SPRINGIOC container-Create object _j2ee-spring

SPRINGIOC container, is the spring core content. Functions: Creating objects to handle dependencies of objects

IOC container Creation object:
There are several ways to create an object:
1) calling the parameterless constructor
2) with Parameter Builder
3) Factory Create object
Factory class, static method Creation object
Factory class, non-static method creation Object

The spring configuration file is configured to create the object

<?xml version= "1.0" encoding= "UTF-8"?> <beans "xmlns=" xmlns: Xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns:p= "http://www.springframework.org/schema/p" xmlns:context= "Http://www.springframework.org/schema/context" xsi:schemalocation= "Http://www.springframework.org/schema/bea NS Http://www.springframework.org/schema/beans/spring-beans.xsd Http://www.springframework.org/schema/cont Ext http://www.springframework.org/schema/context/spring-context.xsd "> <!--############## #对象创建 ########## #####--> <!--1. The default parameterless constructor <bean id= "user1" class= cn.itcast.b_create_obj. User "></bean>--> <!--2. With parameter builder--> <bean id= "User2" class=. User "> <constructor-arg index=" 0 "type=" int "value=" M "></constructor-arg> <constructor-arg Index = "1" type= "java.lang.String" value= "Jack" ></constructor-arg> </beaN> <!--defines a string, the value is "Jack"; string s = new String ("Jack")--> <bean id= "str" class= "java.lang.String" > <constructor-arg value= "Jacks" ;</constructor-arg> </bean> <bean id= "User3" class= "Cn.itcast.b_create_obj". User "> <constructor-arg index=" 0 "type=" int "value=" M "></constructor-arg> <constructor-arg Index = "1" type= "java.lang.String" ref= "str" ></constructor-arg> </bean> <!--factory Class Create Object--> <!--# work Factory class, instance method--> <!--first create factory--> <bean id= "Factory class=" cn.itcast.b_create_obj. Objectfactory "></bean> <!--creating the user object, factory instance method--> <bean id=" User4 "factory-bean=" Factory "   Factory-method= "getinstance" ></bean> <!--# factory class: Static method--> <!--class Specifies the factory type Factory-method Must be inside the factory "static method"--> <bean id= "user" class= cn.itcast.b_create_obj.     Objectfactory "factory-method=" getstaticinstance "></bean> </beans>

Entity class User.java

public class User {

	private int id;
	private String name;
	
	
	
	Public User () {
		super ();
		SYSTEM.OUT.PRINTLN ("------User object creation" without parameter Builder "------");
	
	
	public User (int ID, String name) {
		System.out.println ("-----User object creation" with parameter Builder "--------");
		This.id = ID;
		this.name = name;


	public int getId () {return
		ID;
	}
	public void setId (int id) {
		this.id = ID;
	}
	Public String GetName () {return
		name;
	}
	public void SetName (String name) {
		this.name = name;
	}
	
	
	@Override public
	String toString () {return
		"User [id=" + ID + ", name=" + name + "]";
	}


	public void Init_user () {
		System.out.println ("Initialize after object creation");
	}
	public void Destroy_user () {
		System.out.println ("IOC container destroy, User Object Recycle!");
	}
	

Test code

Create IOC container object
		applicationcontext ac = new Classpathxmlapplicationcontext ("Cn/itcast/b_create_obj/bean.xml");
		Gets the object
		user user = (user) Ac.getbean ("user") in the container;
		
		SYSTEM.OUT.PRINTLN (user);

Demo factory Create classes for objects

Factory, create object public
class Objectfactory {

	//instance method creation object public
	User getinstance () {return
		new User (100, " Factory: Invoke instance method ");
	}
	
	static method Creation Object public
	static User getstaticinstance () {return
		new User (101, Factory: Calling static method);
	}