1.访问主页地址/client/index
2. ExceptionTranslationFilter拦截,跳转client/login
3. OAuth2ClientAuthenticationProcessingFilter---------->OAuth2RestTemplate
4. OAuth2RestTemplate 抛出异常,
5.OAuth2ClientContextFilter 访问传递resource : clientId+clientSecret 访问 http://127.0.0.1:9999/server/oauth/authorize
6.认证成功后 跳转 client/login , OAuth2ClientAuthenticationProcessingFilter---------->OAuth2RestTemplate获取token
7.登录陈功