Yes, statics are generally bad - generally, but in this case, the static is the most secure code you can write. Since the security context associates a Principal with the currently running thread, the most secure code would access the static from the thread as directly as possible. Hiding the access behind a wrapper class that is injected provides an attacker with more points to attack. They wouldn't need access to the code (which they would have a hard time changing if the jar was signed), they just need a way to override the configuration, which can be done at runtime or slipping some XML onto the classpath. Even using annotation injection in the signed code would be overridable with external XML. Such XML could inject the running system with a rogue principal. This is probably why Spring is doing something so un-Spring-like in this case.

如果你正在使用Spring 3，最简单的方法是:

 @RequestMapping(method = RequestMethod.GET)   
 public ModelAndView showResults(final HttpServletRequest request, Principal principal) {

     final String currentUser = principal.getName();

 }

The only problem is that even after authenticating with Spring Security, the user/principal bean doesn't exist in the container, so dependency-injecting it will be difficult. Before we used Spring Security we would create a session-scoped bean that had the current Principal, inject that into an "AuthService" and then inject that Service into most of the other services in the Application. So those Services would simply call authService.getCurrentUser() to get the object. If you have a place in your code where you get a reference to the same Principal in the session, you can simply set it as a property on your session-scoped bean.

我喜欢在freemarker页面上分享我支持用户详细信息的方法。 一切都很简单，工作完美!

你只需要在default-target-url上放置身份验证重新请求(表单登录后的页面) 这是我的那个页面的controller方法:

@RequestMapping(value = "/monitoring", method = RequestMethod.GET)
public ModelAndView getMonitoringPage(Model model, final HttpServletRequest request) {
    showRequestLog("monitoring");


    Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
    String userName = authentication.getName();
    //create a new session
    HttpSession session = request.getSession(true);
    session.setAttribute("username", userName);

    return new ModelAndView(catalogPath + "monitoring");
}

这是我的超光速代码:

<@security.authorize ifAnyGranted="ROLE_ADMIN, ROLE_USER">
<p style="padding-right: 20px;">Logged in as ${username!"Anonymous" }</p>
</@security.authorize> 

就是这样，用户名将出现在授权后的每一页。

我使用@Controller类中的@AuthenticationPrincipal注释以及@ controlleradvisor注释。例:

@ControllerAdvice
public class ControllerAdvicer
{
    private static final Logger LOGGER = LoggerFactory.getLogger(ControllerAdvicer.class);


    @ModelAttribute("userActive")
    public UserActive currentUser(@AuthenticationPrincipal UserActive currentUser)
    {
        return currentUser;
    }
}

其中UserActive是我用于已登录用户服务的类，并且扩展自org.springframework.security.core.userdetails.User。喜欢的东西:

public class UserActive extends org.springframework.security.core.userdetails.User
{

    private final User user;

    public UserActive(User user)
    {
        super(user.getUsername(), user.getPasswordHash(), user.getGrantedAuthorities());
        this.user = user;
    }

     //More functions
}

真的很容易。

您可以使用Spring AOP方法。 例如，如果你有一些服务，它需要知道当前的本金。您可以引入自定义注释，例如@Principal，它表明该服务应该是依赖于主体的。

public class SomeService {
    private String principal;
    @Principal
    public setPrincipal(String principal){
        this.principal=principal;
    }
}

然后在您的通知中，我认为需要扩展MethodBeforeAdvice，检查特定的服务有@Principal注释并注入Principal名称，或者将其设置为'ANONYMOUS'。