背景：

日常個人學習或者公司業務中，需要將書籍或者紙質文件轉換成電子文稿，最近剛剛做完這一功能，在這里分享給大家

由于本人主要是做后臺數據開發，所以主要講解后臺代碼，如有不足，還請多噴

首先，在文字識別這一塊，百度是做的比較好的，我們就以他為例，每天可以免費使用500次，作為普通人的日常使用，足矣。如果你是企業使用，那就乖乖給錢吧

步驟一：到百度云申請AppID 以及secret id,如有不會，請自行擺渡哈

步驟二：再根據獲得的appID 以及secret id,獲得token，代碼如下：

import org.json.JSONObject;

import JAVA.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/** * 獲取token類 */public class AuthService {

    public static void main(String[] args) {
        getAuth();
    }

    /**     * 獲取權限token     * @return 返回示例：     * {     * "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",     * "expires_in": 2592000     * }     */    public static String getAuth() {
        // 官網獲取的 API Key 更新為你注冊的        String clientId = "KxiVCwBc7T9UU9C9p8qSNqlb";
        // 官網獲取的 Secret Key 更新為你注冊的        String clientSecret = "WcT9Zx5G5XFZ5GyRvuLGZ0nmEfRf5pzp";
        return getAuth(clientId, clientSecret);
    }

    /**     * 獲取API訪問token     * 該token有一定的有效期，需要自行管理，當失效時需重新獲取.     * @param ak - 百度云官網獲取的 API Key     * @param sk - 百度云官網獲取的 Secret Key     * @return assess_token 示例：     * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"     */    public static String getAuth(String ak, String sk) {
        // 獲取token地址        String authHost = "https://aip.baidubce.com/oauth/2.0/token?";

        String getAccessTokenUrl = authHost
                // 1. grant_type為固定參數                + "grant_type=client_credentials"                // 2. 官網獲取的 API Key                + "&client_id=" + ak
                // 3. 官網獲取的 Secret Key                + "&client_secret=" + sk;
        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打開和URL之間的連接            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            // 獲取所有響應頭字段            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍歷所有的響應頭字段            for (String key : map.keySet()) {
                System.err.println(key + "--->" + map.get(key));
            }
            // 定義 BufferedReader輸入流來讀取URL的響應            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**             * 返回結果示例             */            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("獲取token失敗！");
            e.printStackTrace(System.err);
        }
        return null;
    }

}

步驟三：有了以上兩個步驟，就可以寫代碼進行識別啦，話不多說，直接上代碼

import java.net.URLEncoder;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.springframework.web.servlet.ModelAndView;

import static com.lin.practice.voice_announcements.VoiceAnnouncements.read;


@Controllerpublic class ImgController {
    //public static void main(String[] args) {     //   test();   // }    @ResponseBody    @RequestMapping(value = "/ocr", method = RequestMethod.POST)
    public JSONObject test(@RequestPart(value = "file", required = false) MultipartFile file) {
        ModelAndView mav = new ModelAndView("index");
        //public static JSONObject test(){        // 請求url        String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic";//https://aip.baidubce.com/rest/2.0/ocr/v1/idcard,https://aip.baidubce.com/rest/2.0/ocr/v1/driving_license        String result = "";
        JSONObject parseobject = null;
        try {
            // 本地文件路徑            //String filePath = "C:\Users\mayn\Desktop\1596726642(1).png";                     byte[] imgData = file.getBytes();
            //byte[] imgData = FileUtil.readFileByBytes(filePath);            String imgStr = Base64Util.encode(imgData);
            String imgParam = URLEncoder.encode(imgStr, "UTF-8");

            String param = "image=" + imgParam;
//            String param = "image=" + imgParam+"&id_card_side=front";            // 注意這里僅為了簡化編碼每一次請求都去獲取access_token，線上環境access_token有過期時間， 客戶端可自行緩存，過期后重新獲取。            String accessToken = "24.25af24d873386e07025e113c44750dc1.2592000.1599316725.282335-21835341";
            result = HttpUtil.post(url, accessToken, param);
            parseObject = JSONArray.parseObject(result);

            System.out.println(result);
            read(result);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return parseObject;
    }
}

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/** * http 工具類 */public class HttpUtil {

    public static String post(String requestUrl, String accessToken, String params)
            throws Exception {
        String contentType = "application/x-www-form-urlencoded";
        return HttpUtil.post(requestUrl, accessToken, contentType, params);
    }

    public static String post(String requestUrl, String accessToken, String contentType, String params)
            throws Exception {
        String encoding = "UTF-8";
        if (requestUrl.contains("nlp")) {
            encoding = "GBK";
        }
        return HttpUtil.post(requestUrl, accessToken, contentType, params, encoding);
    }

    public static String post(String requestUrl, String accessToken, String contentType, String params, String encoding)
            throws Exception {
        String url = requestUrl + "?access_token=" + accessToken;
        return HttpUtil.postGeneralUrl(url, contentType, params, encoding);
    }

    public static String postGeneralUrl(String generalUrl, String contentType, String params, String encoding)
            throws Exception {
        URL url = new URL(generalUrl);
        // 打開和URL之間的連接        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        // 設置通用的請求屬性        connection.setRequestProperty("Content-Type", contentType);
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setUseCaches(false);
        connection.setDoOutput(true);
        connection.setDoInput(true);

        // 得到請求的輸出流對象        DataOutputStream out = new DataOutputStream(connection.getOutputStream());
        out.write(params.getBytes(encoding));
        out.flush();
        out.close();

        // 建立實際的連接        connection.connect();
        // 獲取所有響應頭字段        Map<String, List<String>> headers = connection.getHeaderFields();
        // 遍歷所有的響應頭字段        for (String key : headers.keySet()) {
            System.err.println(key + "--->" + headers.get(key));
        }
        // 定義 BufferedReader輸入流來讀取URL的響應        BufferedReader in = null;
        in = new BufferedReader(
                new InputStreamReader(connection.getInputStream(), encoding));
        String result = "";
        String getLine;
        while ((getLine = in.readLine()) != null) {
            result += getLine;
        }
        in.close();
        System.err.println("result:" + result);
        return result;
    }
}

import java.io.*;

/** * 文件讀取工具類 */public class FileUtil {

    /**     * 讀取文件內容，作為字符串返回     */    public static String readFileAsString(String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException(filePath);
        }

        if (file.length() > 1024 * 1024 * 1024) {
            throw new IOException("File is too large");
        }

        StringBuilder sb = new StringBuilder((int) (file.length()));
        // 創建字節輸入流        FileInputStream fis = new FileInputStream(filePath);
        // 創建一個長度為10240的Buffer        byte[] bbuf = new byte[10240];
        // 用于保存實際讀取的字節數        int hasRead = 0;
        while ( (hasRead = fis.read(bbuf)) > 0 ) {
            sb.append(new String(bbuf, 0, hasRead));
        }
        fis.close();
        return sb.toString();
    }

    /**     * 根據文件路徑讀取byte[] 數組     */    public static byte[] readFileByBytes(String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException(filePath);
        } else {
            ByteArrayOutputStream bos = new ByteArrayOutputStream((int) file.length());
            BufferedInputStream in = null;

            try {
                in = new BufferedInputStream(new FileInputStream(file));
                short bufSize = 1024;
                byte[] buffer = new byte[bufSize];
                int len1;
                while (-1 != (len1 = in.read(buffer, 0, bufSize))) {
                    bos.write(buffer, 0, len1);
                }

                byte[] var7 = bos.toByteArray();
                return var7;
            } finally {
                try {
                    if (in != null) {
                        in.close();
                    }
                } catch (IOException var14) {
                    var14.printStackTrace();
                }

                bos.close();
            }
        }
    }
}

/** * Base64 工具類 */public class Base64Util {
    private static final char last2byte = (char) Integer.parseInt("00000011", 2);
    private static final char last4byte = (char) Integer.parseInt("00001111", 2);
    private static final char last6byte = (char) Integer.parseInt("00111111", 2);
    private static final char lead6byte = (char) Integer.parseInt("11111100", 2);
    private static final char lead4byte = (char) Integer.parseInt("11110000", 2);
    private static final char lead2byte = (char) Integer.parseInt("11000000", 2);
    private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};

    public Base64Util() {
    }

    public static String encode(byte[] from) {
        StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);
        int num = 0;
        char currentByte = 0;

        int i;
        for (i = 0; i < from.length; ++i) {
            for (num %= 8; num < 8; num += 6) {
                switch (num) {
                    case 0:
                        currentByte = (char) (from[i] & lead6byte);
                        currentByte = (char) (currentByte >>> 2);
                    case 1:
                    case 3:
                    case 5:
                    default:
                        break;
                    case 2:
                        currentByte = (char) (from[i] & last6byte);
                        break;
                    case 4:
                        currentByte = (char) (from[i] & last4byte);
                        currentByte = (char) (currentByte << 2);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);
                        }
                        break;
                    case 6:
                        currentByte = (char) (from[i] & last2byte);
                        currentByte = (char) (currentByte << 4);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);
                        }
                }

                to.append(encodeTable[currentByte]);
            }
        }

        if (to.length() % 4 != 0) {
            for (i = 4 - to.length() % 4; i > 0; --i) {
                to.append("=");
            }
        }

        return to.toString();
    }
}

下面給出語音播報內容：pom中添加依賴，如果不成功，請下載后，用maven自行導入

命令如下： mvn install:install-file -Dfile=cloud.jar（本地包名） -DgroupId=com.hope.cloud -DartifactId=cloud -Dversion=1.0 -Dpackaging=jar

<dependency>
    <groupId>com.jacob</groupId>
    <artifactId>jacob</artifactId>
    <version>1.10</version>
 </dependency>

另外需要下載jacob-1.17-M2-x86.dll，并添加到JDK的bin目錄

下面上代碼：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

import com.jacob.com.Dispatch;
import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.Variant;

/*將jacob-1.17-M2-x86.dll添加到JDK的bin目錄和windows的system32目錄（64位系統添加jacob-1.17-M2-x64.dll） * * * * */public class VoiceAnnouncements {
    public static void main(String[] args) {
        try {
            StringBuilder stringbuilder = new StringBuilder();
            //創建Scanner對象，接受從控制臺輸入            Scanner scanner = new Scanner(System.in);
            String m = "-1";
            //如果輸入的是“t”,則結束服務            while (!"t".equalsIgnoreCase(stringbuilder.toString())) {
                System.out.println("請輸入需要語音播報的內容：");
                read("請輸入需要語音播報的內容");

                while (true) {
                    String text = scanner.nextLine().trim();
                    if ("".equals(text)) {
                        break;
                    }
                    stringbuilder.append(text);
                }
                if (stringbuilder.toString().endsWith("t")) {
                    System.out.println("感謝使用");
                    read("感謝使用");
                    break;
                } else {
                    System.err.println("需要播報的輸入內容為："+stringbuilder.toString());

                    //播報                    read(stringbuilder.toString());
                    /**                     * 清空字符串                     */                    stringbuilder.delete(0, stringbuilder.length());
                    read("播報結束");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }
    }

    /**     * 根據字符串進行語音播報     * 問題：為什么方法為static     * @param str     */    public static void read(String str) {
        ActiveXComponent sap = new ActiveXComponent("Sapi.SpVoice");
        // 音量 0-100        sap.setProperty("Volume", new Variant(100));
        // 語音朗讀速度 -10 到 +10        sap.setProperty("Rate", new Variant(0));
        // 獲取執行對象        Dispatch sapo = sap.getObject();
        // 執行朗讀        Dispatch.call(sapo, "Speak", new Variant(str));
                    /*// 關閉執行對象                    sapo.safeRelease();                    // 關閉應用程序連接                    sap.safeRelease();*/    }
}通過以上步驟，應該可以正確運行文字識別，并語音播報了，似不似很方便。

通過以上步驟，應該可以正確運行文字識別，并語音播報了，似不似很方便。