Step1:添加maven依赖

添加devtools依赖，并修改插件配置

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

<build>
	<plugins>
		<plugin>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-maven-plugin</artifactId>
			<configuration>
				<fork>true</fork>
			</configuration>
		</plugin>
	</plugins>
</build>

Step2:修改设置

1. File->Settings->Build,Execution,Deployment->Compiler->勾选Builde project automatically
2. Ctrl+Shift+Alt+/,点击Registry,勾选compiler.automake.allow.when.app.running