IOC容器-Bean管理XML方式集合的注入

Posted 2022-12-03

1、IOC操作Bean管理（xml注入集合属性）

• 1、注入数组类型属性
• 2、注入list集合类型属性
• 3、注入map集合类型属性
• 4、注入set集合类型属性

类型	方式
数组	<array> <value>C语言</value> </array>
list	<list> <value>张三</value> </list>
map	<map> <entry key="JAVA" value="java"/></map>
set	<set><value>mysql</value> </set>

2、定义数组、list、map、set 类型属性，生成对应 set 方法

2.1 创建类

package com.zyz.spring5;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * @author Lenovo
 * @version 1.0
 * @data 2022/9/25 21:28
 */
public class TestStu 
    /**
     * 1、数组类型属性
     */
    private String [] courses;

    /**
     * 2、list集合类型属性
     */
    private List<String> list;

    /**
     * 3、map集合类型属性
     */
    private Map<String,String> maps;

    /**
     * 4、set集合类型属性
     */
    private Set<String> sets;

    public void setCourses(String[] courses) 
        this.courses = courses;
    

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

    public void setMaps(Map<String, String> maps) 
        this.maps = maps;
    

    public void setSets(Set<String> sets) 
        this.sets = sets;
    

    @Override
    public String toString() 
        return "TestStu\\n" +
                "courses=" + Arrays.toString(courses) +
                ",\\n list=" + list +
                ",\\n maps=" + maps +
                ",\\n sets=" + sets +
                ;
    

<hr>

2.2、编写xml配置文件

<?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="stu" class="com.zyz.spring5.TestStu">
        <!--1、数组类型属性注入-->
        <property name="courses">
            <array>
                <value>C语言</value>
                <value>Go语言</value>
                <value>Java语言</value>
            </array>
        </property>

        <!--2、list类型属性注入-->
        <property name="list">
            <list>
                <value>张三</value>
                <value>李四</value>
                <value>麻子</value>
            </list>
        </property>

        <!--3、map类型属性注入-->
        <property name="maps">
            <map>
                <entry key="JAVA" value="java"/>
                <entry key="MYSQL" value="mysql"/>
                <entry key="php" value="php"/>
            </map>
        </property>

        <!--4、set类型属性注入-->
        <property name="sets">
            <set>
                <value>MySQL</value>
                <value>SQLServer</value>
            </set>
        </property>

    </bean>

</beans>

<hr>

2.3、测试

package com.zyz.spring5.testdemo;

import com.zyz.spring5.TestStu;
import com.zyz.spring5.dao.Employee;
import com.zyz.spring5.entity.Person;
import com.zyz.spring5.service.CatService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author Lenovo
 * @version 1.0
 * @data 2022/9/22 22:25
 */
public class SpringTest5 

    @Test
    public void testSpring()
        ApplicationContext context = new ClassPathXmlApplicationContext("bean3.xml");
        TestStu testStu = context.getBean("stu",TestStu.class);
        System.out.println(testStu);

    

<hr>

2.4、测试结果

3、在集合里面设置对象类型值

==主要是ref==

3.1 创建一个用户类

package com.zyz.spring5.entity;

import lombok.Data;

/**
 * @author Lenovo
 * @version 1.0
 * @data 2022/9/22 22:23
 */
public class Person 
    private String address;
    private String name;

    public void setAddress(String address)
        this.address = address;
    

    public void setName(String name)
        this.name = name;
    

    @Override
    public String toString() 
        return "Person" +
                "address=" + address + \\ +
                ", pname=" + name + \\ +
                ;
    

3.2 用户对象作为集合中的值

    /**
     *5、集合中设置对象属性值
     */
    private List<Person> personList;

    public void setPersonList(List<Person> personList)
        this.personList = personList;
    

3.3 xml配置文件

        <!--5、集合中设置对象属性值-->
        <property name="personList">
            <list >
                <ref bean="person1"/>
                <ref bean="person2"/>
            </list>
        </property>

        
    </bean>

    <bean id="person1" class="com.zyz.spring5.entity.Person">
        <property name="address" value="河南周口"/>
        <property name="name" value="张三"/>
    </bean>

    <bean id="person2" class="com.zyz.spring5.entity.Person">
        <property name="address" value="河南郑州"/>
        <property name="name" value="李四"/>
    </bean>

4、集合注入部分提取出来

4.1 在 spring 配置文件中引入名称空间 util

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">

    <util:list id="bookList">
        <value>高等数学</value>
        <value>大学英语</value>
        <value>大学政治</value>
    </util:list>

    <bean id="testStu" class="com.zyz.spring5.TestStu">
        <property name="list" ref="bookList"></property>
    </bean>

</beans>

<hr>

4.2 使用 util 标签完成 list 集合注入提取

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation=
   "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">

    <util:list id="bookList">
        <value>高等数学</value>
        <value>大学英语</value>
        <value>大学政治</value>
    </util:list>

    <util:list id="personList">
        <ref bean="person1"/>
        <ref bean="person2"/>
    </util:list>

    <bean id="person1" class="com.zyz.spring5.entity.Person">
        <property name="address" value="河南周口"/>
        <property name="name" value="张三"/>
    </bean>

    <bean id="person2" class="com.zyz.spring5.entity.Person">
        <property name="address" value="河南郑州"/>
        <property name="name" value="李四"/>
    </bean>

    <bean id="testStu" class="com.zyz.spring5.TestStu">
        <property name="list" ref="bookList"></property>
        <property name="personList" ref="personList"/>
     </bean>

</beans>

<hr>

4.3 测试结果