Ajax Request for Controller Spring

Question

I am developing a system with back-end in Spring (Spring Boot) and front-end with HTML, CSS(Bootstrap) and Javascript(Jquery).

I’m having trouble putting together an ajax request.

Follow the Spring Controller code:

    @RequestMapping(value = "/visualizarResumo", method = RequestMethod.POST, consumes = { MediaType.APPLICATION_JSON_VALUE })
    public @ResponseBody ResumoNFe visualizarResumo(@RequestParam Long empresaId, @RequestParam Long nsu) {
       System.out.println(empresaId);
       System.out.println(nsu);
       return resumoNFeService.buscaPorId(new ResumoPK(empresaId, nsu));
    }

And the requisition:

$('button[name=visualizarResumo]').click(function(e) { 
var buttonVisualizarResumo = $(this);
var nsu = buttonVisualizarResumo.attr('data-nsu');
var empresaId = buttonVisualizarResumo.attr('data-empresa');
console.log(nsu);
console.log(empresaId);

$.ajax({
     url: '/edocs/mde/visualizarResumo',
     method: 'POST',
     contentType: 'application/json',
     data: JSON.stringify({empresaId:empresaId, nsu:nsu}),
     dataType : 'json',
     error: onErrorVisualizarResumo,
     success: onSuccessVisualizarResumo
});

function onErrorVisualizarResumo() {
    console.log(arguments);
}

function onSuccessVisualizarResumo() {
    console.log("sucesso");
}

});

Looking at the Chrome tools, the Request Payload is mounted right with the companyId and nsu. However it is returned me a bad request (400)

Exception : "org.springframework.web.bind.Missingservletrequestparameterexception"

message : "Required Long Parameter 'empresaId' is not present"

Answer 1

The problem is that the parameters are like Requestparam, but the values are going in the body of the request.

So much so that if you give a post on Uri "http://localhost:8080/viewSummary? companyId=10&nsu=10" you will receive them in the controller.

If your interest is really sending in the body of the request, you can do so:

@RequestMapping(value = "/visualizarResumo", method = RequestMethod.POST, consumes = {
        MediaType.APPLICATION_JSON_VALUE })
public @ResponseBody String visualizarResumo(@RequestBody(required = true) Map<String,Object> corpo) {
    System.out.println(corpo);
    return String.format("%7d %7d", corpo.get("empresaId"), corpo.get("nsu"));
}

But if your request does not change any status on the server, you can do a GET even. I don’t know your business rule, but I think you’d be more polite.

I would also say to pass to another layer the request, getting the controller take care of receiving the request, pass to another layer, take the return and return.

Any questions, just ask!