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[오혜영] LLM 날씨 조회 제출합니다 #12

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[오혜영] LLM 날씨 조회 제출합니다 #12

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b833044
기능 요구 사항
eongoh Dec 16, 2025
6485510
Taewon
LGUTaewon Dec 16, 2025
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15 changes: 15 additions & 0 deletions build.gradle.kts
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Expand Up @@ -19,11 +19,22 @@ repositories {
mavenCentral()
}

extra["springCloudVersion"] = "2023.0.2"

dependencyManagement {
imports {
mavenBom("org.springframework.cloud:spring-cloud-dependencies:${property("springCloudVersion")}")
}
}

dependencies {
implementation(platform("org.springframework.ai:spring-ai-bom:1.1.2"))
implementation("org.springframework.boot:spring-boot-starter-data-jpa")
implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
implementation("org.springframework.boot:spring-boot-starter-validation")
implementation("org.springframework.boot:spring-boot-starter-web")
implementation("org.springframework.cloud:spring-cloud-starter-openfeign")
implementation("org.springframework.ai:spring-ai-starter-model-google-genai")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
implementation("org.flywaydb:flyway-core")
implementation("org.flywaydb:flyway-mysql")
Expand All @@ -33,6 +44,10 @@ dependencies {
testImplementation("org.springframework.boot:spring-boot-starter-test")
testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
testRuntimeOnly("org.junit.platform:junit-platform-launcher")

compileOnly("org.projectlombok:lombok")
annotationProcessor("org.projectlombok:lombok")

}

kotlin {
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9 changes: 9 additions & 0 deletions src/main/java/sunshine/Application.java
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Expand Up @@ -2,10 +2,19 @@

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableFeignClients
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}

@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
40 changes: 40 additions & 0 deletions src/main/java/sunshine/application/WeatherService.java
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package sunshine.application;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.ai.chat.model.ChatResponse;
import org.springframework.stereotype.Service;
import sunshine.domain.ClothingRecommendationService;
import sunshine.domain.GeocodingResponse;
import sunshine.domain.GeocodingService;
import sunshine.domain.WeatherDomainService;
import sunshine.domain.WeatherResponseDto;

@Slf4j
@Service
@RequiredArgsConstructor
public class WeatherService {

private final GeocodingService geocodingService;
private final WeatherDomainService weatherDomainService;
private final ClothingRecommendationService clothingRecommendationService;

public ChatResponse getWeather(String cityName) {
// 1. 권역 조회
GeocodingResponse geocode = geocodingService.geocode(cityName);

// 2. 날씨 조회
WeatherResponseDto weather = weatherDomainService.getWeather(geocode);

// 3. 복장 추천 (llm)
ChatResponse response = clothingRecommendationService.recommendClothing(weather);

// 토큰 사용량 로그 출력
log.info("Gemini API 토큰 사용량 - 입력 토큰: {}, 출력 토큰: {}, 총 토큰: {}",
response.getMetadata().getUsage().getPromptTokens(),
response.getMetadata().getUsage().getCompletionTokens(),
response.getMetadata().getUsage().getTotalTokens());

return response;
}
}
42 changes: 42 additions & 0 deletions src/main/java/sunshine/domain/City.java
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package sunshine.domain;

import lombok.Getter;

@Getter
public enum City {

Seoul("서울", "37.5665", "126.9780"),
Tokyo("도쿄", "35.6762", "139.6503"),
NewYork("뉴욕", "40.7128", "-74.0060"),
Paris("파리", "48.8566", "2.3522"),
London("런던", "51.5074", "-0.1278");

private final String cityKorName;
private final String latitude;
private final String longitude;

City(String cityKorName, String latitude, String longitude) {
this.cityKorName = cityKorName;
this.latitude = latitude;
this.longitude = longitude;
}

public static City getCityInfo(String cityName) {
for (City city : City.values()) {
if (city.name().equalsIgnoreCase(cityName)) {
return city;
}
}
throw new IllegalArgumentException("Invalid city name: " + cityName);
}

public static String getCityKorName(String cityName) {
for (City city : City.values()) {
if (city.name().equalsIgnoreCase(cityName)) {
return city.cityKorName;
}
}
throw new IllegalArgumentException("Invalid city name: " + cityName);
}

}
56 changes: 56 additions & 0 deletions src/main/java/sunshine/domain/ClothingRecommendationService.java
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package sunshine.domain;

import java.util.Map;
import org.springframework.ai.chat.client.ChatClient;
import org.springframework.ai.chat.messages.UserMessage;
import org.springframework.ai.chat.model.ChatResponse;
import org.springframework.ai.chat.prompt.Prompt;
import org.springframework.ai.chat.prompt.SystemPromptTemplate;
import org.springframework.stereotype.Service;

@Service
public class ClothingRecommendationService {

private final ChatClient client;

public ClothingRecommendationService(ChatClient.Builder builder) {
this.client = builder.build();
}

public ChatResponse recommendClothing(WeatherResponseDto weather) {
var systemPrompt = new SystemPromptTemplate("""
You are a helpful fashion advisor AI assistant.
You provide clothing recommendations based on weather conditions.
Your name is {name}.
You should reply in Korean and be friendly and practical.
""");
var system = systemPrompt.createMessage(Map.of("name", "StyleHelper"));

var userMessage = new UserMessage(String.format("""
현재 날씨 정보를 바탕으로 어떤 옷을 입으면 좋을지 추천해주세요.

- 기온: %s°C
- 체감온도: %s°C
- 습도: %s%%
- 날씨 상태: %s
- 강수량: %smm
- 비: %smm
- 눈: %smm

위 날씨 정보를 고려하여 상의, 하의, 신발, 필요한 액세서리를 추천해주세요.
""",
weather.getCurrent().getTemperature2m(),
weather.getCurrent().getApparentTemperature(),
weather.getCurrent().getRelativeHumidity2m(),
WeatherCode.getDescription(weather.getCurrent().getWeatherCode()),
weather.getCurrent().getPrecipitation(),
weather.getCurrent().getRain(),
weather.getCurrent().getSnowfall()
));
var prompt = new Prompt(userMessage, system);

return client.prompt(prompt)
.call()
.chatResponse();
}
}
12 changes: 12 additions & 0 deletions src/main/java/sunshine/domain/GeocodingResponse.java
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package sunshine.domain;

import lombok.Builder;
import lombok.Getter;

@Getter
@Builder
public class GeocodingResponse {
private double lat;
private double lon;
private String displayName;
}
78 changes: 78 additions & 0 deletions src/main/java/sunshine/domain/GeocodingService.java
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package sunshine.domain;

import com.fasterxml.jackson.databind.JsonNode;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.stereotype.Service;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.HttpServerErrorException;
import org.springframework.web.client.ResourceAccessException;
import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestTemplate;
import sunshine.domain.exception.ExternalApiException;
import sunshine.domain.exception.InvalidLocationException;

@Service
@RequiredArgsConstructor
public class GeocodingService {
private final RestTemplate restTemplate;

public GeocodingResponse geocode(String location) {
if (location == null || location.trim().isEmpty()) {
throw new InvalidLocationException("지역명이 비어있습니다.");
}

String url = "https://nominatim.openstreetmap.org/search?q=" + location + "&format=json&limit=1";

try {
HttpHeaders headers = new HttpHeaders();
headers.set("User-Agent", "Spring-Sunshine-Weather-App");
HttpEntity<String> entity = new HttpEntity<>(headers);

JsonNode[] response = restTemplate.exchange(
url,
HttpMethod.GET,
entity,
JsonNode[].class
).getBody();

// 응답이 null이거나 비어있는 경우
if (response == null || response.length == 0) {
throw new InvalidLocationException("지역을 찾을 수 없습니다: " + location);
}

JsonNode firstResult = response[0];

// 필수 필드 검증
if (!firstResult.has("lat") || !firstResult.has("lon") || !firstResult.has("display_name")) {
throw new ExternalApiException("Geocoding API 응답에 필수 필드가 없습니다.");
}

double lat = firstResult.get("lat").asDouble();
double lon = firstResult.get("lon").asDouble();
String displayName = firstResult.get("display_name").asText();

return new GeocodingResponse(lat, lon, displayName);

} catch (HttpClientErrorException e) {
// 4xx 에러: 클라이언트 오류 (재시도 불필요)
throw new ExternalApiException("Geocoding API 클라이언트 오류: " + e.getStatusCode(), e);
} catch (HttpServerErrorException e) {
// 5xx 에러: 서버 오류 (재시도 가능)
throw new ExternalApiException("Geocoding API 서버 오류: " + e.getStatusCode(), e);
} catch (ResourceAccessException e) {
// 네트워크 오류, 타임아웃
throw new ExternalApiException("Geocoding API 네트워크 오류 또는 타임아웃", e);
} catch (RestClientException e) {
// 기타 RestTemplate 예외
throw new ExternalApiException("Geocoding API 호출 실패", e);
} catch (Exception e) {
// JSON 파싱 오류 등 기타 예외
throw new ExternalApiException("Geocoding API 응답 처리 실패", e);
}
}
}


54 changes: 54 additions & 0 deletions src/main/java/sunshine/domain/WeatherCode.java
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package sunshine.domain;

public enum WeatherCode {
CLEAR_SKY(0, "맑음"),
MAINLY_CLEAR(1, "대체로 맑음"),
PARTLY_CLOUDY(2, "부분적으로 흐림"),
OVERCAST(3, "흐림"),
FOG(45, "안개"),
DEPOSITING_RIME_FOG(48, "서리 안개"),
DRIZZLE_LIGHT(51, "가벼운 이슬비"),
DRIZZLE_MODERATE(53, "이슬비"),
DRIZZLE_DENSE(55, "강한 이슬비"),
FREEZING_DRIZZLE_LIGHT(56, "가벼운 어는 이슬비"),
FREEZING_DRIZZLE_DENSE(57, "강한 어는 이슬비"),
RAIN_SLIGHT(61, "약한 비"),
RAIN_MODERATE(63, "비"),
RAIN_HEAVY(65, "강한 비"),
FREEZING_RAIN_LIGHT(66, "약한 어는 비"),
FREEZING_RAIN_HEAVY(67, "강한 어는 비"),
SNOW_SLIGHT(71, "약한 눈"),
SNOW_MODERATE(73, "눈"),
SNOW_HEAVY(75, "강한 눈"),
SNOW_GRAINS(77, "눈알갱이"),
RAIN_SHOWERS_SLIGHT(80, "약한 소나기"),
RAIN_SHOWERS_MODERATE(81, "소나기"),
RAIN_SHOWERS_VIOLENT(82, "강한 소나기"),
SNOW_SHOWERS_SLIGHT(85, "약한 눈 소나기"),
SNOW_SHOWERS_HEAVY(86, "강한 눈 소나기"),
THUNDERSTORM(95, "천둥번개"),
THUNDERSTORM_SLIGHT_HAIL(96, "약한 우박을 동반한 천둥번개"),
THUNDERSTORM_HEAVY_HAIL(99, "강한 우박을 동반한 천둥번개");

private final int code;
private final String description;

WeatherCode(int code, String description) {
this.code = code;
this.description = description;
}

public static String getDescription(String codeStr) {
try {
int code = Integer.parseInt(codeStr);
for (WeatherCode weatherCode : WeatherCode.values()) {
if (weatherCode.code == code) {
return weatherCode.description;
}
}
return "알 수 없는 날씨";
} catch (NumberFormatException e) {
return "알 수 없는 날씨";
}
}
}
7 changes: 7 additions & 0 deletions src/main/java/sunshine/domain/WeatherDomainClient.java
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package sunshine.domain;

public interface WeatherDomainClient {

WeatherResponseDto getWeather(double latitude, double longitude, String current);

}
16 changes: 16 additions & 0 deletions src/main/java/sunshine/domain/WeatherDomainService.java
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package sunshine.domain;

import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;

@Component
@RequiredArgsConstructor
public class WeatherDomainService {

private final WeatherDomainClient weatherDomainClient;

public WeatherResponseDto getWeather(GeocodingResponse geo) {
String current = "temperature_2m,relative_humidity_2m,apparent_temperature,precipitation,rain,showers,snowfall,weather_code";
return weatherDomainClient.getWeather(geo.getLat(), geo.getLon(), current);
}
}
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