1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.net.examples.util;
19
20 import java.io.IOException;
21 import java.io.InputStream;
22 import java.io.OutputStream;
23
24 import org.apache.commons.net.io.Util;
25
26 /**
27 * This is a utility class providing a reader/writer capability required
28 * by the weatherTelnet, rexec, rshell, and rlogin example programs.
29 * The only point of the class is to hold the static method readWrite
30 * which spawns a reader thread and a writer thread. The reader thread
31 * reads from a local input source (presumably stdin) and writes the
32 * data to a remote output destination. The writer thread reads from
33 * a remote input source and writes to a local output destination.
34 * The threads terminate when the remote input source closes.
35 */
36
37 public final class IOUtil
38 {
39
40 public static void readWrite(final InputStream remoteInput,
41 final OutputStream remoteOutput,
42 final InputStream localInput,
43 final OutputStream localOutput)
44 {
45 final Thread reader;
46 final Thread writer;
47
48 reader = new Thread()
49 {
50 @Override
51 public void run()
52 {
53 int ch;
54
55 try
56 {
57 while (!interrupted() && (ch = localInput.read()) != -1)
58 {
59 remoteOutput.write(ch);
60 remoteOutput.flush();
61 }
62 }
63 catch (final IOException e)
64 {
65 //e.printStackTrace();
66 }
67 }
68 }
69 ;
70
71
72 writer = new Thread()
73 {
74 @Override
75 public void run()
76 {
77 try
78 {
79 Util.copyStream(remoteInput, localOutput);
80 }
81 catch (final IOException e)
82 {
83 e.printStackTrace();
84 System.exit(1);
85 }
86 }
87 };
88
89
90 writer.setPriority(Thread.currentThread().getPriority() + 1);
91
92 writer.start();
93 reader.setDaemon(true);
94 reader.start();
95
96 try
97 {
98 writer.join();
99 reader.interrupt();
100 }
101 catch (final InterruptedException e)
102 {
103 // Ignored
104 }
105 }
106
107 }
108