HttpClient.java

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpClient {

    public int getHttResponseCode(String url) throws RuntimeException {
        HttpURLConnection connection = null;
        try {
            URL u = new URL(url);
            connection = (HttpURLConnection) u.openConnection();
            connection.setRequestMethod("HEAD");
            return connection.getResponseCode();
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }
    }
}

StatusCheckerGood.java

import java.util.Date;

public class StatusChecker {

    HttpClient httpClient;

    public StatusChecker(HttpClient httpClient) {
        this.httpClient = httpClient;
    }

    public WebsiteStatus getWebsiteStatus(String url) {
        String status = "DOWN";
        long startTime = System.currentTimeMillis();
        int httpResponseCode = httpClient.getHttResponseCode(url);
        long responseTime = System.currentTimeMillis() - startTime;
        if (isStatusGood(httpResponseCode)) {
            status = "UP";
        }
        return new WebsiteStatus(responseTime, status);
    }

    private boolean isStatusGood(int httpResponseCode) {
        return httpResponseCode == 200 || httpResponseCode == 301;
    }


    public static void main(String[] args) {
        StatusChecker statusChecker= new StatusChecker(new HttpClient());
        WebsiteStatus googleStatus = statusChecker.getWebsiteStatus("google.com");
        WebsiteStatus xebiaStatus = statusChecker.getWebsiteStatus("xebia.com");

    }


}


class WebsiteStatus {
    private final long responseTime;
    private final String currentStatus;
    private final Date currentTimestamp;

    public WebsiteStatus(long responseTime, String status) {
        this.responseTime = responseTime;
        this.currentStatus = status;
        this.currentTimestamp = new Date();
    }

    public long getResponseTime() {
        return responseTime;
    }


    public String getCurrentStatus() {
        return currentStatus;
    }

    public Date getCurrentTimestamp() {
        return currentTimestamp;
    }

}