Grails Facebook Login using spring security - how to know logged in user name

Question

在Grails应用程序中，使用spring security facebook插件，当用户登录时，应用程序如何获得实际的facebook用户名，以便主页可以显示登录的用户名？

Answer 1

The plugin provides Facebook API access_token , and you have to request such user details from Facebook.

Example:

Add dependency to Spring Social Facebook:

dependency {
  compile 'org.springframework.social:spring-social-core:1.0.1.RELEASE'
  compile 'org.springframework.social:spring-social-facebook:1.0.1.RELEASE'
}

and then load it from Facebook on user creation, by adding following into FacebookAuthService:

void onCreate(FacebookUser user, FacebookAuthToken token) {
  Facebook facebook = new FacebookTemplate(token.accessToken.accessToken)
  FacebookProfile fbProfile = facebook.userOperations().userProfile

  //fill the name
  //fieldname ('fullname' at this example) is up to you
  user.fullname = fbProfile.name
}

See also

• docs for Spring Social - http://static.springsource.org/spring-social-facebook/docs/1.0.x/reference/html/apis.html#facebook-getProfile
• about FacebookUserService - http://splix.github.com/grails-spring-security-facebook/guide/5%20Customization.html#5.1%20Using%20FacebookAuthService