小程序登录之支付宝授权的实现示例

var me = this;
  my.getAuthCode({
   scopes: 'auth_user', // 主动授权（弹框）：auth_user，静默授权（不弹框）：auth_base
   success: (res) => {
    if (res.authCode) {
     // console.log(app.serverUrl + '/login/' + res.authCode);
     // 调用自己的服务端接口，让服务端进行后端的授权认证
     my.httpRequest({
      url: app.serverUrl + '/login/' + res.authCode,
      method: 'POST',
      header:{
       'content-type': 'application/json'
      },
      dataType: 'json',
      success: (res) => {
       // 授权成功并且服务器端登录成功
       console.log(res);
       me.setData({
        userInfo: res.data.data
       });
      }
     });
    }
   },
  });

@Autowired
  private UserService userService;

  @ApiOperation(value = "统一登录接口", notes = "支付宝小程序唤起登录后调用", httpMethod = "POST")
  @PostMapping("/login/{authCode}")
  public IMoocJSONResult items(
      @ApiParam(name = "authCode", 
      value = "授权码", 
      required = true, 
      example = "授权码") @PathVariable String authCode) throws Exception {

    // 1. 服务端获取access_token、user_id
    AlipaySystemOauthTokenResponse response = getAccessToken(authCode);
    if (response.isSuccess()) {
      System.out.println("获取access_token - 调用成功");
      /**
       * 获取到用户信息后保存到数据
       * 1. 如果数据库不存在对用的 alipayUserId, 则注册
       * 2. 如果存在，则获取数据库中的信息再返回
       */
      String accessToken = response.getAccessToken();
      String alipayUserId = response.getUserId();
      System.out.println("accessToken:" + accessToken);
      System.out.println("alipayUserId:" + alipayUserId);
      
      // 2. 查询该用户是否存在
      Users userInfo = userService.queryUserIsExist(alipayUserId);
      if (userInfo != null) {
        // 如果用户存在，直接返回给前端，表示登录成功
        return IMoocJSONResult.ok(userInfo);
      } else {
        // 如果用户不存在，则通过支付宝api获取用户的信息后，再注册用户到自己平台数据库
        // 获取会员信息
        AlipayUserInfoShareResponse aliUserInfo = getAliUserInfo(accessToken);
        if (aliUserInfo != null) {
           Users newUser = new Users();
           newUser.setAlipayUserId(alipayUserId);
           newUser.setNickname(aliUserInfo.getNickName());
           newUser.setRegistTime(new Date());
           newUser.setIsCertified(aliUserInfo.getIsCertified().equals("T") ? 1 : 0);
           newUser.setFaceImage(aliUserInfo.getAvatar());
           userService.createUser(newUser);
           return IMoocJSONResult.ok(newUser);
        }
      }
    } else {
      System.out.println("获取access_token - 调用失败");
    }
    return IMoocJSONResult.ok();
  }
  
  // 服务端获取access_token、user_id
  private AlipaySystemOauthTokenResponse getAccessToken(String authCode) throws Exception {
    AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do", 
        APPID,          // 1. 填入appid
        PRIVATE_KEY,      // 2. 填入私钥 
        "json", 
        "GBK", 
        ALIPAY_PUBLIC_KEY,     // 3. 填入公钥
        "RSA2");
    AlipaySystemOauthTokenRequest request = new AlipaySystemOauthTokenRequest();
    request.setGrantType("authorization_code");
    request.setCode(authCode);    // 4. 填入前端传入的授权码authCode
    request.setRefreshToken("201208134b203fe6c11548bcabd8da5bb087a83b");  // 0. 不用管
    AlipaySystemOauthTokenResponse response = alipayClient.execute(request);

    return response;
  }
    
  // 获取支付宝用户信息
  private AlipayUserInfoShareResponse getAliUserInfo (String accessToken) throws Exception {
    AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do",
        APPID,          // 1. 填入appid
        PRIVATE_KEY,      // 2. 填入私钥 
        "json", 
        "GBK", 
        ALIPAY_PUBLIC_KEY,     // 3. 填入公钥
        "RSA2");
    AlipayUserInfoShareRequest request = new AlipayUserInfoShareRequest();
    AlipayUserInfoShareResponse response = alipayClient.execute(request, accessToken);
    if(response.isSuccess()){
      System.out.println("获取会员信息 - 调用成功");
      return response;
    }

    return null;
  }