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Initial commit: SB 백엔드 (Spring Boot + MyBatis)

- 사용자 CRUD REST API (/api/users)
- MariaDB(MyBatis) + Redis 캐싱 구성
- CORS 설정 및 헬스 체크 엔드포인트

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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src/main/java/com/example/sb_bt/SbBtApplication.java

@@ -0,0 +1,15 @@
+package com.example.sb_bt;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@MapperScan("com.example.sb_bt.mapper")
+public class SbBtApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SbBtApplication.class, args);
+	}
+
+}

src/main/java/com/example/sb_bt/config/CorsConfig.java

@@ -0,0 +1,23 @@
+package com.example.sb_bt.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+/**
+ * Vue 개발 서버(기본 5173)에서의 호출을 허용하기 위한 CORS 설정.
+ * 운영 환경에서는 allowedOrigins 를 실제 도메인으로 제한하세요.
+ */
+@Configuration
+public class CorsConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/api/**")
+                .allowedOrigins("http://localhost:5173")
+                .allowedMethods("GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS")
+                .allowedHeaders("*")
+                .allowCredentials(true)
+                .maxAge(3600);
+    }
+}

src/main/java/com/example/sb_bt/config/RedisConfig.java

@@ -0,0 +1,35 @@
+package com.example.sb_bt.config;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
+import org.springframework.data.redis.serializer.StringRedisSerializer;
+
+/**
+ * RedisTemplate 구성.
+ * - Key   : String 직렬화
+ * - Value : JSON 직렬화 (객체 저장 가능)
+ */
+@Configuration
+public class RedisConfig {
+
+    @Bean
+    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
+        RedisTemplate<String, Object> template = new RedisTemplate<>();
+        template.setConnectionFactory(connectionFactory);
+
+        StringRedisSerializer stringSerializer = new StringRedisSerializer();
+        GenericJackson2JsonRedisSerializer jsonSerializer =
+                new GenericJackson2JsonRedisSerializer(new ObjectMapper());
+
+        template.setKeySerializer(stringSerializer);
+        template.setHashKeySerializer(stringSerializer);
+        template.setValueSerializer(jsonSerializer);
+        template.setHashValueSerializer(jsonSerializer);
+        template.afterPropertiesSet();
+        return template;
+    }
+}

src/main/java/com/example/sb_bt/controller/HealthController.java

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+package com.example.sb_bt.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api")
+public class HealthController {
+
+    @GetMapping("/health")
+    public Map<String, Object> health() {
+        return Map.of(
+                "status", "UP",
+                "service", "sb_bt"
+        );
+    }
+}

src/main/java/com/example/sb_bt/controller/UserController.java

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+package com.example.sb_bt.controller;
+
+import com.example.sb_bt.domain.User;
+import com.example.sb_bt.service.UserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.net.URI;
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/users")
+@RequiredArgsConstructor
+public class UserController {
+
+    private final UserService userService;
+
+    @GetMapping
+    public List<User> list() {
+        return userService.findAll();
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<User> get(@PathVariable Long id) {
+        User user = userService.findById(id);
+        return user == null ? ResponseEntity.notFound().build() : ResponseEntity.ok(user);
+    }
+
+    @PostMapping
+    public ResponseEntity<User> create(@RequestBody User user) {
+        User created = userService.create(user);
+        return ResponseEntity.created(URI.create("/api/users/" + created.getId())).body(created);
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<User> update(@PathVariable Long id, @RequestBody User user) {
+        return ResponseEntity.ok(userService.update(id, user));
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> delete(@PathVariable Long id) {
+        userService.delete(id);
+        return ResponseEntity.noContent().build();
+    }
+}

src/main/java/com/example/sb_bt/domain/User.java

@@ -0,0 +1,25 @@
+package com.example.sb_bt.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+
+/**
+ * 샘플 도메인. users 테이블과 매핑.
+ * Redis 캐싱(JSON 직렬화)을 위해 Serializable 구현.
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class User implements Serializable {
+
+    private Long id;
+    private String name;
+    private String email;
+    private LocalDateTime createdAt;
+}

src/main/java/com/example/sb_bt/mapper/UserMapper.java

@@ -0,0 +1,24 @@
+package com.example.sb_bt.mapper;
+
+import com.example.sb_bt.domain.User;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
+
+/**
+ * MyBatis 매퍼. SQL 은 resources/mapper/UserMapper.xml 에 정의.
+ */
+@Mapper
+public interface UserMapper {
+
+    List<User> findAll();
+
+    User findById(@Param("id") Long id);
+
+    int insert(User user);
+
+    int update(User user);
+
+    int delete(@Param("id") Long id);
+}

src/main/java/com/example/sb_bt/service/UserService.java

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+package com.example.sb_bt.service;
+
+import com.example.sb_bt.domain.User;
+import com.example.sb_bt.mapper.UserMapper;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.Duration;
+import java.util.List;
+
+/**
+ * 샘플 서비스. 단건 조회 시 Redis 캐시를 사용하는 예시 포함.
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class UserService {
+
+    private final UserMapper userMapper;
+    private final RedisTemplate<String, Object> redisTemplate;
+
+    private static final String CACHE_KEY_PREFIX = "user:";
+    private static final Duration CACHE_TTL = Duration.ofMinutes(10);
+
+    public List<User> findAll() {
+        return userMapper.findAll();
+    }
+
+    public User findById(Long id) {
+        String key = CACHE_KEY_PREFIX + id;
+
+        Object cached = redisTemplate.opsForValue().get(key);
+        if (cached instanceof User user) {
+            log.debug("[cache hit] {}", key);
+            return user;
+        }
+
+        User user = userMapper.findById(id);
+        if (user != null) {
+            redisTemplate.opsForValue().set(key, user, CACHE_TTL);
+            log.debug("[cache put] {}", key);
+        }
+        return user;
+    }
+
+    @Transactional
+    public User create(User user) {
+        userMapper.insert(user);
+        return user;
+    }
+
+    @Transactional
+    public User update(Long id, User user) {
+        user.setId(id);
+        userMapper.update(user);
+        redisTemplate.delete(CACHE_KEY_PREFIX + id);
+        return userMapper.findById(id);
+    }
+
+    @Transactional
+    public void delete(Long id) {
+        userMapper.delete(id);
+        redisTemplate.delete(CACHE_KEY_PREFIX + id);
+    }
+}

src/main/resources/application.yml

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+server:
+  port: 8080
+  servlet:
+    context-path: /
+
+spring:
+  application:
+    name: sb_bt
+
+  # ===== MariaDB =====
+  datasource:
+    driver-class-name: org.mariadb.jdbc.Driver
+    url: jdbc:mariadb://localhost:3306/sb_db?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Seoul
+    username: sb_user
+    password: sb_pass
+    hikari:
+      maximum-pool-size: 10
+      minimum-idle: 2
+      connection-timeout: 30000
+      pool-name: sbHikariPool
+
+  # ===== Redis =====
+  data:
+    redis:
+      host: localhost
+      port: 6379
+      password:
+      database: 0
+      timeout: 3000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+
+# ===== MyBatis =====
+mybatis:
+  type-aliases-package: com.example.sb_bt.domain
+  mapper-locations: classpath:mapper/**/*.xml
+  configuration:
+    map-underscore-to-camel-case: true
+    jdbc-type-for-null: 'NULL'
+    default-fetch-size: 100
+    default-statement-timeout: 30
+
+# ===== Logging =====
+logging:
+  level:
+    root: INFO
+    com.example.sb_bt: DEBUG
+    com.example.sb_bt.mapper: DEBUG

src/main/resources/db/schema.sql

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+-- ============================================================
+-- sb_bt 초기 스키마 / 시드 데이터 (MariaDB)
+-- 사용법:
+--   1) MariaDB 접속 후 아래 DB/계정 생성 (관리자 권한)
+--   2) sb_db 선택 후 users 테이블 생성 및 시드 입력
+-- ============================================================
+
+-- 데이터베이스 및 계정 (최초 1회, root 등 관리자로 실행)
+CREATE DATABASE IF NOT EXISTS sb_db
+    DEFAULT CHARACTER SET utf8mb4
+    DEFAULT COLLATE utf8mb4_unicode_ci;
+
+CREATE USER IF NOT EXISTS 'sb_user'@'%' IDENTIFIED BY 'sb_pass';
+GRANT ALL PRIVILEGES ON sb_db.* TO 'sb_user'@'%';
+FLUSH PRIVILEGES;
+
+USE sb_db;
+
+-- 샘플 테이블
+CREATE TABLE IF NOT EXISTS users (
+    id          BIGINT       NOT NULL AUTO_INCREMENT,
+    name        VARCHAR(100) NOT NULL,
+    email       VARCHAR(255) NOT NULL,
+    created_at  DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    UNIQUE KEY uk_users_email (email)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 시드 데이터
+INSERT INTO users (name, email) VALUES
+    ('홍길동', 'hong@example.com'),
+    ('김철수', 'kim@example.com'),
+    ('이영희', 'lee@example.com')
+ON DUPLICATE KEY UPDATE name = VALUES(name);

src/main/resources/mapper/UserMapper.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.example.sb_bt.mapper.UserMapper">
+
+    <resultMap id="userResultMap" type="User">
+        <id property="id" column="id"/>
+        <result property="name" column="name"/>
+        <result property="email" column="email"/>
+        <result property="createdAt" column="created_at"/>
+    </resultMap>
+
+    <select id="findAll" resultMap="userResultMap">
+        SELECT id, name, email, created_at
+        FROM users
+        ORDER BY id DESC
+    </select>
+
+    <select id="findById" parameterType="long" resultMap="userResultMap">
+        SELECT id, name, email, created_at
+        FROM users
+        WHERE id = #{id}
+    </select>
+
+    <insert id="insert" parameterType="User" useGeneratedKeys="true" keyProperty="id">
+        INSERT INTO users (name, email, created_at)
+        VALUES (#{name}, #{email}, NOW())
+    </insert>
+
+    <update id="update" parameterType="User">
+        UPDATE users
+        SET name = #{name},
+            email = #{email}
+        WHERE id = #{id}
+    </update>
+
+    <delete id="delete" parameterType="long">
+        DELETE FROM users
+        WHERE id = #{id}
+    </delete>
+
+</mapper>

src/test/java/com/example/sb_bt/SbBtApplicationTests.java

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+package com.example.sb_bt;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SbBtApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}