开发时使用，生产环境关闭

1.Adding devtools to your project

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

2.Adding plugin to your pom.xml

下段配置复制到项目pom.xml文件或者父类总工程的pom.xml中

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

3.Enabling automatic build

在idea中做如下设置

File -> Settings(New Project Settings->Settings for New Projects) ->Complier

下面项勾选

1. Automatically show first error in editor
2. Display notification on build completion
3. Build project automatically
4. Compile independent modules in parallel

4.Update the value of

在idea中，键入如下快捷键，使得idea允许热部署：

键入Ctrl + Shift + Alt + / ，（如果是mac，则快捷键是：Command + Shift + Alt + / ）打开Registry，勾选：

1. compiler.automake.allow.when.app.running
2. actionSystem.assertFocusAccessFromEdt

5.重启IDEA