Consume values from a webservice

Question

I have no knowledge in the use of webservice, and I need to use one now to consume data from a database(Normally I would fetch the data directly from the database, but in this case the admin did not authorize, said the only way was to provide a webservice).

So I have a page on PHP with various function names:

Example:

Lista_produtos

Doubt: How do I create a customer in JAVA that consumes these values? They can provide some example code?

Edit

Answer 1

First you need to choose which type of Webservice you will create and how you will create.

There is this guide to create Restful webservices and with the use of JAX-WS: http://www.k19.com.br/artigos/criando-um-webservice-restful-em-java/

Also, you can choose to follow this very good guide from the GUJ website: http://www.guj.com.br/articles/132

Or, if you want something fast, you can make a Stateless Session Bean available as a webservice by simply announcing it with the @Webservice tag:

@Stateless  
@WebService  
public class MyWebService {  
   public double sum(double a, double b) {  
       return a + b;  
   }  
}  

More details here: http://docs.oracle.com/javaee/5/tutorial/doc/bnbor.html

Answer 2

First you should read the wsdl created by the webservice and create an interface in your project that has access to the methods you need. For this you need (at least in this case) apache cxf. Simply use the command

[caminho]\apache-cxf-2.2.7\bin>wsdl2java -p [pacote que será criado] -d "[caminho onde será criado o pacote]" [seuWebservice?wsdl] 

if you have xml on your machine you can replace the url with the xml path

after that the method call is the same as any other interface call, follow an example (here the webservice has a method called query PorId that will be consumed by the method returning a company)

  public Empresa consultarEmpresaPorId(Long id) {
    ConsultarEmpresaPorIdRequest request = new ConsultarEmpresaPorIdRequest();
    request.setIdEmpresa(id.intValue());
    ConsultarEmpresaPorIdResponse response = WEBSERVICE.consultarEmpresaPorId(request);
    if (response.getResultCode() == 100) {
        return response.getEmpresa();
    }

Answer 3

It looks pretty simple. I found the code below in this link here.

URL url = new URL("http://argentumws.caelum.com.br/negociacoes");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
InputStream content = connection.getInputStream();
List<Negociacao> negociacoes = new LeitorXML().carrega(content);

Answer 4

You can use the command wsimport that comes in JDK itself.

Open the cmd or terminal and type wsimport -d diretorio onde vai colocar os arquivos gerados + endereço do wsdl -Xnocompile.

Here is a more explanatory tutorial on wsimport: http://www.mkyong.com/webservices/jax-ws/jax-ws-wsimport-tool-example/

Here’s a tutorial on what to do after wsimport: http://www.mkyong.com/webservices/jax-ws/jax-ws-hello-world-example/

Hug.