docker java web application example

Publicado em: 04 Dezembro 2024
no canal de: CodeLink
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certainly! in this tutorial, we will create a simple java web application using spring boot, package it in a docker container, and run it. here are the steps we will follow:

1. *set up the java web application*
2. *create a dockerfile*
3. *build the docker image*
4. *run the docker container*
5. *access the application*

step 1: set up the java web application

we'll create a simple spring boot application that responds with "hello, docker!".

1.1 create the project structure

create a directory for your project:



1.2 create a spring boot application

you can use the spring initializr to bootstrap a new spring boot project. go to [spring initializr](https://start.spring.io/) and select:

project: maven project
language: java
spring boot: 2.5.4 (or the latest stable version)
dependencies: spring web

download the project and extract it into your `docker-java-webapp` directory. your project structure should look like this:



1.3 create a simple controller

create a new file `hellocontroller.java` in the `com.example.demo` package:



step 2: create a dockerfile

in the root of your project (where `pom.xml` is located), create a file named `dockerfile` and add the following content:



step 3: build the docker image

open a terminal in the root directory of your project and run the following command to build the docker image. replace `your-image-name` with a name you prefer.



step 4: run the docker container

once the image is built, you can run it with the following command:



this command maps port `8080` of your host to port `8080` of the docker container.

step 5: access the application

open your web browser and go to `http://localhost:8080`. you should see the message:



summary

in this tutorial, we created a simple java web application using spring boot, packaged it into a docker container, and ran it. here's a summary of the key files and commands:

**dockerfile**: defines how to build the docker image.
**hellocontroller. ...

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