Spring框架学习之第5节

• request
• session
• global-session

三个在web开发中才有意义

如果配置成prototype有点类似于request

如果配置成singleton有点类似于web开发中的global-session

• 三种获取ApplicationContext对象引用的方法

1、ClassPathXmlApplicationContext:从类路径中加载

2、FileSystemXmlApplicationContext:从文件系统加载

3、XmlWebApplicationContext:从web系统中加载

项目结构：

beans.xml

<?xml version="1.0" encoding="utf-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:aop="http://www.springframework.org/schema/aop"
		xmlns:tx="http://www.springframework.org/schema/tx"
		xsi:schemaLocation="
			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
			http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

<bean id="student" scope="prototype" class="com.litao.ioc.Student">
<property name="name" value="小猪" />
</bean>
</beans>

Student.java

package com.litao.ioc;

public class Student {

	private String name;
	//Java对象都有一个默认无参构造函数
	public Student(){
		System.out.println("对象被创建");
	}

	public String getName() {
		return name;
	}

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

}

App1.java

package com.litao.ioc;

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

public class App1 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//通过类路径来获取
		ApplicationContext ac = new ClassPathXmlApplicationContext("com/litao/ioc/beans.xml");
		//通过文件路径来获取,通过相对路径或绝对路径
		//ApplicationContext ac = new FileSystemXmlApplicationContext("beans.xml");
		//当tomcat启动的时候会去加载
		//ApplicationContext ac = new 3.XmlWebApplicationContext("");
		Student s1 = (Student)ac.getBean("student");
		Student s2 = (Student)ac.getBean("student");
		System.out.println(s1+" "+s2);
		//配置成prototype,如果不使用则不给你创建对象，每次会产生全新的对象，对象的内存地址不一样
		//配置singleton,如果不使用则会给你创建一个，不管使用多少次都是同一个对象，内存地址一样

	}

}