Java学习 --- @Configuration注解

一、@Configuration 与@Bean注解

@Configuration //这个类就是配置类相当于配置文件public class MyConfig {    @Bean    public User user(){        return new User("老王",25);    }    @Bean("pet") //相当于组件    public Pet pet(){        return new Pet("小白",1);    }}

 二、加载的组件相当于单实例

@SpringBootApplicationpublic class MyApplicataion {    public static void main(String[] args) {        ConfigurableApplicationContext run = SpringApplication.run(MyApplicataion.class, args);        String[] names = run.getBeanDefinitionNames();        for (String name: names) {            System.out.println(name);        }        Pet pet1 = run.getBean("pet", Pet.class);        Pet pet2 = run.getBean("pet", Pet.class);        System.out.println("pet1 与 pet2:"+ (pet1 == pet2));    } }

 三、配置类本身是组件

@SpringBootApplicationpublic class MyApplicataion {    public static void main(String[] args) {        ConfigurableApplicationContext run = SpringApplication.run(MyApplicataion.class, args);        String[] names = run.getBeanDefinitionNames();        for (String name: names) {            System.out.println(name);        }        MyConfig bean = run.getBean(MyConfig.class);        System.out.println(bean);    }

四、@Configuration(proxyBeanMethods = true)

@Configuration(proxyBeanMethods = true) //这个类就是配置类相当于配置文件public class MyConfig {    @Bean    public User user(){        return new User("老王",25);    }    @Bean("pet") //相当于组件    public Pet pet(){        return new Pet("小白",1);    }}

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原文链接：https://blog.csdn.net/qq_46093575/article/details/123719491

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本文作者：独苏
本文链接：https://www.cnblogs.com/dusucyy/p/16600279.html
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