Spring 基于XML的集合注入

Love The Way You Lie 2022-02-09 07:53 241阅读 0赞

## Spring 基于XML的集合注入 ##

现在如果想传递多个值，如 Java Collection 类型 List、Set、Map 和 Properties，应该怎么做呢。为了处理这种情况，Spring 提供了四种类型的集合的配置元素，如下所示：  
![在这里插入图片描述][20190501232649299.png]

*  配置

<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.xsd">
    
        
        <bean id="collDataId" class="com.cc.study.di.CollData" >
            <property name="arrayData">
                <array>
                    <value>A</value>
                    <value>B</value>
                    <value>C</value>
                    <value>D</value>
                    
                </array>
            </property>
    
            <property name="listData">
                <list>
                    <value>A</value>
                    <value>B</value>
                    <value>C</value>
                    <value>D</value>
                </list>
            </property>
    
            <property name="setData">
                <set>
                    <value>A</value>
                    <value>B</value>
                    <value>C</value>
                </set>
            </property>
    
            <property name="mapData">
                <map>
                    <entry key="A" value="AA"></entry>
                    
                    <entry>
                        <key><value>B</value></key>
                        <value>BB</value>
                    </entry>
                </map>
            </property>
    
            <property name="propsData">
                <props>
                    <prop key="A">AA</prop>
                    <prop key="B">BB</prop>
                    <prop key="C">CC</prop>
                </props>
            </property>
            
            <property name="str"><null/></property>
        </bean>
    
    </beans>

*  CollData

public class CollData {
    
        private String[] arrayData;
        private List<String> listData;
        private Set<String> setData;
        private Map<String,String> mapData;
        private Properties propsData;
        private String str = "123";
    
        public String getStr() {
            return str;
        }
    
        public void setStr(String str) {
            this.str = str;
        }
    
        public String[] getArrayData() {
            return arrayData;
        }
    
        public void setArrayData(String[] arrayData) {
            this.arrayData = arrayData;
        }
    
        public List<String> getListData() {
            return listData;
        }
    
        public void setListData(List<String> listData) {
            this.listData = listData;
        }
    
        public Set<String> getSetData() {
            return setData;
        }
    
        public void setSetData(Set<String> setData) {
            this.setData = setData;
        }
    
        public Map<String, String> getMapData() {
            return mapData;
        }
    
        public void setMapData(Map<String, String> mapData) {
            this.mapData = mapData;
        }
    
        public Properties getPropsData() {
            return propsData;
        }
    
        public void setPropsData(Properties propsData) {
            this.propsData = propsData;
        }
    }

*  测试

@Test
        public void demo12(){
            String xmlPath = "di7.xml";
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
            CollData c = applicationContext.getBean("collDataId",CollData.class);
            System.out.println(Arrays.asList(c.getArrayData()));
            System.out.println(c.getListData());
            System.out.println(c.getSetData());
            System.out.println(c.getMapData());
            System.out.println(c.getPropsData());
            System.out.println(c.getStr());
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nja2V2aW5jeWg_size_16_color_FFFFFF_t_70]

[20190501232649299.png]: /images/20220209/e857224f225a4add993a8cf00cc9c5e2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nja2V2aW5jeWg_size_16_color_FFFFFF_t_70]: /images/20220209/30bed3f20fd849a690a11825856adbd4.png