java微信小程序登录

登录接口
官网地址：https://developers.weixin.qq.com/miniprogram/dev/api/code2Session.html
参考地址：https://blog.csdn.net/abcwanglinyong/article/details/80267901

@ApiOperation(notes = "/login", httpMethod = "POST", value = "登录")
    @ResponseBody
    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public LoginRegisterResult doLogin(@RequestBody LoginParams params){
        LOGGER.info( "小程序登录==" );
        LoginRegisterResult registerResult = new LoginRegisterResult();

        if (StringUtils.isNotBlank(params.getCode())) {
			
			//调取微信中 用户openID
            JSONObject sessionKeyOpenId = getSessionKeyOrOpenId(params.getCode());

            String openid = sessionKeyOpenId.getString("openid" );

            String sessionKey = sessionKeyOpenId.getString( "session_key" );
//            String unionid = sessionKeyOpenId.getString( "unionid" );

            LOGGER.info("openid {},session_key{}",openid,sessionKey);

            JSONObject userInfo = getUserInfo( params.getEncrypteData(), sessionKey, params.getIv() );
            LOGGER.info("根据解密算法获取的userInfo="+userInfo);

            ApplentUserInfoDto dto = FastJsonUtil.parseToObject(userInfo.toJSONString(), ApplentUserInfoDto.class);
			
			//用户信息保存到库中
            Channel channel = getChannelByCode(getChannelCodeByTouristUUid());
            ReaderUserLoginAccount readerUserLoginAccount = addReader(dto, channel);

            //将用户信息放到redis
            //根据unionid生成token
            String encrypt = SimpleAesUtil.encrypt(readerUserLoginAccount.getAccount_num());
            readerCloudManager.setReaderUser(encrypt, readerUserLoginAccount.getReader_id());
            LOGGER.info("微信登录成功，token：{},user Id:{}", encrypt, readerUserLoginAccount.getReader_id());

		//返给前端信息
            registerResult.setCode(OperationStatus.SUCCESS.getType());
            registerResult.setMsg(OperationStatus.SUCCESS.getName());
            registerResult.setToken(encrypt);
            registerResult.setApplent_open_id(openid);
            return registerResult;
        }

        registerResult.setCode(OperationStatus.FAIL.getType());
        registerResult.setMsg(OperationStatus.FAIL.getName());
        return registerResult;
    }

 public JSONObject getSessionKeyOrOpenId(String code){
        //微信端登录code
        StringBuffer params = new StringBuffer();
        params.append(conf.get(ApiConstant.WEIXIN_APPLENT_LOGIN_OPENID_URL));
        params.append("?appid=").append(conf.get(ApiConstant.WEIXIN_APPLENT_APPID));
        params.append("&secret=").append(conf.get(ApiConstant.WEIXIN_APPLENT_SECRET));
        params.append("&js_code=").append(code);
        params.append("&grant_type=authorization_code");
        String result = HttpClientUtil.sendGet(params.toString());
        LOGGER.info("小程序 获取OpenID 请求:{}，结果:{}", params.toString(), result);
        return JSON.parseObject(result);
    }

//解密获取用户信息
public static JSONObject getUserInfo(String encryptedData,String sessionKey,String iv){
        // 被加密的数据
        byte[] dataByte =  Base64.decodeBase64(encryptedData);
        byte[] keyByte =  Base64.decodeBase64(sessionKey);
        byte[] ivByte =  Base64.decodeBase64(iv);


        try {
            // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
            int base = 16;
            if (keyByte.length % base != 0) {
                int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
                byte[] temp = new byte[groups * base];
                Arrays.fill(temp, (byte) 0);
                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
                keyByte = temp;
            }
            // 初始化
            Security.addProvider(new BouncyCastleProvider());
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));
            cipher.init( Cipher.DECRYPT_MODE, spec, parameters);// 初始化
            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, "UTF-8");
                return JSON.parseObject(result);
            }
        } catch (NoSuchAlgorithmException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (NoSuchPaddingException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (InvalidParameterSpecException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (IllegalBlockSizeException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (BadPaddingException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (UnsupportedEncodingException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (InvalidKeyException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (InvalidAlgorithmParameterException e) {
            LOGGER.error(e.getMessage(), e);
        } catch (NoSuchProviderException e) {
            LOGGER.error(e.getMessage(), e);
        }
        return null;
    }

//解密获取的实体类
/**
 * 小程序登录 返回用户信息
 */
public class ApplentUserInfoDto{

    /**
     * 用户的唯一标识
     */
    private String openId;
    /**
     * 用户昵称
     */
    private String nickName;
    /**
     * 用户的性别，性别 0：未知、1：男、2：女
     */
    private int gender;
    /**
     * 用户所在省份
     */
    private String province;
    /**
     * 用户所在城市
     */
    private String city;
    /**
     * 用户所在国家
     */
    private String country;
    /**
     * 用户唯一id
     */
    private String unionId;
    /**
     * 用户头像图片的 URL
     */
    private String avatarUrl;

    public String getOpenId() {
        return openId;
    }

    public void setOpenId(String openId) {
        this.openId = openId;
    }

    public String getNickName() {
        return nickName;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName;
    }

    public int getGender() {
        return gender;
    }

    public void setGender(int gender) {
        this.gender = gender;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getUnionId() {
        return unionId;
    }

    public void setUnionId(String unionId) {
        this.unionId = unionId;
    }

    public String getAvatarUrl() {
        return avatarUrl;
    }

    public void setAvatarUrl(String avatarUrl) {
        this.avatarUrl = avatarUrl;
    }

}