spring框架原理

1.spring框架原理（spring框架什么被加载，spring中配置的bean怎么被创建，bean与bean之间的关系怎么样被维护）
当ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");执行的时候， 
我们的spring容器对象被创建，同时applicationContext.xml中配置bean就会被创建（），基于java的
反射机制
内存（applicationContext对象引用）[结构类型HashMap]
id       对象
userService(ox123)        UserSer[name, byeService]


2.UserService us =(UserService) ac.getBean("userService");




java反射机制的深入了解(dom4j+java反射机制)
userService =Class.forName("com.service.UserService");
userService.setName("zhujingao");
bybService=Class.forName("com.service.BybService");
bybService.setName("xiaoming");
userService.setByeService("bybService");
applicationContext.put("userService",userService);

applicationContext.put("bybService",bybService);

package com.service;


import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class Test {


public static  void main (String [] args){

//用传统方法调用Userservice的sayhello方法
/*Userservice userservice =new Userservice();
userservice.setName("朱敬傲");
userservice.sayHello();
*/
//现在使用spring来完成上面的任务
//1.现在得到spring的applicationContext对象(容器对象)
ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
Userservice us =(Userservice) ac.getBean("application");
us.sayHello();



}
}

package com.service;


public class Userservice {


private String name;
private int age;
private String sex;

public String getName() {
return name;
}


public void setName(String name) {
this.name = name;
}


public int getAge() {
return age;
}


public void setAge(int age) {
this.age = age;
}


public String getSex() {
return sex;
}


public void setSex(String sex) {
this.sex = sex;
}


public void sayHello(){

System.out.println("sayHello");
}



}