1、引入依赖
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
2、创建类Person
public class Person {
private String name;
private Integer age;
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 Person(String name, Integer age) {
super();
this.name = name;
this.age = age;
}
public Person() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + "]";
}
}
3、创建配置文件beans.xml
<?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="person" class="com.atguigu.bean.Person">
<property name="age" value="18"></property>
<property name="name" value="zhangsan"></property>
</bean>
</beans>
4、创建测试类
public class MainTest {
@SuppressWarnings("resource")
public static void main(String[] args) {
//根据配置文件获取applicationContext
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
//根据bean的名称获取组件
Person bean = (Person) applicationContext.getBean("person");
System.out.println(bean);
}
}
5、用配置类代替配置文件
//配置类就相当于配置文件
@Configuration //告诉Spring这是一个配置类
public class MainConfig {
//给容器中注册一个Bean;类型为返回值的类型,id默认是用方法名作为id。也可以在括号内指定id
@Bean("person")
public Person person01(){
return new Person("lisi", 20);
}
}
6、修改测试类
public class MainTest {
@SuppressWarnings("resource")
public static void main(String[] args) {
//根据配置类获取applicationContext
ApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
//根据bean的类型获取组件
Person bean = applicationContext.getBean(Person.class);
System.out.println(bean);
//根据bean的类型获取组件名称
String[] namesForType = applicationContext.getBeanNamesForType(Person.class);
for (String name : namesForType) {
System.out.println(name);
}
}
}