Spring learning notes, spring learning notes

Spring learning notes, spring learning notes

XML configuration

<?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>

Call the xml file code

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

Personservicebean Method

package cn.cast.service.impl;import javax.annotation.Resource;import org.springframework.stereotype.Service;import cn.cast.service.PersonService;import cn.cast.dao.PersonDao;@Servicepublic class PersonServiceBean implements PersonService {@Resourceprivate PersonDao personDaoBean;public void show() {personDaoBean.show();}public void setPersonDaoBean(PersonDao personDaoBean) {this.personDaoBean = personDaoBean;}public PersonDao getPersonDaoBean() {return personDaoBean;}}

Persondaobean Method

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 ("execute the add () method in the PersonDaoBean ");}}

Test Method

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();}}

-- Define Bean annotations

 

@ Controller

@ Controller ("Bean name ")

Define control layer beans, such as Action

 

@ Service

@ Service ("Bean name ")

Define service layer Bean

 

@ Repository

@ Repository ("Bean name ")

Define DAO layer Bean

 

@ Component

Bean definition, which is not suitable for classification.

 

-- Define Bean scope and lifecycle

@ Scope ("prototype ")

Values: singleton, prototype, session, request, session, globalSession

 

@ PostConstruct

It is equivalent to init-method. It is used in the method and executed during Bean initialization.

 

@ PreDestroy

This is equivalent to destory-method. It is used in the method and executed when the Bean is destroyed.