Interceptor and global exception handling - spring-boot

Question

I have a post-interceptor. When the control layer is executed and returns information, the post-interceptor will be executed. At this time, an exception in the post-interceptor will be caught by the global exception handling and a prompt message will be returned. Use "postman" to test and control The information of layer and global exception handling is returned at the same time. Is this really returned? I wrote a test example. In the same situation, only the information of the control layer is returned. I think it should return the information of global exception handling.
Controller
#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));
}
}
Interceptor
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
}
}
Global Exception Handing
#Order
#RestControllerAdvice
#Slf4j
public class RestExceptionHandler {
/**
* Exception
*/
#ExceptionHandler({Exception.class})
public R processException(Exception exception) {
log.error("", exception);
return R.error();
}
}
Result
{
"code": 200,
"data": [
// ...
],
"type": "success",
"message": "OK"
}{
"code": 500,
"type": "error",
"message": "Internal Server Error"
}
"R extends HashMap<String, Object>", used to unify the return structure.

Answer 1

looking at your code snippet, I'm not sure what are those R in the searchBook and processException
try this (edit the processException to meet your specs):
#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);
}