Spring中基于XML的setter装配方式

导入Spring依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.6.RELEASE</version>
        </dependency>
    </dependencies>

创建实体类，实体类中必须写属性的setter方法

public class HelloSpring {
    private String userName;
    public void setUserName(String userName){
        this.userName=userName;
    }
    public void show(){
        System.out.println(userName);
    }
}

创建application.xml文件装配，bean元素指定类，propert装配类中的属性值

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="helloSpring" class="HelloSpring">
        <property name="userName" value="123"></property>
    </bean>
</beans>

创建测试类，使用spring容器获取HelloSpring对象

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

class HelloSpringTest {
    public static void main(String[] args) {
        //获取spring容器
        ApplicationContext  ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        //从容器中获取对象
        HelloSpring helloSpring = (HelloSpring)ac.getBean("helloSpring");
        helloSpring.show();
    }
}

目录结构如下：