Spring注解@Configuration与@Bean注册组件的使用详解

package com.jektong.spring;
public class Person {
	private String name;
	private int age;
	public Person() {
		super();
	}
	public Person(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return \"Person [name=\" + name + \", age=\" + age + \"]\";
	}
}

	4.0.0
	com.jektong
	maven01
	0.0.1-SNAPSHOT
	maven01
	maven01
	
		
		
			org.springframework
			spring-context
			4.3.12.RELEASE
		 
	

package com.jektong.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class PersonTest {
	public static void main(String[] args) {
        // 加载配置文件，此文件放在类路径下。
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(\"bean.xml\");
        // 获取bean.xml文件中注入的Person对象，并输出。
		Person bean = (Person) applicationContext.getBean(\"person\");
		System.out.println(bean);		
	}
}

package com.jektong.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.jektong.spring.Person;
@Configuration // 告诉spring这是配置类相当于配置文件bean.xml
public class PersonConfig {
    // 这是注入到spring容器的对象ID
    // 括号内指定唯一ID，不指定则是默认以方法名为唯一ID，相当于：标签中的ID值。
	@Bean(\"person01\") 
	public Person person() {
		return new Person(\"李四\",21);
	}
}

package com.jektong.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import com.jektong.config.PersonConfig;
public class PersonTest {
	public static void main(String[] args) {	
		ApplicationContext ac = new AnnotationConfigApplicationContext(PersonConfig.class);
		Person bean = ac.getBean(Person.class);
		System.out.println(bean);
        // 查看BEAN的id
		String[] beanDefinitionNames = ac.getBeanNamesForType(Person.class);
		for (int i = 0; i < beanDefinitionNames.length; i++) {
			System.out.println(\"beanid为：\"+ beanDefinitionNames[i]);
		}
	}
}