import org.apache.shiro.web.subject.support.WebDelegatingSubject; //导入依赖的package包/类
public Subject createSubject(SubjectContext context) {
    if (!(context instanceof WebSubjectContext)) {
        return super.createSubject(context);
    }
    WebSubjectContext wsc = (WebSubjectContext) context;
    SecurityManager securityManager = wsc.resolveSecurityManager();
    Session session = wsc.resolveSession();
    boolean sessionEnabled = wsc.isSessionCreationEnabled();
    PrincipalCollection principals = wsc.resolvePrincipals();
    boolean authenticated = wsc.resolveAuthenticated();
    String host = wsc.resolveHost();
    ServletRequest request = wsc.resolveServletRequest();
    ServletResponse response = wsc.resolveServletResponse();

    return new WebDelegatingSubject(principals, authenticated, host, session, sessionEnabled,
            request, response, securityManager);
}
 

import org.apache.shiro.web.subject.support.WebDelegatingSubject; //导入依赖的package包/类
/**
 * @deprecated since 1.2 - override {@link #createSubject(org.apache.shiro.subject.SubjectContext)} directly if you
 *             need to instantiate a custom {@link Subject} class.
 */
@Deprecated
protected Subject newSubjectInstance(PrincipalCollection principals, boolean authenticated,
                                     String host, Session session,
                                     ServletRequest request, ServletResponse response,
                                     SecurityManager securityManager) {
    return new WebDelegatingSubject(principals, authenticated, host, session, true,
            request, response, securityManager);
}
 

import org.apache.shiro.web.subject.support.WebDelegatingSubject; //导入依赖的package包/类
private String getRole(Subject currentUser) {
    WebDelegatingSubject user = (WebDelegatingSubject) currentUser;
    WizardWebSecurityManager securityManager = (WizardWebSecurityManager) user
            .getSecurityManager();
    List<String> role = securityManager.getRoles(user.getPrincipals());
    return role.isEmpty() ? null : role.get(0);
}
 

import org.apache.shiro.web.subject.support.WebDelegatingSubject; //导入依赖的package包/类
private String getRole(Subject currentUser) {
	WebDelegatingSubject user = (WebDelegatingSubject) currentUser;
	WizardWebSecurityManager securityManager = (WizardWebSecurityManager) user
			.getSecurityManager();
	List<String> role = securityManager.getRoles(user.getPrincipals());
	return role.isEmpty() ? null : role.get(0);
}