1.定义一个CommonException类
2.定义一个全局异常捕获类GlobalExceptionHandler，添加@RestControllerAdvice注解
代码：

@Getter
public class CommonException extends RuntimeException {

    private final String code;

    private final String msg;

    public CommonException() {
        this.code = "400";
        this.msg = "操作失败";
    }

    public CommonException(String code, String msg) {
        this.code = code;
        this.msg = msg;
    }
}

@RestControllerAdvice
@Component
@Slf4j
public class GlobalExceptionHandler {

    @ExceptionHandler(CommonException.class)
    public ObjectResult commonExceptionHandler(CommonException e) {
        log.error("Catch CommonException：", e);
        return new ObjectResult(e.getCode(), e.getMsg());
    }

    @ExceptionHandler(RuntimeException.class)
    public ObjectResult runtimeExceptionHandler(RuntimeException e) {
        log.error("Catch RuntimeException：", e);
        return ObjectResult.error("操作失败");
    }

}