1、用到的jar有：pdfbox-1.8.4.jar ，fontbox-1.8.4.jar ，pdfbox-app-1.8.4.jar ， preflight-1.8.4.jar，preflight-app-1.8.4.jar，jempbox-1.8.4.jar，xmpbox-1.8.4

第一次写Java，不知道哪些jar是要用的，全部都添加进去了。下载地址：http://pdfbox.apache.org/downloads.html

2、将jar放在工程目录下，右键工程→Build Path→Configure Build Path→lib→Add JARs/Add External JARs

3、代码

参考：http://blog.csdn.net/meifage/article/details/6963985

参考：http://daning.iteye.com/blog/165284

参考：http://blog.csdn.net/weijie_search/article/details/2662189

package pdfReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.UnsupportedEncodingException;

import java.io.Writer;

import org.apache.pdfbox.pdfparser.PDFParser;

import org.apache.pdfbox.pdmodel.PDDocument;

import org.apache.pdfbox.util.PDFTextStripper;

public class pdfReaderClass {

public static void main(String[] args)

{

System.out.println("Start...");

//System.out.println("Input the pdf document path:");

//String pdfFilePath = System.in.toString();

String pdfFilePath = "F:\\Eclipseworkspace\\read2.pdf";//为pdf路径赋默认值

System.out.println("The pdf file path is: " + pdfFilePath);

//将结果路径设置为原pdf文件路径

String txtFilePath = null;

if (pdfFilePath.length() > 4)

{

txtFilePath = pdfFilePath.substring(0, pdfFilePath.length() - 4) + ".txt";

}

else System.out.println("The pdf file path is invalid！");

String str=pdfReaderClass.getTextFromPDF(pdfFilePath); //获取pdf文件

File outputTxt = new File(txtFilePath);

// FileOutputStream fos = null;

//try {

//fos = new FileOutputStream(outputTxt);

//} catch (FileNotFoundException e) {

TODO Auto-generated catch block

//e.printStackTrace();

//}

// DataOutputStream out = new DataOutputStream(fos);

// try {

//out.writeUTF(str);

//} catch (IOException e) {

TODO Auto-generated catch block

//e.printStackTrace();

//}

Writer txtWriter = null;

try {

txtWriter = new OutputStreamWriter(new FileOutputStream(outputTxt), "UTF-8");

} catch (UnsupportedEncodingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

txtWriter.write(str);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

if (txtWriter != null) {

// 关闭输出流

try {

txtWriter.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// System.out.println(str);

System.out.println("The output file path is: " + txtFilePath);

System.out.println("Over!");

}

/**

* @param pdfFilePath file path

* @return all text in the pdf file

**/

public static String getTextFromPDF(String pdfFilePath) {

String result = null;

FileInputStream is = null;

PDDocument document = null;

try {

is = new FileInputStream(pdfFilePath);

PDFParser parser = new PDFParser(is);

parser.parse();

document = parser.getPDDocument();

PDFTextStripper stripper = new PDFTextStripper();

result = stripper.getText(document);

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

if (is != null) {

try {

is.close();

} catch (IOException e) {

// TODO Auto-generated catch block

System.out.println("The FileInputStream is null！");

e.printStackTrace();

}

}

if (document != null) {

try {

document.close();

} catch (IOException e) {

// TODO Auto-generated catch block

System.out.println("Fail to get the pdf document！");

e.printStackTrace();

}

}

}

return result;

}

}

遇到的问题：http://blog.csdn.net/lin9118/article/details/9309445