java通过百度AI开发平台提取身份证图片中的文字信息

废话不多说，直接上代码。。。

　　IdCardDemo.java

 package com.wulss.baidubce;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.util.Map;
 
 import com.wulss.utils.Base64Util;
 import com.wulss.utils.FileUtil;
 import com.wulss.utils.HttpUtil;
 
 /**
  *
  * @Descript TODO (身份证图片识别 案例)
  * @author yeting
  * @date 2019年4月18日
  *
  */
 public class IdCardDemo {
 
     private static final String URL_IDCARD = "https://aip.baidubce.com/rest/2.0/ocr/v1/idcard";//身份证识别地址
     private static final String URL_ACCESSTOKEN = "https://aip.baidubce.com/oauth/2.0/token?"; // 百度AI开发平台 获取token的地址
     private static final String API_KEY = "afdH343CAt342YFT7F";    // 百度AI开发平台 获取的 API Key 更新为你注册的
     private static final String SECRET_KEY = "js45sdfqRFF65gOd667sd1R7sdr"; // 百度AI开发平台 获取的 Secret Key 更新为你注册的
 
      /**
      * 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 static String getAccessToken() {
         String getAccessTokenUrl = URL_ACCESSTOKEN
                 + "grant_type = client_credentials" // 1. grant_type为固定参数
                 + "&client_id = " + API_KEY // 2. 官网获取的 API Key
                 + "&client_secret = " + SECRET_KEY; // 3. 官网获取的 Secret Key
         String accessToken = "";
         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;
             }
 
             System.err.println("result:" + result);
 
             org.json.JSONObject jsonObject = new org.json.JSONObject(result);
             accessToken = jsonObject.getString("access_token");
         } catch (Exception e) {
             System.err.printf("获取token失败！");
             e.printStackTrace(System.err);
         }
         return accessToken;
     }
 
     /**
      * 身份证识别请求
      * @param side 识别身份证正面 front;识别身份证背面 back;
      * @param filePath 图片路径
      * @param accessToken 线上环境有过期时间， 客户端可自行缓存，过期后重新获取。
      * @return 返回身份证号码
      */
     public static String requestIdCard(String side,String filePath,String accessToken) {
         String result = "";
 
         try {
             //1.请求获取结果
             String requestParams = "id_card_side = " + side
                     + "&" + URLEncoder.encode("image", "UTF-8")
                     + "=" + URLEncoder.encode(Base64Util.encode(FileUtil.readFileByBytes(filePath)), "UTF-8");
 
             result = HttpUtil.post(URL_IDCARD, accessToken, requestParams);//返回json格式的结果
             System.out.println(result);
 
             // 请求返回结果eg:
             // String result =
             //    "[{\"log_id\": 3812339812321238679, \"words_result_num\": 6,\"direction\": 2, \"image_status\": \"normal\",
             //         \"words_result\": {
             //             \"住址\":{\"location\": {\"width\": 123, \"top\": 123, \"height\": 4423, \"left\":1232}, \"words\": \"湖北省咸宁市茶叶巷\"},
             //             \"出生\": {\"location\":{\"width\": 333, \"top\": 339, \"height\": 2333, \"left\": 3333}, \"words\": \"19191010\"},
             //             \"姓名\": {\"location\": {\"width\": 133, \"top\": 309, \"height\": 303, \"left\": 2205}, \"words\": \"张三\"},
             //             \"公民身份号码\":{\"location\": {\"width\": 111, \"top\": 3333, \"height\": 3335, \"left\":333}, \"words\": \"430124191910101234\"},
             //             \"性别\": {\"location\": {\"width\":222, \"top\": 521, \"height\": 304, \"left\": 2333}, \"words\": \"男\"},
             //             \"民族\": {\"location\": {\"width\": 111, \"top\": 3333, \"height\": 22,\"left\": 1222}, \"words\": \"汉\"}
             //         }
             //     }]";
 
 //            <!-- json转换工具 依赖jar包-->
 //            <dependency>
 //                <groupId>net.sf.json-lib</groupId>
 //                <artifactId>json-lib</artifactId>
 //                <version>2.4</version>
 //                <classifier>jdk15</classifier>
 //            </dependency>
 
             //2.解析结果
             Map<String,String> resultMap = (Map<String,String>)net.sf.json.JSONObject
                                 .toBean(net.sf.json.JSONObject.fromObject(result),Map.class);
 
             if(resultMap.get("error_code").equals("110")) {
                 return requestIdCard(side,filePath,getAccessToken()) ;//重新请求
             }else {
                 String words = "";
                 if(resultMap.get("image_status") != null && resultMap.get("image_status").equals("normal")) {//    正常
                     String wordsResults = resultMap.get("words_result");
                     Map<String,String> wordsResultMap = (Map<String,String>)net.sf.json.JSONObject
                             .toBean(net.sf.json.JSONObject.fromObject(wordsResults),Map.class);
 
                     String idCardNums = wordsResultMap.get("公民身份号码");
                     Map<String,String> idCardNumMap = (Map<String,String>)net.sf.json.JSONObject
                             .toBean(net.sf.json.JSONObject.fromObject(idCardNums),Map.class);
                     words = idCardNumMap.get("words");
                 }
                 return words;
             }
         } catch (Exception e) {
             e.printStackTrace();
             result = e.getMessage();
         }
 
         return result;
     }
 
 }

　　FileUtil.java

 package com.wulss.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();
             }
         }
     }
 }

　　Base64Util.java

 package com.wulss.utils;
 
 /**
  * Base64 工具类
  */
 public class Base64Util {
     private static final char[] ALPHABET;
     private static final char last2byte;
     private static final char last4byte;
     private static final char last6byte;
     private static final char lead6byte;
     private static final char lead4byte;
     private static final char lead2byte;
     private static final char[] encodeTable;
     private static int[] toInt;
 
     static {
         ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
         last2byte = (char)Integer.parseInt("00000011", 2);
         last4byte = (char)Integer.parseInt("00001111", 2);
         last6byte = (char)Integer.parseInt("00111111", 2);
         lead6byte = (char)Integer.parseInt("11111100", 2);
         lead4byte = (char)Integer.parseInt("11110000", 2);
         lead2byte = (char)Integer.parseInt("11000000", 2);
         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', '+', '/' };
         Base64Util.toInt = new int[128];
         for (int i = 0; i < Base64Util.ALPHABET.length; ++i) {
             Base64Util.toInt[Base64Util.ALPHABET[i]] = i;
         }
     }
     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();
     }
 
     public static byte[] decode(final String s) {
         final int delta = s.endsWith("==") ? 2 : (s.endsWith("=") ? 1 : 0);
         final byte[] buffer = new byte[s.length() * 3 / 4 - delta];
         final int mask = 255;
         int index = 0;
         for (int i = 0; i < s.length(); i += 4) {
             final int c0 = Base64Util.toInt[s.charAt(i)];
             final int c2 = Base64Util.toInt[s.charAt(i + 1)];
             buffer[index++] = (byte)((c0 << 2 | c2 >> 4) & mask);
             if (index >= buffer.length) {
                 return buffer;
             }
             final int c3 = Base64Util.toInt[s.charAt(i + 2)];
             buffer[index++] = (byte)((c2 << 4 | c3 >> 2) & mask);
             if (index >= buffer.length) {
                 return buffer;
             }
             final int c4 = Base64Util.toInt[s.charAt(i + 3)];
             buffer[index++] = (byte)((c3 << 6 | c4) & mask);
         }
         return buffer;
     }
 }

　　HttpUtil.java

 package com.wulss.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;
     }
 }