pdfbox开发包下载地址：http://pdfbox.apache.org/

程序实现了PDF文档的创建，读入，与修改PDF内容并保存。

可能有个前提，PDF文档不是加密的，如果加密怎么办，我没研究过！

源代码如下：

package com.gloomyfish.ups.pdf.reader;  import java.io.File; import java.io.IOException; import java.io.OutputStream; import java.util.List;  import org.apache.pdfbox.cos.COSArray; import org.apache.pdfbox.cos.COSString; import org.apache.pdfbox.exceptions.COSVisitorException; import org.apache.pdfbox.pdfparser.PDFStreamParser; import org.apache.pdfbox.pdfwriter.ContentStreamWriter; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.common.PDStream; import org.apache.pdfbox.pdmodel.edit.PDPageContentStream; import org.apache.pdfbox.pdmodel.font.PDFont; import org.apache.pdfbox.pdmodel.font.PDType1Font; import org.apache.pdfbox.util.PDFOperator; import org.apache.pdfbox.util.PDFTextStripper;  /**  * http://pdfbox.apache.org/  *   * @author fish  *   */ public class PDFReader {      public PDFReader()  {       createHelloPDF();       readPDF();      editPDF();  }   public void createHelloPDF() {      PDDocument doc = null;         PDPage page = null;        try {           doc = new PDDocument();            page = new PDPage();           doc.addPage(page);          PDFont font = PDType1Font.HELVETICA_BOLD;          PDPageContentStream content = new PDPageContentStream(doc, page);          content.beginText();            content.setFont(font, 12);          content.moveTextPositionByAmount(100, 700);             content.drawString("Hello");              content.endText();          content.close();            doc.save("D:\\gloomyfish\\pdfwithText.pdf");          doc.close();        } catch (Exception e) {             System.out.println(e);      }   }       public void readPDF()   {       PDDocument helloDocument;       try {           helloDocument = PDDocument.load(new File(                  "D:\\gloomyfish\\pdfwithText.pdf"));          PDFTextStripper textStripper = new PDFTextStripper();          System.out.println(textStripper.getText(helloDocument));            helloDocument.close();      } catch (IOException e) {           // TODO Auto-generated catch block          e.printStackTrace();        }   }       public void editPDF() {                 try {           // pdfwithText          PDDocument helloDocument = PDDocument.load(new File("D:\\gloomyfish\\pdfwithText.pdf"));             // PDDocument helloDocument = PDDocument.load(new File("D:\\gloomyfish\\hello.pdf"));            // int pageCount = helloDocument.getNumberOfPages();           PDPage firstPage = (PDPage)helloDocument.getDocumentCatalog().getAllPages().get(0);            // PDPageContentStream content = new PDPageContentStream(helloDocument, firstPage);            PDStream contents = firstPage.getContents();                       PDFStreamParser parser = new PDFStreamParser(contents.getStream());               parser.parse();               List tokens = parser.getTokens();               for (int j = 0; j < tokens.size(); j++)               {                   Object next = tokens.get(j);                   if (next instanceof PDFOperator)                   {                      PDFOperator op = (PDFOperator) next;                       // Tj and TJ are the two operators that display strings in a PDF                       if (op.getOperation().equals("Tj"))                       {                           // Tj takes one operator and that is the string                           // to display so lets update that operator                           COSString previous = (COSString) tokens.get(j - 1);                           String string = previous.getString();                           string = string.replaceFirst("Hello", "Hello World, fish");                           //Word you want to change. Currently this code changes word "Solr" to "Solr123"                           previous.reset();                           previous.append(string.getBytes("ISO-8859-1"));                       }                       else if (op.getOperation().equals("TJ"))                       {                           COSArray previous = (COSArray) tokens.get(j - 1);                           for (int k = 0; k < previous.size(); k++)                           {                               Object arrElement = previous.getObject(k);                               if (arrElement instanceof COSString)                               {                                   COSString cosString = (COSString) arrElement;                                   String string = cosString.getString();                                   string = string.replaceFirst("Hello", "Hello World, fish");                                                                    // Currently this code changes word "Solr" to "Solr123"                                   cosString.reset();                                   cosString.append(string.getBytes("ISO-8859-1"));                               }                           }                       }                   }             }             // now that the tokens are updated we will replace the page content stream.               PDStream updatedStream = new PDStream(helloDocument);               OutputStream out = updatedStream.createOutputStream();               ContentStreamWriter tokenWriter = new ContentStreamWriter(out);               tokenWriter.writeTokens(tokens);               firstPage.setContents(updatedStream);               helloDocument.save("D:\\gloomyfish\\helloworld.pdf"); //Output file name               helloDocument.close(); //            PDFTextStripper textStripper = new PDFTextStripper(); //           System.out.println(textStripper.getText(helloDocument)); //         helloDocument.close();      } catch (IOException e) {           // TODO Auto-generated catch block          e.printStackTrace();        } catch (COSVisitorException e) {           // TODO Auto-generated catch block          e.printStackTrace();        }   }   public static void main(String[] args) {        new PDFReader();    } }