Wechat applet obtains mobile number

1、 Main interface

 // Applet  AppID
    private static final String appid = "wxa******e0b3";
    // Applet  AppSecret
    private static final String secret = "8ffc**************bc0896e937d";

    @PostMapping("/wxphone")
    public Map<String,Object> wxphone(@RequestBody Image image)
    {
        Map<String,Object> map=new HashMap<>();

        String encryptedData=image.getParams().get("encryptedData").toString();
        String session_key="";
        String iv=image.getParams().get("iv").toString();
        String code=image.getParams().get("code").toString();

//       obtain session_key, Perfect it   Save to database 
        HttpUtil httpUtil=new HttpUtil();
        String params = "appid=" + appid + "&secret=" + secret + "&js_code=" + code + "&grant_type=authorization_code";
        String session_keyData=HttpUtil.sendGet("https://api.weixin.qq.com/sns/jscode2session", params);
        JSONObject json_session=JSONObject.parseObject(session_keyData);
        session_key=json_session.get("session_key").toString();

//       Get cell phone number 
        String result= WXBizDataCrypt.decrypt1(encryptedData,session_key,iv);
        JSONObject json=JSONObject.parseObject(result);

        if (!StringUtils.isEmpty(result)&&result.length()>0) {
            map.put("purePhoneNumber", json.getString("purePhoneNumber"));
            map.put("phoneNumber", json.getString("phoneNumber"));
            map.put("countryCode", json.getString("countryCode"));
            map.put("msg","success");
        }
        map.put("msg"," Press to operate successfully ");
        map.put("code",200);
        return map;
    }

2. Tool class   Request interface

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpUtil {

    /**
     *  Assign to URL send out GET Method request 
     *
     * @param url  Send requested URL
     * @param param  Request parameters , Request parameter should be  name1=value1&name2=value2  In the form of .
     * @return URL  Response result of the remote resource represented 
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            //  Open and URL Connection between 
            URLConnection connection = realUrl.openConnection();
            //  Set common request properties 
            connection.setRequestProperty("accept","*/*");
            connection.setRequestProperty("connection","Keep-Alive");
            connection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //  Establish the actual connection 
            connection.connect();
            //  Get all response header fields 
            Map<String, List<String>> map = connection.getHeaderFields();
            //  Traverse all response header fields 
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            //  Definition  BufferedReader Input stream to read URL Response 
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println(" send out GET Exception in request ！" + e);
            e.printStackTrace();
        }
        //  Use finally Block to close the input stream 
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

}

3. For decryption

import org.apache.commons.codec.binary.Base64;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;

public class WXBizDataCrypt {


        /**
         * AES Decrypt 
         *
         * @param data   // Ciphertext , Encrypted data 
         * @param key    // Secret key 
         * @param iv     // Offset 
         * @return
         * @throws Exception
         */
        public static String decrypt1(String data, String key,String iv){
            // Encrypted data 
            byte[] dataByte = Base64.decodeBase64(data);
            // Encryption key 
            byte[] keyByte = Base64.decodeBase64(key);
            // Offset 
            byte[] ivByte = Base64.decodeBase64(iv);
            try {
                AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivByte);
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                SecretKeySpec keySpec = new SecretKeySpec(keyByte, "AES");
                cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
                return new String(cipher.doFinal(dataByte),"UTF-8");
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
            } catch (InvalidKeyException e) {
                e.printStackTrace();
            } catch (InvalidAlgorithmParameterException e) {
                e.printStackTrace();
            } catch (IllegalBlockSizeException e) {
                e.printStackTrace();
            } catch (BadPaddingException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            return null;
        }

}