2 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
3 * Copyright (C) $$Year-Rel$$ The Jalview Authors
5 * This file is part of Jalview.
7 * Jalview is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, either version 3
10 * of the License, or (at your option) any later version.
12 * Jalview is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Jalview. If not, see <http://www.gnu.org/licenses/>.
19 * The Jalview Authors are detailed in the 'AUTHORS' file.
23 import java.io.BufferedInputStream;
25 import java.io.FileOutputStream;
26 import java.io.IOException;
27 import java.io.InputStream;
28 import java.net.HttpURLConnection;
29 import java.net.ProtocolException;
31 import java.util.List;
33 import javax.ws.rs.HttpMethod;
35 public class HttpUtils
39 * Returns true if it is possible to open an input stream at the given URL,
40 * else false. The input stream is closed.
45 public static boolean isValidUrl(String url)
47 InputStream is = null;
50 is = new URL(url).openStream();
55 } catch (IOException x)
57 // MalformedURLException, FileNotFoundException
66 } catch (IOException e)
74 public static boolean startsWithHttpOrHttps(String file)
76 return file.startsWith("http://") || file.startsWith("https://");
80 * wrapper to get/post to a URL or check headers
86 * @throws ProtocolException
88 public static boolean checkUrlAvailable(URL url,
89 int readTimeout) throws IOException, ProtocolException
91 // System.out.println(System.currentTimeMillis() + " " + url);
93 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
95 connection.setRequestMethod(HttpMethod.HEAD);
97 connection.setDoInput(true);
99 connection.setUseCaches(false);
100 connection.setConnectTimeout(300);
101 connection.setReadTimeout(readTimeout);
102 return connection.getResponseCode() == 200;
106 * download from given URL and return a pointer to temporary file
108 public static File fetchURLToTemp(String url) throws OutOfMemoryError,
111 long time = System.currentTimeMillis();
112 URL rcall = new URL(url);
114 InputStream is = new BufferedInputStream(rcall.openStream());
118 outFile = File.createTempFile("jalview", ".xml");
119 outFile.deleteOnExit();
120 if (outFile.length() == 0)
125 } catch (Exception ex)
131 FileOutputStream fio = new FileOutputStream(outFile);
132 byte[] bb = new byte[32 * 1024];
134 while ((l = is.read(bb)) > 0)