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