集合注入

有多个集合，我们可以通过配置文件来赋值

package com.itheima.dao.impl;

import com.itheima.dao.BookDao;

import java.util.*;

/**
 * @Author: GenGen
 * @Description: 6Ge
 * @DateTime: 2022/10/3 16:09
 **/
public class BookDaoImpl implements BookDao {
    private  int[] array;
    private List<String> list;
    private Set<String> set;
    private Map<String,String> map;
    private Properties properties;

    public void setArray(int[] array) {
        this.array = array;
    }

    public void setList(List<String> list) {
        this.list = list;
    }

    public void setSet(Set<String> set) {
        this.set = set;
    }

    public void setMap(Map<String, String> map) {
        this.map = map;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public void save() {
        System.out.println("book dao save ...");

    }

    @Override
    public String toString() {
        return "BookDaoImpl{" +
                "array=" + Arrays.toString(array) +
                ", list=" + list +
                ", set=" + set +
                ", map=" + map +
                ", properties=" + properties +
                '}';
    }
}

applicationContext1.xml配置

1、arrayList 用<array>
2、list 用<list>
3、set 用<set>
4、map 用
<map>
<entry key="" value=""></entry>
</map>
5、properties 用
<props>
<prop key="">a</prop>
</props>

 <bean id="bookDao" class="com.itheima.dao.impl.BookDaoImpl ">
        <property name="array">
            <array>
                <value>100</value>
                <value>200</value>
                <value>300</value>
            </array>
        </property>
        <property name="list">
            <list>
                <value>a</value>
                <value>b</value>
                <value>c</value>
            </list>
        </property>
        <property name="set">
            <set>
                <value>a</value>
                <value>b</value>
                <value>c</value>
                <value>c</value>
            </set>
        </property>
        <property name="map">
            <map>
                <entry key="1" value="a"></entry>
                <entry key="2" value="b"></entry>
                <entry key="3" value="c"></entry>
            </map>
        </property>
        <property name="properties">
            <props>
                <prop key="1">a</prop>
                <prop key="2">b</prop>
                <prop key="3">c</prop>
            </props>
        </property>
    </bean>
    <bean id="bookService" class="com.itheima.service.impl.BookServiceImpl"/>