步驟一:寫個註解類指定該類作用到引數上

/**
 * 登入使用者資訊
 * @author Administrator
 *
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface LoginUser {

}

步驟二：寫個攔截器將使用者的user_id寫入到request域中,中間忽略許可權校驗的業務程式碼

/**
 * 許可權(Token)驗證
 * @author Administrator
 *
 */
@Component
public class AuthorizationInterceptor
 
 extends HandlerInterceptorAdapter {
    @Autowired
    private RedisUtil redisUtil;
    
    @Autowired
    private IDoctorService doctorService;

    public static final String USER_ID = "userId";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
 
 Object handler)
            throws Exception {
        IgnoreAuth annotation;
        if (handler instanceof HandlerMethod) {
            annotation = ((HandlerMethod) handler).getMethodAnnotation(IgnoreAuth.class);
        } else {
            return true;
        }
        // 如果有@IgnoreAuth註解，則不驗證token
 

        if (annotation != null) {
            return true;
        }
        // 從header中獲取token
        String token = request.getHeader("token");
        // 如果header中不存在token，則從引數中獲取token
        if (ValidatorUtil.isNull(token)) {
            token = request.getParameter("token");
        }
        // token為空
        if (ValidatorUtil.isNull(token)) {
            throw new BusinessException(ResponseEnum.PROHIBIT_VISIT.getCode(), ResponseEnum.PROHIBIT_VISIT.getMsg());
        }
        // 查詢token資訊
        String userId = redisUtil.get(RedisConstant.TOKEN_DOCTOR.concat(token));
        if (ValidatorUtil.isNull(userId)) {
        	Doctor doctor = doctorService.getByToken(token);
        	if (null == doctor || LocalDateTime.now().isAfter(doctor.getExpireTime())) {
        		throw new BusinessException(ResponseEnum.PROHIBIT_VISIT.getCode(), ResponseEnum.PROHIBIT_VISIT.getMsg());
			}
        	redisUtil.set(RedisConstant.TOKEN_DOCTOR.concat(doctor.getToken()), doctor.getId(), RedisConstant.DEFAULT_EXPIRE);
        	userId = String.valueOf(doctor.getId());
		}
        // 設定userId到request裡，後續根據userId，獲取使用者資訊
        request.setAttribute(USER_ID, Integer.valueOf(userId));
        return true;
    }

}

步驟三:寫個方法引數的解析器類給註解的實體賦值

**
 * 有@LoginUser註解的方法引數，注入當前登入使用者
 * @author Administrator
 *
 */
@Component
public class LoginUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
    @Autowired
    private IDoctorService doctorService;

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().isAssignableFrom(Doctor.class)
                && parameter.hasParameterAnnotation(LoginUser.class);
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer container, NativeWebRequest request,
            WebDataBinderFactory factory) throws Exception {
        // 獲取使用者名稱
        Object object = request.getAttribute(AuthorizationInterceptor.USER_ID, RequestAttributes.SCOPE_REQUEST);
        if (object == null) {
            return null;
        }
        // 獲取使用者資訊
        Doctor doctor = doctorService.getById((Integer) object);
        doctor.setPassword(null);
        doctor.setEsignPassword(null);
        return doctor;
    }

}

結果：請求帶此註解的方法引數已賦值