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 ‘[b]ListFactoryBean‘ class provides developer a way to create a concrete List collection class (ArrayList and LinkedList) in Spring’s bean configuration file.[/b]

<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>

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

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>

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

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>