cz.mmsparams.api.http.HttpGetUtil Maven / Gradle / Ivy

Go to download
package cz.mmsparams.api.http;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.annotation.Nonnull;

import cz.mmsparams.api.logging.APILoggerFactory;
import cz.mmsparams.api.logging.ApiLogFacade;
import cz.mmsparams.api.logging.ILogger;
import cz.mmsparams.api.utils.LogUtil;

public class HttpGetUtil
{
    private static final ILogger LOGGER = APILoggerFactory.getLogger(HttpGetUtil.class);

    private HttpGetUtil()
    {
    }

    @Nonnull
    public static TaskResult getDataFromUrl(final String url)
    {
        HttpURLConnection conn = null;
        try
        {
            final URL u = new URL(url);
            conn = (HttpURLConnection) u.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Content-length", "0");
            conn.setUseCaches(true);
            conn.setAllowUserInteraction(false);
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);

            conn.connect();
            final int status = conn.getResponseCode();

            switch (status)
            {
                case 200:
                case 201:
                    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    StringBuilder sb = new StringBuilder();
                    String line;
                    while ((line = br.readLine()) != null)
                    {
                        sb.append(line).append(LogUtil.NEW_LINE);
                    }
                    br.close();
                    return new TaskResult<>(sb.toString());
                default:
                    return new TaskResult<>(new Exception("Invalid status code: " + status));
            }
        }
        catch (Exception e)
        {
            ApiLogFacade.logEx(LOGGER, "getDataFromUrl", e);
            return new TaskResult<>(e);
        }
        finally
        {
            if (conn != null)
            {
                try
                {
                    conn.disconnect();
                }
                catch (Exception ex)
                {
                    ApiLogFacade.logEx(LOGGER, "getDataFromUrl", ex);
                }
            }
        }
    }
}