Spring基于XML的DI-集合属性注入

迷南。 2023-10-17 12:05 39阅读 0赞

## 基于XML的DI-集合属性注入 ##

### bean(TheOne.java) ###

package com.hk.spring.di05;
    
    import java.util.Arrays;
    import java.util.List;
    import java.util.Map;
    import java.util.Properties;
    import java.util.Set;
    
    public class TheOne {
        
    
        private School[] schools;
        private List<String> myList;
        private Set<String> mySet;
        private Map<String,Object> myMap;
        private Properties myProperties;
    
        public void setSchools(School[] schools) {
            this.schools = schools;
        }
        public void setMyList(List<String> myList) {
            this.myList = myList;
        }
        public void setMySet(Set<String> mySet) {
            this.mySet = mySet;
        }
        public void setMyMap(Map<String, Object> myMap) {
            this.myMap = myMap;
        }
        public void setMyProperties(Properties myProperties) {
            this.myProperties = myProperties;
        }
        @Override
        public String toString() {
            return "TheOne [schools=" + Arrays.toString(schools) + ", myList="
                    + myList + ", mySet=" + mySet + ", myMap=" + myMap
                    + ", myProperties=" + myProperties + "]";
        }
    
    }

### 配置（applicationContext.xml） ###

<?xml version="1.0" encoding="UTF-8"?>
    <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="mySchool" class="com.hk.spring.di05.School">
            <property name="schloolName" value="红林小学"/>
        </bean>
        <bean id="yourSchool" class="com.hk.spring.di05.School">
            <property name="schloolName" value="东源小学"/>
        </bean>
    
        <bean id="theOne" class="com.hk.spring.di05.TheOne">
            
            <property name="schools">
                <array>
                    <ref bean="mySchool"/>
                    <ref bean="yourSchool"/>
                </array>
            </property>
    
            
            <property name="myList">
                <list>
                    <value>张三</value>
                    <value>李四</value>
                </list>
            </property>
    
            
            <property name="mySet">
                <set>
                    <value>北京</value>
                    <value>西京</value>
                    <value>南京</value>
                </set>
            </property>
    
            
            <property name="myMap">
                <map>
                    <entry key="QQ" value="1326922252"></entry>
                    <entry key="weChat" value="a1326922252"></entry>
                </map>
            </property>
    
            
            <property name="myProperties">
                <props>
                    <prop key="账号">123456</prop>
                    <prop key="密码">789012</prop>
                </props>
            </property>
        </bean>
    </beans>

### 测试类（MyTest.java） ###

package com.hk.spring.di05;
    
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Mytest {
        @Test
        public void test1(){
            String resource = "com/hk/spring/di05/applicationContext.xml";
            ApplicationContext ac = new ClassPathXmlApplicationContext(resource);
            TheOne theOne = (TheOne) ac.getBean("theOne");
            System.out.println(theOne);
        }
    }

### 结果 ###

TheOne [schools=[School [schloolName=红林小学], School [schloolName=东源小学]], myList=[张三, 李四], mySet=[北京, 西京, 南京], myMap={QQ=1326922252, weChat=a1326922252}, myProperties={账号=123456, 密码=789012}]

### 简便写法 ###

<property name="myList" value="张三,李四">
            </property>
    
            
            <property name="mySet" value="北京,西京,南京">
            </property>

#### 仅限于字符串，复杂的结构不适用 ####