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;
    }
}