calling java class from javascript example
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to call a java class from javascript, you typically need to run the java code in an environment where it can be accessed by javascript. this can be achieved in several ways, including using a web server, a javascript runtime like node.js, or a browser environment with java applets (though applets are largely deprecated).
in this tutorial, i will demonstrate a method using *java with a web server* (like a spring boot application) that exposes a rest api, and *javascript* running in the browser (or any http client) that consumes this api.
overview
1. **create a java class**: this class will contain the logic you want to call.
2. **expose a rest api using spring boot**: this will allow javascript to interact with the java class.
3. **write javascript code**: this will call the rest api and handle the response.
step 1: create a java class
first, create a simple java class that performs some operations. for example, let’s create a `calculator` class.
step 2: expose a rest api using spring boot
next, set up a spring boot application. you can use spring initializr (https://start.spring.io/) to generate a basic spring boot application with dependencies for web.
example controller
create a controller that will use the `calculator` class.
application configuration
ensure you have the spring boot application class:
maven dependencies
ensure you have the necessary dependencies in your `pom.xml`:
step 3: write javascript code
now, you can write javascript code to call the rest api. you can use `fetch` or any http client library (like axios) in your javascript code.
example javascript code
here’s an example using the fetch api:
step 4: running the application
1. start your spring boot application. you can run it from your ide or use the command line with `mvn spring-boot:run`.
2. open the html file in a web browser.
3. enter two numbers and click the "add" button. it will call the java method via the rest api and display the result.
con ...
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