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REST Servlets and data from a form

Angus Ferguson

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posted 9 years ago

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Hi,

I have a web service with a button and some checkboxes, the user tick a checkbos and the option is send to the controller like in Servlets but I am not using MVC but REST.

The controller should get the data from the form. I am confused

Any idea, please?

Regards, Isaac

William Brogden

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posted 9 years ago

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You appear to be seriously confused about MVC and REST - these are not incompatible.

REST is an architectural style related to the way HTTP methods (GET, POST, DELETE, etc) are used in relation to resources exposed by a web service.

MVC - Model View Controller - architecture refers to the organization of components within the web service - there is an elegant relationship between MVC and REST.

Model - clearly the resource you are exposing has a data model.
View - one of the cool things about REST is that it makes it easy to think about different views of a resource - you might have a plain text view, a graphic view, an audio stream view, etc etc etc
Controller - a REST front end decides which Model and View to use based on the information in the request.

Bill

Angus Ferguson

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posted 9 years ago

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I have this code in a test package:

package test; //Esta es la estructura de paquete creada

import javax.ws.rs.*; //Importamos la librería para manejar RESTful

@Path("getMessage/{type}") //Especificamos una ruta que se debe usar para invocar este método y un parámetro (tipo)
public class WebService
{
    @GET  //Indicamos que este método se ejecutará al recibir una petición por get
    @Produces({"text/plain", "text/html","text/xml", "application/json"}) //Indicamos que el tipo de salida es texto plano, XML, HTML o JSON
    public String mostrarMensaje(@PathParam("type") String tipo)//Método que recibe como parametro el valor de type en la URL
	{
		if(tipo.equalsIgnoreCase("texto"))
		{
			return "Éste es mi primer servicio RESTful con Java";
		}
		else if (tipo.equalsIgnoreCase("html"))
		{
			return "<html lang='es'><head><meta charset='UTF-8'/><title>WS</title></head><body><h1>Éste es mi primer servicio RESTful con Java</h1></body></html>";
		}
		else if(tipo.equalsIgnoreCase("xml"))
		{
			return "<?xml version='1.0' encoding='UTF-8'?><root><value>Éste es mi primer servicio RESTful con Java</value></root>";
		}
		else if(tipo.equalsIgnoreCase("json"))
		{
			return "{\"root\":{\"value\":\"Éste es mi primer servicio RESTful con Java\"}}";
		}
		else
		{
			return "Tipo no soportado";
		}
    }
}

the WEB-INF folder contains web.xml

When I type in the browser:

I get this error:

The name of the app is leanRouteWS and the name of the WS is WebService.

In the example I got from the internet it was like this:

Any idea, please?

Angus Ferguson

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posted 9 years ago

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I tried some variations but definitely there is something I am missing. Any idea, please?

William Brogden

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Posts: 13078

posted 9 years ago

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404 means the servlet container can not find the servlet.

At this point we usually ask for your complete directory layout for this application.

Bill

Angus Ferguson

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Ok maybe a link to Git could help? leanRouteWS

Any idea, please?

William Brogden

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posted 9 years ago

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404 means the servlet container can not find the servlet.

The most likely reasons - either:
1. the servlet container does not recognize your directory as containing a web application
2. the servlet container can not find a servlet corresponding to your web.xml and url addressing.

If this was my problem I would first see if the server could find a plain HTML page in your web application directory.

Note that your Java code has nothing to do with your 404 error, something is wrong elsewhere.

Bill