diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..42061c0
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+README.md
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..639900d
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..54d4228
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/spring-tutorial-21st.iml b/.idea/spring-tutorial-21st.iml
new file mode 100644
index 0000000..d6ebd48
--- /dev/null
+++ b/.idea/spring-tutorial-21st.iml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/README.md b/README.md
index ebeffaf..07ed7e7 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,109 @@
-# spring-tutorial-21st
-CEOS back-end 21st spring tutorial project
+Spring Tutorial 21st
+
+CEOS Back-end 21st Spring Tutorial Project
+
+시작하기 앞서...
+
+Spring도 Java도 처음 접하는 입장에서 시행착오를 겪으며 배운 내용을 정리했습니다.
+별의별 걸 다 적었다고 느끼실 수도 있지만... 자라나는 새싹을 본다는 마음으로 봐주세용.
+
+1. 서버(애플리케이션) 실행
+
+./gradlew bootRun
+
+bootRun 실행 시 SpringApplication.run()을 호출하여 @SpringBootApplication이 붙은 main 클래스를 실행합니다.
+
+
+2. 서버 실행 확인
+
+브라우저나 curl을 통해 확인 가능
+
+3. 의존성 추가 및 확인
+
+./gradlew dependencies
+
+dependencies 수정했다면 꼭 ./gradlew build --refresh-dependencies 하기
+
+이거 안 해서 Can't resolve 에러 많이 만났습니다...
+
+4. 어노테이션이란?
+
+어노테이션(Annotation)은 Java 코드에 추가적인 정보를 제공하는 특수한 기호입니다. @로 시작하며, 코드의 의미를 설명하고 특정 기능을 자동으로 수행할 수 있도록 도와줍니다.
+
+예제:
+
+@RestController // REST API를 처리하는 컨트롤러 선언
+@GetMapping("/") // HTTP GET 요청을 특정 메서드에 매핑
+
+5. 몰랐던 개념 정리
+
+인터페이스 : 클래스가 구현해야 할 메서드의 틀을 정의하는 것 (규칙 정하기)
+
+빈(Bean) : Spring이 관리하는 객체
+
+Spring 컨테이너 : 빈들을 생성하고 의존성을 자동으로 주입하는 공간
+
+static : 변수나 메서드가 클래스 자체에 속하며, 객체를 생성하지 않고도 사용 가능
+
+//빈이랑 컨테이너에 대해 더 찾아봤는데 생성, 소멸... 등등 잘 와닿지 않는 내용이 많았습니다.
+추가적으로 아래에 더 작성해두었습니다.
+
+6. 단위 테스트(Unit Test)
+
+**단위 테스트(Unit Test)**는 코드의 가장 작은 단위(메서드, 클래스)를 독립적으로 테스트하는 것을 의미합니다.
+
+7. 데이터베이스
+
+Spring Boot 데이터 계층 구성
+
+Domain : 모델 (Entity)
+
+Repository : 데이터 저장소 (JPA, MyBatis 등) DB에서 데이터 가져옴
+
+Service : 로직 처리 , 실제 로직 처리
+
+Controller : REST API 제공 => 요청 받고 응답 반환
+
+//Service와 Controller의 차이 => 데이터베이스 할 때 둘이 비슷하게 생겨서 뭔 차인지 싶어서 찾아보았습니다.
+Service가 로직을 처리하는 핵심, Controller는 요청받고 그 요청을 Service에게 전달하고 응답을 보내는 역할이라고 하더군요.
+
+TMI:
+
+마지막에 테이블 생성이 안 돼서 고생함. 알고 보니 Test 엔티티와 관련된 클래스들이 Application과 같은 패키지에 있어야 했음.
+
+느낀 점: Java 같은 객체지향언어가 처음인데 진짜 다 클래스로 나타내더라고요.
+신기했습니다. 아직 Java를 잘 몰라서 모든 코드를 완전 이해한 것은 아니지만 지금부터 차근차근 더 노력해보겠습니다.
+
+
+##스프링이 지원하는 기술
+
+Ioc(Inversion of Control) : 제어역전
+객체 생성, 주기 관리를 개발자가 아닌 Spring 컨테이너가 담당
+=> Spring이 알아서 해줘서 개발자가 편함(어노테이션을 통해서 구현함.)
+Ex. @Component, @Service, @Repositoty, @Controller => Bean 등록록
+
+
+DI (Dependency Injection) : 의존성 주입
+=> 객체 내부에서 다른 객체를 생성하는 게 아니라 외부에서 주입받음. 따라서 더 유연하게 작업할 수 있음(IoC와 마찬가지로 어노테이션을 통해 구현됨.)
+Ex. @Autowired
+
+AOP (Aspect-Oriented Programming)
+
+PSA (Portable Service Abstraction)
+
+##Spring Bean과 라이프사이클
+
+Spring Bean : Spring 컨테이너가 관리하는 객체 => IoC 구현
+=> 어노테이션 등을 사용해서 Bean으로 등록가능
+
+빈이 라이프사이클 :
+1. 객체 생성
+2. 의존성 주입(by @Autowired)
+3. 초기화
+4. 사용
+5. 소멸
+
+##어노테이션: 이걸 활용해서 spring이 특정 동작 수행
+
+
+통합테스트 : 여러 컴포넌트가 함께 동작하는지 검증하는 테스트트
\ No newline at end of file
diff --git a/spring-boot/.gitattributes b/spring-boot/.gitattributes
new file mode 100644
index 0000000..8af972c
--- /dev/null
+++ b/spring-boot/.gitattributes
@@ -0,0 +1,3 @@
+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary
diff --git a/spring-boot/.gitignore b/spring-boot/.gitignore
new file mode 100644
index 0000000..c2065bc
--- /dev/null
+++ b/spring-boot/.gitignore
@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/spring-boot/Readme b/spring-boot/Readme
new file mode 100644
index 0000000..4ebff31
--- /dev/null
+++ b/spring-boot/Readme
@@ -0,0 +1,29 @@
+
+Controller 작성
+어노테이션이란??
+=> Java 코드에 추가적인 정보를 제공하는 특수한 기호, @로 시작함,
+코드의 의미를 설명하고 자동으로 동작할 수 있도록 설명
+ex> @RestController, @GetMapping ...
+
+Application class 수정
+
+인터페이스 => 인터페이스는 클래스가 구현해야 할 메서드의 틀을 정의하는 것.(규칙 정하기)
+빈(Bean) => Spring이 관리하는 객체
+Spring 컨테이너 => 빈들을 관리하는 공간, 빈들을 생성하고 의존성을 자동으로 주입
+static => 변수나 메서드가 클래스 자체에 속하며, 객체를 생성하지 않고도 사용 가능
+args => arguments
+
+@SpringBootApplication = @Configuration(Spring 설정 파일) + @EnableAutoConfiguration(필요한 빈들을 자동 등록) + @ComponentScan(현재 패키지에서 Spring 빈을 찾아 등록)
+
+단위 테스트
+
+단위 테스트란 => 코드의 가장 작은 단위(메서드, 클래스)를 독립적으로 테스트하는 것
+
+데이터베이스
+
+TCP란? Transmission Control Protocal
+
+Domain : 모델
+Repository : 저장소
+Service : 로직 처리
+Controller : Rest API
\ No newline at end of file
diff --git a/spring-boot/build.gradle b/spring-boot/build.gradle
new file mode 100644
index 0000000..e9aaec3
--- /dev/null
+++ b/spring-boot/build.gradle
@@ -0,0 +1,38 @@
+plugins {
+ id 'java'
+ id 'org.springframework.boot' version '3.4.3'
+ id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'com.ceos21'
+version = '0.0.1-SNAPSHOT'
+
+java {
+ toolchain {
+ languageVersion = JavaLanguageVersion.of(21)
+ }
+}
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ implementation 'org.springframework.boot:spring-boot-starter-web'
+ testImplementation 'org.springframework.boot:spring-boot-starter-test'
+
+ implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+ compileOnly 'org.projectlombok:lombok'
+ annotationProcessor 'org.projectlombok:lombok'
+ runtimeOnly 'com.h2database:h2'
+
+ //testImplementation 'org.springframework:spring-test'
+
+
+ //testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+}
+
+tasks.named('test') {
+ useJUnitPlatform()
+}
diff --git a/spring-boot/gradle/wrapper/gradle-wrapper.jar b/spring-boot/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..9bbc975
Binary files /dev/null and b/spring-boot/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/spring-boot/gradle/wrapper/gradle-wrapper.properties b/spring-boot/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..37f853b
--- /dev/null
+++ b/spring-boot/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/spring-boot/gradlew b/spring-boot/gradlew
new file mode 100644
index 0000000..faf9300
--- /dev/null
+++ b/spring-boot/gradlew
@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+# Gradle start up script for POSIX generated by Gradle.
+#
+# Important for running:
+#
+# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+# noncompliant, but you have some other compliant shell such as ksh or
+# bash, then to run this script, type that shell name before the whole
+# command line, like:
+#
+# ksh Gradle
+#
+# Busybox and similar reduced shells will NOT work, because this script
+# requires all of these POSIX shell features:
+# * functions;
+# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+# * compound commands having a testable exit status, especially «case»;
+# * various built-in commands including «command», «set», and «ulimit».
+#
+# Important for patching:
+#
+# (2) This script targets any POSIX shell, so it avoids extensions provided
+# by Bash, Ksh, etc; in particular arrays are avoided.
+#
+# The "traditional" practice of packing multiple parameters into a
+# space-separated string is a well documented source of bugs and security
+# problems, so this is (mostly) avoided, by progressively accumulating
+# options in "$@", and eventually passing that to Java.
+#
+# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+# see the in-line comments for details.
+#
+# There are tweaks for specific operating systems such as AIX, CygWin,
+# Darwin, MinGW, and NonStop.
+#
+# (3) This script is generated from the Groovy template
+# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+# within the Gradle project.
+#
+# You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+ APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
+ [ -h "$app_path" ]
+do
+ ls=$( ls -ld "$app_path" )
+ link=${ls#*' -> '}
+ case $link in #(
+ /*) app_path=$link ;; #(
+ *) app_path=$APP_HOME$link ;;
+ esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+ echo "$*"
+} >&2
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in #(
+ CYGWIN* ) cygwin=true ;; #(
+ Darwin* ) darwin=true ;; #(
+ MSYS* | MINGW* ) msys=true ;; #(
+ NONSTOP* ) nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD=$JAVA_HOME/jre/sh/java
+ else
+ JAVACMD=$JAVA_HOME/bin/java
+ fi
+ if [ ! -x "$JAVACMD" ] ; then
+ die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+else
+ JAVACMD=java
+ if ! command -v java >/dev/null 2>&1
+ then
+ die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+ case $MAX_FD in #(
+ max*)
+ # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+ # shellcheck disable=SC2039,SC3045
+ MAX_FD=$( ulimit -H -n ) ||
+ warn "Could not query maximum file descriptor limit"
+ esac
+ case $MAX_FD in #(
+ '' | soft) :;; #(
+ *)
+ # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+ # shellcheck disable=SC2039,SC3045
+ ulimit -n "$MAX_FD" ||
+ warn "Could not set maximum file descriptor limit to $MAX_FD"
+ esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+# * args from the command line
+# * the main class name
+# * -classpath
+# * -D...appname settings
+# * --module-path (only if needed)
+# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+ APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+ CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+ JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ for arg do
+ if
+ case $arg in #(
+ -*) false ;; # don't mess with options #(
+ /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
+ [ -e "$t" ] ;; #(
+ *) false ;;
+ esac
+ then
+ arg=$( cygpath --path --ignore --mixed "$arg" )
+ fi
+ # Roll the args list around exactly as many times as the number of
+ # args, so each arg winds up back in the position where it started, but
+ # possibly modified.
+ #
+ # NB: a `for` loop captures its iteration list before it begins, so
+ # changing the positional parameters here affects neither the number of
+ # iterations, nor the values presented in `arg`.
+ shift # remove old arg
+ set -- "$@" "$arg" # push replacement arg
+ done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+# * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+# and any embedded shellness will be escaped.
+# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+# treated as '${Hostname}' itself on the command line.
+
+set -- \
+ "-Dorg.gradle.appname=$APP_BASE_NAME" \
+ -classpath "$CLASSPATH" \
+ org.gradle.wrapper.GradleWrapperMain \
+ "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+ die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+# set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+ printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+ xargs -n1 |
+ sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+ tr '\n' ' '
+ )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/spring-boot/gradlew.bat b/spring-boot/gradlew.bat
new file mode 100644
index 0000000..9d21a21
--- /dev/null
+++ b/spring-boot/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/spring-boot/settings.gradle b/spring-boot/settings.gradle
new file mode 100644
index 0000000..19b5204
--- /dev/null
+++ b/spring-boot/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'spring-boot'
diff --git a/spring-boot/src/main/java/com/ceos21/springboot/Application.java b/spring-boot/src/main/java/com/ceos21/springboot/Application.java
new file mode 100644
index 0000000..95bfe19
--- /dev/null
+++ b/spring-boot/src/main/java/com/ceos21/springboot/Application.java
@@ -0,0 +1,34 @@
+package com.ceos21.springboot;
+
+import org.springframework.boot.CommandLineRunner; //특정 코드를 실행하는 인터페이스
+import org.springframework.boot.SpringApplication; // Spring Boot 애플리케이션을 실행하는 클래스
+import org.springframework.boot.autoconfigure.SpringBootApplication;//Spring Boot 애플리케이션을 자동 설정하는 어노테이션
+import org.springframework.context.ApplicationContext;//Spring 컨테이너에서 빈(Bean)들을 관리하는 객체
+import org.springframework.context.annotation.Bean;//특정 객체를 Spring 빈으로 등록하는 어노테이션
+
+import java.util.Arrays;
+
+
+
+@SpringBootApplication
+public class Application {
+
+ public static void main(String[] args) {
+ SpringApplication.run(Application.class, args);
+
+ }
+
+ @Bean
+ public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
+ return args -> {
+ System.out.println("Let's inspect the beans provides by Spring Boot:");
+
+ String[] beanNames = ctx.getBeanDefinitionNames();
+ Arrays.sort(beanNames);
+ for (String beanName : beanNames) {
+ System.out.println(beanName);
+ }
+ };
+ }
+
+}
diff --git a/spring-boot/src/main/java/com/ceos21/springboot/GreetingController.java b/spring-boot/src/main/java/com/ceos21/springboot/GreetingController.java
new file mode 100644
index 0000000..d9ac628
--- /dev/null
+++ b/spring-boot/src/main/java/com/ceos21/springboot/GreetingController.java
@@ -0,0 +1,14 @@
+package com.ceos21.springboot;//패키지 선언 => 이 클래스가 해당 위치에 속한다.
+
+import org.springframework.web.bind.annotation.GetMapping; //GET 요청
+import org.springframework.web.bind.annotation.RestController; //REST API
+
+@RestController
+public class GreetingController {
+
+ @GetMapping("/")
+ public String index() {
+ return "Greetings from Spring Boot!";
+ }
+}
+//public(접근자) String(반환 타입) index(메서드 이름)
\ No newline at end of file
diff --git a/spring-boot/src/main/java/com/ceos21/springboot/Test.java b/spring-boot/src/main/java/com/ceos21/springboot/Test.java
new file mode 100644
index 0000000..b75f858
--- /dev/null
+++ b/spring-boot/src/main/java/com/ceos21/springboot/Test.java
@@ -0,0 +1,14 @@
+package com.ceos21.springboot;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import lombok.Data;
+
+@Data
+@Entity
+public class Test {
+
+ @Id
+ private Long id;
+ private String name;
+}
diff --git a/spring-boot/src/main/java/com/ceos21/springboot/TestController.java b/spring-boot/src/main/java/com/ceos21/springboot/TestController.java
new file mode 100644
index 0000000..172f2c8
--- /dev/null
+++ b/spring-boot/src/main/java/com/ceos21/springboot/TestController.java
@@ -0,0 +1,21 @@
+package com.ceos21.springboot;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping(value = "/tests")
+public class TestController {
+
+ private final TestService testService;
+
+ @GetMapping
+ public List findAllTests() {
+ return testService.findAllTests();
+ }
+}
diff --git a/spring-boot/src/main/java/com/ceos21/springboot/TestRepository.java b/spring-boot/src/main/java/com/ceos21/springboot/TestRepository.java
new file mode 100644
index 0000000..ab29641
--- /dev/null
+++ b/spring-boot/src/main/java/com/ceos21/springboot/TestRepository.java
@@ -0,0 +1,6 @@
+package com.ceos21.springboot;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface TestRepository extends JpaRepository {
+}
diff --git a/spring-boot/src/main/java/com/ceos21/springboot/TestService.java b/spring-boot/src/main/java/com/ceos21/springboot/TestService.java
new file mode 100644
index 0000000..2a2ecff
--- /dev/null
+++ b/spring-boot/src/main/java/com/ceos21/springboot/TestService.java
@@ -0,0 +1,20 @@
+package com.ceos21.springboot;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import java.util.List;
+
+
+@Service
+@RequiredArgsConstructor
+public class TestService {
+
+ private final TestRepository testRepository;
+
+ //다 가져오기
+ @Transactional(readOnly = true)
+ public List findAllTests() {
+ return testRepository.findAll();
+ }
+}
diff --git a/spring-boot/src/main/resources/application.yml b/spring-boot/src/main/resources/application.yml
new file mode 100644
index 0000000..158214c
--- /dev/null
+++ b/spring-boot/src/main/resources/application.yml
@@ -0,0 +1,17 @@
+spring:
+ datasource:
+ url: jdbc:h2:tcp://localhost/~/ceos21
+ username: sa
+ password:
+ driver-class-name: org.h2.Driver
+
+ jpa:
+ hibernate:
+ ddl-auto: create
+ properties:
+ hibernate:
+ format_sql: true
+
+logging:
+ level:
+ org.hibernate.SQL: debug
diff --git a/spring-boot/src/test/java/com/ceos21/springboot/ApplicationTests.java b/spring-boot/src/test/java/com/ceos21/springboot/ApplicationTests.java
new file mode 100644
index 0000000..5acc445
--- /dev/null
+++ b/spring-boot/src/test/java/com/ceos21/springboot/ApplicationTests.java
@@ -0,0 +1,13 @@
+package com.ceos21.springboot;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ApplicationTests {
+
+ @Test
+ void contextLoads() {
+ }
+
+}
diff --git a/spring-boot/src/test/java/com/ceos21/springboot/GreetingControllerTest.java b/spring-boot/src/test/java/com/ceos21/springboot/GreetingControllerTest.java
new file mode 100644
index 0000000..6a22227
--- /dev/null
+++ b/spring-boot/src/test/java/com/ceos21/springboot/GreetingControllerTest.java
@@ -0,0 +1,33 @@
+package com.ceos21.springboot;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+
+@SpringBootTest
+@AutoConfigureMockMvc
+public class GreetingControllerTest {
+
+ @Autowired
+ private MockMvc mvc;
+
+ @DisplayName("DisplayName : 테스트 이름을 설정할 수 있습니다.")
+ @Test
+ public void getGreeting() throws Exception {
+ mvc.perform(MockMvcRequestBuilders.get("/").accept(MediaType.APPLICATION_JSON))
+ .andExpect(status().isOk())
+ .andExpect(content().string(equalTo("Greetings from Spring Boot!")));
+
+ }
+}