Spring-介绍和搭建

Spring-介绍

一、三层架构中spring位置

二、spring一站式框架

        spring框架属于容器性质，容器中装什么对象就有什么功能，所以是一站式。它不仅不排斥其他框架，还能帮其他框架管理对象。（aop支持，ioc思想，spring jdbc，aop事务，junit测试支持等）

spring搭建

一、导包

1、4个spring包

2、日志包

com.springsource.org.apache.logging-1.1.1.jar

com.springsource.org.apache.log4j-1.2.15.jar        可选

二、创建一个对象

public class User {
	
	public User() {
		System.out.println("User对象空参构造方法!!!!");
	}
	private String name;
	private Integer age;
	private Car car;
	
	public User(String name, Car car) {
		System.out.println("User(String name, Car car)!!");
		this.name = name;
		this.car = car;
	}
	
	public User(Car car,String name) {
		System.out.println("User(Car car,String name)!!");
		this.name = name;
		this.car = car;
	}
	
	public User(Integer name, Car car) {
		System.out.println("User(Integer name, Car car)!!");
		this.name = name+"";
		this.car = car;
	}
	
	public Car getCar() {
		return car;
	}
	public void setCar(Car car) {
		this.car = car;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	
	public void init(){
		System.out.println("我是初始化方法!");
	}
	public void destory(){
		System.out.println("我是销毁方法!");
	}
	@Override
	public String toString() {
		return "User [name=" + name + ", age=" + age + ", car=" + car + "]";
	}
	
}

三、书写配置注册对象到容器

1、位置任意(建议放到src下)，配置文件名任意(建议applicationContext.xml)

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2、导入约束

<?xml version="1.0" encoding="UTF-8"?>
<beans xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd " xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<!-- 将User对象交给spring容器管理 -->
<bean class="cn.itcast.bean.User" name="user"/></beans>

四、代码测试

public class Demo {
	@Test
	public void fun(){
		//1 创建容器对象
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		/*//2 向容器"要"user对象
		User u = (User) ac.getBean("user");
		//3 打印user对象
		System.out.println(u);*/
	}
}