OCR识别行驶证(阿里云和百度云)

一、使用场景

1、通过识别行驶证，获取相关汽车信息，替代手输

二、效果图

三、代码部分：

1、阿里云OCR

1.1、控制层

@PostMapping("/ocrCard")
public JSONObject ocrCard(@RequestPart("file") MultipartFile file, String type){
    //正面为face，反面为back
    JSONObject jsonObject = OcrUtils.ocrCard(file,type);
    return jsonObject;
}

1.2、OcrUtils工具类

public class OcrUtils {

    public static final String host = "https://driving.market.alicloudapi.com";

    public static final String path = "/rest/160601/ocr/ocr_vehicle.json";

    public static final String appcode = "替换成自己申请的";

	/**
	* type是前端传值，face为正面，face为反面
	*/
    public static JSONObject ocrCard(MultipartFile file,String type){
        String imgBase64 = encodeImageToBase64(file);
        JSONObject jsonObject = new JSONObject();
        //如果文档的输入中含有inputs字段，设置为True， 否则设置为False
        Boolean is_old_format = false;
        //请根据线上文档修改configure字段
        JSONObject configObj = new JSONObject();
        configObj.put("side", type);
        String config_str = configObj.toString();
        String method = "POST";
        Map<String, String> headers = new HashMap<String, String>();
        //header中的格式
        headers.put("Authorization", "APPCODE " + appcode);
        Map<String, String> querys = new HashMap<String, String>();
        // 拼装请求body的json字符串
        JSONObject requestObj = new JSONObject();
        try {
            if(is_old_format) {
                JSONObject obj = new JSONObject();
                obj.put("image", getParam(50, imgBase64));
                if(config_str.length() > 0) {
                    obj.put("configure", getParam(50, config_str));
                }
                JSONArray inputArray = new JSONArray();
                inputArray.add(obj);
                requestObj.put("inputs", inputArray);
            }else{
                requestObj.put("image", imgBase64);
                if(config_str.length() > 0) {
                    requestObj.put("configure", config_str);
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        String bodys = requestObj.toString();
        try {
            HttpResponse response = HttpUtils.doPost(host, path, method, headers, querys, bodys);
            int stat = response.getStatusLine().getStatusCode();
            if(stat != 200){
                System.out.println("Http code: " + stat);
                System.out.println("http header error msg: "+ response.getFirstHeader("X-Ca-Error-Message"));
                System.out.println("Http body error msg:" + EntityUtils.toString(response.getEntity()));
                return jsonObject;
            }
            String res = EntityUtils.toString(response.getEntity());
            JSONObject res_obj = JSON.parseObject(res);
            if(is_old_format) {
                JSONArray outputArray = res_obj.getJSONArray("outputs");
                String output = outputArray.getJSONObject(0).getJSONObject("outputValue").getString("dataValue");
                JSONObject out = JSON.parseObject(output);
                return out;
            }else{
                return res_obj;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return jsonObject;
    }

    /*
     * 获取参数的json对象
     */
    public static JSONObject getParam(int type, String dataValue) {
        JSONObject obj = new JSONObject();
        try {
            obj.put("dataType", type);
            obj.put("dataValue", dataValue);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return obj;
    }

    private static String encodeImageToBase64(MultipartFile file) {
        try {
            byte[] content = file.getBytes();
            return new String(encodeBase64(content));
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }
}

2、百度云OCR

2.1、控制层

@PostMapping("/ocrCardBd")
public JSONObject ocrCardBd(@RequestPart("file") MultipartFile file,String type){
   JSONObject jsonObject = OcrBdUtils.ocrCard(file,type);
   return jsonObject;
}

2.2、OcrBdUtils工具类

public class OcrBdUtils {

    public static final String apiKey = "替换成自己的";

    public static final String secretKey = "替换成自己的";

    public static final String tokenUrl = "https://aip.baidubce.com/oauth/2.0/token";

    public static final String apiUrl = "https://aip.baidubce.com/rest/2.0/ocr/v1/vehicle_license";
    

	/**
	* type是前端传值，front为正面(默认)，back为反面
	*/
    public static JSONObject ocrCard(MultipartFile file, String type) {
        try {
            String accessToken = getAccessToken();
            String apiEndpoint = apiUrl + "?access_token=" + accessToken;
            // 获取文件字节数组并进行Base64编码
            byte[] fileBytes = file.getBytes();
            String imgStr = Base64Util.encode(fileBytes);
            String imgParam = URLEncoder.encode(imgStr, "UTF-8");
            // 构造请求的URL和参数
            URL url = new URL(apiEndpoint);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoOutput(true);
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            // 发送请求参数
            String postData = "image=" + imgParam + "&vehicle_license_side=" + type;
            connection.getOutputStream().write(postData.getBytes());
            // 获取响应
            InputStream inputStream = connection.getInputStream();
            String response = readStream(inputStream);
           
            return JSONObject.parseObject(response);
        } catch (IOException e) {
            e.printStackTrace();
            return new JSONObject();
        }
    }

 	// 获取令牌
    public static String getAccessToken() throws IOException {
        URL url = new URL(tokenUrl + "?grant_type=client_credentials&client_id=" + apiKey + "&client_secret=" + secretKey);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");

        InputStream responseStream = connection.getInputStream();
        String response = StreamUtils.copyToString(responseStream, java.nio.charset.StandardCharsets.UTF_8);

        JSONObject jsonObject = JSONObject.parseObject(response);
        return jsonObject.getString("access_token");
    }

    // 读取输入流的内容
    private static String readStream(InputStream inputStream) throws IOException {
        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            return outputStream.toString();
        }
    }
}

一个在学习中的开发者，勿喷，欢迎交流