在Spring中可以装配4种集合类型属性：List、set、Map和Properties。与这四种集合对应的标签是、、、。CollectionBean是一个包含上述4种集合类型的JavaBean，代码如下：

package chapter22;import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;public class CollectionBean {private List myList;private String myArray[];private Set mySet;private Map myMap;private Properties myProperties;public List getMyList() {return myList;}public void setMyList(List myList) {System.out.println("set List类型："+myList.getClass().getName());this.myList = myList;}public String[] getMyArray() {return myArray;}public void setMyArray(String[] myArray) {this.myArray = myArray;}public Set getMySet() {return mySet;}public void setMySet(Set mySet) {System.out.println("set Set类型："+mySet.getClass().getName());this.mySet = mySet;}public Map getMyMap() {return myMap;}public void setMyMap(Map myMap) {System.out.println("set Map类型："+myMap.getClass().getName());this.myMap = myMap;}public Properties getMyProperties() {return myProperties;}public void setMyProperties(Properties myProperties) {System.out.println("set Properties类型："+myProperties.getClass().getName());this.myProperties = myProperties;}
}

下面是装配上述4中集合类型属性的配置代码

xml version="1.0" encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"><bean id="helloservice" class="chapter22.HelloServiceImpl"><property name="greeting" value="greeting Xu Wei">property>bean><bean id="myBean" class="chapter22.MyBean"><property name="hello"><ref bean="helloservice" />property><property name="strName" value="Xu Wei">property>bean> <bean id="CollectionBean" class="chapter22.CollectionBean"> <property name="myList"> <list><value>abcdvalue> <idref bean="myBean">idref> list> property><property name="myMap"> <map> <entry> <key> <value>hellovalue>key> <value>1234value>entry> <entry key="abcd"> <ref bean="helloservice" />entry> <entry> <key> <ref bean="helloservice" >ref>key> <ref bean="myBean" >ref>entry>map>property> <property name="mySet"> <set> <value>testvalue> <ref bean="myBean">ref>set>property> <property name="myProperties"> <props><prop key="abcd">value1prop> <prop key="prop">myPropprop>props>property> <property name="myArray"> <list> <value>myArrayvalue> <idref bean="helloservice" >idref>list>property>bean> beans>

下面的TestCollectionContext.java代码使用ApplicationContext接口的getBean方法创建了CollectionBean对象，并访问了相关属性。

package chapter22;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;public class TestCollectionBean {public static void main(String args[]){ApplicationContext ctx=new FileSystemXmlApplicationContext("src//applicationContext.xml");
/*在创建ctx对象实例以后，applicationContext.xml配置中涉及到的Bean的set方法都被调用了。*单单执行ApplicationContext ctx=new FileSystemXmlApplicationContext("src//applicationContext.xml");*的输出结果是：*log4j:WARN No appenders could be found for logger (org.springframework.context.support.FileSystemXmlApplicationContext).*log4j:WARN Please initialize the log4j system properly.*setGreeting()方法被调用*setHello()方法被调用*setStrName()方法被调用*set List类型：java.util.ArrayList*set Map类型：java.util.LinkedHashMap*set Set类型：java.util.LinkedHashSet*set Properties类型：java.util.Properties*/    //创建CollectionBean对象cb。CollectionBean cb=(CollectionBean)ctx.getBean("CollectionBean");System.out.println("------测试List------");for(String s:cb.getMyList())System.out.println(s);System.out.println("------测试Array------");for(String s:cb.getMyArray())System.out.println(s);System.out.println("------测试Set------");for(Object obj:cb.getMySet())System.out.println(obj.getClass().getName());System.out.println("------测试Map------");//Map其实就是key-value的键值对。cb.getMyMap().get(key)是要找到key所对应的value。for(Object key:cb.getMyMap().keySet())System.out.println(key+"="+cb.getMyMap().get(key));System.out.println("------测试Properties------");for(Object key:cb.getMyProperties().keySet())System.out.println(key+"="+cb.getMyProperties().get(key));}
}

输出结果：

log4j:WARN No appenders could be found for logger (org.springframework.context.support.FileSystemXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
setGreeting()方法被调用
setHello()方法被调用
setStrName()方法被调用
set List类型：java.util.ArrayList
set Map类型：java.util.LinkedHashMap
set Set类型：java.util.LinkedHashSet
set Properties类型：java.util.Properties
------测试List------
abcd
myBean
------测试Array------
myArray
helloservice
------测试Set------
java.lang.String
chapter22.MyBean
------测试Map------
hello=1234
abcd=chapter22.HelloServiceImpl@e70e30
chapter22.HelloServiceImpl@e70e30=chapter22.MyBean@154864a
------测试Properties------
abcd=value1
prop=myProp