百度云OCR身份证识别

1.通用OCR文字识别

这种OCR只能按照识别图片中的文字，且是按照行识别返回结果，精度较低。

首先引入依赖包：

<dependency>
    <groupId>com.baidu.aip</groupId>
    <artifactId>java-sdk</artifactId>
    <version>4.6.0</version>
</dependency>

通过OCR工具类：

package util;

import com.baidu.aip.ocr.AipOcr;
import org.json.JSONObject;
import java.util.HashMap;


public class OcrApi {
    private static final String APP_ID = "你的 App ID";
    private static final String API_KEY = "Xb12m5t4jS2n7";
    private static final String SECRET_KEY = "9XVx9GPcSbSUTZ";

    private static AipOcr getAipClient() {
        return getAipClient(API_KEY, SECRET_KEY);
    }

    public static AipOcr getAipClient(String apiKey, String secretKey) {
        AipOcr client = new AipOcr(APP_ID, apiKey, secretKey);
        // 可选：设置网络连接参数
        client.setConnectionTimeoutInMillis(2000);
        client.setSocketTimeoutInMillis(60000);
        return client;
    }

    public static String result(AipOcr client) {
        // 传入可选参数调用接口
        HashMap<String, String> options = new HashMap<>();
        options.put("language_type", "CHN_ENG");
        options.put("detect_direction", "true");
        options.put("detect_language", "true");
        options.put("probability", "true");

        JSONObject res = client.basicGeneralUrl(
                "https://lichunyu1234.oss-cn-shanghai.aliyuncs.com/1.png", options);
        return res.toString(2);
    }

    public static void main(String[] args) {
        System.out.println(result(getAipClient()));
    }
}

结果如下，识别有两行信息（words即是识别的信息）：

 

2.高精度OCR识别身份证信息 

这种就比较高精度，且按照分类显示，返回数据更友好，高可用。

2.1 接口说明及请求参数是地址官方截图如下：

 

 2.2 OCR身份证识别工具类

package util;

import com.alibaba.druid.util.Base64;
import com.alibaba.fastjson.JSONObject;
import java.io.*;
import java.net.*;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;

public class OcrUtil {
    // Access_Token获取
    private static final String ACCESS_TOKEN_HOST = "https://aip.baidubce.com/oauth/2.0/token?";
    // 身份证识别请求URL
    private static final String OCR_HOST = "https://aip.baidubce.com/rest/2.0/ocr/v1/idcard?";
    // apiKey,secretKey
    private static final String API_KEY ="Xb12m5t4jS";
    private static final String SECRET_KEY = "9XVx9GPcSbSUT";


    // 获取百度云OCR的授权access_token
    public static String getAccessToken() {
        return getAccessToken(API_KEY, SECRET_KEY);
    }

    /**
     * 获取百度云OCR的授权access_token
     * @param apiKey
     * @param secretKey
     * @return
     */
    public static String getAccessToken(String apiKey, String secretKey) {
        String accessTokenURL = ACCESS_TOKEN_HOST
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + apiKey
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + secretKey;

        try {
            URL url = new URL(accessTokenURL);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();

            // 获取响应头
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "---->" + map.get(key));
            }

            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            StringBuilder result = new StringBuilder();
            String inputLine;
            while ((inputLine = bufferedReader.readLine()) != null) {
                result.append(inputLine);
            }
            JSONObject jsonObject = JSONObject.parseObject(result.toString());
            return jsonObject.getString("access_token");

        } catch (Exception e) {
            e.printStackTrace();
            System.err.print("获取access_token失败");
        }
        return null;
    }

    /**
     * 获取身份证识别后的数据
     * @param imageUrl
     * @param idCardSide
     * @return
     */
    public static String getStringIdentityCard(File imageUrl, String idCardSide) {
        // 身份证OCR的http URL+鉴权token
        String OCRUrl = OCR_HOST+"access_token="+getAccessToken();
        System.out.println(OCRUrl);
        System.out.println("***************************************************");
        System.out.println(getAccessToken());
        // 对图片进行base64处理
        String image = encodeImageToBase64(imageUrl);
        // 请求参数
        String requestParam = "detect_direction=true&id_card_side="+idCardSide+"&image="+image;

        try {
            // 请求OCR地址
            URL url = new URL(OCRUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            // 设置请求方法为POST
            connection.setRequestMethod("POST");

            // 设置请求头
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestProperty("apiKey", API_KEY);
            connection.setDoOutput(true);
            connection.getOutputStream().write(requestParam.getBytes(StandardCharsets.UTF_8));
            connection.connect();

            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), StandardCharsets.UTF_8));
            StringBuilder result = new StringBuilder();
            String inputLine;
            while ((inputLine = bufferedReader.readLine()) != null) {
                result.append(inputLine);
            }
            bufferedReader.close();
            return result.toString();
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("身份证OCR识别异常");
            return null;
        }
    }

    /**
     * 对图片url进行Base64编码处理
     * @param imageUrl
     * @return
     */
    public static String encodeImageToBase64(File imageUrl) {
        // 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        byte[] data = null;
        try {
            InputStream inputStream = new FileInputStream(imageUrl);
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();

            // 对字节数组Base64编码
            return URLEncoder.encode(Base64.byteArrayToBase64(data), "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

    }

    public static void main(String[] args) throws FileNotFoundException, MalformedURLException, URISyntaxException {
        File file = new File("D:\\图片\\证件照\\front.jpg");
        System.out.println(getStringIdentityCard(file,
                "front"));
    }

}

 

官方返回示例：

 

**********************************************

对于身份证识别有个大坑：

1.有的base64编码后有头部“Base64：”要去掉，阿里巴巴的base64可以正常使用。

2.OCR识别官方只说明图片要Base64编码，但是实际上还是要再UrlEncode再编码一次才可以。