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();
	}
}