the first: through the @PostConstruct and @PreDestroy methods to achieve the operation performed before the initialization and destruction of the bean
The second is: by defining init-
The third method is to implement the InitializingBean and DisposableBean interfaces through beans.
The following demonstrates through @PostConstruct and @PreDestory
1: Define related implementation classes:
package com.myapp.core.annotation.init;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
public class PersonService {
private String message;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
@PostConstruct
public void init(){
System.out.println("I'm init method using @PostConstrut...."+message);
}
@PreDestroy
public void dostory(){
System.out.println("I'm destory method using @PreDestroy....."+message);
}
}
2: Define the relevant configuration files:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"> <context:annotation-config /> <bean id="personService" class="com.myapp.core.annotation.init.PersonService"> <property name="message" value="123"></property> </bean> </beans>
Where <context:annotation-config /> tells the spring container to use annotation configuration: scan annotation configuration
Test class:
package com.myapp.core.annotation.init;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("resource/annotation.xml");
PersonService personService = (PersonService)context.getBean("personService");
personService.dostory();
}
}
Among them, you can also tell the Spring container the commonly used annotation configuration method by declaring to load the org.springframework.context.annotation.CommonAnnotationBeanPostProcessor class:
just modify the configuration file to:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd">
<!-- <context:annotation-config /> -->
<bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" />
<bean id="personService" class="com.myapp.core.annotation.init.PersonService">
<property name="message" value="123"></property>
</bean>
</beans>
http://blog.csdn.net/topwqp/article/details/8681497
Spring loads bean instantiation orderhttp
://www.cnblogs.com/fanguangdexiaoyuer/p/5886050.html
Bean is in the process of instantiation:
Constructor > @PostConstruct > InitializingBean > init-method
http://sexycoding.iteye.com/blog/1046993
Bean initialization instance in Spring [important]
http://uule.iteye.com/blog/2094609