Preferred Java way to ping a HTTP Url for availability

浏览数：23 / 时间：2015年06月08日

I need a monitor class that regularly checks whether a given HTTP URL is available. I can take care of the "regularly" part using the Spring TaskExecutor abstraction, so that‘s not the topic here. The Question is:What is the preferred way to ping a URL in java?

Here is my current code as a starting point:

package org.javalobby.tnt.net;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class DnsTest {
    public static void main(String[] args) {
        String url = "http://www.baidu.com";
        try{
            final URLConnection connection = new URL(url).openConnection();
            connection.connect();
            System.out.println("Service " + url + " available, yeah!");
        } catch(final MalformedURLException e){
            throw new IllegalStateException("Bad URL: " + url, e);
        } catch(final IOException e){
            System.out.println("Service " + url + " unavailable, oh no!  " + e);
        }
    }

}

Is this any good at all (will it do what I want?)
Do I have to somehow close the connection?
I suppose this is a GET request. Is there a way to send HEAD instead?

Is this any good at all (will it do what I want?)

You can do so. Another feasible way is using java.net.Socket.

        url = "www.baidu.com";
        Socket socket = null;
        boolean reachable = false;
        try {
            socket = new Socket(url, 80);
            reachable = true;
            System.out.println("true");
        } finally {            
            if (socket != null) try { socket.close(); } catch(IOException e) {}
        }

There‘s also the InetAddress#isReachable():

boolean reachable = InetAddress.getByName(hostname).isReachable();

This however doesn‘t explicitly test port 80. You risk to get false negatives due to a Firewall blocking other ports.

Do I have to somehow close the connection?

No, you don‘t explicitly need. It‘s handled and pooled under the hoods.

I suppose this is a GET request. Is there a way to send HEAD instead?

You can cast the obtained URLConnection to HttpURLConnection and then use setRequestMethod() to set the request method. However, you need to take into account that some poor webapps or homegrown servers may return HTTP 405 error for a HEAD (i.e. not available, not implemented, not allowed) while a GET works perfectly fine. But, those are pretty rare cases.

Update as per the comments: connecting a host only informs if the host is available, not if the content is available. You seem to be more interested in the content since it can as good happen that a webserver has started without problems, but the webapp failed to deploy during server‘s start. This will however usually not cause the entire server to go down. So you‘d like to determine the HTTP response code.

    url = "http://www.baidu.com";
        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
        connection.setRequestMethod("HEAD");
        int responseCode = connection.getResponseCode();
        if (responseCode != 200) {
            // Not OK.
            System.out.println("Not Ok");
        }

        // < 100 is undetermined.
        // 1nn is informal (shouldn‘t happen on a GET/HEAD)
        // 2nn is success
        // 3nn is redirect
        // 4nn is client error
        // 5nn is server error

For more detail about response status codes see RFC 2616 section 10. Calling connect() is by the way not needed if you‘re determining the response data. It will implicitly connect.

For future reference, here‘s a complete example in flavor of an utility method, also taking account with timeouts:

/**
 * Pings a HTTP URL. This effectively sends a HEAD request and returns <code>true</code> if the response code is in 
 * the 200-399 range.
 * @param url The HTTP URL to be pinged.
 * @param timeout The timeout in millis for both the connection timeout and the response read timeout. Note that
 * the total timeout is effectively two times the given timeout.
 * @return <code>true</code> if the given HTTP URL has returned response code 200-399 on a HEAD request within the
 * given timeout, otherwise <code>false</code>.
 */
public static boolean ping(String url, int timeout) {
    url = url.replaceFirst("https", "http"); // Otherwise an exception may be thrown on invalid SSL certificates.

    try {
        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
        connection.setConnectTimeout(timeout);
        connection.setReadTimeout(timeout);
        connection.setRequestMethod("HEAD");
        int responseCode = connection.getResponseCode();
        return (200 <= responseCode && responseCode <= 399);
    } catch (IOException exception) {
        return false;
    }
}