Spring中复杂类型的依赖注入

用于给List结构集合注入的标签：list、array、set
用于给Map结构集合注入的标签：map、props
结构相同标签可以互换。

示例：
pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.qublog</groupId>
    <artifactId>spring01_di</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>
    </dependencies>

</project>

AccountService接口：

package com.qublog.service;

//账户业务层接口
public interface AccountService {
    //模拟保存账户
    void saveAccount();
}

AccountServiceImpl3类：

package com.qublog.service.impl;

import com.qublog.service.AccountService;

import java.util.*;

//账户的业务层实现类
public class AccountServiceImpl3 implements AccountService {

    private String[] myStrs;
    private List<String> myList;
    private Set<String> mySet;
    private Map<String, String> myMap;
    private Properties myProps;

    public void setMyStrs(String[] myStrs) {
        this.myStrs = myStrs;
    }

    public void setMyList(List<String> myList) {
        this.myList = myList;
    }

    public void setMySet(Set<String> mySet) {
        this.mySet = mySet;
    }

    public void setMyMap(Map<String, String> myMap) {
        this.myMap = myMap;
    }

    public void setMyProps(Properties myProps) {
        this.myProps = myProps;
    }

    public void saveAccount() {
        System.out.println(Arrays.toString(myStrs));
        System.out.println(myList);
        System.out.println(mySet);
        System.out.println(myMap);
        System.out.println(myProps );
    }
}

bean.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">
    <!-- 把对象的创建交给spring来管理 -->
    <!-- 构造函数注入：
        使用的标签：constructor-arg
        标签出现的位置：bean标签的内部
        标签的属性
    -->
    <bean id="accountService" class="com.qublog.service.impl.AccountServiceImpl">
        <constructor-arg name="name" value="泰斯特"></constructor-arg>
        <constructor-arg name="age" value="18"></constructor-arg>
        <constructor-arg name="birthday" ref="now"></constructor-arg>
    </bean>

    <!-- 配置一个日期对象 -->
    <bean id="now" class="java.util.Date"></bean>

    <!-- 使用set方法注入
        涉及的标签property
        出现的位置bean标签的内部
    -->
    <bean id="accountService2" class="com.qublog.service.impl.AccountServiceImpl2">
        <property name="name" value="tz"></property>
        <property name="age" value="21"></property>
        <property name="birthday" ref="now"></property>
    </bean>

    <!-- 复杂类型的注入/集合类型注入 -->
    <bean id="accountService3" class="com.qublog.service.impl.AccountServiceImpl3">
        <property name="myStrs">
            <array>
                <value>AAA</value>
                <value>BBB</value>
                <value>CCC</value>
            </array>
        </property>

        <property name="myList">
            <list>
                <value>AAA</value>
                <value>BBB</value>
                <value>CCC</value>
            </list>
        </property>

        <property name="mySet">
            <set>
                <value>AAA</value>
                <value>BBB</value>
                <value>CCC</value>
            </set>
        </property>

        <property name="myMap">
            <map>
                <entry key="testA" value="AAA"></entry>
                <entry key="testB">
                    <value>BBB</value>
                </entry>
            </map>
        </property>

        <property name="myProps">
            <props>
                <prop key="testC">CCC</prop>
                <prop key="testD">DDD</prop>
            </props>
        </property>
    </bean>
</beans>

Client类：

package com.qublog.ui;

import com.qublog.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

//模拟一个表现层，用于调用业务层
public class Client {
    public static void main(String[] args) {
        //获取核心容器对象
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //根据id获取bean对象，下面两种方式都可以
        AccountService as = (AccountService)ac.getBean("accountService3");
        as.saveAccount();
    }
}

打印输出：