package com.h3.common;

import java.util.set;

public class customer 
{
	private set sets;
	//...
}

<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.h3.common.customer">
		<property name="sets">
			<bean class="org.springframework.beans.factory.config.setfactorybean">
				<property name="targetsetclass">
					<value>java.util.hashset</value>
				</property>
				<property name="sourceset">
					<list>
						<value>one</value>
						<value>2</value>
						<value>three</value>
					</list>
				</property>
			</bean>
		</property>
	</bean>

</beans>

<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.h3.common.customer">
		<property name="sets">
			<util:set set-class="java.util.hashset">
				<value>one</value>
				<value>2</value>
				<value>three</value>
			</util:set>
		</property>
	</bean>

</beans>

caused by: org.xml.sax.saxparseexception: 
	the prefix "util" for element "util:set" is not bound.

执行结果

package com.h3.common;

import org.springframework.context.applicationcontext;
import org.springframework.context.support.classpathxmlapplicationcontext;

public class app 
{
    public static void main( string[] args )
    {
    	applicationcontext context = new classpathxmlapplicationcontext("applicationcontext.xml");

    	customer cust = (customer)context.getbean("customerbean");
    	system.out.println(cust);
    	
    }
}

输出结果：

customer [sets=[2, one, three]] type=[class java.util.hashset]