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AI人工智能:JAVA教你拍照识别文字 并语音播报

2020-08-12    
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背景:

日常个人学习或者公司业务中,需要将书籍或者纸质文件转换成电子文稿,最近刚刚做完这一功能,在这里分享给大家

由于本人主要是做后台数据开发,所以主要讲解后台代码,如有不足,还请多喷

首先,在文字识别这一块,百度是做的比较好的,我们就以他为例,每天可以免费使用500次,作为普通人的日常使用,足矣。如果你是企业使用,那就乖乖给钱吧

步骤一:到百度云申请AppID 以及secret id,如有不会,请自行摆渡哈

步骤二:再根据获得的appID 以及secret id,获得token,代码如下:

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;

/** * 获取token类 */public class AuthService {

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

    /**     * 获取权限token     * @return 返回示例:     * {     * "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",     * "expires_in": 2592000     * }     */    public static String getAuth() {
        // 官网获取的 API Key 更新为你注册的        String clientId = "KxiVCwBc7T9UU9C9p8qSNqlb";
        // 官网获取的 Secret Key 更新为你注册的        String clientSecret = "WcT9Zx5G5XFZ5GyRvuLGZ0nmEfRf5pzp";
        return getAuth(clientId, clientSecret);
    }

    /**     * 获取API访问token     * 该token有一定的有效期,需要自行管理,当失效时需重新获取.     * @param ak - 百度云官网获取的 API Key     * @param sk - 百度云官网获取的 Secret Key     * @return assess_token 示例:     * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"     */    public 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;
    }

}

步骤三:有了以上两个步骤,就可以写代码进行识别啦,话不多说,直接上代码

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(){        // 请求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 {
            // 本地文件路径            //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";            // 注意这里仅为了简化编码每一次请求都去获取access_token,线上环境access_token有过期时间, 客户端可自行缓存,过期后重新获取。            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 工具类 */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);
        // 打开和URL之间的连接        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        // 设置通用的请求属性        connection.setRequestProperty("Content-Type", contentType);
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setUseCaches(false);
        connection.setDoOutput(true);
        connection.setDoInput(true);

        // 得到请求的输出流对象        DataOutputStream out = new DataOutputStream(connection.getOutputStream());
        out.write(params.getBytes(encoding));
        out.flush();
        out.close();

        // 建立实际的连接        connection.connect();
        // 获取所有响应头字段        Map<String, List<String>> headers = connection.getHeaderFields();
        // 遍历所有的响应头字段        for (String key : headers.keySet()) {
            System.err.println(key + "--->" + headers.get(key));
        }
        // 定义 BufferedReader输入流来读取URL的响应        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.*;

/** * 文件读取工具类 */public class FileUtil {

    /**     * 读取文件内容,作为字符串返回     */    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()));
        // 创建字节输入流        FileInputStream fis = new FileInputStream(filePath);
        // 创建一个长度为10240的Buffer        byte[] bbuf = new byte[10240];
        // 用于保存实际读取的字节数        int hasRead = 0;
        while ( (hasRead = fis.read(bbuf)) > 0 ) {
            sb.append(new String(bbuf, 0, hasRead));
        }
        fis.close();
        return sb.toString();
    }

    /**     * 根据文件路径读取byte[] 数组     */    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 工具类 */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();
    }
}

下面给出语音播报内容:pom中添加依赖,如果不成功,请下载后,用maven自行导入

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>

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

下面上代码:

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;

/*将jacob-1.17-M2-x86.dll添加到JDK的bin目录和windows的system32目录(64位系统添加jacob-1.17-M2-x64.dll) * * * * */public class VoiceAnnouncements {
    public static void main(String[] args) {
        try {
            StringBuilder stringbuilder = new StringBuilder();
            //创建Scanner对象,接受从控制台输入            Scanner scanner = new Scanner(System.in);
            String m = "-1";
            //如果输入的是“t”,则结束服务            while (!"t".equalsIgnoreCase(stringbuilder.toString())) {
                System.out.println("请输入需要语音播报的内容:");
                read("请输入需要语音播报的内容");

                while (true) {
                    String text = scanner.nextLine().trim();
                    if ("".equals(text)) {
                        break;
                    }
                    stringbuilder.append(text);
                }
                if (stringbuilder.toString().endsWith("t")) {
                    System.out.println("感谢使用");
                    read("感谢使用");
                    break;
                } else {
                    System.err.println("需要播报的输入内容为:"+stringbuilder.toString());

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

    /**     * 根据字符串进行语音播报     * 问题:为什么方法为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));
        // 语音朗读速度 -10 到 +10        sap.setProperty("Rate", new Variant(0));
        // 获取执行对象        Dispatch sapo = sap.getObject();
        // 执行朗读        Dispatch.call(sapo, "Speak", new Variant(str));
                    /*// 关闭执行对象                    sapo.safeRelease();                    // 关闭应用程序连接                    sap.safeRelease();*/    }
}通过以上步骤,应该可以正确运行文字识别,并语音播报了,似不似很方便。

通过以上步骤,应该可以正确运行文字识别,并语音播报了,似不似很方便。

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