0.主启动类
public class HikariDataSourceApplication {
public static void main(String[] args) {
SpringApplication.run(HikariDataSourceApplication.class, args);
System.out.println("项目启动成功=====================================");
}
}1.@PostConstruct 注解
在项目初始化过程中，就会调用此方法。如果业务逻辑执行很耗时，可能会导致项目启动失败。
import jakarta.annotation.PostConstruct;
import org.springframework.stereotype.Component;
@Component
public class StartInit1 {
@PostConstruct
public void init() {
System.out.println("@PostConstruct===============================");
}
}2024-06-22T22:51:22.978+08:00 INFO 18120 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port 8080 (http)
2024-06-22T22:51:22.990+08:00 INFO 18120 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2024-06-22T22:51:22.990+08:00 INFO 18120 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.24]
2024-06-22T22:51:23.023+08:00 INFO 18120 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2024-06-22T22:51:23.024+08:00 INFO 18120 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 668 ms
@PostConstruct===============================
2024-06-22T22:51:23.303+08:00 WARN 18120 --- [ main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - idleTimeout is close to or more than maxLifetime, disabling it.
2024-06-22T22:51:23.304+08:00 INFO 18120 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2024-06-22T22:51:23.391+08:00 INFO 18120 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@46468f0
2024-06-22T22:51:23.393+08:00 INFO 18120 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2024-06-22T22:51:23.503+08:00 INFO 18120 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080 (http) with context path '/'
2024-06-22T22:51:23.509+08:00 INFO 18120 --- [ main] c.e.h.HikariDataSourceApplication : Started HikariDataSourceApplication in 1.415 seconds (process running for 1.729)
项目启动成功=====================================2.实现 CommandLineRunner 接口
项目初始化完毕后，才会调用方法，提供服务
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
@Component
public class StartInit2 implements CommandLineRunner {
@Override
public void run(String... args) {
System.out.println("CommandLineRunner====================");
}
}2024-06-22T22:54:34.798+08:00 INFO 14312 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port 8080 (http)
2024-06-22T22:54:34.806+08:00 INFO 14312 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2024-06-22T22:54:34.806+08:00 INFO 14312 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.24]
2024-06-22T22:54:34.845+08:00 INFO 14312 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2024-06-22T22:54:34.845+08:00 INFO 14312 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 660 ms
2024-06-22T22:54:35.128+08:00 WARN 14312 --- [ main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - idleTimeout is close to or more than maxLifetime, disabling it.
2024-06-22T22:54:35.128+08:00 INFO 14312 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2024-06-22T22:54:35.214+08:00 INFO 14312 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@3a0b6a
2024-06-22T22:54:35.215+08:00 INFO 14312 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2024-06-22T22:54:35.324+08:00 INFO 14312 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080 (http) with context path '/'
2024-06-22T22:54:35.328+08:00 INFO 14312 --- [ main] c.e.h.HikariDataSourceApplication : Started HikariDataSourceApplication in 1.408 seconds (process running for 1.722)
CommandLineRunner====================
项目启动成功===================================== 3.实现 ApplicationRunner 接口
同 CommandLineRunner。只是传参格式不一样。CommandLineRunner：没有任何限制；ApplicationRunner：key-value
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;
@Component
public class StartInit3 implements ApplicationRunner {
@Override
public void run(ApplicationArguments args) {
System.out.println("ApplicationRunner=================");
}
}2024-06-22T22:57:50.064+08:00 INFO 19228 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port 8080 (http)
2024-06-22T22:57:50.071+08:00 INFO 19228 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2024-06-22T22:57:50.071+08:00 INFO 19228 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.24]
2024-06-22T22:57:50.105+08:00 INFO 19228 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2024-06-22T22:57:50.105+08:00 INFO 19228 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 670 ms
2024-06-22T22:57:50.386+08:00 WARN 19228 --- [ main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - idleTimeout is close to or more than maxLifetime, disabling it.
2024-06-22T22:57:50.387+08:00 INFO 19228 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2024-06-22T22:57:50.481+08:00 INFO 19228 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@539c4830
2024-06-22T22:57:50.483+08:00 INFO 19228 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2024-06-22T22:57:50.601+08:00 INFO 19228 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080 (http) with context path '/'
2024-06-22T22:57:50.606+08:00 INFO 19228 --- [ main] c.e.h.HikariDataSourceApplication : Started HikariDataSourceApplication in 1.439 seconds (process running for 1.755)
ApplicationRunner=================
项目启动成功=====================================4.实现 ApplicationListener 接口
项目初始化完毕后，才会调用方法，提供服务。注意监听的事件，通常是 ApplicationStartedEvent 或者 ApplicationReadyEvent，其他的事件可能无法注入 bean。
- 如果监听的是 ApplicationStartedEvent 事件，则 ApplicationListener 一定会在 CommandLineRunner 和 ApplicationRunner 之前执行；
- 如果监听的是 ApplicationReadyEvent 事件，则 ApplicationListener 一定会在 CommandLineRunner 和
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
@Component
public class StartInit4 implements ApplicationListener<ApplicationStartedEvent> {
@Override
public void onApplicationEvent(ApplicationStartedEvent event) {
System.out.println("ApplicationListener================ApplicationStartedEvent");
}
}2024-06-22T23:01:14.615+08:00 INFO 21164 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port 8080 (http)
2024-06-22T23:01:14.627+08:00 INFO 21164 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2024-06-22T23:01:14.628+08:00 INFO 21164 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.24]
2024-06-22T23:01:14.661+08:00 INFO 21164 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2024-06-22T23:01:14.661+08:00 INFO 21164 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 683 ms
2024-06-22T23:01:14.942+08:00 WARN 21164 --- [ main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - idleTimeout is close to or more than maxLifetime, disabling it.
2024-06-22T23:01:14.942+08:00 INFO 21164 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2024-06-22T23:01:15.027+08:00 INFO 21164 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@6486fe7b
2024-06-22T23:01:15.028+08:00 INFO 21164 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2024-06-22T23:01:15.133+08:00 INFO 21164 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080 (http) with context path '/'
2024-06-22T23:01:15.138+08:00 INFO 21164 --- [ main] c.e.h.HikariDataSourceApplication : Started HikariDataSourceApplication in 1.429 seconds (process running for 1.752)
ApplicationListener================ApplicationStartedEvent
项目启动成功=====================================5.执行顺序
2024-06-22T23:03:22.206+08:00 INFO 19432 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2024-06-22T23:03:22.207+08:00 INFO 19432 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.24]
2024-06-22T23:03:22.244+08:00 INFO 19432 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2024-06-22T23:03:22.244+08:00 INFO 19432 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 613 ms
@PostConstruct===============================
2024-06-22T23:03:22.519+08:00 WARN 19432 --- [ main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - idleTimeout is close to or more than maxLifetime, disabling it.
2024-06-22T23:03:22.519+08:00 INFO 19432 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2024-06-22T23:03:22.604+08:00 INFO 19432 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@3e14d390
2024-06-22T23:03:22.605+08:00 INFO 19432 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2024-06-22T23:03:22.708+08:00 INFO 19432 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080 (http) with context path '/'
2024-06-22T23:03:22.716+08:00 INFO 19432 --- [ main] c.e.h.HikariDataSourceApplication : Started HikariDataSourceApplication in 1.317 seconds (process running for 1.573)
ApplicationListener================ApplicationReadyEvent
ApplicationRunner=================
CommandLineRunner====================
ApplicationListener================ApplicationReadyEvent
项目启动成功=====================================
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