Spring初学笔记

最新推荐文章于 2025-12-17 18:09:55 发布

原创最新推荐文章于 2025-12-17 18:09:55 发布 · 115 阅读

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#Spring #Java #Bean #XML #junit

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[b]依赖注入：[/b]
1. 构造器注入
配置文件（放classpath根目录下）


   <?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-2.5.xsd">

        <!-- 用默认构造器方式 注入
	<bean id="personService"class="org.spring.imp.PersonServiceImp"/>-->

接口


   package org.spring.service;

   public interface PersonService {
	public void savePerson();
   }

imp实现类


    package org.spring.imp;

    import org.spring.service.PersonService;

    public class PersonServiceImp implements PersonService {

	public void savePerson() {
		System.out.println("执行了PersonSerciceImp.savePerson()方法...");
	}

   }

junit测试


   public class SpringTest {

	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
	}

	@Test public void InitSpringContext(){
		ApplicationContext ctx = new  ClassPathXmlApplicationContext("beans.xml");
		// 默认构造方法注入
		PersonService personService = (PersonServiceImp)ctx.getBean("personService");
		personService.savePerson();
	}

}

2.静态工厂方法方式
静态工厂方法（有statice关键字）


   package org.spring.unit;
   public class PersonServiceFactory {

	public static PersonService createPersonService(){
		return new PersonServiceImp();
	}
   }

bean配置


  <bean id="personServiceFactory" class="org.spring.unit.PersonServiceFactory"   factory-method="createPersonService"/>

3.工厂方法方式
工厂方法


   public PersonService createPersonService2(){
		return new PersonServiceImp();
	}

bean配置


   <bean id="personServiceFactory" class="org.spring.unit.PersonServiceFactory"/>
  		<bean id="personService3" factory-bean="personServiceFactory" factory-method="createPersonService2"/>