springboot整合微信(公众号)实现扫码登录(两种方式，两种实现)

<dependency>
  <groupId>com.github.binarywang</groupId>
  <artifactId>weixin-java-open</artifactId>
  <version>3.8.0</version>
</dependency>

import me.chanjar.weixin.mp.api.WxMpService;
import me.chanjar.weixin.mp.api.impl.WxMpServiceImpl;
import me.chanjar.weixin.mp.config.impl.WxMpDefaultConfigImpl;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author xiaobo
 * @date 2023/4/10
 */
@Configuration
public class WeChatCodeConfig {

    @Value("${wx.appid}")
    private String appId;

    @Value("${wx.appsecret}")
    private String appSecret;

    /**
     * 定义WxMpService bean
     */
    @Bean
    public WxMpService wxMpService() {
        WxMpService wxMpService = new WxMpServiceImpl();
        WxMpDefaultConfigImpl config = new WxMpDefaultConfigImpl();
        config.setAppId(appId);
        config.setSecret(appSecret);
        wxMpService.setWxMpConfigStorage(config);
        return wxMpService;
    }
}

		@PostMapping("/getLoginQrCode")
    @ResponseBody
    public RespResult getLoginQrCode() throws WxErrorException, UnsupportedEncodingException {
        // 设置场景id，登录的时候需要根据这个获取redis中存在的openid
        String sceneStr = IdUtil.getSnowflake().nextIdStr();
        WxMpQrCodeTicket wxMpQrCodeTicket = wxService.getQrcodeService().qrCodeCreateTmpTicket(sceneStr, 3600);
        // 这里获取到的是二维码，前端只需要用<img>标签中的src接收就可以展示
        String s = wxService.getQrcodeService().qrCodePictureUrl(wxMpQrCodeTicket.getTicket());
        return RespResult.success(s, sceneStr);
    }

	 	@PostMapping("wechatOpenIdLogin")
    @ResponseBody
    public RespResult wechatOpenIdLogin(String sceneStr, HttpServletRequest request) {
      // 这里的sceneStr是上面接口返回的，这步操作是微信事件推送之后会存一个redis 
      Boolean exists = JedisUtil.exists(sceneStr);
        if (exists) {
          	// TODO 业务操作，其中JedisUtil.getStr(sceneStr)能得到微信扫码用户的openid
            return weChatCodeService.wechatLogin(JedisUtil.getStr(sceneStr), request);
        } else {
            return RespResult.fail(sceneStr);
        }
    }

@RequestMapping("/sign")
public void sign(HttpServletResponse response, HttpServletRequest request) throws Exception {
  String method = request.getMethod();
  // 微信加密签名
  String signature = request.getParameter("signature");
  // 随机字符串
  String echostr = request.getParameter("echostr");
  // 时间戳
  String timestamp = request.getParameter("timestamp");
  // 随机数
  String nonce = request.getParameter("nonce");
  // 签名验证是get请求
  if ("GET".equals(method)) {
    String[] str = {"123456token", timestamp, nonce};
    // 字典排序
    Arrays.sort(str);
    String bigStr = str[0] + str[1] + str[2];
    // SHA1加密
    String digest = sha1(bigStr);
    // 确认请求来至微信
    if (digest.equals(signature)) {
      response.getWriter().print(echostr);
    }
  } else {
    // 获取WxMpXmlMessage
    WxMpXmlMessage wxMpXmlMessage = WxMpXmlMessage.fromXml(request.getInputStream());
    // OpenId
    String fromUserName = wxMpXmlMessage.getFromUser();
    // 消息类型，event
    final String msgType = wxMpXmlMessage.getMsgType();
    // 事件类型
    final String event = wxMpXmlMessage.getEvent();
    String sceneStr = "";
    log.error("微信返回验签是：{},{},{}", msgType, event, fromUserName);
    if (WxConsts.XmlMsgType.EVENT.equals(msgType)) {
                if (event.equals(WxConsts.EventType.SUBSCRIBE)) {
                    if (ticket != null) {
                        sceneStr = wxMpXmlMessage.getEventKey().replace("qrscene_", "");
                    }
                }
                //注：事件类型为SCAN即已关注
                else if (event.equals(WxConsts.EventType.SCAN)) {
                    if (ticket != null) {
                        sceneStr = wxMpXmlMessage.getEventKey();
                    }
                }
                // 如果sceneStr不为空代表用户已经扫描并且关注了公众号
                if (CharSequenceUtil.isNotEmpty(sceneStr)) {
                    // 将微信公众号用户ID缓存到redis中，标记用户已经扫码完成，执行登录逻辑。
                    JedisUtil.setStr(sceneStr, fromUserName, OpenIdRedisExpireTime);
                }
            }
    response.getWriter().write("可以随便写");
  }
}

/**
 * 获取微信扫码登录二维码
*/
@RequestMapping("/getLoginQrCode")
public RespResult getLoginQrCode() throws WxErrorException {
  // 重定向URl，这里必须配置公众号对应的域名
  String redirectUrl = "http://localhost:8080/login";
  // 这里只获取用户扫码地址
  String url = wxService.oauth2buildAuthorizationUrl(redirectUrl, WxConsts.OAuth2Scope.SNSAPI_BASE, null);
  return RespResult.success(url);
}

/**
 * 微信扫码登录
*/
@RequestMapping("wechatLogin")
public RespResult wechatLogin(@RequestParam("code") String code, HttpServletRequest request) {
  return weChatCodeService.wechatLogin(code, request);