Spring初学笔记

依赖注入：
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"/>