Small-spring code contributor for 3 months, dare to say proficient in Spring, share my summary!

Author: Xiao Fu Ge
Blog: https://bugstack.cn

Precipitate, share, and grow, so that you and others can gain something! 😄

1. Why write Spring by hand

This Spring, who gets along with our farmers day and night, is like a daughter-in-law sleeping next to you. You know you want to find her for food, drink, pocket money, and skin. But you don't know how much grain she has in her warehouse, or whether she bought it for financial management or deposited it in the bank. Just kidding, I'm going to be serious next!

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Why Spring is used every day, but it is so difficult to read the source code! Because Java and J2EE development experts Rod Johnson in 2002 and subsequently created the Spring framework, with the development of the JDK version and market needs, it has grown so far!

When you read its source code you will feel:

1. ? It’s not as simple as writing code by yourself. 1611479a9b9fb2
2. Why so many interfaces and interface inheritance, class B inherited by class A also implements interface X implemented by class A
3. Simple factory, factory method, agent mode, observer mode, how to use it, there will be so many design patterns used
4. It is resource loading, application context, IOC, AOP, and the life cycle of Bean. Where does the piece of code start?

If it is only fragmented and fragmented Spring knowledge, it is difficult for you to draw a complete Spring Bean object life cycle! understand the life cycle of Spring Bean, how thorough; 1611479a9ba0a6 knows the scanning load object, defines the BeanDefintion, property placeholder, BeanFacePost before the BeanFacePost object is instantiated Provides mechanisms for modifying BeanDefintion properties, Bean object JDK and Cglib instantiation, Aware awareness interface, BeanPostProcessor pre- and post-processing during object initialization, object scope, virtual machine registration hooks, etc. Wait, I put them in a picture, as follows:

The information I have compiled is for the purpose of learning the Spring source code, and understand the core principles of small-spring In the process of handwriting, the Spring source code will be simplified, the core logic in the overall framework will be extracted, the code implementation process will be simplified, and the core functions will be retained, such as: IOC, AOP, Bean life cycle, context, scope, resource processing and other content implementation.

2. 📚Download the PDF I compiled

It took 3 months to compile and write a complete set of simplified Spring source code. At the same time, I wrote an article corresponding to each implementation step, introducing design ideas, implementation process and knowledge expansion. I hope that such information can also be used. help you become a "proficient" in Spring, at least after reading it, you can read the Spring source code less laboriously!

small-spring：https://github.com/fuzhengwei/small-spring
<br/> Reader Communication : During the learning process, if you encounter any problems, please submit an issue

Hello, world of spring! Hello, spring world!

Welcome here, I am glad you can get this book. If you can persist in reading the content of each chapter in the book, it will not only help you in your job interview, but also allow you to have a more in-depth study of Spring core technologies.

The purpose of this repository is to learn the Spring source code, and learn about the core principles of Spring by handwriting a simplified version of the Spring framework.

In the process of handwriting, the Spring source code will be simplified, the core logic in the overall framework will be extracted, the code implementation process will be simplified, and the core functions will be retained, such as: IOC, AOP, Bean life cycle, context, scope, resource processing and other content implementation.

brother , the reason why I started to use the Spring source code is mainly because when writing "Mianjing Manual" , the Spring source code involved will write a lot of text descriptions, draw lengthy flowcharts, and do a lot of work. However, it is still very difficult for newcomers to learn this part of the content directly, so now in order for me and more partners to have a learning , let's study together what is a happy planet!

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1. This column is for actual coding materials. In the process of learning, you need to combine the target to be solved in each chapter in the article, and the idea of design and bring it into the coding practice process. While learning to code, it is also best to understand why this part of the content is implemented in this way, what design patterns it uses, and what methods are used to achieve separation of duties. Only through such learning can you better understand and master the implementation process of Spring source code, and it can also help you lay a solid foundation in the process of in-depth study and practical application in the future.
2. In addition, the study of the content of this column combines the design pattern , which corresponds to the SpringBoot middleware design and development , so if the reader encounters a design pattern that he does not understand during the learning process, he can read the corresponding information. After Spring, you can also practice with the content of the middleware.
3. source code : The source code involved in this column has been integrated into the current project, and can be matched with the corresponding case source code in the chapter one by one. You can run the entire project directly, or you can open and run the source code project corresponding to each chapter separately.
4. If you encounter any problems in the process of learning, including: inability to run, optimization comments, text errors, etc., you can submit an issue, or contact the author: Xiao Fu’s WeChat, fustack
5. In the content of the column, each chapter provides clear design drawings and corresponding class diagrams, so in the learning process, you must not just care about how the code is written, and more importantly, understand how the content of these designs comes from of.

Third, the book catalog

📚 Code Repository : https://github.com/fuzhengwei/small-spring

Container: IOC

• Chapter 01: Introduction
• Chapter 02: Creating a Simple Bean Container
• Chapter 03: Implementing the definition, registration, and acquisition of Bean
• Chapter 04: Object Instantiation Strategies
• Chapter 05: Injecting Properties and Dependent Objects
• Chapter 06: Resource Loader Parses File Registration Object
• Chapter 07: Application Context
• Chapter 08: Initialization and Destruction Methods
• Chapter 09: Aware aware container objects
• Chapter 10: Object Scope and FactoryBean
• Chapter 11: Container Events and Event Listeners

Agency articles: AOP

• Chapter 12: Implementation of AOP Aspects Based on JDK and CGlib
• Chapter 13: Extending AOP to Bean Life Cycle
• Chapter 14: Automatically Scan Bean Object Registration
• Chapter 15: Injecting attribute information through annotations
• [PDF Exclusive] Chapter 16: Setting Attribute Injection for Proxy Object

Advanced: Design

• [PDF Exclusive] Chapter 17: Three-level cache handling circular dependencies
• [PDF Exclusive] Chapter 18: Data Type Conversion

Four, 🎉 end

world, the sensual dog "code". There is enthusiasm, hidden in commonplace!

19.8, 20.8, 21.8, all of them are counted. Xiao Fu has been on this road for more than two years. From there is no fan base, has no writing experience, has no technical article precipitation, and of course no operational skills. Step by step, I met the support of many fan partners, the care of the host friends, and the help of platform operation, and it slowly grew into a stubborn technical tree!

Over the past two years, I have written 8 topics, 22 categories, and 255+ articles! And on , April 23, 2021, Book Festival, my first technical book "Relearn Java Design Patterns" published. Not long after, I have experienced books rushing to the top of the sales list, seeing my technical books in the library, being bought by foreign fan partners and taking them abroad, and seeing a girl bought as a gift to his boyfriend. I also saw the information on Baidu Encyclopedia and my book soon, and I was really happy, but not swelling !

I also wish everyone, you can keep going on your own way, and the long-term precipitation is bound to reap the fruits of the journey you want.