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 018package examples.util; 019 020import java.io.IOException; 021import java.io.InputStream; 022import java.io.OutputStream; 023import 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 ***/ 035 036public final class IOUtil 037{ 038 039 public static final void readWrite(final InputStream remoteInput, 040 final OutputStream remoteOutput, 041 final InputStream localInput, 042 final OutputStream localOutput) 043 { 044 Thread reader, writer; 045 046 reader = new Thread() 047 { 048 @Override 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 @Override 073 public void run() 074 { 075 try 076 { 077 Util.copyStream(remoteInput, localOutput); 078 } 079 catch (IOException e) 080 { 081 e.printStackTrace(); 082 System.exit(1); 083 } 084 } 085 }; 086 087 088 writer.setPriority(Thread.currentThread().getPriority() + 1); 089 090 writer.start(); 091 reader.setDaemon(true); 092 reader.start(); 093 094 try 095 { 096 writer.join(); 097 reader.interrupt(); 098 } 099 catch (InterruptedException e) 100 { 101 // Ignored 102 } 103 } 104 105} 106