Spring的HelloWorld

①创建Java工程

②添加Spring包到CLASSPATH中，主要的jar包包括

commons-logging-1.1.3.jar （Spring的jar依赖该包）
spring-beans-4.0.0.RELEASE.jar
spring-context-4.0.0.RELEASE.jar
spring-core-4.0.0.RELEASE.jar
spring-expression-4.0.0.RELEASE.jar

③创建bean类Book（eclipse中ctrl+o查看类的成员）

package com.dcx.spring.bean;

public class Book {
	private Integer id;
	private String name;
	private String author;
	private double price;

	public Book() {
		super();
	}

	public Book(Integer id, String name, String author, double price) {
		super();
		this.id = id;
		this.name = name;
		this.author = author;
		this.price = price;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	@Override
	public String toString() {
		return "Book [id=" + id + ", name=" + name + ", author=" + author
				+ ", price=" + price + "]";
	}

}

　　④为Book创建Spring的bean配置文件，该文件放置在项目的src文件夹下，项目结构如下

beans.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	<bean id="book" class="com.dcx.spring.bean.Book">
		<property name="id" value="1" />
		<property name="name" value="活着" />
		<property name="author" value="余华" />
		<property name="price" value="15.8" />
	</bean>

</beans>

　⑤建立测试类

package junit.test;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.dcx.spring.bean.Book;

public class TestIOC {
	private ApplicationContext ioc;
	
	@Before
	public void setUp(){
		//通过加载XML文件来创建ioc容器
		ioc = new ClassPathXmlApplicationContext("beans.xml");
	}
	
	@After
	public void tearDown(){
　　　　　　　　　　//关闭ioc
		AbstractApplicationContext acc = (AbstractApplicationContext)ioc;
		acc.close();
	}
	
	@Test
	public void test01() {
		//获取bean对象
		Book book = (Book)ioc.getBean("book");
		System.out.println(book);
	}

}

　⑥查看测试结果，成功获取bean对象