diff options
| author | Joe Robinson <joe@lc8n.com> | 2010-10-27 14:21:09 +0100 |
|---|---|---|
| committer | Joe Robinson <joe@lc8n.com> | 2010-10-27 14:21:09 +0100 |
| commit | 063284837c8c366e5502b1b0264b8eb807b61732 (patch) | |
| tree | fff3a1e1e5afaa671485b9d990704658276627ac /org/apache/commons/net/daytime/DaytimeUDPClient.java | |
Basic upload functionality to predifined location, with basic file browser
Diffstat (limited to 'org/apache/commons/net/daytime/DaytimeUDPClient.java')
| -rw-r--r-- | org/apache/commons/net/daytime/DaytimeUDPClient.java | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/org/apache/commons/net/daytime/DaytimeUDPClient.java b/org/apache/commons/net/daytime/DaytimeUDPClient.java new file mode 100644 index 0000000..64eef9d --- /dev/null +++ b/org/apache/commons/net/daytime/DaytimeUDPClient.java @@ -0,0 +1,84 @@ +/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.net.daytime;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.InetAddress;
+
+import org.apache.commons.net.DatagramSocketClient;
+
+/***
+ * The DaytimeUDPClient class is a UDP implementation of a client for the
+ * Daytime protocol described in RFC 867. To use the class, merely
+ * open a local datagram socket with
+ * {@link org.apache.commons.net.DatagramSocketClient#open open }
+ * and call {@link #getTime getTime } to retrieve the daytime
+ * string, then
+ * call {@link org.apache.commons.net.DatagramSocketClient#close close }
+ * to close the connection properly. Unlike
+ * {@link org.apache.commons.net.daytime.DaytimeTCPClient},
+ * successive calls to {@link #getTime getTime } are permitted
+ * without re-establishing a connection. That is because UDP is a
+ * connectionless protocol and the Daytime protocol is stateless.
+ * <p>
+ * <p>
+ * @author Daniel F. Savarese
+ * @see DaytimeTCPClient
+ ***/
+
+public final class DaytimeUDPClient extends DatagramSocketClient
+{
+ /*** The default daytime port. It is set to 13 according to RFC 867. ***/
+ public static final int DEFAULT_PORT = 13;
+
+ private byte[] __dummyData = new byte[1];
+ // Received dates should be less than 256 bytes
+ private byte[] __timeData = new byte[256];
+
+ /***
+ * Retrieves the time string from the specified server and port and
+ * returns it.
+ * <p>
+ * @param host The address of the server.
+ * @param port The port of the service.
+ * @return The time string.
+ * @exception IOException If an error occurs while retrieving the time.
+ ***/
+ public String getTime(InetAddress host, int port) throws IOException
+ {
+ DatagramPacket sendPacket, receivePacket;
+
+ sendPacket =
+ new DatagramPacket(__dummyData, __dummyData.length, host, port);
+ receivePacket = new DatagramPacket(__timeData, __timeData.length);
+
+ _socket_.send(sendPacket);
+ _socket_.receive(receivePacket);
+
+ return new String(receivePacket.getData(), 0, receivePacket.getLength());
+ }
+
+ /*** Same as <code>getTime(host, DaytimeUDPClient.DEFAULT_PORT);</code> ***/
+ public String getTime(InetAddress host) throws IOException
+ {
+ return getTime(host, DEFAULT_PORT);
+ }
+
+}
+
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