首先要在 face++ 注册一个账号，并且创建一个应用，拿到 api key 和 api secret；

下载 java 接入工具，一个 jar 包：https://github.com/FacePlusPlus/facepp-java-sdk

请求返回的数据是 json 格式，需要导入 json 解析包：

commons-beanutils-1.8.3.jar
commons-lang-2.5.jar
commons-collections-3.2.2.jar
ezmorph-1.0.6.jar
json-lib-2.3-jdk15.jar

图片上传类：FileUpLoad.java

 package com.krry;

 import java.io.File;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.List;

 import java.util.UUID;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.fileupload.FileItem;

 import org.apache.commons.fileupload.FileItemFactory;

 import org.apache.commons.fileupload.disk.DiskFileItemFactory;

 import org.apache.commons.fileupload.servlet.ServletFileUpload;

 /**

  *  FileUpLoad

  * @author krry

  *

  */

 @WebServlet(name="fileUp",urlPatterns={"/show"})

 public class FileUpLoad extends HttpServlet{

     private static final long serialVersionUID = 1L;

     @Override

     public void service(HttpServletRequest request,HttpServletResponse response) throws IOException{

         //判断是不是文件上传，根据请求包里面的内容是否为二进制提交的上传的文件 true/false

         boolean isMultPart = ServletFileUpload.isMultipartContent(request);

         if(isMultPart){

             //创建文件上传工厂

             FileOutputStream out = null;

             InputStream in = null;

             try {

                  FileItemFactory factory = new DiskFileItemFactory();

                  //创建容器文件类，负责处理上传的文件数据

                 ServletFileUpload upload = new ServletFileUpload(factory);

                  //解析上传文件,其实就是解析表单传过来的数据

                 List<FileItem> fileItems = upload.parseRequest(request);

                 //只需要拿一张图片

                 in = fileItems.get(0).getInputStream();

                 //获取源文件名

                 String Ofilename = fileItems.get(0).getName();

                 //拿到后缀名

                 String ext = Ofilename.substring(Ofilename.indexOf("."), Ofilename.length());

                 //拿到一个目录，绝对地址

                 String path =request.getSession().getServletContext().getRealPath("/");

                 //生成一个唯一的名字

                 String fileName = UUID.randomUUID().toString() + ext;

                 //定义上传目录

                 String dirPath = path+"/upload";

                 File dirFile = new File(dirPath);

                 //如果此文件夹不存在

                 if(!dirFile.exists()){

                     dirFile.mkdirs();//创建此文件夹

                 }

                 //配置文件路径

                 String filePath = path+"/upload/"+fileName;

                 //输出流

                 out = new FileOutputStream(filePath);

                 //边读取边编写 字节流

                 byte[] b = new byte[1024];

                 int length = 0;

                 while((length = in.read(b)) != -1){  //读到字节数组里面去

                     out.write(b,0,length);   //从0开始写，写你读了多少

                 }

                 //放在request作用域里

                 request.setAttribute("imgSrc", filePath);

                 request.setAttribute("imgSrcPage", "upload/"+fileName);

                 //请求转发，转发到另一个servlet

                 request.getRequestDispatcher("showImage").forward(request, response);

             } catch (Exception e) {

                 e.printStackTrace();

             }finally{

                 out.close();

                 in.close();

             }

         }

     }

 }

人脸识别类：Analysis.java

这里返回一个 json 字符串，放到作用域，在前台获取

 package com.krry;

 import java.io.ByteArrayOutputStream;

 import java.io.DataOutputStream;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.net.HttpURLConnection;

 import java.net.URL;

 import java.net.URLEncoder;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import java.util.Random;

 import java.util.TreeMap;

 import javax.net.ssl.SSLException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import net.sf.json.JSONArray;

 import net.sf.json.JSONObject;

 /**

  *  analysis

  * @author krry

  * String 转json 需要的jar包：版本不能弄错

  * commons-beanutils-1.8.3.jar

     commons-lang-2.5.jar

     commons-collections-3.2.2.jar

     ezmorph-1.0.6.jar

     json-lib-2.3-jdk15.jar

  */

 @WebServlet(name="analysis",urlPatterns={"/showImage"})

 public class Analysis extends HttpServlet{

     private static final long serialVersionUID = 1L;

     @Override

     public void service(HttpServletRequest request,HttpServletResponse response) throws IOException{

         //获取上传的图片地址

         String imgPath = request.getAttribute("imgSrc").toString();

         File file = new File(imgPath);

         byte[] buff = getBytesFromFile(file);

         String url = "https://api-cn.faceplusplus.com/facepp/v3/detect";

         HashMap<String, String> map = new HashMap<String, String>();

         HashMap<String, byte[]> byteMap = new HashMap<String, byte[]>();

         map.put("api_key", "15N9eBF_ieE-N2nvI7oK_A9anh2meuUS");

         map.put("api_secret", "cBnvsIAo8VaOj53lXCWlpuOSd0NrsFif");

         map.put("return_landmark", "1");

         map.put("return_attributes", "gender,age,smiling,headpose,facequality,blur,eyestatus,emotion,ethnicity,beauty,mouthstatus,eyegaze,skinstatus");

         byteMap.put("image_file", buff);

         try{

             byte[] bacd = post(url, map, byteMap);

             String str = new String(bacd);

             JSONObject json = JSONObject.fromObject(str);

             JSONArray faces = json.getJSONArray("faces");

             //解析失败

             if(str.indexOf("error_message") != -1 || faces.size() == 0){

                 request.getSession().setAttribute("error", "解析失败，请重新选择");

                 //重定向到首页

                 response.sendRedirect("index.jsp");

             }else{

                 //将人脸信息字符串str信息放到作用域

                 request.setAttribute("face", str);

                 //请求转发，返回到页面

                 request.getRequestDispatcher("showImage.jsp").forward(request, response);

             }

         }catch (Exception e) {

             e.printStackTrace();

         }

     }

     private final static int CONNECT_TIME_OUT = 30000;

     private final static int READ_OUT_TIME = 50000;

     private static String boundaryString = getBoundary();

     protected static byte[] post(String url, HashMap<String, String> map, HashMap<String, byte[]> fileMap) throws Exception {

         HttpURLConnection conne;

         URL url1 = new URL(url);

         conne = (HttpURLConnection) url1.openConnection();

         conne.setDoOutput(true);

         conne.setUseCaches(false);

         conne.setRequestMethod("POST");

         conne.setConnectTimeout(CONNECT_TIME_OUT);

         conne.setReadTimeout(READ_OUT_TIME);

         conne.setRequestProperty("accept", "*/*");

         conne.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundaryString);

         conne.setRequestProperty("connection", "Keep-Alive");

         conne.setRequestProperty("user-agent", "Mozilla/4.0 (compatible;MSIE 6.0;Windows NT 5.1;SV1)");

         DataOutputStream obos = new DataOutputStream(conne.getOutputStream());

         Iterator iter = map.entrySet().iterator();

         while(iter.hasNext()){

             Map.Entry<String, String> entry = (Map.Entry) iter.next();

             String key = entry.getKey();

             String value = entry.getValue();

             obos.writeBytes("--" + boundaryString + "\r\n");

             obos.writeBytes("Content-Disposition: form-data; name=\"" + key

                     + "\"\r\n");

             obos.writeBytes("\r\n");

             obos.writeBytes(value + "\r\n");

         }

         if(fileMap != null && fileMap.size() > 0){

             Iterator fileIter = fileMap.entrySet().iterator();

             while(fileIter.hasNext()){

                 Map.Entry<String, byte[]> fileEntry = (Map.Entry<String, byte[]>) fileIter.next();

                 obos.writeBytes("--" + boundaryString + "\r\n");

                 obos.writeBytes("Content-Disposition: form-data; name=\"" + fileEntry.getKey()

                         + "\"; filename=\"" + encode(" ") + "\"\r\n");

                 obos.writeBytes("\r\n");

                 obos.write(fileEntry.getValue());

                 obos.writeBytes("\r\n");

             }

         }

         obos.writeBytes("--" + boundaryString + "--" + "\r\n");

         obos.writeBytes("\r\n");

         obos.flush();

         obos.close();

         InputStream ins = null;

         int code = conne.getResponseCode();

         try{

             if(code == 200){

                 ins = conne.getInputStream();

             }else{

                 ins = conne.getErrorStream();

             }

         }catch (SSLException e){

             e.printStackTrace();

             return new byte[0];

         }

         ByteArrayOutputStream baos = new ByteArrayOutputStream();

         byte[] buff = new byte[4096];

         int len;

         while((len = ins.read(buff)) != -1){

             baos.write(buff, 0, len);

         }

         byte[] bytes = baos.toByteArray();

         ins.close();

         return bytes;

     }

     private static String getBoundary() {

         StringBuilder sb = new StringBuilder();

         Random random = new Random();

         for(int i = 0; i < 32; ++i) {

             sb.append("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-".charAt(random.nextInt("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_".length())));

         }

         return sb.toString();

     }

     private static String encode(String value) throws Exception{

         return URLEncoder.encode(value, "UTF-8");

     }

     public static byte[] getBytesFromFile(File f) {

         if (f == null) {

             return null;

         }

         try {

             FileInputStream stream = new FileInputStream(f);

             ByteArrayOutputStream out = new ByteArrayOutputStream(1000);

             byte[] b = new byte[1000];

             int n;

             while ((n = stream.read(b)) != -1)

                 out.write(b, 0, n);

             stream.close();

             out.close();

             return out.toByteArray();

         } catch (IOException e) {

         }

         return null;

     }

 }

解析 json 字符串，先转换成 json 格式，json 数组，一个个获取人脸属性

 <%@page import="net.sf.json.JSONObject"%>

 <%@page import="net.sf.json.JSONArray"%>

 <%@ page language="java" import="java.io.File" pageEncoding="utf-8"%>

 <%@page import="java.math.BigDecimal"%>

 <%@ page import="java.util.*" %>

 <%

     String path = request.getContextPath();

     int port = request.getServerPort();

     String basePath = null;

     if(port==80){

         basePath = request.getScheme()+"://"+request.getServerName()+path;

     }else{

         basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;

     }

     pageContext.setAttribute("basePath", basePath);

     Object str = request.getAttribute("face");

     JSONObject json = JSONObject.fromObject(str);

     JSONArray faces = json.getJSONArray("faces");

     StringBuffer strBuff = new StringBuffer();

     //识别出人脸的个数

     int length = faces.size();

     //识别出多少个人脸，就是循环多少次

     for(int i = 0;i < length;i++){

         JSONObject face = faces.getJSONObject(i);  //拿到第i+1个人脸部信息

         JSONObject attribute = face.getJSONObject("attributes");//拿到脸部属性

         //年龄

         JSONObject age = attribute.getJSONObject("age");

         int ageValue = age.getInt("value");

         //性别

         JSONObject gender = attribute.getJSONObject("gender");

         String sex = gender.getString("value");

         if(sex.equals("Male")) sex = "男";

         else sex = "女";

         //人种

         JSONObject ethnicity = attribute.getJSONObject("ethnicity");

         String races = ethnicity.getString("value");

         if(races.equals("Asian")) races = "亚洲人";

         else if(races.equals("White")) races = "白人";

         else races = "黑人";

         //微笑程度

         JSONObject smile = attribute.getJSONObject("smile");

         String smileRange = String.format("%.2f",smile.getDouble("value"));

         //表情

         JSONObject emotion = attribute.getJSONObject("emotion");

         Map<String,Double> mapp = new TreeMap<String,Double>();

         //装配表情信息到map

         double sadness = emotion.getDouble("sadness");

         mapp.put("伤心", sadness);

         double neutral = emotion.getDouble("neutral");

         mapp.put("平静", neutral);

         double disgust = emotion.getDouble("disgust");

         mapp.put("厌恶", disgust);

         double anger = emotion.getDouble("anger");

         mapp.put("愤怒", anger);

         double happiness = emotion.getDouble("happiness");

         mapp.put("高兴", happiness);

         double surprise = emotion.getDouble("surprise");

         mapp.put("惊讶", surprise);

         double fear = emotion.getDouble("fear");

         mapp.put("恐惧", fear);

         //利用list取最大值

         List<Double> listmap = new ArrayList<Double>();

         for(String key:mapp.keySet()){

             listmap.add(mapp.get(key));

         }

         //取到最大值

         double valueMax = Collections.max(listmap);

         //根据map的value获取map的key

         String emotionMax = "";

         for (Map.Entry<String, Double> entry : mapp.entrySet()) {

             if(valueMax == entry.getValue()){

                 emotionMax = entry.getKey();

             }

         }

         //颜值分数

         JSONObject beauty = attribute.getJSONObject("beauty");

         String beautys = "";

         if(sex.equals("男")) beautys = String.format("%.2f",beauty.getDouble("male_score"));

         else beautys = String.format("%.2f",beauty.getDouble("female_score"));

         //面部状态

         JSONObject skinstatus = attribute.getJSONObject("skinstatus");

         Map<String,String> mapSkin = new TreeMap<String,String>();

         //装配信息到map

         double health = skinstatus.getDouble("health");

         mapSkin.put("健康指数", String.format("%.2f",health));

         double stain = skinstatus.getDouble("stain");

         mapSkin.put("色斑指数", String.format("%.2f",stain));

         double acne = skinstatus.getDouble("acne");

         mapSkin.put("青春痘指数", String.format("%.2f",acne));

         double dark_circle = skinstatus.getDouble("dark_circle");

         mapSkin.put("黑眼圈指数", String.format("%.2f",dark_circle));

         strBuff.append("<br>");

         strBuff.append("<span>年龄：").append(ageValue).append("岁</span>");

         strBuff.append("<span>性别：").append(sex).append("</span>");

         strBuff.append("<br>").append("<br>");

         strBuff.append("<span>人种：").append(races+"</span>");

         strBuff.append("<span>微笑程度：").append(smileRange+"%</span>");

         strBuff.append("<br>").append("<br>");

         strBuff.append("<span>表情：").append(emotionMax+"</span>");

         strBuff.append("<span>颜值分数：").append(beautys+"</span>");

         strBuff.append("<br>").append("<br>");

         int counts = 0;

         for(String key:mapSkin.keySet()){

             counts++;

             strBuff.append("<span>"+key+"：").append(mapSkin.get(key)+"</span>");

             if(counts % 2 == 0) strBuff.append("<br>").append("<br>");

         }

         strBuff.append("<br>");

     }

 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

   <head>

     <title> Java开发人脸特征识别系统  --krry</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

     <meta http-equiv="description" content="This is my page">

     <style type="text/css">

          *{padding:0px;margin:0px;}

          body{background: #FFF;background:url("images/78788.jpg");background-size:cover;}

          .a_btn{text-decoration:none;font-family:"幼圆";background:#fff;transition:.6s;color:#f60;cursor:pointer;width:100px;height:40px;border-radius:10px;display: inline-block;text-align:center;line-height:40px;}

         .aa{position: absolute;left: 48px;top: 31px;}

         .a_btn:hover{background:red;color:#fff;transition:.6s;}

          .clear{clear:both;}

          .title{margin-top: 25px;font-size:48px;font-family:"幼圆";color: #ff7272;text-shadow: 1px 1px 3px #ff3737;text-align:center;line-height:45px;}

          .content{margin:0 auto;width:900px;}

           .content .img{float:left;margin-top:30px;}

           .content .img img{border-radius:10px;}

          .content .describe{margin-top:30px;width:500px;color:#000;font-family:"幼圆";font-size:18px;float:right;}

          .content .describe span{width: 190px;display: inline-block;}

     </style>

   </head>

   <body>

           <div class="aa"><a class="a_btn" href="${basePath}">返回</a></div>

           <div class="title">人脸识别结果</div>

           <div class="content">

             <div class = "img">

                <img style="float:left" width="350" src="${imgSrcPage}" />

             </div>

             <div style="float:right" class="describe"><%=strBuff.toString() %></div>

             <div class="clear"></div>

         </div>

   </body>

 </html>

首页：

 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 <%

     Object ermsg = request.getSession().getAttribute("error");

     StringBuffer strBuff = new StringBuffer();

     if(ermsg != null){

         //清除作用域

         request.getSession().removeAttribute("error");

         strBuff.append("loading('"+ermsg+"',4)");

     }

 %>

 <!doctype html>

 <html>

     <head>

        <meta http-equiv="Content-Type" content="text/html;charset=utf-8">

        <meta name="keywords" content="关键词,关键词">

        <meta name="description" content="">

        <link rel="stylesheet" type="text/css" href="css/sg.css" />

        <link rel="stylesheet" type="text/css" href="css/sg/css/animate.css" />

        <link rel="stylesheet" type="text/css" href="css/sg/css/sg.css" />

        <title> Java开发人脸特征识别系统  --krry</title>

        <style type="text/css">

            *{padding:0px;margin:0px;}

            body{background:url("images/5.jpg");background-size:cover;font-size:18px;font-family:"微软雅黑";color:#666;}

            img{border:none;}

            h1{font-size:24px;}

            .title{margin-top: 30px;font-size:48px;font-family:"幼圆";color: #ff7272;text-shadow: 1px 1px 3px #ff3737;text-align:center;line-height:45px;}

            .box{margin:100px auto;text-align:center;}

            .box .b_btn{width:100px;height:40px;background:#fff;transition:.6s;font-size:16px;font-family:"微软雅黑";display:block;margin:54px auto;text-align:center;

                        cursor:pointer;line-height:40px;text-decoration:none;color:#F60;border:1px;border-radius:12px}

               .box .b_btn:hover{background:red;color:#fff;transition:.6s;}

               .busbu{top:0;background:rgba(0, 0, 0, 0.2);display:none;width:100%;height:100%;position:absolute;z-index:1000;}

        </style>

     </head>

 <body>

    <!--action  提交的路径  method:post(打包传输) get(明文传输) enctype(采用二进制)-->

    <form action="show" method="post" enctype="multipart/form-data">

    <div class="box">

        <div class="title">人脸特征识别系统 --krry</div>

        <input type="file" id="fileChoice" accept="image/jpeg,image/png" style="display:none" name="files"/>

        <a class="b_btn" href="javascript:void(0);" onclick="choice()">选择照片</a>

        <input type="button" value="提交解析" class="b_btn" id="but"/>

        <input type="submit" class="sub_btn" style="display:none;"/>

    </div>

    </form>

    <div class="busbu"></div>

      <script src="js/jquery-1.11.3.min.js"></script>

     <script src="js/sg.js"></script>

     <script src="js/sgutil.js"></script>

     <script type="text/javascript" src="css/sg/tz_util.js"></script>

     <script type="text/javascript" src="css/sg/sg.js"></script>

     <script type="text/javascript">

     <%=strBuff.toString() %>

     //选择照片

     function choice(){

        //js 弱类型  快速定位

        var choose = document.getElementById("fileChoice");

        choose.click();

     }

     $("#but").click(function(){

         if($("#fileChoice").val()){//如果选择了照片

             $(".sub_btn").click();

             $(".busbu").show();

             loading("正在解析",900);//再展示

         }else{

             $.tmDialog.alert({open:"top",content:"请先选择一张照片",title:"Krry温馨提醒"});

         }

     });

 </script>

 </body>

 </html>

需要注意的点，json 字符串的转换和解析，获取 json 中人脸属性的方法

git：https://github.com/Krryxa/face

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