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
<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
<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
@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;
}
//getBase64FromInputStream代码，把MultipartFile 转为base64
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
<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
@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
/**
* 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。
@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：
@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！
now ,fight for future
