Spring集合 (List,Set,Map,Properties) 实例

下面例子向您展示Spring如何注入值到集合类型(List, Set, Map, and Properties)。 支持4个主要的集合类型：

• List – <list/>
• Set – <set/>
• Map – <map/>
• Properties – <props/>

Spring beans

一个Customer对象，有四个集合属性。

File:Customer.java

public class Customer {

	private List<Object> lists;
	private Set<Object> sets;
	private Map<Object,Object> maps;
	private Properties pros;
	
	public void setLists(List<Object> lists) {
		this.lists = lists;
	}
	public void setSets(Set<Object> sets) {
		this.sets = sets;
	}
	public void setMaps(Map<Object, Object> maps) {
		this.maps = maps;
	}
	public void setPros(Properties pros) {
		this.pros = pros;
	}
	@Override
	public String toString() {
		return "Customer [\n lists=" + lists + ",\n sets=" + sets + ",\n maps=" + maps + ",\n pros=" + pros + "\n]";
	}
}

File:Person.java

public class Person {

	private String name;
	private String address;
	private int age;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	@Override
	public String toString() {
		return "Person [name=" + name + ", address=" + address + ", age=" + age + "]";
	}
}

在bean配置文件中不同的代码片段用来声明集合。

1. List示例

<!-- java.util.List -->
		<property name="lists">
			<list>
				<value>1</value>
				<ref bean="PersonBean" />
				<bean class="com.ray.common.Person">
					<property name="name" value="Rain" />
					<property name="address" value="zhuhaiGongbei" />
					<property name="age" value="17" />
				</bean>
			</list>
		</property>

2. Set示例

<!-- java.util.Set -->
		<property name="sets">
			<set>
				<value>1</value>
				<ref bean="PersonBean" />
				<bean class="com.ray.common.Person">
					<property name="name" value="Rain" />
					<property name="address" value="zhuhaiGongbei" />
					<property name="age" value="17" />
				</bean>
			</set>
		</property>

3. Map示例

<!-- java.util.Map -->
		<property name="maps">
			<map>
				<entry key="Key 1" value="1" />
				<entry key="Key 2" value-ref="PersonBean" />
				<entry key="Key 3">
					<bean class="com.ray.common.Person">
						<property name="name" value="Rain" />
						<property name="address" value="zhuhaiGongbei" />
						<property name="age" value="17" />
					</bean>
				</entry>
			</map>
		</property>

4. Properties示例

<!-- java.util.Properties -->
		<property name="pros">
			<props>
				<prop key="admin">admin@ray.com</prop>
				<prop key="super">super@ray.com</prop>
			</props>
		</property>

Spring完整的 bean 配置文件:

<?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="CustomerBean" class="com.ray.common.Customer">

		<!-- java.util.List -->
		<property name="lists">
			<list>
				<value>1</value>
				<ref bean="PersonBean" />
				<bean class="com.ray.common.Person">
					<property name="name" value="Rain" />
					<property name="address" value="zhuhaiGongbei" />
					<property name="age" value="17" />
				</bean>
			</list>
		</property>

		<!-- java.util.Set -->
		<property name="sets">
			<set>
				<value>1</value>
				<ref bean="PersonBean" />
				<bean class="com.ray.common.Person">
					<property name="name" value="Rain" />
					<property name="address" value="zhuhaiGongbei" />
					<property name="age" value="17" />
				</bean>
			</set>
		</property>

		<!-- java.util.Map -->
		<property name="maps">
			<map>
				<entry key="Key 1" value="1" />
				<entry key="Key 2" value-ref="PersonBean" />
				<entry key="Key 3">
					<bean class="com.ray.common.Person">
						<property name="name" value="Rain" />
						<property name="address" value="zhuhaiGongbei" />
						<property name="age" value="17" />
					</bean>
				</entry>
			</map>
		</property>
		
		<!-- java.util.Properties -->
		<property name="pros">
			<props>
				<prop key="admin">admin@ray.com</prop>
				<prop key="super">super@ray.com</prop>
			</props>
		</property>
	</bean>

	<bean id="PersonBean" class="com.ray.common.Person">
		<property name="name" value="Ray" />
		<property name="address" value="zhuhai" />
		<property name="age" value="17" />
	</bean>
</beans>

执行程序

public class Test {

	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "beans2.xml" });
		Customer cust = (Customer) context.getBean("CustomerBean");
		System.out.println(cust);
	}
}

执行结果

Customer [
 lists=[1, Person [name=Ray, address=zhuhai, age=17], Person [name=Rain, address=zhuhaiGongbei, age=17]],
 sets=[1, Person [name=Ray, address=zhuhai, age=17], Person [name=Rain, address=zhuhaiGongbei, age=17]],
 maps={Key 1=1, Key 2=Person [name=Ray, address=zhuhai, age=17], Key 3=Person [name=Rain, address=zhuhaiGongbei, age=17]},
 pros={admin=admin@ray.com, super=super@ray.com}
]