Spring 学习笔记 -beans 的自动扫描与装配和管理

XML配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    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
        http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="org.example"/>

</beans>

调用xml文件代码

		ApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml");
		PersonService personService=(PersonService)ctx.getBean("personService");
		personService.save();

personservicebean方法

package cn.cast.service.impl;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import cn.cast.service.PersonService;
import cn.cast.dao.PersonDao;

@Service
public class PersonServiceBean implements PersonService {
@Resource
	private PersonDao personDaoBean;

	public void show() {
		personDaoBean.show();
	}

	public void setPersonDaoBean(PersonDao personDaoBean) {
		this.personDaoBean = personDaoBean;
	}

	public PersonDao getPersonDaoBean() {
		return personDaoBean;
	}

}

persondaobean方法

package cn.cast.dao.impl;

import org.springframework.stereotype.Repository;

import cn.cast.dao.PersonDao;

@Repository 
public class PersonDaoBean implements PersonDao   
{   
    public void show()   
    {   
        System.out.println("执行PersonDaoBean中的add()方法");   
    }   
}  

测试方法

package cn.cast.main;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.cast.service.PersonService;

public class Testmain {
	public static void main(String args[]){
		ApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml");
		PersonService personService=(PersonService)ctx.getBean("personServiceBean");
		personService.show();
		
	}
}

--定义Bean的注解

 

@Controller

@Controller("Bean的名称")

定义控制层Bean,如Action

 

@Service          

@Service("Bean的名称")

定义业务层Bean

 

@Repository   

@Repository("Bean的名称")

定义DAO层Bean

 

@Component  

定义Bean, 不好归类时使用.

 

--定义Bean的作用域和生命过程

@Scope("prototype")

值有:singleton,prototype,session,request,session,globalSession

 

@PostConstruct 

相当于init-method,使用在方法上，当Bean初始化时执行。

 

@PreDestroy 

相当于destory-method，使用在方法上，当Bean销毁时执行。