SpringBoot 读取pdf中的文字内容

1、引入依赖

// 自行官网查看api 下载 jar 包 打入本地仓库
    <!--        百度 ocr-->
        <dependency>
            <groupId>com.baidu.api</groupId>
            <artifactId>java-sdk</artifactId>
            <version>4.15.8</version>
        </dependency>
            <!--        fontbox 开源免费 读取PDF-->

        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.24</version>
        </dependency>

        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>fontbox</artifactId>
            <version>2.0.24</version>
        </dependency>
      <!--pdf分割-->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.47</version>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcmail-jdk15on</artifactId>
            <version>1.47</version>
        </dependency>

新建一个测试类 ReadPdf.class

    public static final String API_KEY = "申请的百度 API_KEY";
    public static final String SECRET_KEY = "申请的百度 SECRET_KEY";

新建方法 ocrReadPdf

private static String ocrReadPdf(String path) throws Exception {
        String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/general_basic";

        String auth = getAuth(API_KEY, SECRET_KEY);

        byte[] imgData = FileUtil.readFileByBytes(path);
        String imgStr = Base64Util.encode(imgData);
        String imgParam = URLEncoder.encode(imgStr, "UTF-8");

        String param = "pdf_file=" + imgParam;

        String result = HttpUtil.post(url, auth, param);

        JSONObject jsonObject = new JSONObject(result);
        String words_result = jsonObject.getString("words_result");
        JSONArray jsonArray = null;
        StringBuffer s = new StringBuffer();
        try {
            jsonArray = new JSONArray(words_result);
            if (jsonArray != null) {
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonobject = jsonArray.getJSONObject(i);
                    String words = jsonobject.optString("words");
                    s.append(words);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }


        return s.toString();
    }

新建方法 getAuth

private static String getAuth(String ak, String sk) {
        // 获取token地址
        String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
        String getAccessTokenUrl = authHost
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + ak
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + sk;
        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
//            for (String key : map.keySet()) {
//                System.err.println(key + "--->" + map.get(key));
//            }
            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**
             * 返回结果示例
             */
//            System.err.println("result:" + result);
            JSONObject jsonObject = new JSONObject(result);
            String access_token = jsonObject.getString("access_token");
            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return null;
    }

新建方法 splitExistFile

private static void splitExistFile(String filePath, String fileName) {

 
        // 每个文件最大页数
        int filePageSize = 1;
        // 待拆分文件的总页数
        int totalPage;
        // 拆分后的文件数量
        int splitFileNum;
        int pageIndex = 1;
        PdfReader reader = null;
        try {
            String orignName = fileName.split("\\.")[0];
            reader = new PdfReader(filePath + fileName);
            PdfReader.unethicalreading = true;
            totalPage = reader.getNumberOfPages();
            splitFileNum = totalPage % filePageSize == 0 ? totalPage / filePageSize : totalPage / filePageSize + 1;
            for (int i = 0; i < splitFileNum; i++) {
                String newFileName = filePath + orignName + "_" + (i + 1) + ".pdf";
                System.out.println(newFileName);
                // 新建一个PDF文件
                Document document = null;
                PdfWriter writer = null;
                try {
                    document = new Document();
                    writer = PdfWriter.getInstance(document, new FileOutputStream(newFileName));
                    document.open();
                    PdfContentByte pdfContentByte = writer.getDirectContent();
                    for (int j = 0; j < filePageSize; j++) {
                        document.newPage();
                        pdfContentByte.addTemplate(writer.getImportedPage(reader, pageIndex), 0, 0);
                        pageIndex++;
                        if (pageIndex > totalPage)
                            break;

                    }
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (DocumentException e) {
                    e.printStackTrace();
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {

                    //这个地方要特别注意资源关闭的顺序
                    if (document != null)
                        document.close();

                    if (writer != null)
                        writer.close();

                }
                //        先切割再读取
                ocrReadPdf(filePath + fileName);
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) reader.close();
        }

    }

写个 main方法测试

public static void main(String[] args) throws Exception {
        String path = "文件路径";
        String fileName = "文件名称";
        splitExistFile(path, fileName);

    }

参考文章：

链接: 百度API OCR.
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