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直接上干货，下面中间有一些 我自己的业务逻辑，比如businesscode，你们可以去掉，我要支持多个生活号做的。

   			
    
     com.alipay.sdk
    			
    
     alipay-sdk-java
    			
    
     3.4.27.ALL
    		
   

/**     * 支付宝sdkclient     */    private Map
   
     alipayClientMap = new HashMap<>();    /**     * code与支付宝appid的map     */    private Map
    
      alipayAppIdCodeMap = new HashMap<>();    /**     * 支付宝服务窗配置     */    @Autowired    private UcenterAlipaySettService alipaySettService;    /**     * 支付宝oauth2 登录url     */    private static  final  String ALIPAY_OAUTH2_URL = "https://openauth.alipay.com/oauth2/publicAppAuthorize.htm?";    /**     * 支付宝oauth 登录     * @param request request     * @param response response     * @param code 扩展编码     * @throws WxErrorException     * @throws IOException     */    public void alipayHandleLogin(HttpServletRequest request,HttpServletResponse response,String code)    {        //如果不包含此code参数则获取参数        if(!alipayClientMap.containsKey(code))        {            UcenterAlipaySett alipaySett =alipaySettService.selectBean(UcenterAlipaySett.builder().extendsCode(code).build());            AlipayClient alipayClient =                    new DefaultAlipayClient("https://openapi.alipay.com/gateway.do",                            alipaySett.getAppId(),alipaySett.getAppPrivateKey(),                            "json", "UTF-8", alipaySett.getAlipayKey(), "RSA2");            alipayClientMap.put(code,alipayClient);            alipayAppIdCodeMap.put(code,alipaySett.getAppId());        }        String url = null;        try {            url = ALIPAY_OAUTH2_URL + "app_id=" + alipayAppIdCodeMap.get(code)                    + "&scope=auth_user&redirect_uri=" + URLEncoder.encode(EConfig.getPathPropertiesValue("basePath")                    + "/webApi/front/alipayCodeLogin","UTF-8");            response.sendRedirect(url);        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 处理支付宝登录     * @param auth_code 授权码(原谅我没有用驼峰)     * @param request     * @param response     */    @RequestMapping("/alipayCodeLogin")    public void alipayOpenIdLogin(String auth_code,HttpServletRequest request,HttpServletResponse response) throws IOException {        AlipaySystemOauthTokenRequest getUserIdRequest = new AlipaySystemOauthTokenRequest();        getUserIdRequest.setCode(auth_code);        getUserIdRequest.setGrantType("authorization_code");        String businessCode = (String)request.getSession().getAttribute("code");        try {            AlipaySystemOauthTokenResponse alipayResponse =  alipayClientMap.get(businessCode).execute(getUserIdRequest);            String alipayUserId = alipayResponse.getAlipayUserId();            handleAlipayUserIdLogin(alipayUserId,alipayResponse.getAccessToken() ,businessCode,request,response);        } catch (AlipayApiException e) {            LOGGER.error("支付宝方法调用错误",e);            throw new BusinessException(e.getErrMsg());        }    }    /**     * 处理根据支付宝userid登录     * @param alipayUserId     * @param request     * @param response     */    private void handleAlipayUserIdLogin(String alipayUserId,String alipayAccessToken,String businessCode,                                         HttpServletRequest request,HttpServletResponse response) throws IOException {        HttpSession session = request.getSession();        UcenterFrontUserBind bind = userBindService.selectBean(UcenterFrontUserBind.builder().authOpenid(alipayUserId).authOpenidType(UcenterFrontUserBindService.OPENID_TYPE_ALIPAY)                .build());        String userId = null;        if(bind == null)        {            try {                AlipayUserInfoShareRequest alipayUserInfoShareRequest = new AlipayUserInfoShareRequest();                AlipayUserInfoShareResponse userinfoShareResponse = alipayClientMap.get(businessCode).execute(alipayUserInfoShareRequest, alipayAccessToken);                // 默认是未知                String sex =UcenterFrontUserService.SEX_UNKNOWN;                if("M".equals(userinfoShareResponse.getGender()))                {                    sex = UcenterFrontUserService.SEX_BOY;                }else  if("F".equals(userinfoShareResponse.getGender()))                {                    sex = UcenterFrontUserService.SEX_GIRL;                }                UcenterFrontUser user = UcenterFrontUser.builder().userId(StringUtil.getUUID())                        .nickName(userinfoShareResponse.getNickName()).provinceId(userinfoShareResponse.getProvince()).                                cityId(userinfoShareResponse.getCity())                        .sex(sex).imagePath(userinfoShareResponse.getAvatar()).build();                userId = loginService.addBindAndUser(user,alipayUserId,UcenterFrontUserBindService.OPENID_TYPE_ALIPAY);            }  catch (AlipayApiException e) {                LOGGER.error("根据openid获取用户信息错误:",e);                throw new BusinessException(e.getErrMsg());            }        }        else        {            userId = bind.getUserId();        }        String accessToken = loginService.login(userId);        String callback = session.getAttribute("callBack").toString();        response.sendRedirect(checkUrl(callback, accessToken));    }
    
   

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