bean的生命周期

bean的生命周期

//实体类
package com.msb.pojo;

public class Username {
    private Integer userid;
    private String username;
    private String password;

    public Username() {
        System.out.println("第一步，User方法构造");
    }
    public void initUsername(){
        System.out.println("第三步:User初始化");
    }
    public void destoryUser(){
        System.out.println("第五步:User销毁");
    }
    @Override
    public String toString() {
        return "Username{" +
                "userid=" + userid +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

    public Integer getUserid() {
        return userid;
    }

    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        System.out.println("第二步，User属性值");
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="username" class="com.msb.pojo.Username" init-method="initUsername" destroy-method="destoryUser" >
    <property name="username" value="小明" ></property>
    <property name="password" value="bbb" ></property>
    <property name="userid" value="11" ></property>
</bean>
    <bean class="com.msb.pojo.Processer" id="processer"></bean>
</beans>

注入后置处理器

package com.msb.pojo;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class Processer implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("全局bean初始化方法前执行");
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("全局bean初始化方法后执行");
        return bean;
    }
}

测试类

import com.msb.pojo.Demo1;
import com.msb.pojo.Username;
import javafx.application.Application;
import org.junit.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test2 {
    @Test
        public void test1(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext1.xml");
        Username demo1 = context.getBean("username", Username.class);
        System.out.println("第四步:User对象从容器中获取");
        System.out.println(demo1);
        context.close();
    }
}

pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>Spring</artifactId>
        <groupId>com.msb</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>SpringAll</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.5</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>