String filePath = "[本地文件路径]";
byte[] imgData = FileUtil.readFileByBytes(filePath);
String imgStr = Base64Util.encode(imgData);
String imgParam = URLEncoder.encode(imgStr, "UTF-8");
String param = "max_face_num=" + 5 + "&face_fields=" + "age,beauty,expression,faceshape,gender,glasses,landmark,race,qualities" + "&image=" + imgParam;
String accessToken = "[调用鉴权接口获取的token]";
String result = HttpUtil.post(url, accessToken, param);
System.out.println(result);
大概类似这样