微信小程序用户授权获取手机号（getPhoneNumber）

<button class='pop_btn' plain="true"

open-type='getPhoneNumber' bindgetphonenumber="getPhoneNumber">获取用户手机号</button>

wxlogin: function() { //获取用户的openID和sessionKey
  var that = this;
  wx.login({
    //获取code 使用wx.login得到的登陆凭证，用于换取openid
    success: (res) = >{
      wx.request({
        method: "GET",
        url: 'https://xxxwx/wxlogin.do',
        data: {
          code: res.code,
          appId: "appIdSbcx",
          appKey: "appKeySbcx"

        },
        header: {
          'content-type': 'application/json' // 默认值
        },
        success: (res) = >{
          console.log(res);
          that.setData({
            sessionKey: res.data.session_key

          });
        }
      });
    }
  });
}

getPhoneNumber: function(e) { //点击获取手机号码按钮
  var that = this;
  wx.checkSession({
    success: function() {
      console.log(e.detail.errMsg)
      console.log(e.detail.iv)
      console.log(e.detail.encryptedData)
      var ency = e.detail.encryptedData;
      var iv = e.detail.iv;
      var sessionk = that.data.sessionKey;
      if (e.detail.errMsg == 'getPhoneNumber:fail user deny') {
        that.setData({
          modalstatus: true
        });

      } else { //同意授权
        wx.request({
          method: "GET",
url: 'https://xxx/wx/deciphering.do',
          data: {
            encrypdata: ency,
            ivdata: iv,
            sessionkey: sessionk
          },
          header: {
            'content-type': 'application/json' // 默认值
          },
          success: (res) = >{
            console.log("解密成功~~~~~~~将解密的号码保存到本地~~~~~~~~");
            console.log(res);
            var phone = res.data.phoneNumber;
            console.log(phone);
          },
          fail: function(res) {
            console.log("解密失败~~~~~~~~~~~~~");
            console.log(res);
          }
        });
      }

    },

    fail: function() {
      console.log("session_key 已经失效，需要重新执行登录流程");
      that.wxlogin(); //重新登录
    }
  });
}

/**
* 解密并且获取用户手机号码
* @param encrypdata
* @param ivdata
* @param sessionkey
* @param request
* @return
* @throws Exception 
*/
@RequestMapping(value = "deciphering", method = RequestMethod.GET)
public @ResponseBody String deciphering(String encrypdata, 
String ivdata, String sessionkey,
HttpServletRequest request) {

    byte[] encrypData = Base64.decode(encrypdata); 
    byte[] ivData = Base64.decode(ivdata); 
    byte[] sessionKey = Base64.decode(sessionkey); 
    String str="";
try {
str = decrypt(sessionKey,ivData,encrypData);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
    System.out.println(str); 
    return str;

}
public static String decrypt(byte[] key, byte[] iv, byte[] encData) throws Exception { 
    AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv); 
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); 
    SecretKeySpec keySpec = new SecretKeySpec(key, "AES"); 
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec); 
    //解析解密后的字符串 
    return new String(cipher.doFinal(encData),"UTF-8"); 
  }