一.添加依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
1.针对devtools的可以指定目录或者排除目录来进行热部署
#添加那个目录的文件需要restart
spring.devtools.restart.additional-paths=src/main/java
#排除那个目录的文件不需要restart
spring.devtools.restart.exclude=static/**,public/**
2.当我们再次启动 App.java 的时候，使用的加载器就变为了 restartedMain 了，说明热部署已经成功
"C:\Program Files\Java\jdk1.8.0_60\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -javaagent:D:\idea\apps\IDEA-U\ch-0\191.7479.19\lib\idea_rt.jar=64659:D:\idea\apps\IDEA-U\ch-0\191.7479.19\bin -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_60\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\rt.jar;D:\workSpace\demo\target\classes;D:\maven-repository\org\springframework\boot\spring-boot-starter-web\2.1.6.RELEASE\spring-boot-starter-web-2.1.6.RELEASE.jar;D:\maven-repository\org\springframework\boot\spring-boot-starter\2.1.6.RELEASE\spring-boot-starter-2.1.6.RELEASE.jar;D:\maven-repository\org\springframework\boot\spring-boot-starter-logging\2.1.6.RELEASE\spring-boot-starter-logging-2.1.6.RELEASE.jar;D:\maven-repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\maven-repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\maven-repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.2\log4j-to-slf4j-2.11.2.jar;D:\maven-repository\org\apache\logging\log4j\log4j-api\2.11.2\log4j-api-2.11.2.jar;D:\maven-repository\org\slf4j\jul-to-slf4j\1.7.26\jul-to-slf4j-1.7.26.jar;D:\maven-repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;D:\maven-repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;D:\maven-repository\org\springframework\boot\spring-boot-starter-json\2.1.6.RELEASE\spring-boot-starter-json-2.1.6.RELEASE.jar;D:\maven-repository\com\fasterxml\jackson\core\jackson-databind\2.9.9\jackson-databind-2.9.9.jar;D:\maven-repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;D:\maven-repository\com\fasterxml\jackson\core\jackson-core\2.9.9\jackson-core-2.9.9.jar;D:\maven-repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.9\jackson-datatype-jdk8-2.9.9.jar;D:\maven-repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.9\jackson-datatype-jsr310-2.9.9.jar;D:\maven-repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.9\jackson-module-parameter-names-2.9.9.jar;D:\maven-repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.6.RELEASE\spring-boot-starter-tomcat-2.1.6.RELEASE.jar;D:\maven-repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.21\tomcat-embed-core-9.0.21.jar;D:\maven-repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.21\tomcat-embed-el-9.0.21.jar;D:\maven-repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.21\tomcat-embed-websocket-9.0.21.jar;D:\maven-repository\org\hibernate\validator\hibernate-validator\6.0.17.Final\hibernate-validator-6.0.17.Final.jar;D:\maven-repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;D:\maven-repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;D:\maven-repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;D:\maven-repository\org\springframework\spring-web\5.1.8.RELEASE\spring-web-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\spring-beans\5.1.8.RELEASE\spring-beans-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\spring-webmvc\5.1.8.RELEASE\spring-webmvc-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\spring-aop\5.1.8.RELEASE\spring-aop-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\spring-context\5.1.8.RELEASE\spring-context-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\spring-expression\5.1.8.RELEASE\spring-expression-5.1.8.RELEASE.jar;D:\maven-repository\org\slf4j\slf4j-api\1.7.26\slf4j-api-1.7.26.jar;D:\maven-repository\org\springframework\spring-core\5.1.8.RELEASE\spring-core-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\spring-jcl\5.1.8.RELEASE\spring-jcl-5.1.8.RELEASE.jar;D:\maven-repository\org\springframework\boot\spring-boot-devtools\2.1.6.RELEASE\spring-boot-devtools-2.1.6.RELEASE.jar;D:\maven-repository\org\springframework\boot\spring-boot\2.1.6.RELEASE\spring-boot-2.1.6.RELEASE.jar;D:\maven-repository\org\springframework\boot\spring-boot-autoconfigure\2.1.6.RELEASE\spring-boot-autoconfigure-2.1.6.RELEASE.jar" com.example.demo.DemoApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.6.RELEASE)
2019-07-03 15:42:06.919 INFO 24868 --- [ restartedMain] com.example.demo.DemoApplication : Starting DemoApplication on sh-zongrb-02 with PID 24868 (D:\workSpace\demo\target\classes started by zongruibiao in D:\workSpace\demo)
2019-07-03 15:42:06.922 INFO 24868 --- [ restartedMain] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2019-07-03 15:42:06.957 INFO 24868 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2019-07-03 15:42:06.957 INFO 24868 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2019-07-03 15:42:07.740 INFO 24868 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-07-03 15:42:07.756 INFO 24868 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-07-03 15:42:07.757 INFO 24868 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.21]
2019-07-03 15:42:07.823 INFO 24868 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/demo] : Initializing Spring embedded WebApplicationContext
2019-07-03 15:42:07.823 INFO 24868 --- [ restartedMain] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 866 ms
2019-07-03 15:42:07.970 INFO 24868 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-07-03 15:42:08.073 INFO 24868 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2019-07-03 15:42:08.108 INFO 24868 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '/demo'
2019-07-03 15:42:08.110 INFO 24868 --- [ restartedMain] com.example.demo.DemoApplication : Started DemoApplication in 1.511 seconds (JVM running for 2.101)
注:如果热部署没有,请检查IDEA是否开启自动编译
3.IDEA开启自动编译
1.在idea 菜单栏点击File->Settings->Build, Execution, Deployment -> Compiler，勾选Build project automatically
1562231433(1).jpg
2回到idea界面，再页面使用快捷键Shift+Ctrl+Alt+/，打开Registry，
勾选：compiler.automake.allow.when.app.runningcompiler.automake.allow.when.app.running
1562231759(1).jpg
通过以上的设置就可以在不重启服务的情况下加载html。但如果修改.java文件，服务在几秒后会自动重启。如果不希望服务重启需要 在application.properties或application.yml中添加spring.devtools.reatart.enable=false。
如果要完全禁用重启,在 SpringApplication.run之前设置系统变量。
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
System.setProperty("spring.devtools.restart.enabled","false");
SpringApplication.run(DemoApplication.class, args);
}
}
