Spring 系列之 Bean 注解用法介绍

今天给大家介绍一下Spring中Bean注解的系列用法,后续的文章给大家介绍Sping其他注解用法，希望对大家日常工作能有所帮助!

1、解用首先创建一个maven项目引入spring依赖

org.springframework spring-context 5.3.9

2、法介新建一个person.java 实体类

package com.spring.bean;

public class Person {

private String name;

private Integer age;

private String address;

public Person(String name,系列 Integer age, String address) {

this.name = name;

this.age = age;

this.address = address;

}

public Person() {

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

@Override

public String toString() {

return "Person{ " +

"name=" + name + \ +

", age=" + age + \ +

", address=" + address + \ +

};

}

}

3、新建配置类 TestBeanConfig.java

package com.spring.config;

import com.spring.bean.Person;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

public class TestBeanConfig {

/*@Bean作用是解用注册一个Bean，站群服务器类型为返回值的法介类型，默认是系列使用方法名作为id，可以自己定义

* value 可以自定义id，解用默认和方法名一致

* */

@Bean(value = "person1")

public Person person() {

return new Person("小王",法介 35, "北京");

}

}

4、resources 创建配置文件

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.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

</beans>

5、云服务器系列新建测试类TestBean.java 具体展示注解方式和配置方式的解用示例

package com.spring.test;

import com.spring.bean.Person;

import com.spring.config.TestBeanConfig;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBean {

public static void main(String[] args) {

//配置文件方式

ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("person.xml");

Person bean = (Person) applicationContext.getBean("person");

System.out.println("配置方式:");

System.out.println(bean);

// 注解方式 AnnotationConfigApplicationContext 注解的方式获取spring容器

AnnotationConfigApplicationContext annotationContext = new AnnotationConfigApplicationContext(TestBeanConfig.class);

Person annotationPerson = (Person) annotationContext.getBean("person1");

System.out.println("注解方式:");

System.out.println(annotationPerson);

// 用来获取Spring容器中指定类型的所有JavaBean的名称

String[] beanNamesForType = annotationContext.getBeanNamesForType(Person.class);

for (String item : beanNamesForType) {

System.out.println(item);

}

}

}

6、运行效果：

法介

法介