Spring基于XML的DI-集合属性注入

原创

渭城朝雨浥轻尘 2022-06-24 17:53:53 博主文章分类：java框架 ©著作权

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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">
        <!-- 为数组赋值 -->
        <property name="schools">
            <array>
                <ref bean="mySchool"/>
                <ref bean="yourSchool"/>
            </array>
        </property>

        <!-- 为List赋值 -->
        <property name="myList">
            <list>
                <value>张三</value>
                <value>李四</value>
            </list>
        </property>

        <!-- 为Set赋值 -->
        <property name="mySet">
            <set>
                <value>北京</value>
                <value>西京</value>
                <value>南京</value>
            </set>
        </property>

        <!-- 为Map赋值 -->
        <property name="myMap">
            <map>
                <entry key="QQ" value="1326922252"></entry>
                <entry key="weChat" value="a1326922252"></entry>
            </map>
        </property>

        <!-- 为Properties赋值 -->
        <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

<!-- 为List赋值 -->
        <property name="myList" value="张三,李四">
        </property>

        <!-- 为Set赋值 -->
        <property name="mySet" value="北京,西京,南京">
        </property>