Commons Net example source code file (IOUtil.java)

This example Commons Net source code file (IOUtil.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Net tags/keywords

inputstream, interruptedexception, io, ioexception, ioexception, ioutil, outputstream, outputstream, override, override, thread, thread

The Commons Net IOUtil.java source code

/*
 * 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 examples.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.net.io.Util;

/***
 * This is a utility class providing a reader/writer capability required
 * by the weatherTelnet, rexec, rshell, and rlogin example programs.
 * The only point of the class is to hold the static method readWrite
 * which spawns a reader thread and a writer thread.  The reader thread
 * reads from a local input source (presumably stdin) and writes the
 * data to a remote output destination.  The writer thread reads from
 * a remote input source and writes to a local output destination.
 * The threads terminate when the remote input source closes.
 * <p>
 ***/

public final class IOUtil
{

    public static final void readWrite(final InputStream remoteInput,
                                       final OutputStream remoteOutput,
                                       final InputStream localInput,
                                       final OutputStream localOutput)
    {
        Thread reader, writer;

        reader = new Thread()
                 {
                     @Override
                     public void run()
                     {
                         int ch;

                         try
                         {
                             while (!interrupted() && (ch = localInput.read()) != -1)
                             {
                                 remoteOutput.write(ch);
                                 remoteOutput.flush();
                             }
                         }
                         catch (IOException e)
                         {
                             //e.printStackTrace();
                         }
                     }
                 }
                 ;


        writer = new Thread()
                 {
                     @Override
                     public void run()
                     {
                         try
                         {
                             Util.copyStream(remoteInput, localOutput);
                         }
                         catch (IOException e)
                         {
                             e.printStackTrace();
                             System.exit(1);
                         }
                     }
                 };


        writer.setPriority(Thread.currentThread().getPriority() + 1);

        writer.start();
        reader.setDaemon(true);
        reader.start();

        try
        {
            writer.join();
            reader.interrupt();
        }
        catch (InterruptedException e)
        {
        }
    }

}