spring-security-oauth2 登录或者认证成功后 做一些操作， 比如登录日志。

通过跟踪代码，发现放当我们访问/oauth/token （这个请求的方法在TokenEndpoint）获取access_token 的时候，身份认证成功后会在 ProviderManager的authenticate 方法 通过eventPublisher.publishAuthenticationSuccess(result);
推出了一个认证成功的事件。

这样我们可以通过注册一个监听AuthenticationSuccessEvent事件的类， 对认证成功后 作出一些处理。
注意的是这个事件源可能有2种情况:
1.通过用户名密码校验身份的事件源（UsernamePasswordAuthenticationToken）
2.根据access_token校验 是否有效token的的事件源（OAuth2Authentication）

@Component
public class AuthenticationSuccessEventListener implements ApplicationListener<AuthenticationSuccessEvent> {

    @Autowired
    private LogService logService;

    @Override
    public void onApplicationEvent(AuthenticationSuccessEvent event) {
        //这里的事件源除了登录事件（UsernamePasswordAuthenticationToken）还有可能是token验证事件源（OAuth2Authentication）
        if(!event.getSource().getClass().getName().equals("org.springframework.security.authentication.UsernamePasswordAuthenticationToken")){
            return ;
        }
 		//登录日志逻辑。。。
 		
    }
}

部分源码–访问/oauth/token的入口

@FrameworkEndpoint
public class TokenEndpoint extends AbstractEndpoint {

	private OAuth2RequestValidator oAuth2RequestValidator = new DefaultOAuth2RequestValidator();

	private Set<HttpMethod> allowedRequestMethods = new HashSet<HttpMethod>(Arrays.asList(HttpMethod.POST));

	@RequestMapping(value = "/oauth/token", method=RequestMethod.GET)
	public ResponseEntity<OAuth2AccessToken> getAccessToken(Principal principal, @RequestParam
	Map<String, String> parameters) throws HttpRequestMethodNotSupportedException {
		
	}
	
	@RequestMapping(value = "/oauth/token", method=RequestMethod.POST)
	public ResponseEntity<OAuth2AccessToken> postAccessToken(Principal principal, @RequestParam
	Map<String, String> parameters) throws HttpRequestMethodNotSupportedException {


	}

部分源码–推出 认证成功事件 -eventPublisher.publishAuthenticationSuccess(result);

public class ProviderManager implements AuthenticationManager, MessageSourceAware,
		InitializingBean {

public Authentication authenticate(Authentication authentication)
			throws AuthenticationException {
		Class<? extends Authentication> toTest = authentication.getClass();
		AuthenticationException lastException = null;
		Authentication result = null;
		boolean debug = logger.isDebugEnabled();

		for (AuthenticationProvider provider : getProviders()) {
			if (!provider.supports(toTest)) {
				continue;
			}

			if (debug) {
				logger.debug("Authentication attempt using "
						+ provider.getClass().getName());
			}

			try {
				result = provider.authenticate(authentication);

				if (result != null) {
					copyDetails(authentication, result);
					break;
				}
			}
			catch (AccountStatusException e) {
				prepareException(e, authentication);
				// SEC-546: Avoid polling additional providers if auth failure is due to
				// invalid account status
				throw e;
			}
			catch (InternalAuthenticationServiceException e) {
				prepareException(e, authentication);
				throw e;
			}
			catch (AuthenticationException e) {
				lastException = e;
			}
		}

		if (result == null && parent != null) {
			// Allow the parent to try.
			try {
				result = parent.authenticate(authentication);
			}
			catch (ProviderNotFoundException e) {
				// ignore as we will throw below if no other exception occurred prior to
				// calling parent and the parent
				// may throw ProviderNotFound even though a provider in the child already
				// handled the request
			}
			catch (AuthenticationException e) {
				lastException = e;
			}
		}

		if (result != null) {
			if (eraseCredentialsAfterAuthentication
					&& (result instanceof CredentialsContainer)) {
				// Authentication is complete. Remove credentials and other secret data
				// from authentication
				((CredentialsContainer) result).eraseCredentials();
			}

			eventPublisher.publishAuthenticationSuccess(result);
			return result;
		}

		// Parent was null, or didn't authenticate (or throw an exception).

		if (lastException == null) {
			lastException = new ProviderNotFoundException(messages.getMessage(
					"ProviderManager.providerNotFound",
					new Object[] { toTest.getName() },
					"No AuthenticationProvider found for {0}"));
		}

		prepareException(lastException, authentication);

		throw lastException;
	}
}