Spring依赖注入构造器注入（通过构造函数注入）

Posted 2020-09-30 与f

在src目录下建立applicationContext.xml   (Spring 管理 bean的配置文件)

<?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 = "dog" class = "com.cc8w.Entity.Dog">
        <constructor-arg>
        <value>旺财</value>
        </constructor-arg>
        <constructor-arg>
        <value>20</value>
        </constructor-arg>
        <constructor-arg>
        <value>雄性</value>
        </constructor-arg>
    </bean>
</beans>

2.java的数据类型

package com.cc8w.Entity;

public class Dog {
    private String names;
    private int age;
    private String sex;
    
    public Dog(String names, int age, String sex) {
        super();
        this.names = names;
        this.age = age;
        this.sex = sex;
    }
    public String getNames() {
        return names;
    }
    public void setNames(String names) {
        this.names = names;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    
}

3.测试类

package com.cc8w;

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

import com.cc8w.Entity.Dog;

public class Test01 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //applicationContext 管理bean
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Dog dog = (Dog)context.getBean("dog");
        System.out.println(dog.getNames());
        System.out.println(dog.getAge());
        System.out.println(dog.getSex());
    }

}

结果：