0、参考、业务需求
- 参考:
https://www.cnblogs.com/java-chen-hao/p/11835120.html#_label1
https://zhuanlan.zhihu.com/p/541268993
- 业务需求:
缓存数据字典数据、初始化线程池、提前加载好加密证书
1、方式
- 实现 ApplicationRunner 接口
- 实现 CommandLineRunner 接口
- 实现 InitializingBean 接口
- 使用 @PostConstruct 标签
2、@Order
- 可以使用@Order注解或Ordered接口改变 ApplicationRunner 和 CommandLineRunner执行顺序
- @Order 对 InitializingBean 和 @PostConstruct 不生效。
3、测试使用
- ApplicationRunner
@Component
@Order(3)
public class App01 implements ApplicationRunner {
@Override
public void run(ApplicationArguments args) throws Exception {
System.out.println("App01_执行了……@Order(3)");
}
}
@Component
@Order(2)
public class App02 implements ApplicationRunner {
@Override
public void run(ApplicationArguments args) throws Exception {
System.out.println("App02_执行了……@Order(2)");
}
}
- CommandLineRunner
@Component
@Order(1)
public class Com01 implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
System.out.println("Com01_执行了……@Order(1)");
}
}
@Component
@Order(0)
public class Com02 implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
System.out.println("Com02_执行了……@Order(0)");
}
}
- InitializingBean
/** @Order没用
* @author CC
* @since 2023/5/17 0017
*/
@Component
@Order(7)
public class Ini01 implements InitializingBean {
@Override
public void afterPropertiesSet() throws Exception {
System.out.println("Ini01_执行了……@Order(7)");
}
}
/** @Order没用
* @author CC
* @since 2023/5/17 0017
*/
@Component
@Order(4)
public class Ini02 implements InitializingBean {
@Override
public void afterPropertiesSet() throws Exception {
System.out.println("Ini02_执行了……@Order(4)");
}
}
- @PostConstruct
/** @Order没用
* @author CC
* @since 2023/5/17 0017
*/
@Component
@Order(6)
public class Pos01 {
@PostConstruct
public void customizeName(){
System.out.println("Pos01_执行了……@Order(6)");
}
}
/** @Order没用
* @author CC
* @since 2023/5/17 0017
*/
@Component
@Order(5)
public class Pos02 {
@PostConstruct
public void customizeName(){
System.out.println("Pos02_执行了……@Order(5)");
}
}
4、执行顺序、建议使用
- 通过实现得出执行顺序
InitializingBean > @PostConstruct > ApplicationRunner > CommandLineRunner
- 没有执行顺序要求,使用:@PostConstruct
- 有执行顺序要求,使用:ApplicationRunner(推荐)或者CommandLineRunner