OCR识别

最近作者项目中用到了身份证识别跟营业执照的OCR识别，就研究了一下腾讯云和百度云的OCR产品接口。

腾讯云OCR

收费：身份证OCR和营业执照OCR接口，每个接口每个月各有1000次的免费调用

身份证-OCR

1.引入腾讯的SDK及JSON

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<dependency>            <groupId>com.tencentcloudapi</groupId>            <artifactId>tencentcloud-sdk-java</artifactId>            <version>3.0.58</version>    </dependency>        <dependency>            <groupId>net.sf.json-lib</groupId>            <artifactId>json-lib</artifactId>            <version>2.4</version>            <classifier>jdk15</classifier>     </dependency>

2.前端ocr.html代码　

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<form action="/ocr/uploadFile" method="POST" enctype="multipart/form-data">     <input type="file" name="file">     <br />     <input type="radio" name="card_side" value="FRONT"> 正面            <input type="radio" name="card_side" value="BACK"> 反面     <br />     <input type="submit" value="提交">         </form>

3.后端代码

说明：new Credential("secretId","secretKey"),这两个参数在腾讯云控制台申请

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@Controller @RequestMapping("/ocr") public class OcrController {       @GetMapping("/index")     public String index(){         return "ocr";     }       @PostMapping("uploadFile")     @ResponseBody     public IDCardOCRResponse OCRIdCardTest(@RequestParam(value = "file") MultipartFile file, @RequestParam(value = "card_side") String cardSize, Model model){         try {             Credential cred = new Credential("AKIDfxxxx", "qSq9Fxxxxx");               HttpProfile httpProfile = new HttpProfile();             httpProfile.setEndpoint("ocr.tencentcloudapi.com");               ClientProfile clientProfile = new ClientProfile();             clientProfile.setHttpProfile(httpProfile);               OcrClient client = new OcrClient(cred, "ap-beijing", clientProfile);             Map<String, String> params = new HashMap<>();             params.put("ImageBase64", getBase64FromInputStream(file.getInputStream()));             params.put("CardSide", cardSize);               IDCardOCRRequest req = IDCardOCRRequest.fromJsonString(JSONObject.fromObject(params).toString(), IDCardOCRRequest.class);             IDCardOCRResponse resp = client.IDCardOCR(req);             return resp;         } catch (Exception e) {             e.printStackTrace();         }         return null;       }<br>    //<strong>getBase64FromInputStream代码，把MultipartFile 转为base64</strong>     public static String getBase64FromInputStream(InputStream in) {         // 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;         // 读取图片字节数组         try {             ByteArrayOutputStream swapStream = new ByteArrayOutputStream();             byte[] buff = new byte[100];             int rc = 0;             while ((rc = in.read(buff, 0, 100)) > 0) {                 swapStream.write(buff, 0, rc);             }             data = swapStream.toByteArray();         } catch (IOException e) {             e.printStackTrace();         } finally {             if (in != null) {                 try {                     in.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }         return new String(Base64.encodeBase64(data));     } }

运行前端html码，选择身份证图片，点击提交就可以返回身份证的信息了。　　

营业执照-OCR

1.前端html代码

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<form action="/ocr/bizlicense" method="POST" enctype="multipart/form-data">    <input type="file" name="file">    <br />    <input type="submit" value="提交">  </form>

2.后端代码

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@PostMapping("bizlicense")   @ResponseBody   public String OCRBizlicenseTest(@RequestParam(value = "file") MultipartFile file) throws Exception{         RestTemplate restTemplate = new RestTemplate();         String apiUrl="https://recognition.image.myqcloud.com/ocr/bizlicense";         HttpHeaders headers = new HttpHeaders();         headers.set("host", "recognition.image.myqcloud.com");         headers.set("content-type", "application/json");         String authorization=QQOCRSignUtils.appSign(XXXX, "AKIDGQfhYTqEs0DXXX", "7adThzEEH6mKXXX", "", 10L);         headers.set("authorization",authorization );                  JSONObject params = new JSONObject();         params.put("appid", "XXX");         params.put("image", getBase64FromInputStream(file.getInputStream()));         HttpEntity<JSONObject> entity = new HttpEntity<JSONObject>(params, headers);         HttpEntity<String> response  = restTemplate.postForEntity(apiUrl, entity, String.class);         return response.getBody();   }

3.　QQOCRSignUtils.appSign

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/**  * 生成 Authorization 签名字段  */ public static String appSign(long appId, String secretId, String secretKey, String bucketName,      　 long expired) throws Exception {    　　 long now = System.currentTimeMillis() / 1000;    　　 int rdm = Math.abs(new Random().nextInt());    　　 String plainText = String.format("a=%d&b=%s&k=%s&t=%d&e=%d&r=%d", appId, bucketName,             secretId, now, now + expired, rdm);   　　  byte[] hmacDigest = HmacSha1(plainText, secretKey);   　　  byte[] signContent = new byte[hmacDigest.length + plainText.getBytes().length];   　　  System.arraycopy(hmacDigest, 0, signContent, 0, hmacDigest.length);   　　  System.arraycopy(plainText.getBytes(), 0, signContent, hmacDigest.length,             plainText.getBytes().length);   　　  return Base64Encode(signContent); }

运行前端html码，选择营业执照图片，点击提交就可以返回营业执照的信息了。

百度云OCR

通过以下步骤创建OCR应用，作者当时在这一步花了很长时间

 

 

 

创建完之后就可以拿到appId，API Key，Secret Key，就可以调用百度提供的api了

收费：身份证OCR和营业执照OCR接口，每个接口每天各有500次的免费调用

身份证-OCR ：

只列出后端的代码，前端代码跟腾讯的一样，只不过前后面身份证枚举值不一样，参考接口文档说明。

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@PostMapping("ocridcard") @ResponseBody public String OCRIdCardTest(@RequestParam(value = "file") MultipartFile file,@RequestParam(value = "card_side") String cardSize,Model model){   try {     　　RestTemplate restTemplate = new RestTemplate();    　　 HttpEntity<String> response =  restTemplate.postForEntity("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=XXXXXX&client_secret=XXXXXX",null,String.class);   　　  JSONObject jsonObject = JSONObject.fromObject(response.getBody());  　　   System.out.println(response.getBody());  　　   String accessToken = jsonObject.getString("access_token");         　　  String apiUrl="https://aip.baidubce.com/rest/2.0/ocr/v1/idcard?access_token="+accessToken;     　  HttpHeaders headers = new HttpHeaders();         headers.set("content-type", "application/x-www-form-urlencoded");                   MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();         params.add("detect_direction", "true");         params.add("id_card_side", cardSize);         params.add("image", Base64Utils.getBase64FromInputStream(file.getInputStream()));         params.add("detect_risk", "true");         System.out.println(Base64Utils.getBase64FromInputStream(file.getInputStream()));         System.out.println(URLDecoder.decode(URLEncoder.encode(Base64Utils.getBase64FromInputStream(file.getInputStream()),"UTF-8"),"UTF-8"));         HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<>(params, headers);         response  = restTemplate.postForEntity(apiUrl, entity, String.class);         return response.getBody();   } catch (Exception e) {     e.printStackTrace();   }   return null; }

营业执照-OCR：

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@PostMapping("ocrbusinesslicense") @ResponseBody public String OCRBusinessLicenseTest(@RequestParam(value = "file") MultipartFile file,Model model){   try {  　　   RestTemplate restTemplate = new RestTemplate(); 　　    HttpEntity<String> response =  restTemplate.postForEntity("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=XXXXX&client_secret=XXXXXX",null,String.class);  　　   JSONObject jsonObject = JSONObject.fromObject(response.getBody());  　　   System.out.println(response.getBody());  　　   String accessToken = jsonObject.getString("access_token");           　　String apiUrl="https://aip.baidubce.com/rest/2.0/ocr/v1/business_license?access_token="+accessToken;    　　 HttpHeaders headers = new HttpHeaders();         headers.set("content-type", "application/x-www-form-urlencoded");                   MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();         params.add("detect_direction", "true");         params.add("image", Base64Utils.getBase64FromInputStream(file.getInputStream()));              System.out.println(Base64Utils.getBase64FromInputStream(file.getInputStream()));         System.out.println(URLDecoder.decode(URLEncoder.encode(Base64Utils.getBase64FromInputStream(file.getInputStream()),"UTF-8"),"UTF-8"));         HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<>(params, headers);         response  = restTemplate.postForEntity(apiUrl, entity, String.class);         return response.getBody();      } catch (Exception e) {     e.printStackTrace();   }   return null; }

多了解百度云和腾讯云官网，官网里面有很多api可以调用，有详细代码！