Spring Security-獲取當前登錄用戶的詳細信息

在Spring框架里面，可以通過以下幾種方式獲取到當前登錄用戶的詳細信息：

1. 在Bean中獲取用戶信息

Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
if (!(authentication instanceof AnonymousAuthenticationToken)) {
    String currentUserName = authentication.getName();
    return currentUserName;
}

Spring Security框架提供了多種AuthenticationToken的派生類，根據自己的應用場景，可以對SecurityContextHolder里面的AuthenticationToken進行類型轉換，如下：

UsernamePasswordAuthenticationToken authenticationToken = (UsernamePasswordAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
//details里面可能存放了當前登錄用戶的詳細信息，也可以通過cast后拿到
User userDetails = (User) authenticationToken.getDetails();

PS. AuthenticationToken的類型轉換同樣適用於下面提到的Principal類。

2. 在Controller中獲取用戶信息

1.通過Principal參數獲取：

import java.security.Principal;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class SecurityController {
 
    @RequestMapping(value = "/username", method = RequestMethod.GET)
    @ResponseBody
    public String currentUserName(Principal principal) {
        return principal.getName();
    }
}

2.通過Authentication參數獲取：

import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class SecurityController {
 
    @RequestMapping(value = "/username", method = RequestMethod.GET)
    @ResponseBody
    public String currentUserName(Authentication authentication) {
        return authentication.getName();
    }
}

3.通過HttpServletRequest獲取

import java.security.Principal;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class SecurityController {
 
    @RequestMapping(value = "/username", method = RequestMethod.GET)
    @ResponseBody
    public String currentUserNameSimple(HttpServletRequest request) {
        Principal principal = request.getUserPrincipal();
        return principal.getName();
    }
}

3. 通過Interface獲取用戶信息

通過Interface獲取其實和第一種在Bean中獲取用戶信息是一樣的，都是訪問SecurityContextHolder獲取的，只是進行了封裝。

public interface IAuthenticationFacade {
    Authentication getAuthentication();
}
@Component
public class AuthenticationFacade implements IAuthenticationFacade {
 
    @Override
    public Authentication getAuthentication() {
        return SecurityContextHolder.getContext().getAuthentication();
    }
}

下面是使用方法：

@Controller
public class SecurityController {
    @Autowired
    private IAuthenticationFacade authenticationFacade;
 
    @RequestMapping(value = "/username", method = RequestMethod.GET)
    @ResponseBody
    public String currentUserNameSimple() {
        Authentication authentication = authenticationFacade.getAuthentication();
        return authentication.getName();
    }
}