SpringBoot中@RestControllerAdvice注解的使用

import com.qing.emos.wx.exception.EmosException;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.authz.UnauthorizedException;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.*;
@Slf4j
//@RestControllerAdvice可以捕获SpringMVC异常
@RestControllerAdvice
public class ExceptionAdvice {
    @ResponseBody
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
//    ExceptionHandler用于全局捕获异常
    @ExceptionHandler(Exception.class)
    public String validExcepionHandler(Exception e){
        log.error("执行异常",e);
//        后端验证失败的异常，参数没传，或者传的不对
        if(e instanceof MethodArgumentNotValidException){
            MethodArgumentNotValidException exception = (MethodArgumentNotValidException) e;
            return exception.getBindingResult().getFieldError().getDefaultMessage();
        }
//        精简异常的内容，EmosException为自己定义异常
        else if(e instanceof EmosException){
            EmosException exception = (EmosException) e;
            return  exception.getMsg();
        }
//        未授权异常
        else if(e instanceof UnauthorizedException){
            return "你不具备相关权限";
        }
//       普通异常
        else {
            return "后端执行异常";
        }
    }
}