CODEWITHSUNDEEP
javarestweb-serviceshttpurlconnection
Daulet Kshibekov
Daulet Kshibekov

Reputation: 181

Java POST request to get token from web service

I need to get access from java application to some RESTful web service which uses token-based authentication. As I understood the best choice for this purpose is to use JAX-RS-based libraries like Jersey, but I am very new to this matter. Maybe someone could help me by giving example code of proper request to get a token from web service.

What we have:

As I understood, to get a token I have to send POST request along with the following headers:

and the following parameter:

grant_type=password&username=someusername&password=somepassword&scope=profile

Hope somebody will help me with example code.

Upvotes: 1

Views: 14071

Answers (2)

Daulet Kshibekov
Daulet Kshibekov

Reputation: 181

Resolved!

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public void getHttpCon() throws Exception{

    String POST_PARAMS = "grant_type=password&username=someusrname&password=somepswd&scope=profile";
    URL obj = new URL("http://someIP/oauth/token");
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();
    con.setRequestMethod("POST");
            con.setRequestProperty("Content-Type", "application/json;odata=verbose");
    con.setRequestProperty("Authorization",
            "Basic Base64_encoded_clientId:clientSecret");
    con.setRequestProperty("Accept",
            "application/x-www-form-urlencoded");

    // For POST only - START
    con.setDoOutput(true);
    OutputStream os = con.getOutputStream();
    os.write(POST_PARAMS.getBytes());
    os.flush();
    os.close();
    // For POST only - END

    int responseCode = con.getResponseCode();
    System.out.println("POST Response Code :: " + responseCode);

    if (responseCode == HttpURLConnection.HTTP_OK) { //success
        BufferedReader in = new BufferedReader(new InputStreamReader(
                con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        // print result
        System.out.println(response.toString());
    } else {
        System.out.println("POST request not worked");
    }
}

Upvotes: 4

albert_nil
albert_nil

Reputation: 1658

Some points:

  • URL request you specify is the one belonging to Resource Owner Password Credentials Grant. Be sure you are under the scenario this grant is meant for (more details here).
  • JAX-RS is about implementing the REST apis, not about the client-side calls (maybe you were talking about "jax-rs client"? if that's the case, in terms of oauth, it falls into my last point category as any other http client).
  • There are libraries that can handle obtaining access token for you, so that you only need to provide properties and decide what to do with the resulting token. For example, if you are ok using spring, Spring Security OAuth2 (talking about the "client role" configuration only; you will be using external authorization server).
  • If those libraries do not fit your case: You only need to implement/use an http client to do standard calls to that authorization server (they are just REST apis). Some options: apache httpcomponents, Spring RestTemplate, jdk HttpUrlConnection

Upvotes: 0

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