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微信和QQ登录的大体流程相同，但存在一些细节上的差异

准备工作

1. 熟悉OAuth2.0协议标准，微信登录是基于OAuth2.0中的authorization_code模式的授权登录；
2. 微信开放平台申请网站应用开发，获取appid和appsecret
3. 熟读网站应用微信登录开发指南

为了方便大家测试，博主在某宝租用了一个月的appid和appSecret

目录结构

参考

1. api 定义api绑定的公共接口
2. config 微信的一些配置信息
3. connect与服务提供商建立连接所需的一些类。

定义返回用户信息接口

public interface Weixin {WeixinUserInfo getUserInfo(String openId);
}

这里我们看到相对于QQ的getUserInfo微信多了一个参数openId。这是因为微信文档中在OAuth2.0的认证流程示意图第五步时，微信的openid 同access_token一起返回。而Spring Social获取access_token的类AccessGrant.java中没有openid。因此我们自己需要扩展一下Spring Social获取令牌的类（AccessGrant.java）；

处理微信返回的access_token类(添加openid)

@Data
public class WeixinAccessGrant extends AccessGrant{private String openId;public WeixinAccessGrant() {super("");}public WeixinAccessGrant(String accessToken, String scope, String refreshToken, Long expiresIn) {super(accessToken, scope, refreshToken, expiresIn);}
}

实现返回用户信息接口

public class WeiXinImpl extends AbstractOAuth2ApiBinding implements Weixin {/*** 获取用户信息的url*/private static final String WEIXIN_URL_GET_USER_INFO = "https://api.weixin.qq.com/sns/userinfo?openid=";private ObjectMapper objectMapper = new ObjectMapper();public WeiXinImpl(String accessToken) {super(accessToken, TokenStrategy.ACCESS_TOKEN_PARAMETER);}/*** 获取用户信息** @param openId* @return*/@Overridepublic WeixinUserInfo getUserInfo(String openId) {String url = WEIXIN_URL_GET_USER_INFO + openId;String result = getRestTemplate().getForObject(url, String.class);if(StringUtils.contains(result, "errcode")) {return null;}WeixinUserInfo userInfo = null;try{userInfo = objectMapper.readValue(result,WeixinUserInfo.class);}catch (Exception e){e.printStackTrace();}return userInfo;}/*** 使用utf-8 替换默认的ISO-8859-1编码* @return*/@Overrideprotected List<HttpMessageConverter<?>> getMessageConverters() {List<HttpMessageConverter<?>> messageConverters = super.getMessageConverters();messageConverters.remove(0);messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));return messageConverters;}
}

与QQ获取用户信息相比,微信的实现类中少了一步通过access_token获取openid的请求。openid由自己定义的扩展类WeixinAccessGrant中获取；

WeixinOAuth2Template处理微信返回的令牌信息

@Slf4j
public class WeixinOAuth2Template extends OAuth2Template {private String clientId;private String clientSecret;private String accessTokenUrl;private static final String REFRESH_TOKEN_URL = "https://api.weixin.qq.com/sns/oauth2/refresh_token";public WeixinOAuth2Template(String clientId, String clientSecret, String authorizeUrl, String accessTokenUrl) {super(clientId, clientSecret, authorizeUrl, accessTokenUrl);setUseParametersForClientAuthentication(true);this.clientId = clientId;this.clientSecret = clientSecret;this.accessTokenUrl = accessTokenUrl;}/* (non-Javadoc)* @see org.springframework.social.oauth2.OAuth2Template#exchangeForAccess(java.lang.String, java.lang.String, org.springframework.util.MultiValueMap)*/@Overridepublic AccessGrant exchangeForAccess(String authorizationCode, String redirectUri,MultiValueMap<String, String> parameters) {StringBuilder accessTokenRequestUrl = new StringBuilder(accessTokenUrl);accessTokenRequestUrl.append("?appid="+clientId);accessTokenRequestUrl.append("&secret="+clientSecret);accessTokenRequestUrl.append("&code="+authorizationCode);accessTokenRequestUrl.append("&grant_type=authorization_code");accessTokenRequestUrl.append("&redirect_uri="+redirectUri);return getAccessToken(accessTokenRequestUrl);}public AccessGrant refreshAccess(String refreshToken, MultiValueMap<String, String> additionalParameters) {StringBuilder refreshTokenUrl = new StringBuilder(REFRESH_TOKEN_URL);refreshTokenUrl.append("?appid="+clientId);refreshTokenUrl.append("&grant_type=refresh_token");refreshTokenUrl.append("&refresh_token="+refreshToken);return getAccessToken(refreshTokenUrl);}@SuppressWarnings("unchecked")private AccessGrant getAccessToken(StringBuilder accessTokenRequestUrl) {log.info("获取access_token, 请求URL: "+accessTokenRequestUrl.toString());String response = getRestTemplate().getForObject(accessTokenRequestUrl.toString(), String.class);log.info("获取access_token, 响应内容: "+response);Map<String, Object> result = null;try {result = new ObjectMapper().readValue(response, Map.class);} catch (Exception e) {e.printStackTrace();}//返回错误码时直接返回空if(StringUtils.isNotBlank(MapUtils.getString(result, "errcode"))){String errcode = MapUtils.getString(result, "errcode");String errmsg = MapUtils.getString(result, "errmsg");throw new RuntimeException("获取access token失败, errcode:"+errcode+", errmsg:"+errmsg);}WeixinAccessGrant accessToken = new WeixinAccessGrant(MapUtils.getString(result, "access_token"),MapUtils.getString(result, "scope"),MapUtils.getString(result, "refresh_token"),MapUtils.getLong(result, "expires_in"));accessToken.setOpenId(MapUtils.getString(result, "openid"));return accessToken;}/*** 构建获取授权码的请求。也就是引导用户跳转到微信的地址。*/public String buildAuthenticateUrl(OAuth2Parameters parameters) {String url = super.buildAuthenticateUrl(parameters);url = url + "&appid="+clientId+"&scope=snsapi_login";return url;}public String buildAuthorizeUrl(OAuth2Parameters parameters) {return buildAuthenticateUrl(parameters);}/*** 微信返回的contentType是html/text，添加相应的HttpMessageConverter来处理。*/protected RestTemplate createRestTemplate() {RestTemplate restTemplate = super.createRestTemplate();restTemplate.getMessageConverters().add(new StringHttpMessageConverter(Charset.forName("UTF-8")));return restTemplate;}
}

与QQ处理令牌类相比多了三个全局变量并且复写了exchangeForAccess方法。这是因为微信在通过code获取access_token是传递的参数是appid和secret而不是标准的client_id和client_secret。

WeixinServiceProvider连接服务提供商

public class WeixinServiceProvider extends AbstractOAuth2ServiceProvider<Weixin> {/*** 微信获取授权码的url*/private static final String WEIXIN_URL_AUTHORIZE = "https://open.weixin.qq.com/connect/qrconnect";/*** 微信获取accessToken的url(微信在获取accessToken时也已经返回openId)*/private static final String WEIXIN_URL_ACCESS_TOKEN = "https://api.weixin.qq.com/sns/oauth2/access_token";public WeixinServiceProvider(String appId, String appSecret) {super(new WeixinOAuth2Template(appId, appSecret, WEIXIN_URL_AUTHORIZE, WEIXIN_URL_ACCESS_TOKEN));}@Overridepublic Weixin getApi(String accessToken) {return new WeiXinImpl(accessToken);}
}

WeixinConnectionFactory连接服务提供商的工厂类

public class WeixinConnectionFactory extends OAuth2ConnectionFactory<Weixin> {/*** @param appId* @param appSecret*/public WeixinConnectionFactory(String providerId, String appId, String appSecret) {super(providerId, new WeixinServiceProvider(appId, appSecret), new WeixinAdapter());}/*** 由于微信的openId是和accessToken一起返回的，所以在这里直接根据accessToken设置providerUserId即可，不用像QQ那样通过QQAdapter来获取*/@Overrideprotected String extractProviderUserId(AccessGrant accessGrant) {if(accessGrant instanceof WeixinAccessGrant) {return ((WeixinAccessGrant)accessGrant).getOpenId();}return null;}/* (non-Javadoc)* @see org.springframework.social.connect.support.OAuth2ConnectionFactory#createConnection(org.springframework.social.oauth2.AccessGrant)*/public Connection<Weixin> createConnection(AccessGrant accessGrant) {return new OAuth2Connection<Weixin>(getProviderId(), extractProviderUserId(accessGrant), accessGrant.getAccessToken(),accessGrant.getRefreshToken(), accessGrant.getExpireTime(), getOAuth2ServiceProvider(), getApiAdapter(extractProviderUserId(accessGrant)));}/* (non-Javadoc)* @see org.springframework.social.connect.support.OAuth2ConnectionFactory#createConnection(org.springframework.social.connect.ConnectionData)*/public Connection<Weixin> createConnection(ConnectionData data) {return new OAuth2Connection<Weixin>(data, getOAuth2ServiceProvider(), getApiAdapter(data.getProviderUserId()));}private ApiAdapter<Weixin> getApiAdapter(String providerUserId) {return new WeixinAdapter(providerUserId);}private OAuth2ServiceProvider<Weixin> getOAuth2ServiceProvider() {return (OAuth2ServiceProvider<Weixin>) getServiceProvider();}}

WeixinAdapter将微信api返回的数据模型适配Spring Social的标准模型

public class WeixinAdapter implements ApiAdapter<Weixin> {private String openId;public WeixinAdapter() {}public WeixinAdapter(String openId) {this.openId = openId;}@Overridepublic boolean test(Weixin api) {return true;}@Overridepublic void setConnectionValues(Weixin api, ConnectionValues values) {WeixinUserInfo userInfo = api.getUserInfo(openId);values.setProviderUserId(userInfo.getOpenid());values.setDisplayName(userInfo.getNickname());values.setImageUrl(userInfo.getHeadimgurl());}@Overridepublic UserProfile fetchUserProfile(Weixin api) {return null;}@Overridepublic void updateStatus(Weixin api, String message) {}
}

WeixinAuthConfig创建工厂和设置数据源

@Configuration
public class WeixinAuthConfig extends SocialAutoConfigurerAdapter {@Autowiredprivate DataSource dataSource;@Autowiredprivate ConnectionSignUp myConnectionSignUp;@Overrideprotected ConnectionFactory<?> createConnectionFactory() {return new WeixinConnectionFactory(DEFAULT_SOCIAL_WEIXIN_PROVIDER_ID, SecurityConstants.DEFAULT_SOCIAL_WEIXIN_APP_ID,SecurityConstants.DEFAULT_SOCIAL_WEIXIN_APP_SECRET);}@Overridepublic UsersConnectionRepository getUsersConnectionRepository(ConnectionFactoryLocator connectionFactoryLocator) {JdbcUsersConnectionRepository repository = new JdbcUsersConnectionRepository(dataSource,connectionFactoryLocator, Encryptors.noOpText());if (myConnectionSignUp != null) {repository.setConnectionSignUp(myConnectionSignUp);}return repository;}/*** /connect/weixin POST请求,绑定微信返回connect/weixinConnected视图* /connect/weixin DELETE请求,解绑返回connect/weixinConnect视图* @return*/@Bean({"connect/weixinConnect", "connect/weixinConnected"})@ConditionalOnMissingBean(name = "weixinConnectedView")public View weixinConnectedView() {return new SocialConnectView();}}

社交登录配置类

配置SocialAuthenticationFilter过滤器拦截。