calling java class from javascript example

Publicado em: 03 Dezembro 2024
no canal de: CodeTime

Download 1M+ code from https://codegive.com
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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