OCR技术之阿里云产品

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。

原文地址：https://www.cnblogs.com/zhizhixiaoxia/p/12017317.html