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This article mainly introduces how to add java startup commands to tomcat services, which is very detailed and has a certain reference value. Friends who are interested must finish reading it!

My first server program

Recently, I am learning to write online games, so to write server-side programs, I looked for PHP,JAVA,C. Finally, I chose java for good compatibility with Ali Cloud and Tencent Cloud, low cost and low learning difficulty.

Then start to learn how to write the class of java. And how to connect to the database and how to run the code every few seconds. After all, these two together can become the simplest server.

My first program is very simple. After tomcat starts, it runs every 6 seconds to generate a set of random numbers and send them to the mysql database.

Key point: self-starting timing to run write database

As a result of writing the database and timing runs in the previous article has been introduced.

Therefore, this article mainly introduces how to self-start.

Existing code:

1. Main function: mainGame.java (the lead function of the game startup.)

two。 Frame run class: gameEnterFrame.java (responsible for loop execution, I set it to run once every 2 seconds to write numbers to the database. )

There are two key points about self-startup:

1. You need to modify a configuration file named web.xml

In WEB-INF under webRoot.

If you don't have the same path as my picture, it's a pity that your project type has been created wrong.

Remember to new a web server project.

Simply add three lines of code to this file and tell tomcat that I'm going to run a self-starting class, and I'll name it autoRun. As shown in the following figure, the blue part is the code I added.

Convenient for everyone to use, paste it out.

Game.autoRun

With this listener, you can execute the autoRun class under the game package (the game package is a game package I created myself, and you can create the name of your favorite package) at run time. This autoRun class is the self-startup code I wrote.

How to write it, take a look at the following:

two。 How to write the self-startup code:

We need to get the self-startup code to lead to the main function. So under the game package, create a new file named autoRun.java

Package game;import javax.servlet.ServletContextEvent;// this is the class to be used since startup. The server background event import javax.servlet.ServletContextListener;// is the class to be used for self-startup. The server background listens to import game.mainGame;//. We import the main function to run / / declare an autoRun class and use the server background listening interface. Fixed usage, rote memorization public class autoRun implements ServletContextListener {/ / when the background is initialized, the tomcat startup event occurs. The fixed usage public void contextInitialized (ServletContextEvent arg0) {/ / what you need to do, write here System.out.println ("MainFunction is running."); mainGame.main (null);} / / when the background is destroyed, the tomcat shutdown event occurs, and the fixed usage public void contextDestroyed (ServletContextEvent arg0) {/ / execution content is written here}}

As you can see, there are two parts in monitoring the tomcat startup and shutdown state.

One is to start. What am I going to do?

The other is closed. What am I going to do?

Of course, it's off. I don't need to do anything right now. I just need to execute the main function of the game after startup. So I left the main function in the startup.

The above is all the contents of the article "how to add java startup commands to tomcat services". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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