Problem trying to request HTTP in Java

Question

I have a problem and would like you to help me solve it. I created a java application to consume a webservice that I made in php. After a lot of searching I managed to create a class capable of making http requests. The problem is that I am encountering an error with the url I am using to access the webservice. The Webclient class is responsible for connecting to the webservice and returning a response (which would be a string in JSON format), it receives the data (also a string in JSON format) and tries to request with the server where the webservice is hosted. However I am encountering a malformation error in the url. Could anyone help me to solve this problem?

Webclient class

public class WebClient {
public String post(String json) {
    try {
        URL url = new URL("localhost/CWS/cadastrar_guia.php");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestProperty("Content-type", "application/json");
        connection.setRequestProperty("Accept", "application/json");


        connection.setDoOutput(true);

        PrintStream output = new PrintStream(connection.getOutputStream());
        output.println(json);

        connection.connect();

        Scanner scanner = new Scanner(connection.getInputStream());
        String resposta = scanner.next();
        return resposta;
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

}

On Main

    String guia = "{\"nome\":\"NomeUsuario\",\"sobrenome\":\"SobrenomeUsuario\",\"cpf\":\"99999999999\",\"email\":\"[email protected]\",\"senha\":\"00000\"}";
    WebClient wc = new WebClient();
    resposta =  wc.post(guia);

    System.out.println(resposta);

Error:

java.net.MalformedURLException: no protocol: localhost//CitourWS//cadastrar_guia.php
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at webservice.WebClient.post(WebClient.java:13)
at Main.main(Main.java:76)

Answer 1

Probably the exception is due to missing parts of your declared URL.

Change:

URL url = new URL("localhost/CWS/cadastrar_guia.php");

For:

URL url = new URL("http://localhost/CWS/cadastrar_guia.php");