Spring:bean的生命周期以及自动装配

 1 package com.me.zhuru;
 2 
 3 /**
 4  * @author sbr
 5  * @create 2020-11-09 23:56
 6  */
 7 public class Orders {
 8     private String oname;
 9 
10     public Orders(){
11         System.out.println("第一步执行无参数构造");
12     }
13 
14     public void setOname(String oname) {
15         System.out.println("第二步调用set方法设置属性值");
16         this.oname = oname;
17     }
18 
19     public void init(){
20         System.out.println("第四步执行初始化方法");
21     }
22 
23     public void destory(){
24         System.out.println("第七步执行销毁方法");
25     }
26 }

 1 package com.me.zhuru;
 2 
 3 import org.springframework.beans.BeansException;
 4 import org.springframework.beans.factory.config.BeanPostProcessor;
 5 import org.springframework.lang.Nullable;
 6 
 7 /**
 8  * @author sbr
 9  * @create 2020-11-10 0:07
10  */
11 public class MyBeanPost implements BeanPostProcessor {
12     public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
13         System.out.println("第三步在初始化之前执行的方法postProcessBeforeInitialization");
14         return bean;
15     }
16 
17     public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
18         System.out.println("第五步在初始化之前执行的方法postProcessAfterInitialization");
19         return bean;
20     }
21 }

1     @Test
2     public void test9() {
3         ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("bean8.xml");
4         Orders book = context.getBean("order", Orders.class);
5         System.out.println("第六步 获取创建bean实例对象");
6         context.close();
7 
8     }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 5     <bean id="order" class="com.me.zhuru.Orders" init-method="init" destroy-method="destory">
 6         <property name="oname" value="哈哈" ></property>
 7 
 8     </bean>
 9     <bean id="myBeanPost" class="com.me.zhuru.MyBeanPost"></bean>
10 </beans>

 1 package com.me.zhuru;
 2 
 3 /**
 4  * @author sbr
 5  * @create 2020-11-09 21:08
 6  */
 7 public class Emp {
 8     //员工属于一个部门
 9     private Dept dept;
10 //    private String ename;
11 //    private String gender;
12 
13     public Dept getDept() {
14         return dept;
15     }
16 
17     public void setDept(Dept dept) {
18         this.dept = dept;
19     }
20 
21 //    public void setEname(String ename) {
22 //        this.ename = ename;
23 //    }
24 //
25 //    public void setGender(String gender) {
26 //        this.gender = gender;
27 //    }
28 //
29 //    public void add(){
30 //        System.out.println(ename+"::"+gender+"::"+dept);
31 //    }
32 
33     @Override
34     public String toString() {
35         return "Emp{" +
36                 "dept=" + dept +
37                 ‘}‘;
38     }
39 
40     public void add(){
41         System.out.println(dept);
42     }
43 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4 
 5        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 6     <!--自动注入-->
 7     <!--
 8     byName:根据属性名称注入：要求注入的bean的id与类中属性名称相同
 9     byType:根据属性类型注入
10     -->
11     <bean id="emp" class="com.me.zhuru.Emp" autowire="byType"></bean>
12 
13 
14     <bean id="dept" class="com.me.zhuru.Dept">
15         <property name="name" value="haha"></property>
16     </bean>
17 </beans>

 1 package com.me.zhuru;
 2 
 3 /**
 4  * @author sbr
 5  * @create 2020-11-09 21:07
 6  */
 7 public class Dept {
 8     private String name;
 9 
10     public void setName(String name) {
11         this.name = name;
12     }
13 
14     @Override
15     public String toString() {
16         return "Dept{" +
17                 "name=‘" + name + ‘\‘‘ +
18                 ‘}‘;
19     }
20 }