本篇文章介绍基于XML注入类似于List/Map/Set等集合类型或自定义Object类型的注入方式<br />[https://gitee.com/gao_xi/spring-demo1/tree/type-di-demo/](https://gitee.com/gao_xi/spring-demo1/tree/type-di-demo/)

1.各种类型的注入方式

<?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="book" class="com.gao.Book">
        <property name="name" value="Java核心技术卷I"/>
        <!--数组-->
        <property name="array">
            <array>
                <value>Java</value>
                <value>编程四大名著</value>
            </array>
        </property>
        <!--列表-->
        <property name="list">
            <list>
                <value>1</value>
                <value>2</value>
            </list>
        </property>
        <!--map-->
        <property name="map">
            <map>
                <entry key="11" value="12"></entry>
                <entry key="12" value="12"></entry>
            </map>
        </property>
        <!--set-->
        <property name="set">
            <set>
                <value>11</value>
                <value>12</value>
            </set>
        </property>
        <!--AnyType-->
        <property name="author" ref="author"></property>
    </bean>
    <bean id="author" class="com.gao.Author">
        <property name="name" value="gaoxi"></property>
    </bean>
</beans>

2.内部bean形式注入其他Bean

    <bean id="book" class="com.gao.Book">
        <!--AnyType-->
        <property name="author">
            <bean id="author" class="com.gao.Author">
                <property name="name" value="gaoxi"></property>
            </bean>
        </property>
    </bean>

3.级联赋值

    <bean id="book" class="com.gao.Book">
        <!--AnyType-->
        <property name="author" ref="author"></property>
        <property name="author.name" value="James"/>
    </bean>
    <bean id="author" class="com.gao.Author">
        <property name="name" value="gaoxi"></property>
    </bean>

这种赋值方式的Book类需要提供对Author类的Getter方法

package com.gao;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
 * @author GaoXi
 * @date 2021/8/13 19:31
 */
public class Book {
    // ........
    private Author author;
    public void setAuthor(Author author) {
        this.author = author;
    }
    public Author getAuthor() {
        return author;
    }
    // ........
}

4.集合里面是自定义类类型

    <bean id="book" class="com.gao.Book">
       <property name="authorList">
           <list>
               <ref bean="author1"></ref>
               <ref bean="author2"></ref>
           </list>
       </property>
    </bean>
    <bean id="author1" class="com.gao.Author">
        <property name="name" value="gaoxi"></property>
    </bean>
    <bean id="author2" class="com.gao.Author">
        <property name="name" value="高溪"/>
    </bean>