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(){<br>　　　　　　　　　　//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);
    }
 
}