Spring架构开荒

秒速五厘米 2022-01-21 02:47 222阅读 0赞

# IOC 控制反转 #

Inversion of Control  
控制反转 依赖注入  
**1 控制什么？**

控制对象的创建以及销毁

**2 反转什么？**

将对象的控制权交给IOC容器

举例说明：

张三要回家  
对象：

*  小明 人
 *  车 奔驰 宝马  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70]  
    Audi.java

public class Audi{
    	
    	public void start(){
    		System.out.println("Audi.start");
    	}
    
    	public void turnLeft(){
    		System.out.println("Audi.start");
    	}
    	public void trunRight(){
    		System.out.println("Audi.start");
    	}
    	public void stop(){
    		System.out.println("Audi.start");
    	}
    }

### 传统方式 ###

张三控制车辆的流程：  
**1 创建一辆车**

Audi audi = new Audi()；

**2 控制车辆的启动 直行 左右转**

audi.start();
    audi.turnLeft();
    audi.trunRight();
    turn.stop();

**3 销毁车辆**

java的jcc组织垃圾回收处理掉

#### 张三的其他需求 ####

比如看电影

public void goMovice(){
    		public void start(){
    		System.out.println("Audi.start");
    	}
    	public void stop(){
    		System.out.println("Audi.start");
    	}
    }

**现在张三要换一辆Buick车**

在Zhangsan.java当就需要全部更改  
产生了**高耦合性**

### 改进方案 1 ###

把车升级到张三的属性域里面  
这样就降低了耦合度

public class ZhangSan {
    
        Buick car = new Buick();
    
        public void goHome(){
            car.start();
            car.turnRight();
            car.turnLeft();
            car.stop();
        }
    }

### 改进方案 2 ###

接口Car

public interface Car {
    
        public void start();
        public void turnLeft();
        public void turnRight();
        public void stop();
    }

奔驰车实现这个车的接口

public class Audi implements Car{
    
        public void start(){
            System.out.println("Audi.start");
        }

在ZhangSan当中用构造方法传进去Car

private Car car;
        public ZhangSan(Car car){
            this.car = car;
        }

**到现在Car已经不用ZhangSan来创建了 由IOC来创建了**

车辆的控制权完全交给了IOC

## 实现自己编写一个IOC的容器 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 1]

#### 约定 ####

*  所有的Bean的生命周期交由IOC容器管理
 *  所有被依赖的Bean通过构造方法执行注入
 *  被依赖的Bean需要优先创建(创建张三前先创建奥迪)

所有被依赖的Bean通过构造方法执行注入

public HumanWithCar(Car car) {
            this.car = car;
        }
    
        private Car car;

**Class003Test.java//测试IOC容器**

public class Class003Test {
    
        private IoCConteainer ioCConteainer = new IoCConteainer();
    
        @Before//创建bean
        public void before(){
            ioCConteainer.setBean(Audi.class, "Audi");
            ioCConteainer.setBean(Buick.class, "Buick");
            ioCConteainer.setBean(ZhangSan.class, "ZhangSan","Audi");
            ioCConteainer.setBean(Lisi.class, "Lisi","Buick");
        }
    
        @Test//使用bean
        public void test(){
            Human ZhangSan = (Human) ioCConteainer.getBean("ZhangSan");
            ZhangSan.goHome();
            Human Lisi = (Human) ioCConteainer.getBean("Lisi");
            Lisi.goHome();
        }
    }

# Spring IOC入门 #

1 创建一个javabean

public class Bean{
    	public Bean(){
    		System.out.println("Bean.bean");
    	}
    }

2 在pom中加入spring的依赖

spring-core
    spring-context

3 在resources文件夹下建立一个spring.xml文件

//class = 1 中创建的Bean 并给一个唯一标示id
    <bena class = "bean" class="com.imooc.spring.ioc.class004.Bean">

//测试

public class Class004Test {
        @Test
        public void test(){
            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml);
            Bean bean = context.getBean("bean",Bean.class);
            System.out.println("bean = " + bean);
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 2]

## 实例化Bean方式 ##

*  构造方法实例化
 *  静态方法
 *  实例方法

### 构造方法实例化 ###

**1 创建Bean.java**

public class Bean {
        public Bean(){
            System.out.println("Bean.bean");
        }
    }

**2 在spring.xml中配置bean**

**3 在class005Test.java中实例**

public class class005Test {
        @Test
        public void test(){
            //取上下文
            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
            //通过context get一个Bean
            Bean bean = context.getBean("bean", Bean.class);
            System.out.println("bean = " + bean);
        }
    }

### 静态方法实例化 ###

**1 创建一个BeanFactory.java**  
通过BeanFactory的getBean方法实例化Bean

public class Bean2Factory {
        public static Bean2 getBean2(){
            return new Bean2();
        }
    }

**2 spring.xml中进行配置**

**3 Class005Test.java**

Bean2 bean2 = context.getBean("bena2", Bean2.class);

### 实例方法实例化Bean ###

**1 创建一个Bean3Factory.java**  
通过BeanFactory的getBean方法实例化Bean

public class Bean3Factory {
        public static Bean3 getBean3(){
            return new Bean3();
        }
    }

**2 spring.xml中进行配置**

**3 Class005Test.java**

Bean3 bean3 = context.getBean("bean3",Bean3.class);
            System.out.println("bean3 = " + bean3);

### 给Bean取一个别名 ###

**1 name属性**

**2 alias属性**

**测试**

Bean1 bean1_1 = context.getBean("bean1_1",Bean1.class);
    System.out.println("bean1_1 = " + bean1_1);
    Bean1 bean1_2 = context.getBean("bean1_2",Bean1.class);
    System.out.println("bean1_2 = " + bean1_2);

但是这些名字不同的都是同一个Bean  
![在这里插入图片描述][20190608194535928.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 3]

## 注入Bean的方式 ##

*  构造方法注入Bean
 *  set方法注入Bean
 *  集合类Bean的型注入
    
     *  List
     *  Set
     *  Map
     *  Propertise
 *  null值注入
 *  注入时创建内部Bean

**前期准备**  
AnotherBean.java

public class AnotherBean {
        
    }

Bena.java

public class Bean {
    
        private AnotherBean anotherBean;
        private String string;
    
    
    
        public AnotherBean getAnotherBean() {
            return anotherBean;
        }
    
        public void setAnotherBean(AnotherBean anotherBean) {
            this.anotherBean = anotherBean;
        }
    
        public String getString() {
            return string;
        }
    
        public void setString(String string) {
            this.string = string;
        }
    }

### 构造方法注入Bean ###

在Bean.java中写入构造方法

public Bean(AnotherBean anotherBean, String string) {
            this.anotherBean = anotherBean;
            this.string = string;
        }

spring.xml

//index：参数是构造方法中的第几个参数
    //name：当前参数的参数名字
    //type：参数的类型
    //value: 给参数赋值 适合简单的数据类型 string integer  double float
    //ref：复杂数据类型赋值	对应anotherbean的id

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 4]  
**简单写法**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 5]

#### set方法注入Bean ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 6]

#### 集合类型的Bean的注入 ####

*  list
 *  set
 *  map
 *  propertise

**List**  
spring.xml

<util:property name = "stringList">
            <list>
                <value>aaaaa</value>
                <value>ddddd</value>
            </list>
        </util:property>
        <util:property>
            <list>
                <ref bean = "anotherBean"/>
                <ref bean = "anotherBean"/>
            </list>
        </util:property>

<util:propertiy name="properties">
            <prop key="aaaaa">bbbbb</prop>
        </util:propertiy>

class005Test.java

Bean bean = context.getBean("bean",Bean.class);
            System.out.println("bean.getStringList() = " + bean.getSring());
            System.out.println("bean.getProperties() = " + bean.getProperties());

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 7]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 8]

#### null注入 ####

Bean.java

public AnotherBean getAnotherBean2() {
            return anotherBean2;
        }
    
        public void setAnotherBean2(AnotherBean anotherBean2) {
            this.anotherBean2 = anotherBean2;
        }
    
        private AnotherBean anotherBean2;

spring.xml

<util:properties name = "anotherBean2">
            <null/>
        </util:properties>

class005Test.java

System.out.println("bean.getAnotherBean2()" + bean.getAnotherBean2());

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 9]

#### 注入的时候创建内部Bean ####

<util:properties>
            <bean class = "com.example.controller.AnotherBean"/>
        </util:properties>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 10]

### Bean的作用域的问题 ###

*  Sinleton作用域
 *  prototype作用域
 *  Web环境作用域
    
     *  requset
     *  session
     *  application
     *  websocket
 *  自定义作用域
    
     *  SimpleThreadScope作用域

#### Singleton作用域（单例模式） ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 11]  
右侧的Bean会通过Spring注入左侧三个Bean中 只会创建一个Bean

Bean.java

public class Bean {
    
        public Beanb getBeanb() {
            return beanb;
        }
    
        public void setBeanb(Beanb beanb) {
            this.beanb = beanb;
        }
    
        private Beanb beanb;
    
        @Override
        public String toString() {
            return "Bean{" +
                    "beanb=" + beanb +
                    '}';
        }
    }

spring.xml

public class Class007Test {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        Beanb bean2_1 = context.getBean("Beanb",Beanb.class);
        System.out.println("bean2_1 = " + bean2_1);
        Beanb bean2_2 = context.getBean("bean2_2 = " + bean2_2);
        System.out.println("bean2_2 = " bean2_2);
        bean bean1 = context.getBean("bean",Bean.class);
        System.out.println("bean = " + bean);
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][20190611215516484.png]

#### Prototype作用域（多例模式） ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 13]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 14]

### Web相关作用域 ###

*  requset作用域
 *  sessiong作用域
 *  applicatiton作用域
 *  websocker作用域（很少使用）

**SpringWeb上下文环境**

如果使用DispatcherServlet 不需要增加其他配置

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 15]

**web.xml**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 16]  
RequsetController.java  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 17]  
spring.xml

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 18]  
每次刷新@contraller不变

每次刷新@contraller改变  
**回顾**

*  request：每个requset请求斗湖创建一个单独的实例
 *  session：每个session都会创建一个单独的实例
 *  application：每个servletContext都会创建一个单独的实例
 *  websocket：每个websocket链接都会创建一个单独实例

#### 自定义作用域 ####

*  SimpleThreadScope作用域

MyScope.java  
![在这里插入图片描述][2019061210352127.png]  
spring.xml

### Bean的懒加载 ###

Spring容器会在创建容器时提前初始化Singleton作用域的bean  
但如果Bean被标记了lazy-init = “true”  
那么该Bean只有在其被需要的时候才会初始化

**只对singleton作用域的bean有效**  
多例模式不知道bean什么时候被实例化

单一的Bean需要懒加载

所有的bean需要懒加载

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 20]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 21]  
位所有的bean都设置默认的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 22]

### Bean初始化及销毁逻辑处理 ###

如果Bean实例化之后执行一些逻辑 有两种方法

*  bean标签里的属性 initmethod
 *  让Bean实现InitializingBean接口

如果Bean在销毁之前需要执行一些逻辑 两种方法

*  destory-method
 *  DisposableBean接口

### Bean属性继承 ###

场景1  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 23]  
**简化代码**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 24]  
场景2  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 25]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 26]

# 注解 #

spring2.5之后用注解取代xml

## xml 与 annotation对比 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 27]  
MyConfiguration.java

import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class MyConfiguration {
    
        @Bean //这里也可以用（value=“bean1命名”）
        public Bean bean1(){
            return new Bean();
        }
    }

Test.java

import com.example.controller.People.MyConfiguration;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    public class Class008Test {
        
        @Test
        public void test(){
            ApplicationContext context = new AnnotationConfigApplicationContext(MyConfiguration.class);
            Bean1 bean1 = context.getBean("bean",Bean.class);
            System.out.println("bean1 = " + bean1);
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 28]

### 简化代码 ###

conpoent-scan包扫描  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 29]  
@ component注解  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 30]

#### 给Bean取别名 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 31]

## 通过注解注入Bean ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 32]  
**构造方法和Set方法注入Bean**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 33]  
**通过属性直接注入**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 34]  
**实例化和注入时指定Bean的id**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 35]  
**List/Set注入**  
直接注入List实例  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 36]  
将多个泛型实例注入到List  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 37]  
**Map注入**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 38]  
多个泛型实例注入Map  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 39]  
**String Integer类型的直接赋值**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 40]  
**Spring Ioc容器内置借口实例注入**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 41]  
可以直接将ApplicationContext注入进来，也可以注入BeanFactory、Environment、ResourceLoader、ApplicationEventPublisher\\MessagerSource及其实现类

### SpringIoc注解设定Scope(作用域) ###

**Spring预定义作用域**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 42]  
**自定义作用域**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 43]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 44]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 45]  
**方法注入**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 46]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 47]

### 通过注解开启Bean的懒加载 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 48]

## 通过注解编写Bean初始化及销毁 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zOTM4MTgzMw_size_16_color_FFFFFF_t_70 49]  
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