微信官方提供的信息还要手写内部转发，太麻烦了。本着省事的原则，找到了开源wxjava来进行一些小程序获取授权和手机号的操作

• 引入jar

<dependency>
    <groupId>com.github.binarywang</groupId>
    <artifactId>weixin-java-miniapp</artifactId>
    <version>3.6.0</version>
</dependency>

• 配置SpringBean,WechatConfig

/**
 * 微信小程序配置类
 */
@SpringBootConfiguration
public class WechatConfig {
    @Value("${wechat.appid}")
    private String appId;
    @Value("${wechat.secret}")
    private String secret;

    @Bean
    public WxMaConfig wxMaConfig() {
        WxMaDefaultConfigImpl config = new WxMaDefaultConfigImpl();
        config.setAppid(appId);
        config.setSecret(secret);
        config.setMsgDataFormat("JSON");
        return config;
    }

    @Bean
    public WxMaService wxMaService(WxMaConfig maConfig) {
        WxMaService service = new WxMaServiceImpl();
        service.setWxMaConfig(maConfig);
        return service;
    }
}

• 实体WechatLogin,如果不使用可以忽略

@Data
public class WechatLogin {

    @ApiModelProperty("用户登录凭证")
    private String code;

    @ApiModelProperty("原始数据字符串")
    private String signature;

    @ApiModelProperty("校验用户信息字符串")
    private String rawData;

    @ApiModelProperty("手机号加密用户数据")
    private String phoneEncryptedData;

    @ApiModelProperty("手机号加密算法的初始向量")
    private String phoneIv;

    @ApiModelProperty("基本信息加密用户数据")
    private String basicEncryptedData;

    @ApiModelProperty("基本信息加密算法的初始向量")
    private String basicIv;

    @ApiModelProperty("图片地址")
    private String avatarUrl;


}

• 一些基本操作

   /**
    * 获取用户登录Session
    */
    public WxMaJscode2SessionResult getWechatSession(WechatLogin wechatLogin) {
        WxMaJscode2SessionResult session = null;
        try {
            // 获取微信用户session
            session = wxMaService.getUserService().getSessionInfo(wechatLogin.getCode());
            if (null == session) {
                throw new RuntimeException("登录异常");
            }
        } catch (WxErrorException e) {
            throw new RuntimeException("获取微信用户Session异常");
        }

        return session;
    }


    /**
     * 解密微信用户信息
     */
    public WxMaUserInfo getWxMaUserInfo(WxMaJscode2SessionResult wxMaJscode2SessionResult, WechatLogin wechatLogin) {
        WxMaUserInfo wxUserInfo = wxMaService.getUserService().getUserInfo(wxMaJscode2SessionResult.getSessionKey(),
                wechatLogin.getBasicEncryptedData(), wechatLogin.getBasicIv());
        if (null == wxUserInfo) {
            throw new RuntimeException("获取用户信息异常");
        }

        return wxUserInfo;
    }

    /**
     * 解密手机号码信息
     */
    public WxMaPhoneNumberInfo getWxMaPhoneNumberInfo(WxMaJscode2SessionResult wxMaJscode2SessionResult, WechatLogin wechatLogin) {
        WxMaPhoneNumberInfo wxMaPhoneNumberInfo = wxMaService.getUserService().getPhoneNoInfo(wxMaJscode2SessionResult.getSessionKey(),wechatLogin.getPhoneEncryptedData(), wechatLogin.getPhoneIv());
        if (Objects.isNull(wxMaPhoneNumberInfo) || StringUtils.isBlank(wxMaPhoneNumberInfo.getPhoneNumber())) {
            throw new RuntimeException("解密手机号码信息错误");
        }

        return wxMaPhoneNumberInfo;
    }