Spring集合 (List,Set,Map,Properties) 实例

下面例子向您展示Spring如何注入值到集合类型(List, Set, Map, and Properties)。 支持4个主要的集合类型：

List – <list/>

Set – <set/>

Map – <map/>

Properties – <props/>

Spring beans

一个Customer对象，有四个集合属性。

package com.yiibai.common;

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;

//...
}

在bean配置文件中不同的代码片段用来声明集合。

1. List示例

<property name="lists">
<list>
<value>1</value>
<ref bean="PersonBean" />
<bean class="com.yiibai.common.Person">
<property name="name" value="yiibaiList" />
<property name="address" value="Hainan" />
<property name="age" value="28" />
</bean>
</list>
</property>

2. Set示例

<property name="sets">
<set>
<value>1</value>
<ref bean="PersonBean" />
<bean class="com.yiibai.common.Person">
<property name="name" value="yiibaiSet" />
<property name="address" value="Hainan" />
<property name="age" value="28" />
</bean>
</set>
</property>

3. Map示例

<property name="maps">
<map>
<entry key="Key 1" value="1" />
<entry key="Key 2" value-ref="PersonBean" />
<entry key="Key 3">
<bean class="com.yiibai.common.Person">
<property name="name" value="yiibaiMap" />
<property name="address" value="Hainan" />
<property name="age" value="28" />
</bean>
</entry>
</map>
</property>

4. Properties示例

<property name="pros">
<props>
<prop key="admin">admin@yiibai.com</prop>
<prop key="support">support@yiibai.com</prop>
</props>
</property>

Spring完整的 bean 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.yiibai.common.Customer">

<!-- java.util.List -->
<property name="lists">
<list>
<value>1</value>
<ref bean="PersonBean" />
<bean class="com.yiibai.common.Person">
<property name="name" value="yiibaiList" />
<property name="address" value="Hainan Haikou" />
<property name="age" value="28" />
</bean>
</list>
</property>

<!-- java.util.Set -->
<property name="sets">
<set>
<value>1</value>
<ref bean="PersonBean" />
<bean class="com.yiibai.common.Person">
<property name="name" value="yiibaiSet" />
<property name="address" value="Hainan Haikou" />
<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.yiibai.common.Person">
<property name="name" value="yiibaiMap" />
<property name="address" value="Hainan Haikou" />
<property name="age" value="28" />
</bean>
</entry>
</map>
</property>

<!-- java.util.Properties -->
<property name="pros">
<props>
<prop key="admin">admin@yiibai.com</prop>
<prop key="support">support@yiibai.com</prop>
</props>
</property>

</bean>

<bean id="PersonBean" class="com.yiibai.common.Person">
<property name="name" value="yiibai1" />
<property name="address" value="Hainan Haikou 1" />
<property name="age" value="28" />
</bean>

</beans>

执行程序

package com.yiibai.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

Customer [lists=[1, com.yiibai.common.Person@4e4ee70b, com.yiibai.common.Person@1e1867d2], sets=[1, com.yiibai.common.Person@4e4ee70b, com.yiibai.common.Person@52f644b4], maps={Key 1=1, Key 2=com.yiibai.common.Person@4e4ee70b, Key 3=com.yiibai.common.Person@54481b6d}, pros={admin=admin@yiibai.com, support=support@yiibai.com}]

下载代码 – http://pan.baidu.com/s/1c0T3i5i