Spring Boot热部署-spring-boot-devtools

<dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-devtools</artifactId>
       <optional>true</optional>
       <scope>true</scope>
</dependency>

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!--fork :  如果没有该项配置，可能devtools不会起作用 -->
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>