spring boot 热部署

热部署的主要作用是在服务器运行的时候可以在不关闭服务器的情况下修改代码

可以很大的提高开发效率

热部署的步骤很简单

首先，需要在 pom.xml 文件中引入热部署需要的依赖

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

然后我们在每次修改代码后按 ctrl + F9 即可将代码更新

测试热部署是否生效

先启动spring boot 的 main 方法

    public static void main(String[] args) {
//        System.out.println("热部署测试");SpringApplication.run(SSMPApplication.class, args);}

然后我们将注释放开，按下 ctrl + F9,等待右下角读条结束后就会更新控制台信息：

 :: Spring Boot ::                (v2.5.4)

2024-09-23 22:18:27.534  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : Starting SSMPApplication using Java 17 on 大宝贝 with PID 14364 (E:\ideaItem\springboot_08_ssmp\target\classes started by 陈炫宇 in E:\ideaItem\text2)
2024-09-23 22:18:27.540  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : No active profile set, falling back to default profiles: default
2024-09-23 22:18:27.594  INFO 14364 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2024-09-23 22:18:27.594  INFO 14364 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2024-09-23 22:18:28.354  INFO 14364 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 80 (http)
2024-09-23 22:18:28.361  INFO 14364 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2024-09-23 22:18:28.361  INFO 14364 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.52]
2024-09-23 22:18:28.408  INFO 14364 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2024-09-23 22:18:28.408  INFO 14364 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 814 ms
2024-09-23 22:18:28.470  INFO 14364 --- [  restartedMain] c.a.d.s.b.a.DruidDataSourceAutoConfigure : Init DruidDataSource
2024-09-23 22:18:28.568  INFO 14364 --- [  restartedMain] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} inited
 _ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ 
     /               |         
                        3.4.3 
2024-09-23 22:18:28.987  INFO 14364 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2024-09-23 22:18:29.027  INFO 14364 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 80 (http) with context path ''
2024-09-23 22:18:29.027  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : Started SSMPApplication in 1.802 seconds (JVM running for 2.395)
2024-09-23 22:18:45.718  INFO 14364 --- [       Thread-5] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closing ...
2024-09-23 22:18:45.718  INFO 14364 --- [       Thread-5] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed
热部署测试

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.4)

2024-09-23 22:18:45.777  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : Starting SSMPApplication using Java 17 on 大宝贝 with PID 14364 (E:\ideaItem\springboot_08_ssmp\target\classes started by 陈炫宇 in E:\ideaItem\text2)
2024-09-23 22:18:45.779  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : No active profile set, falling back to default profiles: default
2024-09-23 22:18:45.938  INFO 14364 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 80 (http)
2024-09-23 22:18:45.942  INFO 14364 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2024-09-23 22:18:45.942  INFO 14364 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.52]
2024-09-23 22:18:45.966  INFO 14364 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2024-09-23 22:18:45.966  INFO 14364 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 186 ms
2024-09-23 22:18:45.992  INFO 14364 --- [  restartedMain] c.a.d.s.b.a.DruidDataSourceAutoConfigure : Init DruidDataSource
2024-09-23 22:18:46.029  INFO 14364 --- [  restartedMain] com.alibaba.druid.pool.DruidDataSource   : {dataSource-2} inited
 _ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ 
     /               |         
                        3.4.3 
2024-09-23 22:18:46.181  INFO 14364 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2024-09-23 22:18:46.196  INFO 14364 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 80 (http) with context path ''
2024-09-23 22:18:46.199  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : Started SSMPApplication in 0.442 seconds (JVM running for 19.555)
2024-09-23 22:18:46.201  INFO 14364 --- [  restartedMain] .ConditionEvaluationDeltaLoggingListener : Condition evaluation unchanged
2024-09-23 22:18:47.644  INFO 14364 --- [       Thread-7] com.alibaba.druid.pool.DruidDataSource   : {dataSource-2} closing ...
2024-09-23 22:18:47.647  INFO 14364 --- [       Thread-7] com.alibaba.druid.pool.DruidDataSource   : {dataSource-2} closed
热部署测试

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.4)

2024-09-23 22:18:47.693  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : Starting SSMPApplication using Java 17 on 大宝贝 with PID 14364 (E:\ideaItem\springboot_08_ssmp\target\classes started by 陈炫宇 in E:\ideaItem\text2)
2024-09-23 22:18:47.694  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : No active profile set, falling back to default profiles: default
2024-09-23 22:18:47.870  INFO 14364 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 80 (http)
2024-09-23 22:18:47.870  INFO 14364 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2024-09-23 22:18:47.873  INFO 14364 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.52]
2024-09-23 22:18:47.887  INFO 14364 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2024-09-23 22:18:47.887  INFO 14364 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 192 ms
2024-09-23 22:18:47.900  INFO 14364 --- [  restartedMain] c.a.d.s.b.a.DruidDataSourceAutoConfigure : Init DruidDataSource
2024-09-23 22:18:47.926  INFO 14364 --- [  restartedMain] com.alibaba.druid.pool.DruidDataSource   : {dataSource-3} inited
 _ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ 
     /               |         
                        3.4.3 
2024-09-23 22:18:48.029  INFO 14364 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2024-09-23 22:18:48.039  INFO 14364 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 80 (http) with context path ''
2024-09-23 22:18:48.044  INFO 14364 --- [  restartedMain] com.itheima.SSMPApplication              : Started SSMPApplication in 0.371 seconds (JVM running for 21.4)
2024-09-23 22:18:48.044  INFO 14364 --- [  restartedMain] .ConditionEvaluationDeltaLoggingListener : Condition evaluation unchanged