Spring 依赖注入的几种方式

一、实体类-Student

package com.alipay.sofa.XX;

import java.util.*;

public class Student {
    private String name;
    private String[] books;
    private List<String> hobby;
    private Map<String,String> card;
    private Set<String> games;
    private Properties infos;
　　private Addresss addresss;


    public String getName() {
        return name;
    }

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

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

    public void setBooks(String[] books) {
        this.books = books;
    }

    public List<String> getHobby() {
        return hobby;
    }

    public void setHobby(List<String> hobby) {
        this.hobby = hobby;
    }

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

    public void setCard(Map<String, String> card) {
        this.card = card;
    }

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

    public void setGames(Set<String> games) {
        this.games = games;
    }

    public Properties getInfos() {
        return infos;
    }

    public void setInfos(Properties infos) {
        this.infos = infos;
    }

　　public Addresss getAddresss() {
    　　return addresss;
　　}

　　public void setAddresss(Addresss addresss) {
   　　 this.addresss = addresss;
　　}

　　@Override 

　　public String toString() { 
　　return "Student{" + 
　　　　"name='" + name + '\'' +　
　　　  ", addresss=" + addresss.toString() +
　　   ", books=" + Arrays.toString(books) + 
　　　　", hobby=" + hobby + 
　　　　", card=" + card + 
　　　　", games=" + games + 
　　　　", infos=" + infos + '}'; 

　　} 

}

 

二、实体类-Addresss

package com.alipay.sofa.XX;

public class Addresss {
    private String addresss;
    
    public String getAddresss() {
        return addresss;
    }

    public void setAddresss(String addresss) {
        this.addresss = addresss;
    }

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

 

三、Bean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="adresss" class="com.alipay.sofa.XX.Addresss">
　　　　<property name="addresss" value="西安" />
　　</bean>

　　<bean id="student" class="com.alipay.sofa.XX.Student">

<!--            普通注入，用value-->
    　　　　 <property name="name" value="设置的变量的值" />

<!--    Bean注入，用ref-->
            <property name="addresss" ref="addresss" />

<!--    数组注入-->
            <property name="books">
                <array>
                    <value>红楼梦</value>
                    <value>西游记</value>
                    <value>三国演义</value>
                    <value>水浒传</value>
                </array>
            </property>

<!--    list注入-->
            <property name="hobby">
                <list>
                    <value>听歌</value>
                    <value>健身</value>
                    <value>看书</value>
                    <value>游泳</value>
                </list>
            </property>

<!--    Map注入-->
            <property name="card">
                <map>
                    <entry key="身份证" value="123...." />
                    <entry key="学生证" value="xx...." />
                    <entry key="银行卡" value="xx...." />
                </map>
            </property>

<!--    Set注入-->
            <property name="games">
                <set>
                    <value>吃鸡</value>
                    <value>王者</value>
                </set>
            </property>

<!--    Null值注入（其中空值，value属性为空即可：value=""）-->
<!--            <property name="someNull">-->
<!--                <null/>-->
<!--            </property>-->

<!--    property注入-->
            <property name="infos">
                <props>
                    <prop key="学号">20200908</prop>
                    <prop key="姓名">小梅</prop>
                    <prop key="性别">女</prop>
                </props>
            </property>
    　　</bean>
</beans>

 

四、测试类

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
        //CPX快捷键
        ApplicationContext context = new ClassPathXmlApplicationContext();
        Student student = context.getBean("student");
        System.out.println(student.toString());
    }
}