Spring入门_IOC控制反转.docx

====================Demo==========================publicclass PersonService {private String name;privateintage;publicvoid setAge(int age) {this.age = age;}publicvoid info() {System.out.println(姓名: + name+ 年龄:+age);}publicvoid setName(String name) {this.name = name;}}=====================Config========================== = = = = beanname=personclass=com.dao.PersonServicepropertyname=namevalue=杨飞/propertypropertyname=agevalue=12/property/bean= = = = = = = = = = = = = = = = = = = = = Test= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =ApplicationContext content = newClassPathXmlApplicationContext(applicationContext.xml);PersonService ps = content.getBean(person, PersonService.class);ps.info();姓名:杨飞年龄:12= = = = = = = = = = = = = = = = = = = = = End= = = = = = = = = = = = = = = = = = = = = = = = = = = = = 上面两行代码并不是直接创建Person实例，而是通过Spring容器获取Person实例的，这正式Spring容器的作用，Spring容器不仅可以创建Person实例，而且该Person的name属性和age属性有了属性值。Spring容器根据配置文件信息，负责创建Person实例，并为Person实例设置属性值-----------这种由Spring容器设置属性的方式被称为控制反转（IOC）控制反转/依赖注入，依赖注入是目前最优秀的解耦方式，依赖注入让Spring的Bean以配置文件组织在一起，而不是以硬编码的方式耦合在一起。依赖注入通常有两种方式：设置注入：IOC容器使用属性Setter方法来注入被依赖的实例构造注入：IOC容器使用构造器来注入被依赖的实例= = = = = = = = = = = = = = = = = = = = Demo Dao= = = = = = = = = = = == = = = = = = = = = = == =publicinterface Person {// 定义了一个使用斧子的方法publicvoid useAxe();}publicinterface Axe {//有一个坎的方法public String chop();}= = = = = = = = = = = = = = = = = = = = Dao Impl= = = = = = = = = = = = = = = = = = = = = = = = =publicclassStoneAxeimplements Axe {public String chop() {return石斧砍柴好慢;}}publicclass Chinese implementsPerson {// 人使用斧子,那么必须有一个斧子private Axe axe;publicvoid setAxe(Axe axe) {this.axe = axe;}publicvoiduseAxe() {System.out.println(axe.chop());}}到现在为止Chinese还不知道和那个Axe实例耦合，Spring当然也不知道!!Spring需要使用XMl配置文件来指定实例之间的依赖关系。= = = = = = = = = = = = = = = = = = = = =Config= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =beanid=chineseclass=com.dao.impl.Chinesepropertyname=axeref=stoneAxe/property/beanbeanid=stoneAxeclass=com.dao.impl.Ston