# Spring Boot
- https://github.com/spring-projects/spring-boot

## Goals
- 매우 빠른 스프링 개발 가능
- 기본도 충실하지만, 요구사항 변화에 빨리 대응
- 다양한 비기능 특징 제공(임베디드 서버, 보안, 메트릭, 헬스 체크, 외부 설정)

## Simple Example
- https://start.spring.io
- spring boot 기본 앱 생성
- Example.java

```java
package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication {

  public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
  }

  @GetMapping("/hello")
  public String hello(@RequestParam(value = "name", defaultValue = "World") String name) {
    return String.format("Hello %s!", name);
  }
}
```

- pom.xml

```xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example</groupId>
  <artifactId>myproject</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.BUILD-SNAPSHOT</version>
  </parent>

  <!-- Additional lines to be added here... -->
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>

  <!-- (you don't need this if you are using a .RELEASE version) -->
  <repositories>
    <repository>
      <id>spring-snapshots</id>
      <url>http://repo.spring.io/snapshot</url>
      <snapshots><enabled>true</enabled></snapshots>
    </repository>
    <repository>
      <id>spring-milestones</id>
      <url>http://repo.spring.io/milestone</url>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>spring-snapshots</id>
      <url>http://repo.spring.io/snapshot</url>
    </pluginRepository>
    <pluginRepository>
      <id>spring-milestones</id>
      <url>http://repo.spring.io/milestone</url>
    </pluginRepository>
  </pluginRepositories>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>
```

## Executable JAR,WAR
- 리눅스에서 단독 실행 가능한 `*.jar`, `*.war`
- 윈도우는 `java -jar` 필요
- `pom.xml`
```xml
<plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  <version>1.5.8.RELEASE</version>
  <configuration>
    <executable>true</executable>
  </configuration>
</plugin>
```

- 실행
```
./spring-boot-jsp.jar
```

## Spring Boot as a Service
- Executable JAR 필요
- 심볼릭 링크 이용
- `sudo service myapp start`, `stop`, `restart` 가능
```
chmod 755 /path/to/myspringboot.jar
sudo ln -s /path/to/myspringboot.jar /etc/init.d/myapp
```
- run
```
sudo service myapp start
curl localhost:8080
```
- stop
```
sudo service myapp stop
sudo rm /etc/init.d/myapp
```

- ref : https://stackoverflow.com/questions/21503883/spring-boot-application-as-a-service

## Migration to Spring Boot
- http://www.baeldung.com/spring-boot-migration

- pom.xml

```
<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>1.5.6.RELEASE</version>
</parent>
```

## related
- [Spring Boot 2](/mib/spring/boot2)