[fixed] Perform RFC2396 style escape. I suppose the proper fix is to change the signature to return URI so that it works better with chaining (issue #1464)

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@8281 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Util.java

@@ -27,6 +27,8 @@ import java.io.Writer;
 import java.io.PrintStream;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.security.DigestInputStream;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -696,6 +698,23 @@ public class Util {
         }
     }
 
+    /**
+     * Encodes the URL by RFC 2396.
+     *
+     * I thought there's another spec that refers to UTF-8 as the encoding,
+     * but don't remember it right now.
+     *
+     * @since 1.204
+     */
+    public static String encodeRFC2396(String url) {
+        try {
+            return new URI(null,url,null).toASCIIString();
+        } catch (URISyntaxException e) {
+            LOGGER.warning("Failed to encode "+url);    // could this ever happen?
+            return url;
+        }
+    }
+
     /**
      * Wraps with the error icon and the CSS class to render error message.
      * @since 1.173