使用openweather API的restful webservice的问题？

Question

我试图从openweathermap api中检索天气细节，一些我无法使其工作的原因如下错误。如有任何帮助，我将不胜感激

@Controller
public class CurrentWeatherController {
 
    private final StubWeatherService stubWeatherService;
    private final LiveWeatherService liveWeatherService;
 
    public CurrentWeatherController(StubWeatherService stubWeatherService, LiveWeatherService liveWeatherService) {
        this.stubWeatherService = stubWeatherService;
        this.liveWeatherService = liveWeatherService;
    }
 
    @GetMapping("/current-weather")
    public String getCurrentWeather(Model model) {
        model.addAttribute("currentWeather", liveWeatherService.getCurrentWeather("Detroit","us"));
        return "current-weather";
    }

    public StubWeatherService getStubWeatherService() {
        return stubWeatherService;
    }

服务代码

@Service
public class LiveWeatherService {

    private static final String WEATHER_URL = "http://api.openweathermap.org/data/2.5/weather?q={city},{country}&APPID={key}&units=metric";

    private final String apiKey="526a647fcd4f3f465c0340c19d26ef3a";

    private final RestTemplate restTemplate;
    private final ObjectMapper objectMapper;

    public LiveWeatherService(RestTemplateBuilder restTemplateBuilder, ObjectMapper objectMapper) {
        this.restTemplate = restTemplateBuilder.build();
        this.objectMapper = objectMapper;
    }

    public CurrentWeather getCurrentWeather(String city, String country) {
        URI url = new UriTemplate(WEATHER_URL).expand(city, country,this.apiKey);    // line 34 issue with accepting apikey 
        ResponseEntity<String> response = restTemplate.getForEntity(url, String.class);

        return convert(response);
    }

    private CurrentWeather convert(ResponseEntity<String> response) {
        try {
            JsonNode root = objectMapper.readTree(response.getBody());
            return new CurrentWeather(root.path("weather").get(0).path("main").asText(),
                    BigDecimal.valueOf(root.path("main").path("temp").asDouble()),
                    BigDecimal.valueOf(root.path("main").path("feels_like").asDouble()),
                    BigDecimal.valueOf(root.path("wind").path("speed").asDouble()));
        } catch (JsonProcessingException e) {
            throw new RuntimeException("Error parsing JSON", e);
        }
    }
}

错误

2-07 02:34:48.710错误43384---[nio-8080-exec-3]O.A.C.C.C.[.[.[/].[dispatcherServlet]:路径为[]的上下文中servlet[dispatcherServlet]的servlet.service（）引发异常[处理程序调度失败；嵌套异常为java.lang.ERROR：未解决的编译问题：类型不匹配：无法从UriTemplate转换为URI]有根本原因

java.lang.Error: Unresolved compilation problem: 
  Type mismatch: cannot convert from UriTemplate to URI

  at com.meshupProjekt.service.LiveWeatherService.getCurrentWeather(LiveWeatherService.java:34)

Answer 1

对我来说，您的代码是这样工作的:

    String WEATHER_URL = "http://api.openweathermap.org/data/2.5/weather?q={city},{country}&APPID={key}&units=metric";
    String apiKey = "526a647fcd4f3f465c0340c19d26ef3a";
    var x = new UriTemplate(WEATHER_URL).expand("Darmstadt", "Deutschland", apiKey);
    System.out.println(x);

而不是URI，我使用了var，以便Java选择正确的类型。
您的编译错误可能是由URI类的错误导入引起的。