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examples.nntp.newsgroups |
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1 | /* |
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2 | * Copyright 2001-2005 The Apache Software Foundation |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package examples.nntp; |
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17 | ||
18 | import java.io.IOException; |
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19 | import org.apache.commons.net.nntp.NNTPClient; |
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20 | import org.apache.commons.net.nntp.NewsgroupInfo; |
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21 | ||
22 | /*** |
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23 | * This is a trivial example using the NNTP package to approximate the |
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24 | * Unix newsgroups command. It merely connects to the specified news |
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25 | * server and issues fetches the list of newsgroups stored by the server. |
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26 | * On servers that store a lot of newsgroups, this command can take a very |
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27 | * long time (listing upwards of 30,000 groups). |
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28 | * <p> |
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29 | ***/ |
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30 | ||
31 | 0 | public final class newsgroups |
32 | { |
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33 | ||
34 | public final static void main(String[] args) |
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35 | { |
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36 | NNTPClient client; |
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37 | NewsgroupInfo[] list; |
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38 | ||
39 | 0 | if (args.length < 1) |
40 | { |
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41 | 0 | System.err.println("Usage: newsgroups newsserver"); |
42 | 0 | System.exit(1); |
43 | } |
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44 | ||
45 | 0 | client = new NNTPClient(); |
46 | ||
47 | try |
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48 | { |
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49 | 0 | client.connect(args[0]); |
50 | ||
51 | 0 | list = client.listNewsgroups(); |
52 | ||
53 | 0 | if (list != null) |
54 | { |
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55 | 0 | for (int i = 0; i < list.length; i++) |
56 | 0 | System.out.println(list[i].getNewsgroup()); |
57 | } |
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58 | else |
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59 | { |
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60 | 0 | System.err.println("LIST command failed."); |
61 | 0 | System.err.println("Server reply: " + client.getReplyString()); |
62 | } |
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63 | 0 | } |
64 | 0 | catch (IOException e) |
65 | { |
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66 | 0 | e.printStackTrace(); |
67 | 0 | } |
68 | finally |
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69 | { |
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70 | 0 | try |
71 | { |
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72 | 0 | if (client.isConnected()) |
73 | 0 | client.disconnect(); |
74 | } |
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75 | 0 | catch (IOException e) |
76 | { |
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77 | 0 | System.err.println("Error disconnecting from server."); |
78 | 0 | e.printStackTrace(); |
79 | 0 | System.exit(1); |
80 | 0 | } |
81 | 0 | } |
82 | ||
83 | 0 | } |
84 | ||
85 | } |
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86 | ||
87 |
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