[Spring Notes] Dependency Injection

Dependency Injection: The creation of bean objects depends on the container. All properties in the bean object are injected by the container.

It can be divided into constructor injection, Set injection, and extension injection

Environment build:

Entity class:

beans.xml

 

 

Test class:

    @Test
    public void mytest(){
        ClassPathXmlApplicationContext context
                = new ClassPathXmlApplicationContext("beans.xml");
        Student student = (Student) context.getBean("student");
        System.out.println(student.toString());

    }

Test Results:

Student{name='秦江', address=Address{address='南京'},
books=[红楼梦, 西游记, 水浒传, 三国演义], 
hobbies=[睡觉, 吃饭, 听歌], 
card={身份证=1001, 校园卡=1002}, 
games=[王者荣耀, 吃鸡], 
info={学号=123, 专业=计算机, 性别=男}}