src\dayday\Person.java

package dayday; /**  * Created by I am master on 2016/11/28.  */ public class Person {
      private String name;     private int age;     private City city;     private Car car;     public void setName(String name){
          this.name=name;     }     public void setAge(int age){
          this.age=age;     }     public void setCity(City city){
          this.city=city;     }     public void setCar(Car car){
          this.car=car;     }    public void toprint(){
         System.out.println("["+"name="+name+" age="+age+" car"+car+" city"+city+"]");    } }

src\daydayCity.java

package dayday; /**  * Created by I am master on 2016/11/28.  */ public class City {
      private String livecity;     private String street;     public void setLivecity(String livecity) {
          this.livecity=livecity;     }     public void setStreet(String street{
          this.street=street;     }     public String getLivecity(){
          return livecity;     }     public String getStreet(){
          return street;     }     public String toString(){
          return "["+"city="+livecity+" street"+street +"]";     } }

src\dayday\Car.java

package dayday; /**  * Created by I am master on 2016/11/28.  */ public class Car {
      private String name;     public void setName(String name){
          this.name=name;     }     public String getName(){
          return name;     }     public String toString(){
          return "["+"carname="+name+"]";     } }

src\dayday\Main.java

package dayday; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /**  * Created by I am master on 2016/11/28.  */ public class Main {
      public static void main(String[] args){
          ApplicationContext ctx= new ClassPathXmlApplicationContext("beans.xml");         Person person1=ctx.getBean("person1",Person.class);         Person person2=ctx.getBean("person1",Person.class);         person1.toprint();         person2.toprint();     } }

src\beans.xml<?xml version="1.0" encoding="UTF-8"?>

            
             
             
             
             
             
      
     运行结果

[name=dayday age=18 car[carname=Audi] city[city=shaoxing streetxinchang]]

[name=dayday age=18 car[carname=Audi] city[city=shaoxing streetxinchang]]

 

装配机制

byName根据bean的名字和当前bean的setter风格的属性名进行自动匹配，若有匹配的，则进行自动装配，若没有匹配的，则不装配

比如bean中有setXXX()的方法，且在配置文件中，bean中id="XXX"则可进行自动装配，id="XXX1"就不可以装配

byType根据bean的类型和当前bean的属性进行自动装配，若IOC容器中有一个及以上的类型匹配的bean，则将抛出异常

在实际开发中很少用自动装配，因为代码不够一目了然，而且存在很多局限性，如不能两种装配方式同时进行，如果选择了自动了装配，就不能手动配置...