SpringBoot天气预报小程序

package org.example.weatherapp.service; import org.example.weatherapp.model.CityCodeMap; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.web.client.RestTemplate; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; @Service public class WeatherService { private static final String API_URL = "http://t.weather.sojson.com/api/weather/city/{cityCode}"; @Autowired private RestTemplate restTemplate; public JsonNode getWeather(String cityName) { String cityCode = CityCodeMap.getCityCode(cityName); if (cityCode == null) { return createErrorResponse("未找到对应的城市编码"); } String response = restTemplate.getForObject(API_URL, String.class, cityCode); ObjectMapper objectMapper = new ObjectMapper(); try { return objectMapper.readTree(response); } catch (Exception e) { return createErrorResponse("解析JSON数据失败"); } } private JsonNode createErrorResponse(String message) { ObjectMapper objectMapper = new ObjectMapper(); return objectMapper.createObjectNode() .put("status", 400) .put("message", message); } }