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This article introduces the knowledge of "how to start a web project through tomcat source code". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Learning background

In the last wave, we learned the methods and relationships of the main interfaces in tomcat:

Https://www.lixiang.red/articles/2019/08/12/1565622240937.html

In fact, the source code can only be seen by looking at it. If you keep looking at it later, it is easy to get confused. There is a saying that true knowledge comes from practice.

Today, let's start our daily web application through the tomcat source code. In the middle, we can debug, and we can see the whole process better.

Prepare the web application

You can quickly generate a web application in https://start.spring.io/

Then build the project and get the following directory structure:

We open it with ide, add a controller, and pack it into a war package for backup.

Then drop the war package into the webapp directory of tomcat

The configuration of tomcat is imported into the jar package into idea

For ant-related configurations, please refer to this article

Https://www.lixiang.red/articles/2019/08/04/1564907616303.html

After executing the deploy command, we can see the dropped jar package in the tomcat-build-libs directory

Then import these packages into idea

Open the project settings panel first

Click the button to add jar package

Find the corresponding tomcat-build-libs directory, select all the following files, including the ant.jar we downloaded, and finally click OK

Modify some configurations of tomcat itself

Delete the tomcat/webapps/examples directory, which is full of examples, which will report errors in the compilation of the source code and interfere with our normal startup. You can delete them first.

Modify the port number of tomcat (optional) in tomcat/conf/server.xml, just as we usually deploy the application

Start tomcat and trace

As we have talked before, when you start tomcat with a shell script, you start the Bootstrap.java class and follow the parameter start.

So, we need to add start to the startup parameters of idea

Breakpoint: you can start tracking the breakpoint at the entry entry we mentioned earlier, that is, the main function.

Let go of the breakpoint and continue to run for a while, you can see the interface started by spring

Finally, we visit the controller we wrote in the browser, and we can see the corresponding return.

This is the end of the content of "how to start a web project through tomcat source code". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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