bean的后置处理器

implements BeanPostProcessor

Spring当中的后置处理器是Spring体用的一个扩展点，开发者只要去实现，Spring当中的BeanPostProcessor接口，那么就能插手SpringBean实例化的一个过程(在实例化之前和实例化之后)

首相创造一个person类

public class Person {

	private Integer id;
	
	private String sex;
	
	private String name;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Person() {
	}
	
	@Override
	public String toString() {
		return " Person [id=" + id + ", sex=" + sex + ", name=" + name + "]";
	}

	
}

创建后置处理器

public class AfterHandler implements BeanPostProcessor {

	@Override
	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
		Person person=(Person) bean;
		if(person.getSex().equals("男")) {
			person.setName("张杰");
		}else {
			person.setName("谢辣");
		}
		return bean;
	}

	@Override
	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
		// 就算不使用也要放回bean
		return bean;
	}
	
}

写xml文件

		
		
	
	//把下面的bean放在xml文档 就是对该文档的任何bean操作
	
	
    

测试

public class Test {

	public static void main(String[] args) {
		
		ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("life.xml");
		Person person = ac.getBean("person", Person.class);
		System.out.println(person);
		ac.close();
		
	}
	
}

就可以打印id=1001 sex=男 name=张杰