[feat] #29 제미나이 그라운딩

build.gradle

@@ -29,11 +29,13 @@ dependencies {
 	implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.7.0'
 	implementation 'org.springframework.boot:spring-boot-starter-validation'
 	implementation 'org.springframework.boot:spring-boot-starter-webflux'
+	implementation 'com.google.genai:google-genai:1.6.0'
 	compileOnly 'org.projectlombok:lombok'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 	runtimeOnly 'com.mysql:mysql-connector-j'
+
 }
 
 tasks.named('test') {

src/main/java/com/kernellabs/kernellabs/application/GeminiService.java

@@ -0,0 +1,46 @@
+package com.kernellabs.kernellabs.application;
+
+import autovalue.shaded.com.google.common.collect.ImmutableList;
+import com.google.genai.Client;
+import com.google.genai.types.GenerateContentConfig;
+import com.google.genai.types.GenerateContentResponse;
+import com.google.genai.types.GoogleSearch;
+import com.google.genai.types.Tool;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+@Service
+public class GeminiService {
+
+    private final Client client;
+    private final Tool googleSearchTool;
+    private final String modelName;
+
+    public GeminiService(
+        @Value("${gemini.api.key}") String apiKey,
+        @Value("${gemini.model:gemini-2.5-flash}") String modelName
+    ) {
+        this.client = Client.builder()
+            .apiKey(apiKey)
+            .build();
+
+        this.googleSearchTool = Tool.builder()
+            .googleSearch(GoogleSearch.builder().build())
+            .build();
+
+        this.modelName = modelName;
+    }
+
+    public String generateAnswer(String prompt) {
+        GenerateContentConfig config = GenerateContentConfig.builder()
+            .tools(ImmutableList.of(googleSearchTool))
+            .build();
+
+        // ← 여기를 client.models()가 아니라 client.models 로 접근
+        GenerateContentResponse res = client.models
+            .generateContent(modelName, prompt, config);
+
+        return res.text();
+    }
+
+}

src/main/java/com/kernellabs/kernellabs/presentation/controller/GeminiController.java

@@ -0,0 +1,37 @@
+package com.kernellabs.kernellabs.presentation.controller;
+
+import com.kernellabs.kernellabs.application.GeminiService;
+import jakarta.validation.Valid;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/genie")
+@AllArgsConstructor
+public class GeminiController {
+    private final GeminiService geminiService;
+
+    @PostMapping("/chat")
+    public ResponseEntity<ChatResponse> chat(@Valid @RequestBody ChatRequest req) {
+        String answer = geminiService.generateAnswer(req.getPrompt());
+        return ResponseEntity.ok(new ChatResponse(answer));
+    }
+
+    @Data
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class ChatRequest {
+        private String prompt;
+    }
+
+    @Data @NoArgsConstructor @AllArgsConstructor
+    public static class ChatResponse {
+        private String answer;
+    }
+}