修改 HTTP GET 请求中的请求参数，同时将其传递给控制器

Question

我需要修改GET URL“http://localhost:8081/qeats/v1/restaurants?latitude=87.97864&longitude=20.82345”中的请求参数，同时将其发送到spring boot控制器，以便纬度和经度值只精确到小数点后一位。例如“http://localhost:8081/qeats/v1/restaurants?latitude=87.9&longitude=20.8”

@GetMapping(RESTAURANTS_API)
  public ResponseEntity<GetRestaurantsResponse> getRestaurants(
  @RequestParam Double latitude,
  @RequestParam Double longitude, GetRestaurantsRequest getRestaurantsRequest) {
        
  
log.info("getRestaurants called with {}", getRestaurantsRequest);

GetRestaurantsResponse getRestaurantsResponse;

if (getRestaurantsRequest.getLatitude() != null && getRestaurantsRequest.getLongitude() != null
    && getRestaurantsRequest.getLatitude() >= -90 
      && getRestaurantsRequest.getLatitude() <= 90
        && getRestaurantsRequest.getLongitude() >= -180 
          && getRestaurantsRequest.getLongitude() <= 180) {

  getRestaurantsResponse = restaurantService.findAllRestaurantsCloseBy(
      getRestaurantsRequest, LocalTime.now());
  log.info("getRestaurants returned {}", getRestaurantsResponse);
  return ResponseEntity.ok().body(getRestaurantsResponse);
} else {
  return ResponseEntity.badRequest().body(null);
}

Answer 1

您可以添加自定义Formatter or Converter，例如：

1. 实现自定义Formatter：

    public class MyDoubleFormatter implements Formatter<Double> {

        private final DecimalFormat decimalFormat = new DecimalFormat("#.#");

        @Override
        public Double parse(String text, Locale locale) {
            return Double.parseDouble(decimalFormat.format(Double.parseDouble(text)));
        }

        @Override
        public String print(Double value, Locale locale) {
            return value.toString();
        }
    }

1. 注册自定义Formatter:

    @Configuration
    @EnableWebMvc
    public class WebConfig implements WebMvcConfigurer {

        @Override
        public void addFormatters(FormatterRegistry registry) {
            registry.addFormatter(new MyDoubleFormatter());
        }
    }