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 examples.util;
19
20 import java.io.IOException;
21 import java.io.InputStream;
22 import java.io.OutputStream;
23 import org.apache.commons.net.io.Util;
24
25 /***
26 * This is a utility class providing a reader/writer capability required
27 * by the weatherTelnet, rexec, rshell, and rlogin example programs.
28 * The only point of the class is to hold the static method readWrite
29 * which spawns a reader thread and a writer thread. The reader thread
30 * reads from a local input source (presumably stdin) and writes the
31 * data to a remote output destination. The writer thread reads from
32 * a remote input source and writes to a local output destination.
33 * The threads terminate when the remote input source closes.
34 * <p>
35 ***/
36
37 public final class IOUtil
38 {
39
40 public static final void readWrite(final InputStream remoteInput,
41 final OutputStream remoteOutput,
42 final InputStream localInput,
43 final OutputStream localOutput)
44 {
45 Thread reader, writer;
46
47 reader = new Thread()
48 {
49 @Override
50 public void run()
51 {
52 int ch;
53
54 try
55 {
56 while (!interrupted() && (ch = localInput.read()) != -1)
57 {
58 remoteOutput.write(ch);
59 remoteOutput.flush();
60 }
61 }
62 catch (IOException e)
63 {
64 //e.printStackTrace();
65 }
66 }
67 }
68 ;
69
70
71 writer = new Thread()
72 {
73 @Override
74 public void run()
75 {
76 try
77 {
78 Util.copyStream(remoteInput, localOutput);
79 }
80 catch (IOException e)
81 {
82 e.printStackTrace();
83 System.exit(1);
84 }
85 }
86 };
87
88
89 writer.setPriority(Thread.currentThread().getPriority() + 1);
90
91 writer.start();
92 reader.setDaemon(true);
93 reader.start();
94
95 try
96 {
97 writer.join();
98 reader.interrupt();
99 }
100 catch (InterruptedException e)
101 {
102 }
103 }
104
105 }
106