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 ***/
35
36 public final class IOUtil
37 {
38
39 public static final void readWrite(final InputStream remoteInput,
40 final OutputStream remoteOutput,
41 final InputStream localInput,
42 final OutputStream localOutput)
43 {
44 Thread reader, writer;
45
46 reader = new Thread()
47 {
48 @Override
49 public void run()
50 {
51 int ch;
52
53 try
54 {
55 while (!interrupted() && (ch = localInput.read()) != -1)
56 {
57 remoteOutput.write(ch);
58 remoteOutput.flush();
59 }
60 }
61 catch (IOException e)
62 {
63 //e.printStackTrace();
64 }
65 }
66 }
67 ;
68
69
70 writer = new Thread()
71 {
72 @Override
73 public void run()
74 {
75 try
76 {
77 Util.copyStream(remoteInput, localOutput);
78 }
79 catch (IOException e)
80 {
81 e.printStackTrace();
82 System.exit(1);
83 }
84 }
85 };
86
87
88 writer.setPriority(Thread.currentThread().getPriority() + 1);
89
90 writer.start();
91 reader.setDaemon(true);
92 reader.start();
93
94 try
95 {
96 writer.join();
97 reader.interrupt();
98 }
99 catch (InterruptedException e)
100 {
101 // Ignored
102 }
103 }
104
105 }
106