OCR技术之阿里云产品

Posted 2021-03-24 zhizhixiaoxia

OCR技术，开源免费的技术产品之前小编已经写过，想看请点击 https://www.cnblogs.com/zhizhixiaoxia/p/12015657.html

没事研究了下阿里云收费的OCR技术产品。

以身份证识别为例，代码调用接口实现：（idea编写的Java，maven项目）

1、所需依赖：

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.3</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
  　 <version>1.2.15</version>
</dependency>
<dependency>
    <groupId>commons-lang</groupId>
    <artifactId>commons-lang</artifactId>
    <version>2.6</version>
</dependency>

依赖版本可自行去maven仓库选择下载。

2、需要创建两个类，一个是目标类，一个是http工具类。

目标类:

public class AliyunOcr {

    public static void main(String[] args){
        //idCardIdentify();
    }

    /**
     * 身份证识别
     * */
    private static void idCardIdentify() {
        // 接口访问路径
        String host = "http://dm-51.data.aliyun.com";
        // 接口请求方式风格
        String path = "/rest/160601/ocr/ocr_idcard.json";
        // 产品编码
        String appcode = "开通服务获取";
        // 图片路径
        String imgFile = "E://com//dream//begin//image//jpg//idCard//1_3.jpg";
        // 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();
        // 身份证正反面参数 front正面，back反面
        configObj.put("side", "back");
        String config_str = configObj.toString();
        // 请求方式
        String method = "POST";
        Map<String, String> headers = new HashMap<String, String>();
        // 最后在header中的格式(中间是英文空格)为Authorization:APPCODE 83359fd73fe94948385f570e3c139105
        headers.put("Authorization", "APPCODE " + appcode);
　　　　 // url后面的请求参数
        Map<String, String> querys = new HashMap<String, String>();

        // 对图像进行base64编码
        InputStream inputStream = null;
        byte[] data = null;
        try {
            inputStream = new FileInputStream(imgFile);
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 编码加密
        BASE64Encoder encoder = new BASE64Encoder();
        String imgBase64 = encoder.encode(data);
        // 拼装请求body的json字符串
        JSONObject requestObj = new JSONObject();
        try {
　　　　　　  // 判断文档输入中是否含有inputs字段
            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();
        }
　　　　 // 请求体
        String bodys = requestObj.toString();
        try {
            // 发送请求，识别图片
            HttpResponse response = AliyunHttpUtils.doPost(host, path, method, headers, querys, bodys);
            // 请求状态码
            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;
            }
            // 获取返回数据
            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);
　　　　　　　　   // 打印返回结果 
                System.out.println(out.toJSONString());
            }else{
                System.out.println(res_obj.toJSONString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取参数的json对象
     **/
    private 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;
    }

}

http工具类:：

public class AliyunHttpUtils {
    /**
     * Post String
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @param body
     * @return
     * @throws Exception
     */
    public static HttpResponse doPost(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys,
                                      String body)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        if (StringUtils.isNotBlank(body)) {
            request.setEntity(new StringEntity(body, "utf-8"));
        }

        return httpClient.execute(request);
    }
    
    private static String buildUrl(String host, String path, Map<String, String> querys) throws UnsupportedEncodingException {
        StringBuilder sbUrl = new StringBuilder();
        sbUrl.append(host);
        if (!StringUtils.isBlank(path)) {
            sbUrl.append(path);
        }
        if (null != querys) {
            StringBuilder sbQuery = new StringBuilder();
            for (Map.Entry<String, String> query : querys.entrySet()) {
                if (0 < sbQuery.length()) {
                    sbQuery.append("&");
                }
                if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
                    sbQuery.append(query.getValue());
                }
                if (!StringUtils.isBlank(query.getKey())) {
                    sbQuery.append(query.getKey());
                    if (!StringUtils.isBlank(query.getValue())) {
                        sbQuery.append("=");
                        sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
                    }
                }
            }
            if (0 < sbQuery.length()) {
                sbUrl.append("?").append(sbQuery);
            }
        }

        return sbUrl.toString();
    }

    private static HttpClient wrapClient(String host) {
        HttpClient httpClient = new DefaultHttpClient();
        if (host.startsWith("https://")) {
            sslClient(httpClient);
        }

        return httpClient;
    }

    private static void sslClient(HttpClient httpClient) {
        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            X509TrustManager tm = new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(X509Certificate[] xcs, String str) {

                }
                public void checkServerTrusted(X509Certificate[] xcs, String str) {

                }
            };
            ctx.init(null, new TrustManager[] { tm }, null);
            SSLSocketFactory ssf = new SSLSocketFactory(ctx);
            ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            ClientConnectionManager ccm = httpClient.getConnectionManager();
            SchemeRegistry registry = ccm.getSchemeRegistry();
            registry.register(new Scheme("https", 443, ssf));
        } catch (KeyManagementException ex) {
            throw new RuntimeException(ex);
        } catch (NoSuchAlgorithmException ex) {
            throw new RuntimeException(ex);
        }
    }
}

工具类我删除了一些没用到的方法，如有想看完整的请去下载 https://github.com/aliyun/api-gateway-demo-sign-java/blob/master/src/main/java/com/aliyun/api/gateway/demo/util/HttpUtils.java。

 

总的来说，阿里云接口的使用，还是很简单的。希望对大伙们能有所帮助。

本人学疏才浅，如有差错，望请指正。