Contoh analisis pengurusan kitaran hayat Java Spring Bean

Pengurusan kitaran hayat Spring Bean

1. 🎜>2. Nyatakan kaedah permulaan dan pemusnahan Bean melalui parameter @Bean (initMethod, destroyMethod)

1 Struktur projek

通过以下方式来指定Bean的初始化和销毁方法，
当Bean为单例时，Bean归Spring容器管理，Spring容器关闭，就会调用Bean的销毁方法
当Bean为多例时，Bean不归Spring容器管理，Spring容器关闭，不会调用Bean的销毁方法

2

3. Kelas konfigurasi pendaftaran kacang (contoh tunggal)

4. Kelas ujian

public class Person {
    public Person(){
        System.out.println("Person 创建了...");
    }
    public void init(){
        System.out.println("Person 初始化了...");
    }
    public void destroy(){
        System.out.println("Person 被销毁了...");
    }
}

5 >

import com.dashu.bean.Person;
import org.springframework.context.annotation.*;
@Configuration
public class BeanConfig {
    @Bean(initMethod = "init",destroyMethod = "destroy")
    public Person person(){
        return new Person();
    }
}

6. Kelas konfigurasi pendaftaran kacang (berbilang kejadian)

import com.dashu.bean.Person;
import com.dashu.config.BeanConfig;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Main {
    public static void main(String[] args) {
        //加载配置类获取容器
        AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(BeanConfig.class);
        //获取Bean
        Person bean = annotationConfigApplicationContext.getBean(Person.class);
        //关闭容器
        annotationConfigApplicationContext.close();
    }
}

7. Keputusan ujian

3. Bean Melaksanakan antara muka InitializingBean, DisposableBean

import com.dashu.bean.Person;
import org.springframework.context.annotation.*;
@Configuration
public class BeanConfig {
    @Scope("prototype")
    @Bean(initMethod = "init",destroyMethod = "destroy")
    public Person person(){
        return new Person();
    }
}

1 Orang

2 kelas konfigurasi pendaftaran Bean

3

4 Melalui anotasi @PostConstruct dan @PreDestroy

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
public class Person implements InitializingBean, DisposableBean {
    public Person(){
        System.out.println("Person 创建了...");
    }
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("Person 初始化了...");
    }
    @Override
    public void destroy() throws Exception {
        System.out.println("Person 被销毁了...");
    }
}

1 Orang

import com.dashu.bean.Person;
import org.springframework.context.annotation.*;
@Configuration
public class BeanConfig {
    @Bean
    public Person person(){
        return new Person();
    }
}

hasil ujian

5 Gunakan antara muka BeanPostProcessor untuk melaksanakan kelas (post-processor)

@PostConstruct：标注在Bean的初始化方法上
@PreDestroy：标注在Bean的销毁方法上

1 Struktur projek

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
public class Person {
    public Person(){
        System.out.println("Person 创建了...");
    }
    @PostConstruct
    public void init(){
        System.out.println("Person 初始化了...");
    }
    @PreDestroy
    public void destroy(){
        System.out.println("Person 被销毁了...");
    }
}

2. Orang

3. Kelas konfigurasi pendaftaran kacang

4. Kelas pelaksanaan BeanPostProcessor

5 >

import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
@Component
public class Person {
    public Person(){
        System.out.println("Person 创建了...");
    }
    @PostConstruct
    public void init(){
        System.out.println("Person 初始化了...");
    }
    @PreDestroy
    public void destroy(){
        System.out.println("Person 被销毁了...");
    }
}

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