Test.java

import java.io.IOException;

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

public class Test {

    private static final String PROTOCOL = "http";
    private static final int PORT = 4503;
    private static final String HOST = "localhost";
    private static final String COOKIE_NAME = "login-token";

    public static void main(String[] args) throws Exception {
        String username = "admin";
        String password = "admin";
        String specialPath = "/home/users/a/admin.json";

        HttpClient client = new HttpClient();

        String token = getToken(username, password, client);

        if (token == null) {
            System.err.println("No login cookie set.");
            return;
        }
        System.out.println("token = " + token);

        GetMethod get = new GetMethod(String.format("%s://%s:%s%s", PROTOCOL, HOST, PORT, specialPath));
        get.addRequestHeader("Cookie", String.format("%s=%s", COOKIE_NAME, token));

        int status = client.executeMethod(get);
        if (status == 200) {
            System.out.println(get.getResponseBodyAsString());
        } else {
            System.err
            .println("Unexcepted response code " + status + "; msg: " + get.getResponseBodyAsString());
        }
    }

    private static String getToken(String username, String password, HttpClient client) throws IOException,
            HttpException {
        String token = null;

        PostMethod authRequest = new PostMethod(String.format("%s://%s:%s/j_security_check", PROTOCOL, HOST, PORT));
        authRequest.setParameter("j_username", username);
        authRequest.setParameter("j_password", password);
        authRequest.setParameter("j_validate", "true");

        int status = client.executeMethod(authRequest);
        if (status == 200) {
            Header[] headers = authRequest.getResponseHeaders("Set-Cookie");
            for (Header header : headers) {
                String value = header.getValue();
                if (value.startsWith(COOKIE_NAME + "=")) {
                    int endIdx = value.indexOf(';');
                    if (endIdx > 0) {
                        token = value.substring(COOKIE_NAME.length() + 1, endIdx);
                    }
                }
            }
        } else {
            System.err
                    .println("Unexcepted response code " + status + "; msg: " + authRequest.getResponseBodyAsString());
        }
        return token;
    }

}