (Exception e) {21             System.out.PRintln(e);22         }23     } 
2、讀取PDF文件：
 1     public void readPDF() { 2         PDDocument helloDocument = null; 3         try { 4             helloDocument = PDDocument.load(new File( 5                     "F://java56班//eclipse-SDK-4.2-win32//pdfwithText.pdf")); 6             PDFTextStripper textStripper = new PDFTextStripper("GBK"); 7             System.out.println(textStripper.getText(helloDocument)); 8  9             helloDocument.close();10         } catch (IOException e) {11             // TODO Auto-generated catch block12             e.printStackTrace();13         }14     }3、修改PDF文件（處理中文亂碼，我可以搞定的）：
 1  /** 2      * Locate a string in a PDF and replace it with a new string. 3      * 4      * @param inputFile The PDF to open. 5      * @param outputFile The PDF to write to. 6      * @param strToFind The string to find in the PDF document. 7      * @param message The message to write in the file. 8      * 9      * @throws IOException If there is an error writing the data.10      * @throws COSVisitorException If there is an error writing the PDF.11      */12     public void doIt( String inputFile, String outputFile, String strToFind, String message)13         throws IOException, COSVisitorException14     {15         // the document16         PDDocument doc = null;17         try18         {19             doc = PDDocument.load( inputFile );20 //            PDFTextStripper stripper=new PDFTextStripper("ISO-8859-1");21             List pages = doc.getDocumentCatalog().getAllPages();22             for( int i=0; i<pages.size(); i++ )23             {24                 PDPage page = (PDPage)pages.get( i );25                 PDStream contents = page.getContents();26                 PDFStreamParser parser = new PDFStreamParser(contents.getStream() );27                 parser.parse();28                 List tokens = parser.getTokens();29                 for( int j=0; j<tokens.size(); j++ )30                 {31                     Object next = tokens.get( j );32                     if( next instanceof PDFOperator )33                     {34                         PDFOperator op = (PDFOperator)next;35                         //Tj and TJ are the two operators that display36                         //strings in a PDF37                         if( op.getOperation().equals( "Tj" ) )38                         {39                             //Tj takes one operator and that is the string40                             //to display so lets update that operator41                             COSString previous = (COSString)tokens.get( j-1 );42                             String string = previous.getString();43                             string = string.replaceFirst( strToFind, message );44                             System.out.println(string);45                             System.out.println(string.getBytes("GBK"));46                             previous.reset();47                             previous.append( string.getBytes("GBK") );48                         }49                         else if( op.getOperation().equals( "TJ" ) )50                         {51                             COSArray previous = (COSArray)tokens.get( j-1 );52                             for( int k=0; k<previous.size(); k++ )53                             {54                                 Object arrElement = previous.getObject( k );55                                 if( arrElement instanceof COSString )56                                 {57                                     COSString cosString = (COSString)arrElement;58                                     String string = cosString.getString();59                                     string = string.replaceFirst( strToFind, message );60                                     cosString.reset();61                                     cosString.append( string.getBytes("GBK") );62                                 }63                             }64                         }65                     }66                 }67                 //now that the tokens are updated we will replace the68                 //page content stream.69                 PDStream updatedStream = new PDStream(doc);70                 OutputStream out = updatedStream.createOutputStream();71                 ContentStreamWriter tokenWriter = new ContentStreamWriter(out);72                 tokenWriter.writeTokens( tokens );73                 page.setContents( updatedStream );74             }75             doc.save( outputFile );76         }77         finally78         {79             if( doc != null )80             {81                 doc.close();82             }83         }84     }4、在PDF中加入圖片：
 1 /** 2      * Add an image to an existing PDF document. 3      * 4      * @param inputFile The input PDF to add the image to. 5      * @param image The filename of the image to put in the PDF. 6      * @param outputFile The file to write to the pdf to. 7      * 8      * @throws IOException If there is an error writing the data. 9      * @throws COSVisitorException If there is an error writing the PDF.10      */11     public void createPDFFromImage( String inputFile, String image, String outputFile ) 12         throws IOException, COSVisitorException13     {14         // the document15         PDDocument doc = null;16         try17         {18             doc = PDDocument.load( inputFile );19 20             //we will add the image to the first page.21             PDPage page = (PDPage)doc.getDocumentCatalog().getAllPages().get( 0 );22 23             PDXObjectImage ximage = null;24             if( image.toLowerCase().endsWith( ".jpg" ) )25             {26                 ximage = new PDJpeg(doc, new FileInputStream( image ) );27             }28             else if (image.toLowerCase().endsWith(".tif") || image.toLowerCase().endsWith(".tiff"))29             {30                 ximage = new PDCcitt(doc, new RandomaccessFile(new File(image),"r"));31             }32             else33             {34                 BufferedImage awtImage = ImageIO.read( new File( image ) );35                 ximage = new PDPixelMap(doc, awtImage);36             }37             PDPageContentStream contentStream = new PDPageContentStream(doc, page, true, true);38 39             //contentStream.drawImage(ximage, 20, 20 );40             // better method inspired by http://stackoverflow.com/a/22318681/53564641             float scale = 0.5f; // reduce this value if the image is too large42             System.out.println(ximage.getHeight());43             System.out.println(ximage.getWidth());44 //            ximage.setHeight(ximage.getHeight()/5);45 //            ximage.setWidth(ximage.getWidth()/5);46             contentStream.drawXObject(ximage, 20, 200, ximage.getWidth()*scale, ximage.getHeight()*scale);47 48             contentStream.close();49             doc.save( outputFile );50         }51         finally52         {53             if( doc != null )54             {55                 doc.close();56             }57         }58     }5、PDF文件轉換為圖片：
 1 public void toImage() { 2     try { 3         PDDocument doc = PDDocument 4                 .load("F://java56班//eclipse-SDK-4.2-win32//pdfwithText.pdf"); 5         int pageCount = doc.getPageCount(); 6         System.out.println(pageCount); 7         List pages = doc.getDocumentCatalog().getAllPages(); 8         for (int i = 0; i < pages.size(); i++) { 9             PDPage page = (PDPage) pages.get(i);10             BufferedImage image = page.convertToImage();11             Iterator iter = ImageIO.getImageWritersBySuffix("jpg");12             ImageWriter writer = (ImageWriter) iter.next();13             File outFile = new File("F://java56班//eclipse-SDK-4.2-win32//"14                     + i + ".jpg");15             FileOutputStream out = new FileOutputStream(outFile);16             ImageOutputStream outImage = ImageIO17                     .createImageOutputStream(out);18             writer.setOutput(outImage);19             writer.write(new IIOImage(image, null, null));20         }21         doc.close();22         System.out.println("over");23     } catch (FileNotFoundException e) {24         // TODO Auto-generated catch block25         e.printStackTrace();26     } catch (IOException e) {27         // TODO Auto-generated catch block28         e.printStackTrace();29     }30 } 
6、圖片轉換為PDF文件（支持多張圖片轉換為PDF文件）：
 1 /** 2      * create the second sample document from the PDF file format specification. 3      *  4      * @param file 5      *            The file to write the PDF to. 6      * @param image 7      *            The filename of the image to put in the PDF. 8      *  9      * @throws IOException10      *             If there is an error writing the data.11      * @throws COSVisitorException12      *             If there is an error writing the PDF.13      */14     public void createPDFFromImage(String file, String image)throws IOException, COSVisitorException {15         // 多張圖片轉換為PDF文件16         PDDocument doc = null;17         doc = new PDDocument();18         PDPage page = null;19         PDXObjectImage ximage = null;20         PDPageContentStream contentStream = null;21 22         File files = new File(image);23         String[] a = files.list();24         for (String string : a) {25             if (string.toLowerCase().endsWith(".jpg")) {26                 String temp = image + "//" + string;27                 ximage = new PDJpeg(doc, new FileInputStream(temp));28                 page = new PDPage();29                 doc.addPage(page);30                 contentStream = new PDPageContentStream(doc, page);31                 float scale = 0.5f;32                 contentStream.drawXObject(ximage, 20, 400, ximage.getWidth()33                         * scale, ximage.getHeight() * scale);34                 35                 PDFont font = PDType1Font.HELVETICA_BOLD;36                 contentStream.beginText();37                 contentStream.setFont(font, 12);38                 contentStream.moveTextPositionByAmount(100, 700);39                 contentStream.drawString("Hello");40                 contentStream.endText();41                 42                 contentStream.close();43             }44         }45         doc.save(file);46         doc.close();47     }7、替換PDF文件中的某個字符串：
 1  /** 2      * Locate a string in a PDF and replace it with a new string. 3      * 4      * @param inputFile The PDF to open. 5      * @param outputFile The PDF to write to. 6      * @param strToFind The string to find in the PDF document. 7      * @param message The message to write in the file. 8      * 9      * @throws IOException If there is an error writing the data.10      * @throws COSVisitorException If there is an error writing the PDF.11      */12     public void doIt( String inputFile, String outputFile, String strToFind, String message)13         throws IOException, COSVisitorException14     {15         // the document16         PDDocument doc = null;17         try18         {19             doc = PDDocument.load( inputFile );20 //            PDFTextStripper stripper=new PDFTextStripper("ISO-8859-1");21             List pages = doc.getDocumentCatalog().getAllPages();22             for( int i=0; i<pages.size(); i++ )23             {24                 PDPage page = (PDPage)pages.get( i );25                 PDStream contents = page.getContents();26                 PDFStreamParser parser = new PDFStreamParser(contents.getStream() );27                 parser.parse();28                 List tokens = parser.getTokens();29                 for( int j=0; j<tokens.size(); j++ )30                 {31                     Object next = tokens.get( j );32                     if( next instanceof PDFOperator )33                     {34                         PDFOperator op = (PDFOperator)next;35                         //Tj and TJ are the two operators that display36                         //strings in a PDF37                         if( op.getOperation().equals( "Tj" ) )38                         {39                             //Tj takes one operator and that is the string40                             //to display so lets update that operator41                             COSString previous = (COSString)tokens.get( j-1 );42                             String string = previous.getString();43                             string = string.replaceFirst( strToFind, message );44                             System.out.println(string);45                             System.out.println(string.getBytes("GBK"));46                             previous.reset();47                             previous.append( string.getBytes("GBK") );48                         }49                         else if( op.getOperation().equals( "TJ" ) )50                         {51                             COSArray previous = (COSArray)tokens.get( j-1 );52                             for( int k=0; k<previous.size(); k++ )53                             {54                                 Object arrElement = previous.getObject( k );55                                 if( arrElement instanceof COSString )56                                 {57                                     COSString cosString = (COSString)arrElement;58                                     String string = cosString.getString();59                                     string = string.replaceFirst( strToFind, message );60                                     cosString.reset();61                                     cosString.append( string.getBytes("GBK") );62                                 }63                             }64                         }65                     }66                 }67                 //now that the tokens are updated we will replace the68                 //page content stream.69                 PDStream updatedStream = new PDStream(doc);70                 OutputStream out = updatedStream.createOutputStream();71                 ContentStreamWriter tokenWriter = new ContentStreamWriter(out);72                 tokenWriter.writeTokens( tokens );73                 page.setContents( updatedStream );74             }75             doc.save( outputFile );76         }77         finally78         {79             if( doc != null )80             {81                 doc.close();82             }83         }84     } 
上述描述的只是PDFBox的部分功能，在原始資源包中有很對例子，大家可以學習，PDFBox API路徑：http://pdfbox.apache.org/docs/1.8.8/javadocs/
轉載自：愛編程w2bc.com