Spring学习七：Spring如何装配各种集合类型的属性

1、修改PresonServiceImpl 类，代码如下：

package com.learn.service.impl;

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

import com.learn.service.PresonService;

/**
 * 业务层
 * @author Administrator
 *
 */
public class PresonServiceImpl implements PresonService {
	
	private Set<String> sets;
	private List<String> list = 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> getList() {
		return list;
	}

	public void setList(List<String> list) {
		this.list = list;
	}

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

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

}

 

有关于 Properties 这个类，可以查看 ：

http://www.cnblogs.com/panjun-Donet/archive/2009/07/17/1525597.html

2、修对应的 PresonService 接口也做下修改，代码如下：

package com.learn.service;

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

public interface PresonService {

	/**
	 * 为了能在单元测试通过接口访问集合，我们在接口中定义get方法
	 */
	public Set<String> getSets();
	public List<String> getList();
	public Properties getProperties();
	public Map<String, String> getMaps();
}

 

通过接口访问集合，我们在接口中定义get方法。

3、XML 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.xsd"> <bean id="personService" class="com.learn.service.impl.PresonServiceImpl"> <property name="sets"> <set> <value>第一个set</value> <value>第二个set</value> <value>第三个set</value> </set> </property>

<!-- 这样也可给list 集合注入值，为什么？ -->

<!-- <property name="list"> <set> <value>第一个list</value> <value>第二个list</value> <value>第三个list</value> </set> </property> --> <property name="list"> <list> <value>第一个list</value> <value>第二个list</value> <value>第三个list</value> </list> </property> <property name="properties"> <props> <prop key="key1">properties1</prop> <prop key="key2">properties2</prop> <prop key="key3">properties3</prop> </props> </property> <property name="maps"> <map> <entry key="key1" value="map1"></entry> <entry key="key2" value="map2"></entry> <entry key="key3" value="map3"></entry> </map> </property> </bean> </beans>

4、单元测试，代码如下：

package junit.test;

import static org.junit.Assert.*;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.learn.service.PresonService;

public class TestSpring {

	@Test
	public void initContainerSpring() {
		//实例化spring容器 (使用类构造器实例化)
		AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("com//learn//spring//learn1.xml");
		PresonService personService = (PresonService)ctx.getBean("personService");
		
		for(String set : personService.getSets()){
			System.out.println(set);
		}
		System.out.println("===============");
		for(String list : personService.getList()){
			System.out.println(list);
		}
		System.out.println("===============");
		for(Object key : personService.getProperties().keySet()){
			System.out.println(key +"==="+ personService.getProperties().getProperty((String)key));
		}
		System.out.println("===============");
		for(String key : personService.getMaps().keySet()){
			System.out.println(key +"==="+ personService.getMaps().get(key));
		}
	
	}

}

 

5、如何给集合类型的属性注入活值，而不是写死的？