X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Futil%2FHttpUtils.java;fp=src%2Fjalview%2Futil%2FHttpUtils.java;h=88df58772d55349c8a535320903ccca34c2fb644;hb=e411c801ba976142e207e28f196d59ab24507767;hp=0000000000000000000000000000000000000000;hpb=95e1400e3e807ec4eb7fb23e6d2ae2519416baa3;p=jalview.git

diff --git a/src/jalview/util/HttpUtils.java b/src/jalview/util/HttpUtils.java
new file mode 100644
index 0000000..88df587
--- /dev/null
+++ b/src/jalview/util/HttpUtils.java
@@ -0,0 +1,47 @@
+package jalview.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+public class HttpUtils
+{
+
+  /**
+   * Returns true if it is possible to open an input stream at the given URL,
+   * else false. The input stream is closed.
+   * 
+   * @param url
+   * @return
+   */
+  public static boolean isValidUrl(String url)
+  {
+    InputStream is = null;
+    try
+    {
+      is = new URL(url).openStream();
+      if (is != null)
+      {
+        return true;
+      }
+    } catch (IOException x)
+    {
+      // MalformedURLException, FileNotFoundException
+      return false;
+    } finally
+    {
+      if (is != null)
+      {
+        try
+        {
+          is.close();
+        } catch (IOException e)
+        {
+          // ignore
+        }
+      }
+    }
+    return false;
+  }
+
+}