validate URL by connecting to it - Java Network

Java examples for Network:Http

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Description

validate URL by connecting to it

Demo Code


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import org.apache.log4j.Logger;

public class Main{
    public static void main(String[] argv) throws Exception{
        String checkURL = "java2s.com";
        System.out.println(validateURL(checkURL));
    }//w w  w .  j a v  a 2s  .c o m
    private static final String SORRY_PAGE = "Sorry, the page you requested was not found";
    private static Logger log = Logger.getLogger(CommonUtils.class
            .getName());
    /**
     * @param checkURL
     * @return
     */
    public static boolean validateURL(String checkURL) {
        try {
            URL url = new URL(checkURL);
            URLConnection connection = url.openConnection();
            connection.connect();
            if (connection instanceof HttpURLConnection) {
                HttpURLConnection httpConnection = (HttpURLConnection) connection;
                httpConnection.setConnectTimeout(500);
                int code = httpConnection.getResponseCode();
                String pageContents = getPageContents(connection);

                if (((code == 200 || code == 301 || code == 302 || code == 403))) {
                    if (!pageContents.contains(SORRY_PAGE)) { //&& (!pageContents.contains(SEARCH_PAGE))) {
                        return true;
                    } else {
                        log.error("Redirected to yahoo search page "
                                + checkURL);
                        return false;
                    }
                } else {
                    log.error(checkURL + " returned - " + code);
                    return false;
                }
            } else {
                log.error("error - not a http request!");
                return false;
            }
        } catch (Exception e) {
            log.error("Validation failed " + e.getMessage());
            return false;
        }
    }
    /**
     * @param connection
     * @return
     * @throws IOException
     */
    public static String getPageContents(URLConnection connection)
            throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(
                connection.getInputStream()));

        StringBuilder response = new StringBuilder();
        String inputLine;

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

        in.close();
        return response.toString();
    }
}

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