从 openweather Api 使用 Restful Web 服务的问题？

问题描述

我试图从 openweathermap api 检索天气详细信息，有些原因我无法使用以下错误来处理它。任何帮助将不胜感激

控制器

@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] : Servlet.service() 用于 带有路径 [] 的上下文中的 servlet [dispatcherServlet] 抛出异常 [处理程序调度失败；嵌套异常是 java.lang.Error： 未解决的编译问题： 类型不匹配：无法从 UriTemplate 转换为 URI ] 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)

~[类/:na] 在 com.meshupProjekt.controller.CurrentWeatherController.getCurrentWeather(CurrentWeatherController.java:36) ~[班级/:na] 在 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 方法）~[na:na] 在 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[无：无] 在 java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[无：无] 在 java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na] 在 org.springframework.web.method.support.invocableHandlerMethod.doInvoke(invocableHandlerMethod.java:197) ~[spring-web-5.3.2.jar:5.3.2] 在 org.springframework.web.method.support.invocableHandlerMethod.invokeForRequest(invocableHandlerMethod.java:141) ~[spring-web-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.mvc.method.annotation.ServletinvocableHandlerMethod.invokeAndHandle(ServletinvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.dispatcherServlet.dodispatch(dispatcherServlet.java:1061) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.dispatcherServlet.doService(dispatcherServlet.java:961) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[tomcat-embed-core-9.0.41.jar:4.0.FR] 在 org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.41.jar:4.0.FR] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.41.jar:9.0.41] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41] 在 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.41.jar:9.0.41] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41] 在 org.springframework.web.servlet.resource.ResourceUrlEncodingFilter.doFilter(ResourceUrlEncodingFilter.java:67) ~[spring-webmvc-5.3.2.jar:5.3.2] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41] 在 org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[弹簧-

解决方法

对我来说，你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);

我使用了 URI 而不是 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。