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Start by changing the packaging method in POM.xml to WAR.

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Methods a

1. Add the servlet API

2. Remove tomcat from SpringBoot

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3. A new class and inherit SpringBootServletInitializer

The demoApplication. class in the red box is a self-starting class.

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Way 2

1. Add the servlet API

2. Remove tomcat from SpringBoot (in a different way)

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3. A new class and inheritance SpringBootServletInitializer (another way)

The demoApplication.class in the red box is itself.

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Package into a WAR package

You can use the maven command MVN clean package

You can also use software packaging, such as right-click the project in Eclipse and select Export… , the following figure

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