[Key mastery] Detailed explanation of Javaweb core technology based on Java

It is said that once entering Java, it is as deep as the sea, and since then the code is a lover, but the learning process has never been easy.

At present, more and more Internet companies, when recruiting Java engineers, clearly write that they need to be proficient in JavaWeb technology . As an important part of connecting the front and back ends, JavaWeb technology has become a crucial hurdle for programmers to move forward.

However, after shopping around, I found that JavaWeb, the "torturing little goblin", is too painful to learn!

Many students said that I hate JavaWeb, the basics are not well laid, I am on the verge of collapse after learning all night, and I hope that there is no computer in heaven↓↓↓

Is JavaWeb really so difficult to master?

At present, there are many tutorials on JavaWeb technology on the market, but after reading some, we found that many courses are full of nonsense and lack of focus, and it is quite difficult for everyone to learn.

Moreover, some courses focus on the basic knowledge of JavaWeb, and many students cannot understand real enterprise-level development after reading it.

How to learn Javaweb?

Java web is a technology synthesis that uses Java technology to solve related web and Internet fields. Web includes: web server and web client. The application of Java on the client side has Java applet, but it is rarely used. The application of Java on the server side is very rich, such as Servlet, JSP and third-party frameworks and so on. Java technology has injected a powerful impetus into the development of the Web field.

Three components of JavaWeb:

Server-side program written in Servlet Java

The main function of Servlet is to browse and modify data interactively and generate dynamic Web content.

The process is:

1. The client sends a request to the server;

2. The server sends the request information to the Servlet;

3. The Servlet generates the response content and passes it to the server. The response content is dynamically generated, usually depending on the client's request;

4. The server returns the response to the client.

Accept request corresponding data

Filter Filter is not a servlet, it cannot generate a response, it can preprocess the request before it reaches the servlet, and it can also process the response when the response leaves the servlet.

JavaWeb learning route:

One: Introductory stage

Learning objectives: Familiar with java programmers (rukeng)

1. Understand JDK, JVM, JRE, install IDEA

2. Java Basic Grammar

3. Understand the concepts of classes and objects, inheritance, encapsulation, polymorphism, abstraction, interfaces, inner classes, packages, threads, autoboxing and unboxing, etc.

4.java core programming, file operation, stream processing, multi-thread operation, serialization and deserialization, exception handling

5. The underlying principles of the framework, reflection mechanism, annotations, generics, configuration file parsing design patterns

6. Basic grammar knowledge of JDBC and database: JDBC specification, MySQL, Oracle, SQL Server, JDBC encapsulation, transaction management

Memorize API, very familiar with packages: io, lang (core package), until, sql, servlet; thread, exception, reflection, generic

Two: Improve stage

Learning objectives: java junior software engineer

7. Front-end basics: HTML, CSS, JavaScript, jQuery, AJAX

8. Front frame: MUI, LaYui

9. Data Binding: Vue.js

Three: Strengthening stage

Learning Objectives: Java Intermediate Software Engineer

10. Three major components of javaweb: Servlet, Filter, Listener, and JSP dynamic pages

11. Framework: Spring framework, SpringMVC framework, MyBatista framework, Spring Boot

Four: advanced stage

Learning objectives: java senior software engineer

12. Java Web Enterprise Development Technology

13. Java Web Distributed Development Technology

14. Java Web open source technology and framework

Five: Advanced stage

Learning Objectives: Java System Architect