Spring中注入List，Set，Map,Properties-优快云博客

本文详细介绍了在Spring框架中如何进行List、Set、Map和Properties类型的依赖注入。通过配置XML文件，演示了各种集合类型的注入方式，并提供了具体的代码实现示例。

下面的例子展示了如何注入

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

Spring beans

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;

    //...
}

　　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.mkyong.common.Customer">

        <!-- java.util.List -->

        <property name="lists">

            <list>

                <value>1</value>

                <ref bean="PersonBean" />

                <bean class="com.mkyong.common.Person">

                    <property name="name" value="mkyongList" />

                    <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="com.mkyong.common.Person">

                    <property name="name" value="mkyongSet" />

                    <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="com.mkyong.common.Person">

                        <property name="name" value="mkyongMap" />

                        <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@nospam.com</prop>

                <prop key="support">support@nospam.com</prop>

            </props>

        </property>

    </bean>

    <bean id="PersonBean" class="com.mkyong.common.Person">

        <property name="name" value="mkyong1" />

        <property name="address" value="address 1" />

        <property name="age" value="28" />

    </bean>

</beans>

运行：

public class App
{

    public static void main( String[] args )

    {

        ApplicationContext context = new ClassPathXmlApplicationContext("SpringBeans.xml");

        Customer cust = (Customer)context.getBean("CustomerBean");

        System.out.println(cust);

    }
}

　　我们也可以使用ListFactoryBean。The ‘ListFactoryBean‘ class provides developer a way to create a concrete List collection class (ArrayList and LinkedList) in Spring’s bean configuration file.

<bean id="CustomerBean" class="com.mkyong.common.Customer">

        <property name="lists">

            <bean class="org.springframework.beans.factory.config.ListFactoryBean">

                <property name="targetListClass">

                    <value>java.util.ArrayList</value>

                </property>

                <property name="sourceList">

                    <list>

                        <value>1</value>

                        <value>2</value>

                        <value>3</value>

                    </list>

                </property>

            </bean>

        </property>

    </bean>

　　或者：加入：xmlns:util="http://www.springframework.org/schema/util"然后就可以：

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:util="http://www.springframework.org/schema/util"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

    http://www.springframework.org/schema/util

    http://www.springframework.org/schema/util/spring-util-2.5.xsd">

    <bean id="CustomerBean" class="com.mkyong.common.Customer">

        <property name="lists">

            <util:list list-class="java.util.ArrayList">

                <value>1</value>

                <value>2</value>

                <value>3</value>

            </util:list>

        </property>

    </bean>

</beans>

　　　　　　　　　SetFactoryBean　The ‘SetFactoryBean‘ class provides developer a way to create a concrete Set collection (HashSet and TreeSet) in Spring’s bean configuration file.

set和上面的一样：

<bean id="CustomerBean" class="com.mkyong.common.Customer">

        <property name="sets">

            <util:set set-class="java.util.HashSet">

                <value>1</value>

                <value>2</value>

                <value>3</value>

            </util:set>

        </property>

    </bean>

　　　　　　　　　MapFactoryBean　The ‘MapFactoryBean‘ class provides developer a way to create a concrete Map collection class (HashMap and TreeMap) in Spring’s bean configuration file.

map也一样：

<bean id="CustomerBean" class="com.mkyong.common.Customer">

        <property name="maps">

            <util:map map-class="java.util.HashMap">

                <entry key="Key1" value="1" />

                <entry key="Key2" value="2" />

                <entry key="Key3" value="3" />

            </util:map>

        </property>

    </bean>