springMVC @RestControllerAdvice注解使用方式

import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
@RestControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
    // 处理自定义异常
    @ExceptionHandler(CustomException.class)
    public ResponseEntity<String> handleCustomException(CustomException ex, WebRequest request) {
        // 构造错误信息
        String error = "An error occurred: " + ex.getMessage();
        return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
    }
    // 可以添加更多的异常处理方法
}

public class PermissionException extends Exception{
    // 构造函数
    public PermissionException() {
        super();
    }
    public PermissionException(String message) {
        super(message);
    }
    public PermissionException(String message, Throwable cause) {
        super(message, cause);
    }
    public PermissionException(Throwable cause) {
        super(cause);
    }
}

@RestControllerAdvice
public class PermissionExceptionHandler {
    @ExceptionHandler(PermissionException.class)
    public Map handleMyCustomException(PermissionException ex) {
        Map<String, String> msg = new HashMap<>();
        msg.put("status","500");
        msg.put("msg","错误，没有权限");
        return  msg;
    }
}

/*
* preHandle在执行处理器方法之前执行
* postHandle在执行处理器方法之后执行
* afterCompletion在这次请求完成后执行
* */
@Component
public class PermissionInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String auth = request.getParameter("auth");
        System.out.println(auth);
        if ("0".equals(auth)){
            throw new PermissionException();
        }
        //返回true放行，返回false不放行
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private HandlerInterceptor permissionInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(permissionInterceptor)
                .addPathPatterns("/**") // 拦截所有请求
                .excludePathPatterns("/ignoreThis"); // 排除不需要拦截的请求
    }
}