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，接口文档详见 https://ai.aliyun.com/ocr/card
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。
~~~~~~~~~~可以忽略~~~~~~~~~~~~~
发现一个不错的chatGPT网站，方便易用。
