Spring中集合类型的装配

通过<list/>、<set/>、<map/>及<props/>元素可以定义和设置与Java Collection类型对应List、Set、Map及Properties的值。下面通过一个简单例子说明一下：

 

CollectionService接口

package org.spring.service;

import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

public interface CollectionService {
	public Set<String> getSets();

	public List<String> getLists();

	public Properties getProperties();

	public Map<String, String> getMaps();
	
}

 

CollectionService的实现类CollectionServiceBean

 

package org.spring.service.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.spring.service.CollectionService;

public class CollectionServiceBean implements CollectionService {
	private Set<String> sets = new HashSet<String>();
	private List<String> lists = new ArrayList<String>();
	private Properties properties = new Properties();
	private Map<String, String> maps = new HashMap<String, String>();

	public Map<String, String> getMaps() {
		return maps;
	}

	public void setMaps(Map<String, String> maps) {
		this.maps = maps;
	}

	public Properties getProperties() {
		return properties;
	}

	public void setProperties(Properties properties) {
		this.properties = properties;
	}

	public List<String> getLists() {
		return lists;
	}

	public void setLists(List<String> lists) {
		this.lists = lists;
	}

	public Set<String> getSets() {
		return sets;
	}

	public void setSets(Set<String> sets) {
		this.sets = sets;
	}
}

 

spring.xml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-2.5.xsd">

	<bean id="collectionServiceBean" class="org.spring.service.impl.CollectionServiceBean">
		<property name="sets">
			<set>
				<value>sets:First</value>
				<value>sets:Second</value>
				<value>sets:Third</value>
			</set>
		</property>

		<property name="lists">
			<list>
				<value>lists:First</value>
				<value>lists:Second</value>
				<value>lists:Third</value>
			</list>
		</property>

		<property name="properties">
			<props>
				<prop key="key1">value1</prop>
				<prop key="key2">value2</prop>
				<prop key="key3">value3</prop>
			</props>
		</property>

		<property name="maps">
			<map>
				<entry key="key-1" value="value-1"></entry>
				<entry key="key-2" value="value-2"></entry>
				<entry key="key-3" value="value-3"></entry>
			</map>
		</property>
	</bean>

</beans>  

 

测试类

package org.spring.junit;

import org.junit.Test;
import org.spring.service.CollectionService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringCollectionTest {
	@Test
	public void testCollection() {
		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(
				"spring.xml");

		CollectionService collectionService = (CollectionService) ctx
				.getBean("collectionServiceBean");

		System.out.println("============sets============");
		for (String value : collectionService.getSets()) {
			System.out.println(value);
		}

		System.out.println("============lists============");
		for (String value : collectionService.getLists()) {
			System.out.println(value);
		}

		System.out.println("============properties============");
		for (Object key : collectionService.getProperties().keySet()) {
			System.out.println(key
					+ " = "
					+ collectionService.getProperties().getProperty(
							(String) key));
		}

		System.out.println("============maps============");
		for (Object key : collectionService.getMaps().keySet()) {
			System.out.println(key + " = "
					+ collectionService.getMaps().get(key));
		}
	}
}

 

控制台输出结果：