10、spring的bean基础（2）-优快云博客

本文链接：https://blog.youkuaiyun.com/AustinBoris/article/details/55804593

本文详细介绍如何在Spring框架中使用XML配置文件将List、Set、Map和Properties等集合类型的对象注入到Bean的属性中。通过实例演示了每种集合类型的配置方式。

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10、spring bean基础（2）

在本文中，主要介绍在spring中将集合类型注入到bean的属性中，主要有以下四种集合类型。

List
Set
Map
Properties

假设项目中有一个bean

public class HelloWorld{

    private List<Object> list;
    private Set<Object> set;
    private Map<Object, Object> map;
    private Properties pro;

    //setter and getter methods
    //toString methods

}

List

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

Set

    <property name="set">
        <set>
            <value>1</value>
            <ref bean="Person" />
            <bean class="com.main.Person">
                <property name="name" value="yiibaiList" />
                <property name="address" value="Hainan" />
                <property name="age" value="28" />
            </bean>
        </set>
    </property>

Map

    <property name="map">
        <map>
            <value>1</value>
            <ref bean="Person" />
            <bean class="com.main.Person">
                <property name="name" value="yiibaiList" />
                <property name="address" value="Hainan" />
                <property name="age" value="28" />
            </bean>
        </map>
    </property>

Properties

    <property name="pros">
        <props>
            <prop key="key1">one</prop>
            <prop key="key2">two</prop>
        </props>
    </property>

完整的bean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-2.5.xsd">

    <bean id="HelloWorld" class="com.main.HelloWorld">

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

        <!-- java.util.Set -->
        <property name="set">
            <set>
                <value>1</value>
                <ref bean="Person" />
                <bean class="com.main.Person">
                    <property name="name" value="yiibaiList" />
                    <property name="address" value="Hainan" />
                    <property name="age" value="28" />
                </bean>
            </set>
        </property>

        <!-- java.util.Map -->
        <property name="map">
            <map>
                <value>1</value>
                <ref bean="Person" />
                <bean class="com.main.Person">
                    <property name="name" value="yiibaiList" />
                    <property name="address" value="Hainan" />
                    <property name="age" value="28" />
                </bean>
            </map>
        </property>

        <!-- java.util.Properties -->
        <property name="pros">
            <props>
                <prop key="key1">one</prop>
                <prop key="key2">two</prop>
            </props>
        </property>

    </bean>

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

</beans>