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  /*
   * 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.echo;
 
 
The EchoUDPClient class is a UDP implementation of a client for the Echo protocol described in RFC 862. To use the class, just open a local UDP port with open and call send to send datagrams to the server, then call receive to receive echoes. After you're done echoing data, call close() to clean up properly.

 
 
 public final class EchoUDPClient extends DiscardUDPClient
 {
    
The default echo port. It is set to 7 according to RFC 862. *
 
     public static final int DEFAULT_PORT = 7;
 
     private final DatagramPacket __receivePacket = new DatagramPacket(new byte[0], 0);

    
Sends the specified data to the specified server at the default echo port.

Parameters:
data The echo data to send.
length The length of the data to send. Should be less than or equal to the length of the data byte array.
host The address of the server.
Throws:
java.io.IOException If an error occurs during the datagram send operation.
 
     @Override
     public void send(byte[] dataint lengthInetAddress host)
     throws IOException
     {
         send(datalengthhost);
     }


    
Same as send(data, data.length, host) *
 
     @Override
     public void send(byte[] dataInetAddress hostthrows IOException
     {
         send(datadata.lengthhost);
     }


    
Receives echoed data and returns its length. The data may be divided up among multiple datagrams, requiring multiple calls to receive. Also, the UDP packets will not necessarily arrive in the same order they were sent.

Returns:
Length of actual data received.
Throws:
java.io.IOException If an error occurs while receiving the data.
 
     public int receive(byte[] dataint lengththrows IOException
     {
         .setData(data);
         .setLength(length);
         .receive();
         return .getLength();
     }

    
Same as receive(data, data.length) *
 
     public int receive(byte[] datathrows IOException
     {
         return receive(datadata.length);
     }
 
 }

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