结论:
代码语言:javascript复制/**
* step1:执行构造函数
* step2:执行使用@PostConstruct注解修饰的方法
* step3:执行@Bean注解中initMethod参数指定的方法
*/
Talk is cheap,show me the code... 上码:
定义的示例Bean:
代码语言:javascript复制@Slf4j
public class InitBean {
public InitBean() {
log.info("Step1:begin to execute Constructor Function");
}
public void initMethod() {
log.info("Step3:begin to execute initMethod");
}
@PostConstruct
public void postConstructMethod1() {
log.info("Step2:begin to execute postConstructMethod1 with @PostConstruct");
}
@PostConstruct
public void postConstructMethod2() {
log.info("Step2:begin to execute postConstructMethod2 with @PostConstruct");
}
}
Java Config方式进行Bean的初始化:
代码语言:javascript复制@Configuration
public class InitBeanConfig {
@Bean(initMethod = "initMethod")
public InitBean initBean() {
return new InitBean();
}
}
测试用例:
代码语言:javascript复制@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = InitBeanConfig.class)
public class InitBeanConfigTest {
@Test
public void givenBean_WhenInit_thenFirstConstructorFunction_SecondPostConstructAnna_ThirdInitMethod() {
/**
* step1:执行构造函数
* step2:执行使用@PostConstruct注解修饰的方法
* step3:执行@Bean注解中initMethod参数指定的方法
*/
}
}
执行结果:
代码语言:javascript复制2019-01-06 22:16:03.362 INFO 21944 --- [main] c.t.learning.init.spring.InitBean : Step1:begin to execute Constructor Function
2019-01-06 22:16:03.377 INFO 21944 --- [main] c.t.learning.init.spring.InitBean : Step2:begin to execute postConstructMethod1 with @PostConstruct
2019-01-06 22:16:03.378 INFO 21944 --- [main] c.t.learning.init.spring.InitBean : Step2:begin to execute postConstructMethod2 with @PostConstruct
2019-01-06 22:16:03.378 INFO 21944 --- [main] c.t.learning.init.spring.InitBean : Step3:begin to execute initMethod
2019-01-06 22:16:03.461 INFO 21944 --- [main] c.t.l.init.spring.InitBeanConfigTest: Started InitBeanConfigTest in 3.548 seconds (JVM running for 5.781)
温馨提示: 如果存在多个使用注解@PostConstruct修饰的方法,则这几个方法的执行顺序不确定
代码: https://github.com/helloworldtang/spring-boot-cookbook/blob/v1.0.2-thymeleaf/learning-demo/src/main/java/com/tangcheng/learning/init/spring/InitBean.java