foreword
Everyone knows that Github is a programmer's paradise, where there are all kinds of powerful open source frameworks, software or tutorials. These things have made great progress for our learning and progress, so we have sorted out the technical documents of the seven great Java open source projects on Github for everyone to learn! ! !
Due to space limitations, friends who need it can privately message me [Java]~
In-depth understanding of Spring Cloud and microservice construction
-
From simple to deep, comprehensively explain the basic components of Spring Cloud.
-
One-stop understanding of building microservices with Spring Cloud, practical cases, and quick start.
-
Explain Spring Security OAuth2 in detail to escort the security of the microservice system.
This article is divided into 16 chapters, the main contents of each chapter are as follows:
Chapter 1 introduces what microservices are, why they are needed, the pros, cons, and challenges of microservices, and compares monolithic systems with microservices-architecture systems.
Chapter 2 mainly introduces the functions that microservices should have, as well as the basic components of SpringCloud, and finally introduces the comparison and advantages and disadvantages between SpringCloud, Dubbo and Kubernetes.
Chapters 3 and 4 describe the preparations for building microservices: the construction of the development environment and the use of Spring Boot. in,
Chapter 3 introduces the construction of the development environment, including the installation of JDK, the use of IDEA and Maven, etc.; Chapter 4 introduces the basic usage of Spring Boot, including the features and advantages of Spring Boot, creating a Spring Boot project with IDEA, Spring Boot configuration file details, Spring Boot's Actuator module, and Spring Boot's integration of JPA, Redis, Swagger2, etc.
Chapters 5 to 9 introduce the basic module of the Spring Cloud framework, the Spring Cloud Netflix module, which covers the basic components of Spring Cloud to build microservices. For example, Eureka, Ribbon, Feign, Hystrix, and Zuul, etc., these components provide basic service governance capabilities for microservice systems. Taking the case as the starting point, these components are introduced from shallow to deep, and the working principle of these components is analyzed from the perspective of source code.
Chapter 10 introduces Spring Cloud Config, a distributed configuration center, and explains in detail how Config Server reads configuration files from local repositories and remote Git repositories, as well as how to build a highly available distributed configuration center and refresh configuration files using a message bus.
Chapter 11 introduces the link tracking component SpringCloudSleuth, including why the microservice system needs the link tracking component, and introduces in detail how to use the link tracking in the SpringCloud microservice system in the form of a case, and how to transmit, store and display the chain road data.
Chapter 12 introduces Spring Boot Admin in the form of cases, including the application of Spring Boot Admin in microservice systems and the integration of secure login components in Spring Boot Admin.
Chapters 13 to 15 introduce the security authentication modules of the Spring Cloud microservice system, including Spring Boot Security components and Spring Cloud OAuth2 modules. Chapter 13 describes in detail how to use Spring Boot Security in Spring Boot applications; Chapter 14 describes how to use Spring Cloud OAuth2 in the Spring Cloud microservice system to protect the system security of microservices; Chapter 15 describes how to use Spring Cloud Spring CloudOAuth2 and JWT are used in the microservice system to protect the system security of microservices.
Chapter 16 introduces the whole process of using Spring Cloud to build a microservice system with a comprehensive case, which is a summary and refinement of the content of the book.
Big Data Algorithms
Big data algorithm is the basis for the effective application of big data, and it is also a must-learn course for those who are interested in working in big data and related fields. This paper is written by experts engaged in big data research, and systematically introduces the theory, method and technology of big data algorithm design and analysis.
This paper is divided into 10 chapters. Chapter 1 provides an overview of big data algorithms, Chapter 2 introduces time sublinear algorithms, Chapter 3 introduces spatial sublinear algorithms, Chapter 4 outlines external memory algorithms, and Chapter 5 introduces big data external memory search. Structure, Chapter 6 teaches out-of-memory graph data algorithms, Chapter 7 provides an overview of the MapReduce algorithm, Chapter 8 teaches the MapReduce algorithm through a series of examples, Chapter 9 introduces algorithm design methods beyond MapReduce, and Chapter 10 discusses crowdsourcing algorithms.
"Java core technology and interview guide"
This article provides a path for junior programmers with zero foundation in Java and less than 3 years of development experience to upgrade to senior engineers according to the general standards of most software companies for advanced development, and is guided by project development and trial, accurately Describe the essential skill points for leveling up
Specifically, this article focuses on the common technical points of the project, and reorganizes the basic grammar points, object-oriented, ideas, collection objects, exception handling, database operations, JDBC 10 operations, reflection and multi-threading knowledge points.
In addition, this article also mentions "design patterns" and "knowledge points of virtual machine memory tuning" that are very helpful to project development. In this part, although you can't see purely theoretical descriptions, you can see a lot of practical Operational dry goods.
The author has more than ten years of software development experience and more than 5 years of technical interview experience, and knows the general needs of enterprises in Java. At the same time, the author has more than 6 years of training experience, helping the zero-based students and junior programmers to upgrade to advanced development in more than half a year, so I dare to point out the advanced path of learning and interviewing for everyone.
This article will not only describe the application skills of various common knowledge points in the project, but also tell you how to demonstrate this ability in interviews. In addition, for some more "valuable" technologies (often used by junior programmers but In the interview, I do not know how to describe the technology, such as design patterns and virtual machines), the author will not only tell you the relevant rhetoric, but also tell you the skills of "introducing this topic without the interviewer mentioning it". , also from the perspective of the interviewer, describes various skills in the entire interview process such as writing and sending resumes, preparing for interviews, describing project experience, and negotiating salary.
Chapter 1 takes you into the world of Java
Starting from meeting the employment standards of enterprises, Java knowledge points can be divided into two parts: Java Core Development (JavaCore) and Java Network Development (Java Web). This article mainly focuses on the former. The purpose of this article is to let everyone master the necessary knowledge system for advanced Java development programmers as soon as possible, and avoid detours. Therefore, this chapter not only shows you the general steps of developing and debugging Java through examples, but also gives you an advanced learning path for learning Java. In order to help everyone complete the improvement of ability in a short time.
Chapter 2 Intensive Introduction to Common Technical Points in Basic Grammar
This chapter only introduces the basic usage commonly used in the project and some details that are easily overlooked, and will list some problems that most beginners will encounter to warn everyone.
In addition, this chapter will combine some cases to show you the main points of using object-oriented ideas, so that you can understand and use this idea from the application level, rather than just staying at the theoretical level.
Chapter 3 Collection Classes and Common Data Structures
If data structures describe the way data is stored and organized in an abstract form, then Java collection classes are tangible containers that can store business data in different kinds of formats.
Java's collection class is definitely used by programmers. During the interview, the interviewer will definitely ask this question, and whether the knowledge points of the collection part can be reasonably applied is directly related to performance optimization.
In addition, generics are an integral element in collection classes, and this chapter will cover not only the common syntax of generics, but also generic wildcards and generic inheritance.
Chapter 4 Exception Handling and I0 Operations
An exception is not a syntax error, it is not caused by the programmer's negligence, but a set of protection mechanisms. If there is a problem with the environment in which the code runs, such as the database server is broken, this protection mechanism can capture exceptions in the running environment and make reasonable exception handling actions.
In Java programming, exception handling is commonly used in I0 programming, database programming, etc., so this chapter also describes the knowledge points of Java 10 programming. On the one hand, you can further understand the common usage of exception handling skills in projects through I0 operations; on the other hand, through some cases, you can understand common read and write operations.
Chapter 5 SQLJDBC and Database Programming
The vast majority of projects will use databases. The importance of this knowledge point is self-evident, and it will definitely be asked during interviews.
For advanced programmers, in terms of SQL statements, not only should they be able to write simple addition, deletion, modification and query statements, but also use some relatively complex statements to achieve various requirements in the project. In terms of JDBC programming, it is not only necessary to perform basic addition, deletion, modification, and query operations, but also to understand advanced knowledge points such as batch processing and transactions. More importantly, senior programmers must also have certain database tuning capabilities, otherwise the upgrade cannot be completed.
In response to the above requirements for advanced programmers, this chapter will first tell you which styles of SQL may be used in the project; secondly, it will describe some advanced knowledge points based on the basic JDBC syntax; finally, it will describe as much as possible. -Some tuning knowledge points that everyone can accept at present.
Chapter 6 Reflection Mechanisms and Proxy Patterns
In commercial projects, there are not many usage scenarios for the reflection mechanism. Some (here can say most) senior programmers with 3 years of work experience may not have written reflection-related code in the project.
From the perspective of senior programmers (or more senior architects), they can "conditioned reflex" to think of two related advanced knowledge points when they see the reflection mechanism. One is the proxy mode, which is a common 23 types One is the design pattern, which can improve the system structure well; the other is the core code of Spring I00. It can be said that the reflection mechanism is an important cornerstone of Spring's "dependency injection" and "aspect-oriented programming" features.
Therefore, the reflection mechanism is an "important infrastructure" in Java. When you are used to the services it provides, you can't feel its existence, but - without this mechanism, many things (at least Spring) will Can't do it. This chapter will not only describe common uses of reflection, but will also show you how it works in a proxy pattern application point.
Chapter 7 Multithreading and Concurrent Programming
The advantage of multithreading lies in concurrent operations. For example, in a website project, if there are multiple users, a thread can be started for each user to provide services. The difficulty of multi-threaded development also lies in concurrency control. For example, after starting multiple threads, it is necessary not only to avoid the deadlock problem caused by waiting for each other between threads, but also to avoid the simultaneous operation of a critical resource (such as an account object by multiple threads) ) resulting in data inconsistency.
At present, most companies (especially Internet companies) will use Java to develop Web projects, and the concurrency issues must be considered, so multithreading often appears in many company interviews.
In this regard, first of all, you must understand basic knowledge points, such as how to create threads or the basic usage of threads; secondly, you must master advanced knowledge points such as thread safety, locks, and semaphores.
Last but not least, you must master the skills of how to correctly read and write critical resources when threads operate concurrently, so as to ensure the accuracy of data.
Chapter 8 Making Design Patterns Really Help You
When we develop a project, we will encounter a lot of problems, which can be confusing, but if we look at these problems in the abstract, these "infinite" problems can be reduced to "finite" types, such as "how to create a singleton object" or "how to access other resources through proxies".
In response to these "limited types" problems, the four "big cows" (GoF) proposed 23 design patterns. In each pattern, not only the applicable scenarios of this pattern are given, but also the proposed Solutions to this type of problem, which is why design patterns are so popular.
In most projects, a reasonable application of these 23 patterns can solve the vast majority of problems (not all problems).
When encountering problems that they cannot solve, we can also flexibly use the design principles (such as the single responsibility principle or the Liskov substitution principle) contained behind the design pattern to analyze and solve the problem.
Chapter 9 Virtual Machine Memory Optimization Tips
The virtual machine is the running platform of the Java program. By understanding the architecture of the virtual machine, you can understand the execution flow of Java. Understanding is not the purpose, the purpose is to let everyone master some "optimization" skills that are directly helpful to the usual development.
But the reality is far from optimistic. According to the current training and interview experience, programmers with less than 3 years of work experience basically do not have "optimization" skills (some people don't even know they have such skills). As a result, the code they write often consumes more memory, and even has serious problems that cause the system to crash due to "memory overflow".
According to this situation, this chapter will talk more about actual combat experience, so that you can not only understand the basic knowledge of virtual machines and memory management, but also know how to analyze and locate memory performance problems, and on this basis, you can master how to optimize memory performance. method. Most helpfully, this chapter will also show you how to demonstrate memory optimization skills in interviews.
Since most junior programmers don't have a good grasp of this part of the knowledge, once you have a good grasp of these very important (because it is related to performance, so very important) optimization skills, then your success rate of applying for a job can be greatly improved promote.
Chapter 10 Finding Good Jobs with Resumes and Interviews
Knowing each other and knowing oneself, one win and one loss, this sentence can well reflect the current situation of most programmers submitting resumes to find jobs. At present, many relatively junior candidates basically get interviews and even job-hopping opportunities through widely distributing their resumes. However, this practice of not knowing the key points of interviews and not analyzing the company's specific recruitment needs will not only reduce the probability of finding a good job, but will also increase the chances of finding a good job. Let everyone miss some favorite companies, so that they can only "make do" into a general company that can meet their salary requirements.
The recruitment company will first screen out a batch of candidates with insufficient academic qualifications and other hard conditions through the resume, and then focus on the number of years of work and project experience related to the position. Unless it's on campus, companies are looking for experienced employees. That is to say, having relevant project experience is an important condition for getting interview opportunities, and only these candidates have the opportunity to be asked about technical algorithm projects or even intelligence-related questions.
This chapter first introduces the skills of getting an interview opportunity through a resume, and then shows some skills in the interview to prove that you are suitable for the position you are applying for without leaving a trace. As for the specific technical problems of Java Core, Java Web, databases and algorithms, everyone can collect them by themselves, and in the appendix of this book, I have sorted out as many questions and answers as possible.
Docker in action
This article is divided into 3 parts.
Part 1 introduces the characteristics of Docker and containers. Helps you understand how to install and uninstall software published in Docker. You will learn how to run, manage, and connect different types of software in different container structures. The first part introduces the basic skills every Docker user needs. Part I (Chapters 1 to 6) focuses on resource isolation and permission control and basic principles of Docker containers.
Part 2 introduces Docker packaging and software distribution, covering the underlying mechanics of Docker images of different sizes, as well as a survey of different packaging and distribution methods. This section also includes an in-depth analysis of the Docker Distribution project. Part 2 (Chapters 7-10) explains in detail how to package and build images and the construction of various image distribution infrastructures.
Part 3 introduces multi-container projects and multi-host environments, covering Docker Compose, Machine, and Swarm projects. This section guides you through building and deploying multiple real-world instances, approximating the scale of large server software. Part 3 (Chapters 11-12) focuses on the combined operation of Docker containers, that is, the management of multi-container and multi-host environments.
This article is full of pictures and texts, combined with basic principles and specific cases to provide you with many good practical opportunities.
Learn Spring Boot 2 microservice project step by step
This article takes the actual project as the main line, and introduces the Spring Boot 2.0 integration of many popular technologies and various skills in Web application development step by step.
Chapter 1 guides readers to quickly build a Spring Boot development environment from scratch.
Chapters 2, 3, 10, and 13 introduce Spring Boot data access applications, including Spring Boot integration with Druid, Spring Data JPA, and MyBatis, for quick access to MySQL and Mongo DB databases.
Chapters 4 to 6 focus on the Spring Boot integration of the Thymeleaf template engine, transaction usage, and the application of interceptors and listeners. Chapters 7 to 9 mainly introduce Spring Boot using Redis cache and Quartz timer, integrating Log4j logging framework and sending Email.
Chapters 11 and 12 mainly introduce Spring Boot's integration of ActiveMQ and asynchronous calls, and the use of global exceptions.
Chapters 14 and 15 mainly introduce Spring Boot application monitoring and application security.
Chapters 16 and 17 introduce the registration of Spring boot microservices in Zookeeper and the use of Dubbo, multi-environment configuration and use, and deployment of applications on Tomcat. Chapter 18 explores the principles and execution flow behind Spring Boot.
Deep Dive into Java Design Patterns
A design pattern is a set of code design experiences that are reused. This article is aimed at readers who have a certain Java language foundation and certain programming experience.
It aims to cultivate readers' good thinking mode of design mode and strengthen their understanding of object-oriented thinking.
This article is divided into 12 chapters.
Firstly, the importance of interfaces and abstract classes in design patterns is emphasized, and the application of reflection technology in design patterns is introduced.
Then, 10 of the 23 commonly used design patterns are selected and explained in detail, including 2 creational patterns, 4 behavioral patterns, and 4 structural patterns.
This article explains the theory thoroughly and the application examples are in-depth. The explanation of design patterns leads to the topic to be discussed from the analysis of a kind of common things in life, then in-depth analysis of design patterns, and finally application research. All examples in the application exploration part are derived from application projects, covering practical technologies such as Java.JSP, JavaScript, Ajax, etc., and the knowledge covers a wide range.
JAVA core knowledge points finishing
This article is divided into 30 parts, starting from the underlying principles of java, to architecture, microservices, big data, and cloud computing. Call it an encyclopedia! ! !
Overview
If you need
Hope it can help you to learn! ! ! !