拦截器和全局异常处理

Question

我有个后置拦截器。当控制层被执行并返回信息时，后拦截器将被执行。此时，全局异常处理将捕获后拦截器中的异常，并返回提示消息。使用postman来测试和控制层的信息，同时返回全局异常处理。这真的是退回的吗？我写了一个测试示例。相同情况下，只返回控制层信息。我认为它应该返回全局异常处理的信息。

控制器

@RestController
@RequestMapping("/v1/book")
@Validated
public class BookController {

    private final BookService bookService;

    public BookController(BookService bookService) {
        this.bookService = bookService;
    }

    @GetMapping("/search")
    public R searchBook(@RequestParam(value = "q", required = false, defaultValue = "") String q) {
        return R.select(bookService.getBookByKeyword(q));
    }
}

拦截器

public class LogInterceptor extends HandlerInterceptorAdapter {

    public LogInterceptor(LoggerResolver loggerResolver) {
        this.loggerResolver = loggerResolver;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        // There will be a runtime exception here
    }
}

全局异常处理

@Order
@RestControllerAdvice
@Slf4j
public class RestExceptionHandler {

    /**
     * Exception
     */
    @ExceptionHandler({Exception.class})
    public R processException(Exception exception) {
        log.error("", exception);
        return R.error();
    }
}

结果

{
    "code": 200,
    "data": [
        // ...
    ],
    "type": "success",
    "message": "OK"
}{
    "code": 500,
    "type": "error",
    "message": "Internal Server Error"
}

"R扩展HashMap"，用于统一返回结构。

Answer 1

看一下您的代码片段，我不确定searchBook和processException中的R是什么

试试这个(编辑processException以满足您的规格)：

@GetMapping("/search")
public ResponseEntity<?> searchBook(@RequestParam(value = "q", required = false, defaultValue = "") String q) {
    return new ResponseEntity<>(bookService.getBookByKeyword(q), HttpStatus.OK);
}

@ExceptionHandler({Exception.class})
public ResponseEntity<?> processException(Exception exception) {
    return new ResponseEntity<>(new ErrorDTO(exception.getMessage()), HttpStatus.UNPROCESSABLE_ENTITY);
}