此java文章是基本聚合数据证件识别接口来演示，基本HTTP POST请求上传图片并接收JSON数据来处理。
使用前你需要通过
https://www.juhe.cn/docs/api/id/153
申请一个名片识别的appkey
1.支持的证件类型清单
请求地址:http://api2.juheapi.com/cardrecon/supportlist?key=您申请的appkey
此接口可通过GET请求得到结果,java网络请求有HttpClient相关工具包及HttpURLConnection相关的包等，这里用的是HttpClient，需要先导包，如果用maven话会更方便直接把:

<dependency><groupid>org.apache.httpcomponents</groupid>
<artifactid>httpmime</artifactid>
<version>4.3.6</version>
</dependency>
<dependency>
<groupid>org.apache.httpcomponents</groupid>
<artifactid>httpclient</artifactid>
<version>4.4.1</version>
</dependency>

复制到配置文件 pom.xml

请求代码如下：

public static String get() throws IOException {
        // 创建HttpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String result = null;
        try {
            HttpGet httpGet = new HttpGet("http://api2.juheapi.com/cardrecon/supportlist?key="+ appKey);
            // 执行网络请求
            response = httpClient.execute(httpGet);
            // 获取请求实体
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                // ConverStreamToString是下面写的一个方法是把网络请求的字节流转换为utf8的字符串
                result = ConvertStreamToString(resEntity.getContent(), "UTF-8");
            }
            EntityUtils.consume(resEntity);
        } catch (Exception e) {
        } finally {
            // 关闭请求
            response.close();
            httpClient.close();
        }
        // 得到的是JSON类型的数据需要第三方解析JSON的jar包来解析
        return result;
    }

2.证件图片识别
请求地址:http://api2.juheapi.com/cardrecon/upload

// 此方法是POST请求上传的参数中包含本地图片信息File类型
    public static String post(String type, File file) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String result = null;
        // HttpClient请求的相关设置，可以不用配置，用默认的参数，这里设置连接和超时时长(毫秒)
        RequestConfig config = RequestConfig.custom().setConnectTimeout(30000).setSocketTimeout(30000).build();
        try {
            HttpPost httppost = new HttpPost("http://api2.juheapi.com/cardrecon/upload");
            // FileBody封装File类型的参数
            FileBody bin = new FileBody(file);
            // StringBody封装String类型的参数
            StringBody keyBody = new StringBody(key, ContentType.TEXT_PLAIN);
            StringBody typeBody = new StringBody(type, ContentType.TEXT_PLAIN);
            // addPart将参数传入，并指定参数名称
            HttpEntity reqEntity = MultipartEntityBuilder.create()
                    .addPart("pic", bin).addPart("key", keyBody)
                    .addPart("cardType", typeBody).build();
            httppost.setEntity(reqEntity);
            httppost.setConfig(config);
            // 执行网络请求并返回结果
            response = httpClient.execute(httppost);
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                result = ConvertStreamToString(resEntity.getContent(), "UTF-8");
            }
            EntityUtils.consume(resEntity);
        } finally {
            response.close();
            httpClient.close();
        }
        // 得到的是JSON类型的数据需要第三方解析JSON的jar包来解析
        return result;
    }

    // 此方法是把传进的字节流转化为相应的字符串并返回，此方法一般在网络请求中用到
    public static String ConvertStreamToString(InputStream is, String charset)
            throws Exception {
        StringBuilder sb = new StringBuilder();
        try (InputStreamReader inputStreamReader = new InputStreamReader(is,charset)) {
            try (BufferedReader reader = new BufferedReader(inputStreamReader)) {
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line).append("\r\n");
                }
            }
        }
        return sb.toString();
    }