手写Spring框架

叁歲伎倆 2022-03-22 02:54 420阅读 0赞

在学习完Spring框架之后, 我们知道了 Spring容器, IOC, AOP, 事务管理, SpringMVC 这些Spring的核心内容, 也知道了它们底层实现的基本原理, 比如Spring容器就是个Map映射, IOC底层就是反射机制, AOP底层是动态代理, SpringMVC不就是对Servlet进行了下封装嘛! 哈哈, 当然这些只是些皮毛, Spring除此之外还有更加复杂的设计, 但我们完全可以抛弃那些复杂的设计, 通过这些底层原理自己来写个Spring框架. 写完之后, 相信我们会对Spring框架有个更加深刻的理解.

### 前置知识 ###

在自己动手写Spring框架之前, 我们得先了解下Spring框架的核心知识点, 如下:

[Spring基础][Spring]

[Spring AOP][]

[Spring事务管理][Spring 1]

[Spring MVC][]

[Java反射机制][Java]

[动态代理][Link 1]

[Java注解][Java 1]

### 代码下载 ###

在开始动手写博客之前, 我已经完成了自己的Spring框架, 并给它取名为 handwritten-mvc-framwork, GitHub地址为:  
[https://github.com/tyshawnlee/handwritten-mvc.git][https_github.com_tyshawnlee_handwritten-mvc.git]

大家可以 clone 到自己的IDE中, 然后跟着下面的博客我们一起学习.

项目导入后结构如下:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdGlhbnhpYW5nX2thb2xh_size_16_color_FFFFFF_t_70]

其中, handwritten-mvc-framwork 为自己实现的Spring框架, handwritten-mvc-example 为该框架的实例.

### 开始 ###

(1) 建立框架

我们首先创建一个Maven项目, 取名为 handwritten-mvc-framwork, 我们尽可能少的使用第三方依赖, 精简后的依赖如下:

<dependencies>
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
            <scope>runtime</scope>
        </dependency>
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.33</version>
            <scope>runtime</scope>
        </dependency>
        
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.0.1</version>
        </dependency>
        
        <dependency>
            <groupId>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.6</version>
        </dependency>
        
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.7</version>
        </dependency>
        
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.2.2</version>
        </dependency>
        
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.3.2</version>
        </dependency>
        
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.0</version>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.49</version>
        </dependency>
    </dependencies>

(2) 实现Spring容器和IOC

[手写Spring框架之IOC][Spring_IOC]

(3) 实现Spring MVC

[手写Spring框架之MVC][Spring_MVC]

(4) 实现Spring AOP和事务管理

[手写Spring框架之AOP][Spring_AOP]

[Spring]: https://blog.csdn.net/litianxiang_kaola/article/details/79121561
[Spring AOP]: https://blog.csdn.net/litianxiang_kaola/article/details/79123698
[Spring 1]: https://blog.csdn.net/litianxiang_kaola/article/details/79371255
[Spring MVC]: https://blog.csdn.net/litianxiang_kaola/article/details/79169148
[Java]: https://blog.csdn.net/litianxiang_kaola/article/details/78634822
[Link 1]: https://blog.csdn.net/litianxiang_kaola/article/details/85335700
[Java 1]: https://blog.csdn.net/litianxiang_kaola/article/details/85161440
[https_github.com_tyshawnlee_handwritten-mvc.git]: https://github.com/tyshawnlee/handwritten-mvc.git
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdGlhbnhpYW5nX2thb2xh_size_16_color_FFFFFF_t_70]: /images/20220322/0c8536de005846f6a0773ecc29c74d5e.png
[Spring_IOC]: https://blog.csdn.net/litianxiang_kaola/article/details/86647022
[Spring_MVC]: https://blog.csdn.net/litianxiang_kaola/article/details/86647040
[Spring_AOP]: https://blog.csdn.net/litianxiang_kaola/article/details/86647057