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Spring框架小白的蛻變

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9.7 內(nèi)容實(shí)用
9.8 簡(jiǎn)潔易懂
9.8 邏輯清晰

  • Bean屬性繼承

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    0 采集 收起 來(lái)源：Bean屬性繼承

    2021-04-27

  • Bean的初始化和銷毀

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  • Bean懶加載

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    0 采集 收起 來(lái)源：Bean的懶加載

    2021-04-27

  • Bean作用域 Web環(huán)境作用域：request session application

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    0 采集 收起 來(lái)源：web相關(guān)作用域

    2021-04-26 

  • 測(cè)試集中情況:
第一種：被引用bean1為單例模式，bean也為單例模式
    <bean?id?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="singleton"?/>
<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean"?scope="singleton">
????<property?ref="bean1"?name="bean1"/>
</bean>

    http://img1.sycdn.imooc.com//60857e8f000123c307310338.jpg

    第二種：被引用類bean1為多例模式，bean為單例模式
<bean?id?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="prototype"?/>
<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean"?scope="singleton">
????<property?ref="bean1"?name="bean1"/>
</bean>

    http://img1.sycdn.imooc.com//60857ef70001419f06410317.jpg

    第三種：被引用類bean1為單例，bean為多例模式
<bean?id?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="singleton"?/>
<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean"?scope="prototype">
????<property?ref="bean1"?name="bean1"/>
</bean>

    http://img1.sycdn.imooc.com//60857f7b0001db6f06440329.jpg

    第四種：被引用類bean1為多例模式，bean為多例模式
<bean?id?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="prototype"?/>
<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean"?scope="prototype">
????<property?ref="bean1"?name="bean1"/>
</bean>

    http://img1.sycdn.imooc.com//60857fe90001cb3206900292.jpg

    bean是單例模式singleton,bean1是多例模式prototype,bean依賴bean1.我們希望每次調(diào)用Bean的某個(gè)方法時(shí)，
該方法拿到的Bean1都是一個(gè)新的實(shí)例，做法如下：
    package?com.example.spring.ioc.class7;

public?abstract?class?Bean?{


????protected?abstract?Bean1?createBean1();

????public?void?printBean1(){
????????System.out.println(createBean1());
????}}
    <?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?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="prototype"?/>
????<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean"?scope="singleton">
????????<lookup-method?bean="bean1"?name="createBean1"/>
????</bean>
</beans>
    package?com.example.spring.ioc.class7;

import?org.junit.jupiter.api.Test;
import?org.springframework.context.ApplicationContext;
import?org.springframework.context.support.ClassPathXmlApplicationContext;

public?class?BeanTest?{

????@Test
????public?void?test(){
????????ApplicationContext?ac?=?new?ClassPathXmlApplicationContext("spring.xml");
????????System.out.println("--------------------------這是第一個(gè)Spring?Context?上下文----------------------------");
????????Bean?bean?=?ac.getBean("bean",Bean.class);
????????bean.printBean1();
????????bean.printBean1();
????????bean.printBean1();
????????System.out.println("--------------------------這是第二個(gè)Spring?Context?上下文----------------------------");
????????ApplicationContext?ac1?=?new?ClassPathXmlApplicationContext("spring.xml");
????????Bean?bean_1?=?ac1.getBean("bean",Bean.class);
????????bean_1.printBean1();
????????bean_1.printBean1();
????????bean_1.printBean1();
????}
}

    http://img1.sycdn.imooc.com//608581940001e81e06600323.jpg

    實(shí)體改造前：
package?com.example.spring.ioc.class7;

public??class?Bean?{
?
????public?void?printBean1(){
????????System.out.println("bean1?=?"?+?bean1);
????}

????private?Bean1?bean1;

????public?Bean1?getBean1()?{
????????return?bean1;
????}

????public?void?setBean1(Bean1?bean1)?{
????????this.bean1?=?bean1;
????}
}

<?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?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="prototype"?/>
????<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean"?scope="singleton">
????????<property?name="bean1"?ref="bean1"/>
????</bean>
</beans>

package?com.example.spring.ioc.class7;

import?org.junit.jupiter.api.Test;
import?org.springframework.context.ApplicationContext;
import?org.springframework.context.support.ClassPathXmlApplicationContext;

public?class?BeanTest?{

????@Test
????public?void?test(){
????????ApplicationContext?ac?=?new?ClassPathXmlApplicationContext("spring.xml");
????????System.out.println("--------------------------這是第一個(gè)Spring?Context?上下文----------------------------");
????????Bean?bean?=?ac.getBean("bean",Bean.class);
????????bean.printBean1();
????????bean.printBean1();
????????bean.printBean1();
????????System.out.println("--------------------------這是第二個(gè)Spring?Context?上下文----------------------------");
????????ApplicationContext?ac1?=?new?ClassPathXmlApplicationContext("spring.xml");
????????Bean?bean_1?=?ac1.getBean("bean",Bean.class);
????????bean_1.printBean1();
????????bean_1.printBean1();
????????bean_1.printBean1();
????}
}

    http://img1.sycdn.imooc.com//608582a20001cd3f06420334.jpg

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    0 采集 收起 來(lái)源：singleton、prototype

    2021-04-25

  • Singleton作用于如下如：bean作為屬性會(huì)被注入到anotherBean1 anotherBean2 anotherBean3中，這里注意，bean作為單例模式的話，只會(huì)有一個(gè)bean實(shí)例，所以注入到以上實(shí)體中的bean都是同一bean

    在一個(gè)Spring上下文環(huán)境下，單例模式會(huì)生成一個(gè)實(shí)例，如果在多個(gè)上下文環(huán)境下則會(huì)一個(gè)Spring上下文環(huán)境單例模式會(huì)生成一個(gè)實(shí)例，多個(gè)Spring上下文每個(gè)Spring上下文都會(huì)生成一個(gè)單例模式！??！

    package?com.example.spring.ioc.class7;

public?class?Bean?{

????private?Bean1?bean1;

????public?Bean1?getBean1()?{
????????return?bean1;
????}

????public?void?setBean1(Bean1?bean1)?{
????????this.bean1?=?bean1;
????}

????@Override
????public?String?toString()?{
????????return?"Bean{"?+
????????????????"bean1="?+?bean1?+
????????????????'}';
????}
}
    package?com.example.spring.ioc.class7;

public?class?Bean1?{
}
    <?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?=?"bean1"?class="com.example.spring.ioc.class7.Bean1"?scope="singleton"?/>
????<bean?id?=?"bean"?class="com.example.spring.ioc.class7.Bean">
????????<property?name="bean1"?ref="bean1"/>
????</bean>
</beans>
    package?com.example.spring.ioc.class7;

import?org.junit.jupiter.api.Test;
import?org.springframework.context.ApplicationContext;
import?org.springframework.context.support.ClassPathXmlApplicationContext;

public?class?BeanTest?{

????@Test
????public?void?test(){
????????ApplicationContext?ac?=?new?ClassPathXmlApplicationContext("spring.xml");
????????Bean?bean?=?ac.getBean("bean",Bean.class);
????????Bean1?bean1?=?ac.getBean("bean1",Bean1.class);
????????System.out.println("Bean?=?"?+?bean);
????????System.out.println("Bean1?=?"?+?bean1);
????????System.out.println(bean.toString());
????????System.out.println("--------------------------這是第二個(gè)Spring?Context?上下文----------------------------");
????????ApplicationContext?ac1?=?new?ClassPathXmlApplicationContext("spring.xml");
????????Bean?bean_1?=?ac1.getBean("bean",Bean.class);
????????Bean1?bean1_1?=?ac1.getBean("bean1",Bean1.class);
????????System.out.println("bean?=?"?+?bean_1);
????????System.out.println("bean1?=?"?+?bean1_1);
????????System.out.println(bean.toString());
????}
}

    http://img1.sycdn.imooc.com//60857336000124f708800349.jpg







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    0 采集 收起 來(lái)源：singleton、prototype

    2021-04-25 

  • 這是注入方式展示：PojoBean{
name='gavin',?
bean=com.example.spring.ioc.Bean@4c39bec8,
?num=0,
?bean1=com.example.spring.ioc.Bean@4c39bec8,?
?listStr=[str1,?str2],?
?listBean=[com.example.spring.ioc.Bean@4c39bec8],?
?setStr=[setStr1,?setStr2],?
?setBean=[com.example.spring.ioc.Bean@4c39bec8],?
?map={key1=com.example.spring.ioc.Bean@4c39bec8},?
?mapBean={com.example.spring.ioc.Bean@4c39bec8=com.example.spring.ioc.Bean@4c39bec8},?
?pro={proKey=proValue}
?}
    package?com.example.spring.ioc;

import?org.junit.jupiter.api.Test;
import?org.springframework.context.ApplicationContext;
import?org.springframework.context.support.ClassPathXmlApplicationContext;

public?class?BeanTests?{

????@Test
????public?void?Test(){
????????//通過(guò)構(gòu)造方法實(shí)例化bean
????????ApplicationContext?ac?=?new?ClassPathXmlApplicationContext("spring.xml");
????????System.out.println("這是注入方式展示："?+?ac.getBean("pojoBean").toString());
????}
}
    package?com.example.spring.ioc;

import?java.util.List;
import?java.util.Map;
import?java.util.Properties;
import?java.util.Set;

public?class?PojoBean?{

????private?String?name;

????private?Bean?bean;

????private?Integer?num;

????private?Bean?bean1;

????private?List<String>?listStr;

????private?List<Bean>?listBean;

????private?Set<String>?setStr;

????private?Set<Bean>?setBean;

????private?Map<String,Bean>?map;

????private?Map<Bean,Bean>?mapBean;

????private?Properties?pro;

????public?PojoBean(String?name,?Bean?bean)?{
????????this.name?=?name;
????????this.bean?=?bean;
????}

????public?String?getName()?{
????????return?name;
????}

????public?void?setName(String?name)?{
????????this.name?=?name;
????}

????public?Bean?getBean()?{
????????return?bean;
????}

????public?void?setBean(Bean?bean)?{
????????this.bean?=?bean;
????}

????public?Integer?getNum()?{
????????return?num;
????}

????public?void?setNum(Integer?num)?{
????????this.num?=?num;
????}

????public?Bean?getBean1()?{
????????return?bean1;
????}

????public?void?setBean1(Bean?bean1)?{
????????this.bean1?=?bean1;
????}

????public?List<String>?getListStr()?{
????????return?listStr;
????}

????public?void?setListStr(List<String>?listStr)?{
????????this.listStr?=?listStr;
????}

????public?List<Bean>?getListBean()?{
????????return?listBean;
????}

????public?void?setListBean(List<Bean>?listBean)?{
????????this.listBean?=?listBean;
????}

????public?Set<String>?getSetStr()?{
????????return?setStr;
????}

????public?void?setSetStr(Set<String>?setStr)?{
????????this.setStr?=?setStr;
????}

????public?Set<Bean>?getSetBean()?{
????????return?setBean;
????}

????public?void?setSetBean(Set<Bean>?setBean)?{
????????this.setBean?=?setBean;
????}

????public?Map<String,?Bean>?getMap()?{
????????return?map;
????}

????public?void?setMap(Map<String,?Bean>?map)?{
????????this.map?=?map;
????}

????public?Map<Bean,?Bean>?getMapBean()?{
????????return?mapBean;
????}

????public?void?setMapBean(Map<Bean,?Bean>?mapBean)?{
????????this.mapBean?=?mapBean;
????}

????public?Properties?getPro()?{
????????return?pro;
????}

????public?void?setPro(Properties?pro)?{
????????this.pro?=?pro;
????}

????@Override
????public?String?toString()?{
????????return?"PojoBean{"?+
????????????????"name='"?+?name?+?'\''?+
????????????????",?bean="?+?bean?+
????????????????",?num="?+?num?+
????????????????",?bean1="?+?bean1?+
????????????????",?listStr="?+?listStr?+
????????????????",?listBean="?+?listBean?+
????????????????",?setStr="?+?setStr?+
????????????????",?setBean="?+?setBean?+
????????????????",?map="?+?map?+
????????????????",?mapBean="?+?mapBean?+
????????????????",?pro="?+?pro?+
????????????????'}';
????}
}
    <?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">
????<!--通過(guò)構(gòu)造器方法實(shí)例化bean-->
????<bean?id?=?"bean"?class?=?"com.example.spring.ioc.Bean"?name?=?"bean_1,bean_2"/>
????<!--別名-->
????<alias?name="bean"?alias="bean1"?/>
????<!--通過(guò)靜態(tài)方法實(shí)例化bean-->
????<bean?id?=?"bean2"?class?=?"com.example.spring.ioc.Bean2Factory"?factory-method="getBean"?/>
????<!--通過(guò)實(shí)例方法實(shí)例化bean-->
????<bean?id?=?"bean3Factory"?class="com.example.spring.ioc.Bean3Factory"?/>
????<bean?id?=?"bean3"?class="com.example.spring.ioc.Bean3"?factory-bean="bean3Factory"
??????????factory-method="getBean"?/>

????<!--注入bean的方式-->
????<bean?id?=?"pojoBean"?class="com.example.spring.ioc.PojoBean">
????????<constructor-arg?index="0"?value="gavin"?type="java.lang.String"?name="name"/>
????????<constructor-arg?index="1"?ref="bean"?type="com.example.spring.ioc.Bean"?name="bean"/>

????????<property?name="bean1"?ref="bean"?/>
????????<property?name="num"?value="0"?/>

????????<property?name="listBean"?>
????????????<list>
????????????????<ref?bean="bean"/>
????????????</list>
????????</property>

????????<property?name="listStr">
????????????<list>
????????????????<value>str1</value>
????????????????<value>str2</value>
????????????</list>
????????</property>

????????<property?name="setBean">
????????????<set>
????????????????<ref?bean="bean"/>
????????????</set>
????????</property>

????????<property?name="setStr">
????????????<set>
????????????????<value>setStr1</value>
????????????????<value>setStr2</value>
????????????</set>
????????</property>

????????<property?name="map">
????????????<map>
????????????????<entry?key="key1"?value-ref="bean"?/>
????????????</map>
????????</property>
????????<property?name="mapBean">
????????????<map>
????????????????<entry?key-ref="bean"?value-ref="bean"/>
????????????</map>
????????</property>

????????<property?name="pro">
????????????<props>
????????????????<prop?key="proKey"?>proValue</prop>
????????????</props>
????????</property>
????</bean>
</beans>
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    0 采集 收起 來(lái)源：注入Bean方式介紹

    2021-04-25

  • Spring實(shí)例化Bean?

    1. 通過(guò)構(gòu)造方法實(shí)例化bean

    2. 通過(guò)靜態(tài)方法實(shí)例化bean

    3. 通過(guò)實(shí)例方法實(shí)例化bean

    4. Bean的別名? ? ? ?

    package?com.example.spring.ioc;

public?class?Bean?{
????public?Bean()?{
????????System.out.println("我是Bean的構(gòu)造器！");
????}
}
    package?com.example.spring.ioc;

public?class?Bean2?{
????public?Bean2()?{
????????System.out.println("我是Bean2的構(gòu)造器！");
????}
}
    package?com.example.spring.ioc;

public?class?Bean2Factory?{

????public?static?Bean2?getBean(){
????????return?new?Bean2();
????}
}
    package?com.example.spring.ioc;

public?class?Bean3?{
????public?Bean3()?{
????????System.out.println("我是Bean3的構(gòu)造器！");
????}
}
    package?com.example.spring.ioc;

public?class?Bean3Factory?{

????public??Bean3?getBean(){
????????return?new?Bean3();
????}
}
    <?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">
????<!--通過(guò)構(gòu)造器方法實(shí)例化bean-->
????<bean?id?=?"bean"?class?=?"com.example.spring.ioc.Bean"?name?=?"bean_1,bean_2"/>
????<!--別名-->
????<alias?name="bean"?alias="bean1"?/>
????<!--通過(guò)靜態(tài)方法實(shí)例化bean-->
????<bean?id?=?"bean2"?class?=?"com.example.spring.ioc.Bean2Factory"?factory-method="getBean"?/>
????<!--通過(guò)實(shí)例方法實(shí)例化bean-->
????<bean?id?=?"bean3Factory"?class="com.example.spring.ioc.Bean3Factory"?/>
????<bean?id?=?"bean3"?class="com.example.spring.ioc.Bean3"?factory-bean="bean3Factory"
??????????factory-method="getBean"?/>
</beans>

    package?com.example.spring.ioc;

import?org.junit.jupiter.api.Test;
import?org.springframework.context.ApplicationContext;
import?org.springframework.context.support.ClassPathXmlApplicationContext;

public?class?BeanTests?{

????@Test
????public?void?Test(){
????????//通過(guò)構(gòu)造方法實(shí)例化bean
????????ApplicationContext?ac?=?new?ClassPathXmlApplicationContext("spring.xml");
????????Bean?bean?=?ac.getBean("bean",Bean.class);
????????System.out.println("這是bean?:?"?+?bean);
????????System.out.println("通過(guò)構(gòu)造器實(shí)例化bean完成！");
????????//通過(guò)靜態(tài)方法實(shí)例化bean
????????Bean2?bean2?=?ac.getBean("bean2",Bean2.class);
????????System.out.println("這是Bean2?:?"?+?bean2);
????????System.out.println("通過(guò)靜態(tài)方法實(shí)例化bean2完成！");
????????//通過(guò)實(shí)例化方法實(shí)例化bean
????????Bean3?bean3?=?ac.getBean("bean3",Bean3.class);
????????System.out.println("這是bean3?:?"?+?bean3);
????????System.out.println("通過(guò)實(shí)例方法實(shí)例化bean完成！");
????????//bean別名
????????Bean?bean1?=?ac.getBean("bean1",Bean.class);
????????System.out.println("這是別名bean1?:?"?+?bean1);
????????Bean?bean_1?=?ac.getBean("bean_1",Bean.class);
????????System.out.println("這是別名bean_1?:?"?+?bean_1);
????????Bean?bean_2?=?ac.getBean("bean_2",Bean.class);
????????System.out.println("這是別名bean_2?:?"?+?bean_2);
//????????System.out.println("這是注入方式展示："?+?ac.getBean("pojoBean").toString());
????}
}


    http://img1.sycdn.imooc.com//6084dcaf0001790118650568.jpg

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  • IOC(Inversion of Control)控制反轉(zhuǎn)、依賴注入

    1. 控制什么？

      控制對(duì)象的創(chuàng)建及銷毀（生命周期）

    2. 反轉(zhuǎn)什么？

      將對(duì)象的控制權(quán)交給IOC容器

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    0 采集 收起 來(lái)源：IoC概念介紹

    2021-04-21 

  • Spring?IOC介紹

    http://img1.sycdn.imooc.com//607fdf380001354a05250482.jpg

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    0 采集 收起 來(lái)源：課程概述

    2021-04-21

  • ioc為控制反轉(zhuǎn)，依賴注入。 控制什么 控制對(duì)象，對(duì)象的創(chuàng)建和銷毀。依賴注入什么 通過(guò)ioc控制對(duì)象。
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  • 假設(shè)不把控制權(quán)交給ioc，那換一輛車就得重寫方法

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    0 采集 收起 來(lái)源：IoC概念介紹

    2021-02-25

  • 如果某個(gè)Bean在程序整個(gè)運(yùn)行周期都可能不會(huì)被使用，那么可以考慮懶加載

    優(yōu)點(diǎn)：盡可能的節(jié)省了資源

    缺點(diǎn)：可能會(huì)導(dǎo)致某個(gè)操作響應(yīng)時(shí)間增加

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    0 采集 收起 來(lái)源：Bean的懶加載

    2021-01-20

  • Bean1和Bean2的作用域

    http://img1.sycdn.imooc.com//5fe166300001412d08290223.jpg

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    0 采集 收起 來(lái)源：singleton、prototype

    2020-12-22

  • 注解注入beanhttp://img1.sycdn.imooc.com//5fd97b030001367409280499.jpg

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    0 采集 收起 來(lái)源：通過(guò)注解注入Bean

    2020-12-16

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需要具備Java語(yǔ)法基礎(chǔ)，了解Java Web基礎(chǔ)知識(shí)。
老師告訴你能學(xué)到什么？
1、什么是IoC 2、Spring Bean的管理 3、什么是懶加載

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