1、引入依赖

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<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
</dependency>

2、修改插件

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<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <dependencies>
                    <!-- spring热部署-->
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>springloaded</artifactId>
                        <version>1.2.6.RELEASE</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
</build>

3、修改编译器
** 打开自动编译

4、启动项目

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mvn spring-boot:run