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fix:Spring相关面试题
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‎design-pattern/src/main/java/com/github/guang19/designpattern/singleton/Eager.java‎

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{
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return eager;
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}
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}

‎design-pattern/src/main/java/com/github/guang19/designpattern/singleton/Lazy.java‎

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package com.github.guang19.designpattern.singleton;
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import java.util.TreeMap;
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import java.util.UUID;
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/**
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* @author yangguang
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{
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private static volatile Lazy lazy = null;
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public static final String s = "a";
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public static final String s2 = UUID.randomUUID().toString();
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static
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{
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System.out.println("init");
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}
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private Lazy(){}
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//懒汉式只在第一次获取的时候创建单例
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}
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return lazy;
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}
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static class T{
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private String name;
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public T()
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{ }
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public String getName()
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{
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return name;
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}
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public void setName(String name)
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{
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this.name = name;
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}
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}
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public static void main(String[] args)
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{
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TreeMap<T,Object> treeMap = new TreeMap<>();
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treeMap.put(new T(),"a");
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treeMap.put(new T(),"b");
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treeMap.put(new T(),"c");
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System.out.println(treeMap);
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}
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}

‎spring-learning/Spring.md‎

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## Spring复习
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## Spring常见面试题
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对于Spring的源码我不想一段一段的贴,毕竟Spring的代码体量是相当多了,不过我不贴不代表不看,相反必须看,因为Spring加载容器时的拓展点很多,有必要搞清楚这些拓展点的执行顺序.
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然后我整理下关于Spring的常见问题,这些问题的回答有我个人的理解,也有参考网上一些大神的文章.
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---
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#### 什么是Spring Framework?
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Spring是一个轻量级,开源的Java应用开发框架.它使开发Java应用程序变得更加简单,并且使用它开发可以降低应用架构之间的耦合性.
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#### 什么是Spring Framework
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Spring是一个轻量级的，开源的Java应用程序开发框架。它提供的IOC和AOP等核心功能，能够使开发者很方便的开发出松耦合的应用。
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#### Spring Framework的好处?
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1. 应用程序模块之间的解耦
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2. 组件的自由度(Spring提供了各种不同类型的组件(aop,tx,dao,web等等)用户可以自由挑选需要组件与Spring无缝集成)
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3. 开源免费
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#### Spring的优缺点
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##### Spring的优点:
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1. 方便解耦，简化开发
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将系统的类之间的复杂关系，交由Spring IOC工厂容器管理。
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2. AOP支持
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Spring 提供 AOP模块，能够很方便的编写出AOP程序.
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3. 声明式事务
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只需要通过配置或注解就可以完成对事务的支持，而不需要手动的编写事务代码
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4. 第三方框架无缝集成
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Spring可以很方便的将第三方框架继承到系统中，很灵活。
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...
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##### Spring的缺点:
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1. 复杂
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Spring发展到现在，确认有些复杂了，但是对于它解决的问题来说，复杂已经不算什么了。
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2. 效率
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Spring内部依赖反射，而反射的效率正是它的缺点。
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...
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#### Spring Framework提供了哪些模块?
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1. IOC模块: core,bean,context,spel,aop...
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2. DAO模块: jdbc,orm,oxm,transaction,jms,tx...
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3. WEB模块: web,mvc,webflux,websocket...
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4. AOP模块: aop,aspectj....
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5. 测试模块: test
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#### Spring 主要提供了哪些模块
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1. core模块提供IOC和DI等核心功能
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2. aop模块提供面向切面编程的实现
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3. web模块提供对web应用的支持
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4. dao模块提供数据库方面的支持
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5. test模块提供测试方面的支持
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#### Spring主要使用了哪些设计模式
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```text
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Spring使用的设计模式有很多，此处只列举几个常见的
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```
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1. 工厂模式
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BeanFactory 就是简单工厂的实现，用来创建和获取Bean
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2. 单例模式
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Spring容器的Bean默认是单例的
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3. 代理模式
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aop使用的就是代理模式
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4. 模板方法模式
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jdbcTemplate等就使用模板方法模式
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5. 观察者模式
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当有事件触发时，该事件的监听者(观察者)就会做出相应的动作。
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...
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#### Spring IOC容器的配置方式有哪些？
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#### Spring IOC容器的配置方式有哪些？
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1. xml (不再推荐使用)
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2. 注解(推荐使用)
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3. Java API(和注解一起使用)

‎spring-learning/pom.xml‎

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<groupId>org.springframework</groupId>
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<artifactId>spring-beans</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-aop</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-tx</artifactId>
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</dependency>
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<!--lombok-->
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<dependency>
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<groupId>org.projectlombok</groupId>

‎spring-learning/src/main/java/com/github/guang19/spring/ApplicationContextTest.java‎

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package com.github.guang19.spring;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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/**
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* @author yangguang
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* @date 2020/3/7
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* @description <p></p>
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*/
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public class ApplicationContextTest
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{
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public static void main(String[] args)
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{
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AnnotationConfigApplicationContext context =
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new AnnotationConfigApplicationContext("com.github.guang19.spring.config");
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System.out.println(context.getBean("person"));
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}
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}

‎spring-learning/src/main/java/com/github/guang19/spring/Person.java‎

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package com.github.guang19.spring;
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import lombok.*;
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/**
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* @author yangguang
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* @date 2020/3/7
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* @description <p>测试bean</p>
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*/
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@Getter
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@Setter
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@ToString
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@NoArgsConstructor
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public class Person
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{
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private Long personId;
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private String personName;
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private Integer age;
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public Person(Long personId, String personName, Integer age)
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{
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System.out.println("init bean type of person");
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this.personId = personId;
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this.personName = personName;
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this.age = age;
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}
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}

‎spring-learning/src/main/java/com/github/guang19/spring/config/AwareT.java‎

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package com.github.guang19.spring.config;
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/**
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* @author yangguang
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* @date 2020/3/7
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* @description <p></p>
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*/
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public class AwareT
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{
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}

‎spring-learning/src/main/java/com/github/guang19/spring/config/BeanFactoryPostProcessorT.java‎

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package com.github.guang19.spring.config;
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/**
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* @author yangguang
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* @date 2020/3/7
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* @description <p></p>
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*/
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public class BeanFactoryPostProcessorT
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{
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}

‎spring-learning/src/main/java/com/github/guang19/spring/config/BeanPostProcessorT.java‎

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package com.github.guang19.spring.config;
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/**
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* @author yangguang
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* @date 2020/3/7
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* @description <p></p>
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*/
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public class BeanPostProcessorT
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{
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}

‎spring-learning/src/main/java/com/github/guang19/spring/config/ConfigurationContext.java‎

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package com.github.guang19.spring.config;
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import com.github.guang19.spring.Person;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.factory.*;
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import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
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import org.springframework.beans.factory.config.BeanPostProcessor;
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import org.springframework.context.ApplicationContextAware;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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/**
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* @author yangguang
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* @date 2020/3/7
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* @description <p></p>
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*/
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@Configuration
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public class ConfigurationContext
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{
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@Bean
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public Person person()
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{
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return new Person(1L,"yxg1",19);
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}
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}

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