Spring集合 (List,Set,Map,Properties) 實例
下面例子向您展示Spring如何注入值到集合類型(List, Set, Map, and Properties)。 支持4個主要的集合類型：
- List –
- Set –
- Map –
- Properties –
Spring beans
一個Customer對象，有四個集合屬性。
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
//...}
在bean配置文件中不同的代碼片段用來聲明集合。
1. List示例
2. Set示例
3. Map示例
4. Properties示例
Spring完整的 bean 配置文件。
<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">[email protected]</prop>
<prop key="support">[email protected]</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>執行程序
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);
}}
輸出
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=[email protected], support=[email protected]}]