Spring中注入List，Set，Map,Properties

下面的例子展示了如何注入

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

Spring beans

import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
 
public class Customer 
{
	private List<Object> lists;
	private Set<Object> sets;
	private Map<Object, Object> maps;
	private Properties pros;
 
	//...
}

　　配置文件：

<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-2.5.xsd">
 
	<bean id="CustomerBean" class="com.mkyong.common.Customer">
 
		<!-- java.util.List -->
		<property name="lists">
			<list>
				<value>1</value>
				<ref bean="PersonBean" />
				<bean class="com.mkyong.common.Person">
					<property name="name" value="mkyongList" />
					<property name="address" value="address" />
					<property name="age" value="28" />
				</bean>
			</list>
		</property>
 
		<!-- java.util.Set -->
		<property name="sets">
			<set>
				<value>1</value>
				<ref bean="PersonBean" />
				<bean class="com.mkyong.common.Person">
					<property name="name" value="mkyongSet" />
					<property name="address" value="address" />
					<property name="age" value="28" />
				</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.mkyong.common.Person">
						<property name="name" value="mkyongMap" />
						<property name="address" value="address" />
						<property name="age" value="28" />
					</bean>
				</entry>
			</map>
		</property>
 
		<!-- java.util.Properties -->
		<property name="pros">
			<props>
				<prop key="admin">admin@nospam.com</prop>
				<prop key="support">support@nospam.com</prop>
			</props>
		</property>
 
	</bean>
 
	<bean id="PersonBean" class="com.mkyong.common.Person">
		<property name="name" value="mkyong1" />
		<property name="address" value="address 1" />
		<property name="age" value="28" />
	</bean>
 
</beans>

运行：

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

　　我们也可以使用ListFactoryBean。The ‘ListFactoryBean‘ class provides developer a way to create a concrete List collection class (ArrayList and LinkedList) in Spring’s bean configuration file.

<bean id="CustomerBean" class="com.mkyong.common.Customer">
		<property name="lists">
			<bean class="org.springframework.beans.factory.config.ListFactoryBean">
				<property name="targetListClass">
					<value>java.util.ArrayList</value>
				</property>
				<property name="sourceList">
					<list>
						<value>1</value>
						<value>2</value>
						<value>3</value>
					</list>
				</property>
			</bean>
		</property>
	</bean>

　　或者：加入：xmlns:util="http://www.springframework.org/schema/util"然后就可以：

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
	http://www.springframework.org/schema/util
	http://www.springframework.org/schema/util/spring-util-2.5.xsd">
 
	<bean id="CustomerBean" class="com.mkyong.common.Customer">
		<property name="lists">
			<util:list list-class="java.util.ArrayList">
				<value>1</value>
				<value>2</value>
				<value>3</value>
			</util:list>
		</property>
	</bean>
 
</beans>

　　　　　　　　　SetFactoryBean　The ‘SetFactoryBean‘ class provides developer a way to create a concrete Set collection (HashSet and TreeSet) in Spring’s bean configuration file.

set和上面的一样：

<bean id="CustomerBean" class="com.mkyong.common.Customer">
		<property name="sets">
			<util:set set-class="java.util.HashSet">
				<value>1</value>
				<value>2</value>
				<value>3</value>
			</util:set>
		</property>
	</bean>

　　　　　　　　　MapFactoryBean　The ‘MapFactoryBean‘ class provides developer a way to create a concrete Map collection class (HashMap and TreeMap) in Spring’s bean configuration file.

map也一样：

<bean id="CustomerBean" class="com.mkyong.common.Customer">
		<property name="maps">
			<util:map map-class="java.util.HashMap">
				<entry key="Key1" value="1" />
				<entry key="Key2" value="2" />
				<entry key="Key3" value="3" />
			</util:map>
		</property>
	</bean>