五.依赖注入

1. 注入方式

分别为

构造器注入  （上一个随笔用的）

set注入 【重点】

依赖注入：set注入！

依赖：bean对象的创建依赖于容器

注入：bean对象的所有属性 由容器来注入

2.环境搭建

stuent类和address类

package com.why;

import java.util.*;

/**
 * @program: Spring_Study
 * @description:
 * @author: @why
 * @create: 2020-08-11 17:40
 **/
public class Student {
    //这2个赋值简单 就是引用类型了 你给啥我用啥了
private  String name;
private Address address;
private  String[] books;
private List<String> hobbys;
private Map<String,String> card;
private Set<String> games;
private Properties info;
private  String wife;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        System.out.println("name的set");
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
        System.out.println("address的set");
    }

    public String[] getBooks() {
        return books;
    }

    public void setBooks(String[] books) {
        this.books = books;
        System.out.println("book的set");
    }

    public List<String> getHobbys() {
        return hobbys;
    }

    public void setHobbys(List<String> hobbys) {
        this.hobbys = hobbys;
        System.out.println("hobby的set");
    }

    public Map<String, String> getCard() {
        return card;
    }

    public void setCard(Map<String, String> card) {
        this.card = card;
        System.out.println("card的set");
    }

    public Set<String> getGames() {
        return games;
    }

    public void setGames(Set<String> games) {
        this.games = games;
        System.out.println("game的set");
    }

    public Properties getInfo() {
        return info;
    }

    public void setInfo(Properties info) {
        this.info = info;
        System.out.println("info的set");
    }

    public String getWife() {
        return wife;
    }

    public void setWife(String wife) {
        this.wife = wife;
        System.out.println("wife的set");
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", address=" + address +
                ", books=" + Arrays.toString(books) +
                ", hobbys=" + hobbys +
                ", card=" + card +
                ", games=" + games +
                ", info=" + info +
                ", wife='" + wife + '\'' +
                '}';
    }
}

 

 

package com.why;

/**
 * @program: Spring_Study
 * @description:
 * @author: @why
 * @create: 2020-08-11 17:41
 **/
public class Address {
    private  String address;
   public Address(){
    }
    public Address(String address) {
        this.address = address;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
        System.out.println("地址定位");
    }

    @Override
    public String toString() {
        return "Address{" +
                "address='" + address + '\'' +
                '}';
    }

}

 

3.xml的配置

<?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">
    <!--配置类：address-->
    <bean class="com.why.Address" id="address">
        <property name="address" value="中国"/>
    </bean>


    <bean class="com.why.Student" id="student">
        <!--    基本属性赋值-->
        <property name="name" value="why"/>
        <!--        赋空值-->
        <property name="wife">
            <null/>
        </property>
        <!--    可以ref引用上面的类型 也可以自己建立一个-->
        <property name="address">
            <bean class="com.why.Address" name="address2">
                <property name="address" value="歪比歪比"/>
            </bean>
            <!--    set注入-->
        </property>
        <property name="games">
            <set>
                <value>芜湖</value>
            </set>
        </property>
        <!--    map注入-->
        <property name="card">
            <map>
                <entry key="1" value="起飞"></entry>
            </map>
        </property>
        <!--list注入-->
        <property name="hobbys">
            <list>
                <value>吃</value>
                <value>喝</value>
            </list>
        </property>
        <!--数组注入-->
        <property name="books">
            <array>
                <value>哈哈</value>
                <value>哈哈哈啊</value>
            </array>
        </property>
<!--        Properties类型注入 -->
<property name="info">
    <props>
        <prop key="url">localhost:8080</prop>
    </props>
</property>

    </bean>


</beans>

4.使用和输出