此Java文章是基本聚合数据(https://www.juhe.cn/)-----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/...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/cardr...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/cardr...

// 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();  }