<dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>1.8.13</version>
        </dependency>

快速開始

本示例是將指定目錄下的PDF文件中的信息讀取出來，存儲到新的指定路徑的txt文本文件當中。

class PdfTest {

    public static void main(String[] args) throws Exception {
       String filePath ="C:\\Users\\Admin\\Desktop\\cxy1.pdf";
   
        List<String> list = getFiles(basePath);
        for (String filePath : list) {
            long ltime = System.currentTimeMillis();
            String substring = filePath.substring(filePath.lastIndexOf("\\") + 1, filePath.lastIndexOf("."));
            String project = "（juejin.cn）";
            String textFromPdf = getTextFromPdf(filePath);
            String s = writterTxt(textFromPdf, substring + "--", ltime, basePath);
            StringBuffer stringBuffer = readerText(s, project);
            writterTxt(stringBuffer.toString(), substring + "-", ltime, basePath);
        }
        System.out.println("******************** end ************************");
    }

    public static List<String> getFiles(String path) {
        List<String> files = new ArrayList<String>();
        File file = new File(path);
        File[] tempList = file.listFiles();

        for (int i = 0; i < tempList.length; i++) {
            if (tempList[i].isFile()) {
                if (tempList[i].toString().contains(".pdf") || tempList[i].toString().contains(".PDF")) {
                    files.add(tempList[i].toString());
                }
                //文件名，不包含路徑
                //String fileName = tempList[i].getName();
            }
            if (tempList[i].isDirectory()) {
                //這里就不遞歸了，
            }
        }
        return files;
    }

    public static String getTextFromPdf(String filePath) throws Exception {
        String result = null;
        FileInputStream is = null;
        PDDocument document = null;
        try {
            is = new FileInputStream(filePath);
            PDFParser parser = new PDFParser(is);
            parser.parse();
            document = parser.getPDDocument();
            PDFTextStripper stripper = new PDFTextStripper();
            result = stripper.getText(document);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (document != null) {
                try {
                    document.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        Map<String, String> map = new HashMap<String, String>();
        return result;
    }


    public static String writterTxt(String data, String text, long l, String basePath) {
        String fileName = null;
        try {
            if (text == null) {
                fileName = basePath + "javaio-" + l + ".txt";
            } else {
                fileName = basePath + text + l + ".txt";
            }

            File file = new File(fileName);
            //if file doesnt exists, then create it
            if (!file.exists()) {
                file.createNewFile();
            }
            //true = append file
            OutputStream outputStream = new FileOutputStream(file);
//            FileWriter fileWritter = new FileWriter(file.getName(), true);
//            fileWritter.write(data);
//            fileWritter.close();
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
            outputStreamWriter.write(data);
            outputStreamWriter.close();
            outputStream.close();
            System.out.println("Done");
        } catch (IOException e) {
            e.printStackTrace();
        }

        return fileName;
    }

    public static StringBuffer readerText(String name, String project) {
        // 使用ArrayList來存儲每行讀取到的字符串
        StringBuffer stringBuffer = new StringBuffer();
        try {
            FileReader fr = new FileReader(name);
            BufferedReader bf = new BufferedReader(fr);
            String str;
            // 按行讀取字符串
            while ((str = bf.readLine()) != null) {
                str = replaceAll(str);
                if (str.contains("D、") || str.contains("D.")) {
                    stringBuffer.append(str);
                    stringBuffer.append("\n");
                    stringBuffer.append("參考： \n");
                    stringBuffer.append("參考： \n");
                    stringBuffer.append("\n\n\n\n");
                } else if (str.contains("A、") || str.contains("A.")) {
                    stringBuffer.deleteCharAt(stringBuffer.length() - 1);
                    stringBuffer.append("。" + project + "\n");
                    stringBuffer.append(str + "\n");
                } else if (str.contains("B、") || str.contains("C、") || str.contains("B.") || str.contains("C.")) {
                    stringBuffer.append(str + "\n");
                } else {
                    stringBuffer.append(str);
                }

            }
            bf.close();
            fr.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return stringBuffer;
    }

    public static String replaceAll(String str) {
        return str.replaceAll("網", "");
    }
}