001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package examples;
019
020 import java.io.IOException;
021 import java.io.InputStream;
022 import java.io.OutputStream;
023 import org.apache.commons.net.io.Util;
024
025 /***
026 * This is a utility class providing a reader/writer capability required
027 * by the weatherTelnet, rexec, rshell, and rlogin example programs.
028 * The only point of the class is to hold the static method readWrite
029 * which spawns a reader thread and a writer thread. The reader thread
030 * reads from a local input source (presumably stdin) and writes the
031 * data to a remote output destination. The writer thread reads from
032 * a remote input source and writes to a local output destination.
033 * The threads terminate when the remote input source closes.
034 * <p>
035 ***/
036
037 public final class IOUtil
038 {
039
040 public static final void readWrite(final InputStream remoteInput,
041 final OutputStream remoteOutput,
042 final InputStream localInput,
043 final OutputStream localOutput)
044 {
045 Thread reader, writer;
046
047 reader = new Thread()
048 {
049 public void run()
050 {
051 int ch;
052
053 try
054 {
055 while (!interrupted() && (ch = localInput.read()) != -1)
056 {
057 remoteOutput.write(ch);
058 remoteOutput.flush();
059 }
060 }
061 catch (IOException e)
062 {
063 //e.printStackTrace();
064 }
065 }
066 }
067 ;
068
069
070 writer = new Thread()
071 {
072 public void run()
073 {
074 try
075 {
076 Util.copyStream(remoteInput, localOutput);
077 }
078 catch (IOException e)
079 {
080 e.printStackTrace();
081 System.exit(1);
082 }
083 }
084 };
085
086
087 writer.setPriority(Thread.currentThread().getPriority() + 1);
088
089 writer.start();
090 reader.setDaemon(true);
091 reader.start();
092
093 try
094 {
095 writer.join();
096 reader.interrupt();
097 }
098 catch (InterruptedException e)
099 {
100 }
101 }
102
103 }
104