How to add java startup command to tomcat service

Existing code:

1. Main function: maingame.java (starting function for game startup.)

2. Frame running class: gameenterframe. java (responsible for loop execution, I set it to run every 2 seconds and write data to the database.)

Regarding self-starting, there are two key points:

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

in the web-inf under webroot.

If you don’t have the same path as my picture, unfortunately, it means you created the wrong project type.

Remember to create a new web server project.

Simply add three lines of code to this file to tell tomcat that I want to run an auto-start class. I will name it autorun and that's it. As shown below, the blue part is the code I added.

It’s convenient for everyone to use, just paste it.

<listener> 
<listener-class>game.autorun</listener-class>
</listener>

With this monitoring, you can execute the autorun class under the game package (the game package is a game class package I created myself, you can create the name of the package you like) at runtime. . This autorun class is the self-starting code I wrote.

How to write specifically, see below:

2. How to write the self-starting code:

We need to let the self-starting code lead to the main function. So under the game package, create a new file named autorun.java

package game;
import javax.servlet.servletcontextevent;//这个是自启动要用到的类，服务器后台事件
import javax.servlet.servletcontextlistener;//这个是自启动要用到的类，服务器后台监听
import game.maingame;//我们把主函数导入进来以便于运行
//声明一个autorun类，使用服务器后台监听接口。固定用法，死记硬背
public class autorun implements servletcontextlistener{
//当后台被初始化，即发生了tomcat启动了事件，固定用法
public void contextinitialized(servletcontextevent arg0){
//你要做的事儿，写在这里
system.out.println("mainfunction is running."); 
maingame.main(null);
}
//当后台被销毁，即发生了tomcat关闭了事件，固定用法
public void contextdestroyed(servletcontextevent arg0){
//执行内容写在这里
}
}

You can see that there are two parts in monitoring tomcat startup and shutdown status,

• One What do I want to do if it is enabled?

• The other is what do I want to do if it is closed?

Of course, if it is closed, I don’t need to execute anything yet. action. I just need to execute the main function of the game after startup. So I put the main function in the startup.

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