Spring 构造器注入(IOC)

左手的ㄟ右手 2022-12-17 10:55 153阅读 0赞

通过构造方法进行属性的注入

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### 一、新建类 ###

创建类，定义属性并创建对应的有参构造方法

Order.java

/**
     * 使用有参构造注入
     */
    public class Order {
        private String oname;
        private String address;
    
        //有参构造
        public Order(String oname, String address) {
            this.oname = oname;
            this.address = address;
        }
        public void orderTest(){
            System.out.println(oname+"    "+address);
        }
    }

### 二、编写配置文件 ###

在配置文件中配置对象创建并进行属性注入

bean3.xml

<?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="order" class="com.health.IOC.C_construct注入.Order">
            
            <constructor-arg name="oname" value="iphone"/>
            <constructor-arg name="address" value="American"/>
    
            
        </bean>
    
    </beans>

### 三、测试 ###

test03.java

public class test03 {
        public static void main(String[] args) {
            ApplicationContext context = new ClassPathXmlApplicationContext("com/health/IOC/C_construct注入/bean3.xml");
            Order order = context.getBean("order", Order.class);
            order.orderTest();
        }
    }

输出结果：

![20201023142758194.png][]

[20201023142758194.png]: /images/20221122/d22d17e370874ff8b34fc5a39472a3f7.png