集合属性List，Set，

一：List

1.在spring中可以通过一组内置的XML标签（列如List，Set）

2.配置java.util.List类型的属性，需要知道List标签，在标签里包含一些元素，这些标签可以通过<value>指定简单的常亮值，通过

<ref>指定对其他Bean的引用，通过<bean>指定内置的Bean的定义，通过<null>指定空元素，甚至内嵌集合。

3.数组的定义和List一样都使用<List>标签

4.配置java.util.Set需要使用Set标签，定义元素的方法和List一样。

二：例子

1.创建一个Person类

package com.collection.dhx;

import java.util.List;

import com.dhx.Car;

public class Person {
	private String name;
	private int age;
	private List<Car> cars;
	public Person() {
		super();
	}
	public Person(String name, int age, List<Car> cars) {
		super();
		this.name = name;
		this.age = age;
		this.cars = cars;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public List<Car> getCars() {
		return cars;
	}
	public void setCars(List<Car> cars) {
		this.cars = cars;
	}
	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + ", cars=" + cars + "]";
	}
}

 2.创建一个Car类

package com.dhx;

public class Car {
	private String brand;
	private String corp;
	private double price;
	private int    maxSpeed;
	
	public Car(String brand, String corp, int maxSpeed) {
		super();
		this.brand = brand;
		this.corp = corp;
		this.maxSpeed = maxSpeed;
	}
	public Car(String brand, String corp, double price) {
		super();
		this.brand = brand;
		this.corp = corp;
		this.price = price;
	}
	public Car() {
		super();
	}
	public String getBrand() {
		return brand;
	}
	public void setBrand(String brand) {
		this.brand = brand;
	}
	public String getCorp() {
		return corp;
	}
	public void setCorp(String corp) {
		this.corp = corp;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public int getMaxSpeed() {
		return maxSpeed;
	}
	public void setMaxSpeed(int maxSpeed) {
		this.maxSpeed = maxSpeed;
	}
	@Override
	public String toString() {
		return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price + ", maxSpeed=" + maxSpeed + "]";
	}
}

3.在applicationContext.xml中配置

<!-- 集合属性 -->
	<bean id="person3" class="com.collection.dhx.Person">
		<property name="name" value="wangzi"></property>
		<property name="age" value="24"></property>
		<property name="cars">
		    <list>
				<ref bean="car"/>			
				<null></null>
				<bean id="car" class="com.dhx.Car">
					<property name="brand" value="heilong"></property>
					<property name="corp" value="yunnan"></property>
					<property name="maxSpeed" value="1234"></property>
				</bean>	
			</list>
		</property>
	</bean>
	

4.在Mian类中打印

	        //创建spring容器对象，applicationContext是IOC容器，实际上也是一个接口
		//ClassPathXmlApplicationContext:是ApplicationContext的接口实现类，是在类的路径下实现该类
		ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
                Person p=(Person) ctx.getBean("person3");
		System.out.println(p);

5.List和Set用法相同，这里就不介绍了