Basic Access Authentication is easy to implement with JAX-RS 2.0 and a ClientRequestFilter realization:

import java.io.IOException; import java.io.UnsupportedEncodingException; import javax.ws.rs.client.ClientRequestContext; import javax.ws.rs.client.ClientRequestFilter; import javax.ws.rs.core.MultivaluedMap; import javax.xml.bind.DatatypeConverter; public class Authenticator implements ClientRequestFilter { private final String user; private final String password; public Authenticator(String user, String password) { this.user = user; this.password = password; } public void filter(ClientRequestContext requestContext) throws IOException { MultivaluedMap<String, Object> headers = requestContext.getHeaders(); final String basicAuthentication = getBasicAuthentication(); headers.add("Authorization", basicAuthentication); } private String getBasicAuthentication() { String token = this.user + ":" + this.password; try { return "BASIC " + DatatypeConverter.printBase64Binary(token.getBytes("UTF-8")); } catch (UnsupportedEncodingException ex) { throw new IllegalStateException("Cannot encode with UTF-8", ex); } } }

A filter instance can be registered during the creation of the client:

import javax.ws.rs.client.Client; import javax.ws.rs.client.ClientBuilder; Client client = ClientBuilder.newClient().register(new Authenticator(user, password)); ... = this.client.target(uri);

…and the authentication becomes transparent…

The code above was borrowed from the https://github.com/AdamBien/e2ftp project.