# Spring

提供一個 all-in-one 的開發環境（設定）， 基本上是下面幾個要點組成， 所以不一定要用 \[spring initializr] 產生：

* pom.xml

  ```markup
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>版本號碼</version>
        <relativePath/>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 開發階段用 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>    
        <dependency>
            <!-- 偵測檔案變動自動重起 Tomcat -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
  ```
* 傳統 Java application class

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

也不需要 `mvnw`，直接下 `mvn spring-boot:run` 就行。

\[spring initializr]: <http://start.spring.io>


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