How to integrate Java code with Javascript?

Question

//retorna o usuário logado no sistema
public class ContextObject {

    public static Usuario getUsuario() {
        ContextObject contextObject = ContextFactory.getContextObject();
        return contextObject.usuario;
    }    

}

//mostra em uma função alert() o usuário logado
<script> alert(ContextObject.getUsuario()); </script>

Since these two codes are in different files.

I’m doing this but it’s not right, how should I do it? I need to take the return of java code and show what is coming in the function alert javascript.

Answer 1

Initially you should have a method that returns a json with the desired data, can be in the same class.

But it would involve a REST configuration that I won’t quote here, but you can find in this link and here.

The method you write down your method with @GET and @Produces("application/json") and the class with the annotation @Path("/caminho"). You should also note your user class with @XmlRootElement.

In your javascript you can call the method via HTTP GET. Something like that:

$(function () {
    $.getJSON("/caminho", function(data) {
        alert(data.nome);
    });
});