Spring集合类型值注入-优快云博客

本文详细介绍了Spring3框架中四种集合类型的注入方式：List、Set、Map和Properties，并提供了具体的XML配置示例。

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Spring 3支持4种集合类型：

List – <list/>
Set – <set/>
Map – <map/>
Properties – <props/>

下面是一个Customer对象，带有四个集合属性。

package com.xuejava.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;

         //...
}

1、List示例

在bean配置文件中声明List集合。

         <property name="lists">
                   <list>
                            <value>1</value>
                            <ref bean="PersonBean" />
                            <bean class="cn.xuejava.common.Person">
                                     <property name="name" value="xuejavaList" />
                                     <property name="address" value="address" />
                                     <property name="age" value="28" />
                            </bean>
                   </list>
         </property>

2、 Set示例

在bean配置文件中声明Set集合。

         <property name="sets">
                   <set>
                            <value>1</value>
                            <ref bean="PersonBean" />
                            <bean class="cn.xuejava.common.Person">
                                     <property name="name" value="xuejavaSet" />
                                     <property name="address" value="address" />
                                     <property name="age" value="28" />
                            </bean>
                   </set>
         </property>

3、 Map示例

在bean配置文件中声明Map集合。

         <property name="maps">
                   <map>
                            <entry key="Key 1" value="1" />
                            <entry key="Key 2" value-ref="PersonBean" />
                            <entry key="Key 3">
                                     <bean class="cn.xuejava.common.Person">
                                               <property name="name" value="xuejavaMap" />
                                               <property name="address" value="address" />
                                               <property name="age" value="28" />
                                     </bean>
                            </entry>
                   </map>
         </property>

4、 Properties示例

在bean配置文件中声明Properties。

         <property name="pros">
                   <props>
                            <prop key="admin">admin@163.com</prop>
                            <prop key="support">support@163.com</prop>
                   </props>
         </property>

5、完整的Spring bean配置文件

完整的Spring-Customer.xml配置文件如下：

<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-3.0.xsd">

         <bean id="CustomerBean" class="cn.xuejava.common.Customer">

                   <!-- java.util.List -->
                   <property name="lists">
                            <list>
                                     <value>1</value>
                                     <ref bean="PersonBean" />
                                     <bean class="cn.xuejava.common.Person">
                                               <property name="name" value="xuejavaList" />
                                               <property name="address" value="address" />
                                              <property name="age" value="28" />
                                     </bean>
                            </list>
                   </property>

                   <!-- java.util.Set -->
                   <property name="sets">
                            <set>
                                     <value>1</value>
                                     <ref bean="PersonBean" />
                                     <bean class="cn.xuejava.common.Person">
                                               <property name="name" value="xuejavaSet" />
                                               <property name="address" value="address" />
                                               <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="cn.xuejava.common.Person">
                                                        <property name="name" value="xuejavaMap" />
                                                        <property name="address" value="address" />
                                                        <property name="age" value="28" />
                                               </bean>
                                     </entry>
                            </map>
                   </property>

                   <!-- java.util.Properties -->
                   <property name="pros">
                            <props>
                                     <prop key="admin">admin@163.com</prop>
                                     <prop key="support">support@163.com</prop>
                            </props>
                   </property>

         </bean>


         <bean id="PersonBean" class="cn.xuejava.common.Person">
                   <property name="name" value=" xuejava 1" />
                   <property name="address" value="address 1" />
                   <property name="age" value="28" />
         </bean>

</beans>

6、运行

编写测试程序，并运行：

package com.xuejava.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("Spring-Customer.xml");

        Customer cust = (Customer)context.getBean("CustomerBean");
        System.out.println(cust);
    }

}

7、输出结果

输出结果如下：

Customer [

lists=[
1,
Person [address=address 1, age=28, name=xuejava 1],
Person [address=address, age=28, name= xuejavaList]
],

maps={
key 1=1,
key 2=Person [address=address 1, age=28, name= xuejava 1],
key 3=Person [address=address, age=28, name= xuejavaMap]
},

pros={admin=admin@163.com, support=support@163.com},

sets=[
1,
Person [address=address 1, age=28, name= xuejava 1],
Person [address=address, age=28, name= xuejavaSet]]
]