这两个注解的功能类似标签中的init-method和destroy-method。分别在构造方法调用之后和实例释放资源之前被调用。
注解类：
package com.annotation.dao.impl;import org.springframework.context.annotation.Lazy;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;import com.annotation.dao.interfaces.InterfaceUserDao;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;/*** @copyright 2003-2025* @author qiao wei* @date 2025-03-24* @version 1.0* @brief 注解方式标注Bean，命名为“userDaoDao”，如果没有命名，则默认为类名首字母小写，即“userDaoImpl”。* @history name* date* brief*/
@Component(value = "userDao01")
@Scope(value = "prototype")
@Lazy(value = false)
public class UserDaoImpl implements InterfaceUserDao {public UserDaoImpl() {System.out.println("类的构造方法");}@Overridepublic void print() {System.out.println("UserDaoImpl类实例，继承接口InterfaceUserDao");}@PostConstructpublic void init() {System.out.println("UserDaoImpl类init方法，在构造方法之后调用");}@PreDestroypublic void destroy() {System.out.println("UserDaoImpl类destroy方法，在Bean销毁之前调用");}
}
测试：
package com.annotation.dao.impl;import org.junit.jupiter.api.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;import com.annotation.dao.interfaces.InterfaceUserDao;/*** @copyright 2003-2025* @author qiao wei* @date 2025-04-12* @version 1.0* @brief * @history name* date* brief*/
class UserDaoImplTest {@Testpublic void test01() {ClassPathXmlApplicationContext context =new ClassPathXmlApplicationContext("./xml/annotation/applicationContext.xml");InterfaceUserDao userDao = context.getBean("userDao01", InterfaceUserDao.class);userDao.print();context.close();}
}运行结果：
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