1)在pom中直接引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
2)设置以下两项 重要
1) “File” -> “Settings” -> “Build,Execution,Deplyment” -> “Compiler”,选中打勾 “Build project automatically”
2) 组合键:“Shift+Ctrl+Alt+/” ,选择 “Registry” ,选中打勾 “compiler.automake.allow.when.app.running”