An introductory graphic tutorial on SpringBoot in Java

1. What is SpringBoot

In recent years, the concept of microservices has become more and more popular. I believe that when everyone searches for microservices, the first thing that comes into view is SpringBoot and SpringCloud. SpringCloud provides a complete set of microservice solutions, but what is the relationship between SpringBoot and SpringCloud? There’s no point here, SpringBoot can be said to be the foundation of SpringBoot, just like JAVA SE is the only way to advance to JAVA EE. Then we will start with SpringBoot and explore the path of microservices bit by bit. I hope everyone can study together. If there is something wrong with what I wrote, please point it out and lightly complain.

2. Let’s take a simple example

As programmers, everyone is familiar with Hello World, so let’s start my learning journey from Hello World. The poster uses IDEA as a development tool (Amway, IDEA is really easier to use than ECLIPSE).

　You can create a SpringBoot project in two ways. As shown in the red box in the figure below:

In fact, in my opinion, there is no difference between the two construction methods. To talk about the difference, Spring Initiallizr can help you initialize a simple SpringBoot project (simply a benefit for lazy people), and if you use MAVEN to build it, you need to manually add some SpringBoot dependencies. We use Spring Initiallizr to create it (don't ask the poster why, because the poster is lazy).

Next step, fill in some information about MAVEN

Next step, we try to use the latest version of SpringBoot to build, and leave nothing else selected (don’t ask What are the uses of the options on my left, take your time)

Next step, fill in the project name, click Finish after filling in the project name, wait a moment, and wait for the system to be built Finish.

This is a SpringBoot project we initialized, as shown below:

Next we start to write a simple Hello World project, add spring-boot-starter-web dependency so that the project can be accessed via the web.

Write the HelloWorld code:

Then start the project and the project starts successfully as follows:

Open the browser and enter http://localhost:8080/hello. You can see that we have agreed to Hello SpringBoot!

Okay, the first SpringBoot example has been successfully run. After finishing the work, it’s time to sleep. . .

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