import org.springframework.security.oauth2.provider.authentication.TokenExtractor; //导入依赖的package包/类
public static Optional<String> getAccessTokenValue(TokenExtractor tokenExtractor,  HttpServletRequest request){
	String accessToken = (String)request.getAttribute(OAuth2AuthenticationDetails.ACCESS_TOKEN_VALUE);
	if(accessToken==null){
		Authentication authentication = tokenExtractor.extract(request);
		accessToken = authentication==null?null:(String)authentication.getPrincipal();
	}
	return Optional.ofNullable(accessToken);
}
 

import org.springframework.security.oauth2.provider.authentication.TokenExtractor; //导入依赖的package包/类
private TokenExtractor tokenExtractor() {
  return new BearerTokenExtractor() {
    protected String extractToken(HttpServletRequest request) {
      // only check the header...
      return extractHeaderToken(request);
    }
  };
}
 

import org.springframework.security.oauth2.provider.authentication.TokenExtractor; //导入依赖的package包/类
public PoPTokenExtractor(TokenExtractor delegate) {
    this.delegate = delegate;
}
 

import org.springframework.security.oauth2.provider.authentication.TokenExtractor; //导入依赖的package包/类
/**
 * The new TokenExtractor can extract tokens from Cookies and Authorization headers.
 *
 * @return the CookieTokenExtractor bean.
 */
@Bean
public TokenExtractor tokenExtractor() {
    return new CookieTokenExtractor();
}