• 百度ocr接口,Future限制调用的响应时间


    一、百度提供的工具类

    1.HttpUtil

    package com.baidu.ai.aip.utils;
    
    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;
        }
    }
    View Code

    2.FileUtil

    package com.baidu.ai.aip.utils;
    
    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();
                }
            }
        }
    }
    View Code

    3.Base64Util

    package com.baidu.ai.aip.utils;
    
    /**
     * 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();
        }
    }
    View Code

    4.GsonUtils

    /*
     * Copyright (C) 2017 Baidu, Inc. All Rights Reserved.
     */
    package com.baidu.ai.aip.utils;
    
    import com.google.gson.Gson;
    import com.google.gson.GsonBuilder;
    import com.google.gson.JsonParseException;
    
    import java.lang.reflect.Type;
    
    /**
     * Json工具类.
     */
    public class GsonUtils {
        private static Gson gson = new GsonBuilder().create();
    
        public static String toJson(Object value) {
            return gson.toJson(value);
        }
    
        public static <T> T fromJson(String json, Class<T> classOfT) throws JsonParseException {
            return gson.fromJson(json, classOfT);
        }
    
        public static <T> T fromJson(String json, Type typeOfT) throws JsonParseException {
            return (T) gson.fromJson(json, typeOfT);
        }
    }
    View Code

    二、ocr接口调用

    import com.alibaba.fastjson.JSON;import io.swagger.annotations.Api;
    import io.swagger.annotations.ApiParam;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.URLEncoder;
    import java.util.Calendar;
    import java.util.concurrent.*;
    
    @Slf4j
    @RestController
    @RequestMapping(value = "api/ocr")
    @Api(value = "百度ocr接口", description = "百度ocr接口")
    public class BaiDuOcrController {
    
    
        @Autowired
        private BaiduOcrToken ocr;
    
        private JSONObject auth;
        private long expireDate;
        private int limitTime = 5700;
    
    
       /* @PostConstruct
        public void initOcrToken() {
            initOcrAuth();
        }*/
    
        /**
         * 初次调用或已经过期,初始化百度ocr调用权限
         */
        public void initOcrAuth() {
            log.info("初次调用或已经过期,初始化百度ocr调用权限Accesstoken开始");
            auth = getAuth(ocr.getClientId(), ocr.getClientSecret());
            log.info("初始化百度ocr调用权限Accesstoken成功 : 
    " + auth);
    
            String expiresIn = auth.getString("expires_in");
            Calendar calendar = Calendar.getInstance();
            calendar.add(Calendar.SECOND, Integer.valueOf(expiresIn));
    
            expireDate = calendar.getTimeInMillis();
            log.info("初始化百度ocr调用权限Accesstoken成功,过期时间 ======= " + expireDate);
        }
    
    
        /**
         * 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 Securet Key
         * @return assess_token 示例:
         * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"
         */
        public JSONObject getAuth(String ak, String sk) {
            // 获取token地址
            String authHost = ocr.getOcrAuthApi();
            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 {
                // 打开和URL之间的连接
                HttpURLConnection connection = FileHelper.getHttpURLConnection(getAccessTokenUrl);
                connection.setRequestMethod("POST");
                connection.connect();
    
                // 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 */
                JSONObject jo = JSON.parseObject(result);
                return jo;
            } catch (Exception e) {
                log.error("获取百度ocr访问权限token失败!", e);
            }
            return null;
        }
    
    
        @RequestMapping(value = "auth", method = RequestMethod.GET)
        public Result<Boolean> ocrAccessToken() {
    
            if(expireDate == 0 || System.currentTimeMillis() >= expireDate) {
                initOcrAuth();
            }
    
            return Result.success().result(true);
        }
    
    
        @RequestMapping(value = "idcard", method = RequestMethod.POST)
        public Result<String> idcard(@ApiParam(value = "front:身份证含照片的一面;back:身份证带国徽的一面") String idCardSide,
                                     @ApiParam(value = "身份证url地址")String imgUrl) throws Exception {
    
            Future<String> future = null;
            try {
    
                future = ConcurrentUtil.getThreadPool().submit( () -> {
                    byte[] imgData = FileHelper.readBytesByUrl(imgUrl);
                    String imgStr = Base64Util.encode(imgData);
                    String imgParam = URLEncoder.encode(imgStr, "UTF-8");
    
                    String param = "id_card_side=" + idCardSide + "&image=" + imgParam + "&detect_direction=true";
    
                    // 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 = auth.getString("access_token");
    
                    String result = HttpUtil.post(ocr.getIdcardApi(), accessToken, param);
    
                    return result;
                });
    
                String result = future.get(limitTime, TimeUnit.MILLISECONDS);
    
                return Result.success().result(result);
    
            } catch (Exception  e) {
                if(future != null)
                    future.cancel(true);
                log.error("身份证识别失败, url为 : {}", imgUrl);
                throw e;
            }
        }
    
    
        @RequestMapping(value = "bankCard", method = RequestMethod.POST)
        public Result<String> bankCard(@ApiParam(value = "银行卡url地址") String imgUrl) throws Exception {
    
            Future<String> future = null;
            try {
    
                future = ConcurrentUtil.getThreadPool().submit( () -> {
    
                    byte[] imgData = FileHelper.readBytesByUrl(imgUrl);
                    String imgStr = Base64Util.encode(imgData);
                    String imgParam = URLEncoder.encode(imgStr, "UTF-8");
    
                    String param = "image=" + imgParam;
    
                    // 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 = auth.getString("access_token");
    
                    String result = HttpUtil.post(ocr.getBankcardApi(), accessToken, param);
    
                    return result;
                });
    
                String result = future.get(limitTime, TimeUnit.MILLISECONDS);
    
                return Result.success().result(result);
    
            } catch (Exception  e) {
                if(future != null)
                    future.cancel(true);
                log.error("银行卡识别失败, url为 : {}", imgUrl);
                throw e;
            }
        }
    
    
        @RequestMapping(value = "businessLicense", method = RequestMethod.POST)
        public Result businessLicense(@ApiParam(value = "营业执照url地址") String imgUrl) throws Exception {
    
            Future<String> future = null;
            try {
    
    
                /*Callable<String> callable = new Callable<String>() {
                    @Override
                    public String call() throws Exception {
    
                        return "";
                    }
                };
    
                FutureTask<String> futureTask = new FutureTask<>(callable);*/
    
    
                future = ConcurrentUtil.getThreadPool().submit( () -> {
    
                    byte[] imgData = FileHelper.readBytesByUrl(imgUrl);
                    String imgStr = Base64Util.encode(imgData);
                    String imgParam = URLEncoder.encode(imgStr, "UTF-8");
    
                    String param = "image=" + imgParam + "&detect_direction=true";//&accuracy=high";
    
                    // 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 = auth.getString("access_token");
    
                    String result = HttpUtil.post(ocr.getLicenseApi(), accessToken, param);
                    return result;
                });
                //加上前端请求时间限制在6s,超过强制返回结果,取消识别
                String result = future.get(limitTime, TimeUnit.MILLISECONDS);
    
                return Result.success().result(result);
    
            } catch (Exception  e) {
                if(future != null)
                    future.cancel(true);
                log.error("营业执照识别失败, url为 : {}", imgUrl);
                throw e;
            }
        }
    
        @RequestMapping(value = "words", method = RequestMethod.POST)
        public Result words(String imgUrl) throws Exception {
    
            String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/general";
    
            String param = "url=" + imgUrl + "&detect_direction=true";
            // 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 = auth.getString("access_token");
    
            String result = HttpUtil.post("https://aip.baidubce.com/rest/2.0/ocr/v1/general", accessToken, param);
    
            return Result.success().result(result);
        }
    
    }

    根据url读取图片内容:

    HttpURLConnection -> conn.getContentLength();图片内容长度
    /**
         * 根据ali oss url读取文件字节
         * @param imgUrl
         * @return
         * @throws IOException
         */
        public static byte[] readBytesByUrl(String imgUrl) throws IOException {
    
            String limitUrl = FileHelper.limit500KbImgUrl(imgUrl);
            HttpURLConnection conn = FileHelper.getHttpURLConnection(limitUrl);
            InputStream ins = FileHelper.getInputStreaFromConnection(conn);
    
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            BufferedInputStream bis;
    
            try {
                bis = new BufferedInputStream(ins);
                short bufSize = 1024;
                byte[] buffer = new byte[bufSize];
                int len1;
                while (-1 != (len1 = bis.read(buffer, 0, bufSize))) {
                    bos.write(buffer, 0, len1);
                }
    
                byte[] bytes = bos.toByteArray();
                return bytes;
            } finally {
                try {
                    if (ins != null) {
                        ins.close();
                    }
                } catch (IOException var14) {
                    ;
                }
    
                bos.close();
            }
        }

    ……

     百度api地址

    JAVA Future类详解

    详解Java中的Future、FutureTask的原理以及与线程池的搭配使用

    .

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  • 原文地址:https://www.cnblogs.com/foolash/p/12168251.html
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