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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 15 | arune | 1 | /* |
| 2 | * TcpClient.java |
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| 3 | * |
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| 4 | * Created on den 25 augusti 2003, 22:50 |
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| 5 | */ |
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| 6 | package Macbeth.Net; |
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| 7 | |||
| 8 | import java.net.*; |
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| 9 | import java.io.*; |
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| 10 | |||
| 11 | /** |
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| 12 | * A TCP client that sends data to a TCP Server. |
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| 13 | * @author Jimmy |
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| 14 | */ |
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| 15 | public class TcpClient { |
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| 16 | private int port; |
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| 17 | private String hostname; |
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| 18 | private Socket socket; |
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| 19 | private BufferedWriter bw; |
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| 20 | private BufferedReader br; |
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| 21 | |||
| 22 | /** |
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| 23 | * Creates a new instance of TcpClient. |
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| 24 | * @param port The port that the socket connection should be opened through use. |
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| 25 | * @param hostname The hostname that the socket should connect to. |
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| 26 | */ |
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| 27 | public TcpClient(int port, String hostname) { |
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| 28 | this.port = port; |
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| 29 | this.hostname = hostname; |
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| 30 | socket = null; |
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| 31 | bw = null; |
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| 32 | br = null; |
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| 33 | } |
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| 34 | |||
| 35 | /** |
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| 36 | * Finds out whether or not the client has successfully |
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| 37 | * connected to the server. |
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| 38 | * @return true if connected, false otherwise. |
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| 39 | */ |
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| 40 | public boolean isConnected() { |
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| 41 | if (socket!=null && bw!=null) { |
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| 42 | return socket.isConnected(); |
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| 43 | } else { |
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| 44 | return false; |
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| 45 | } |
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| 46 | } |
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| 47 | |||
| 48 | /** |
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| 49 | * Opens the connection to the server. |
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| 50 | * @throws UnknownHostException if the hostname is invalid. |
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| 51 | * @throws IOException if an I/O-error occurs while trying to connect. |
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| 52 | */ |
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| 53 | public void openConnection() throws UnknownHostException,IOException { |
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| 54 | if (hostname==null || hostname.equals("")) return; |
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| 55 | socket = new Socket(hostname, port); |
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| 56 | bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); |
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| 57 | br = new BufferedReader(new InputStreamReader(socket.getInputStream()) ); |
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| 58 | } |
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| 59 | |||
| 60 | /** |
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| 61 | * Closes the connection to the server. |
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| 62 | * @throws IOException if an I/O-error occurs while trying to close connection. |
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| 63 | */ |
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| 64 | public void closeConnection() throws IOException { |
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| 65 | if (bw!=null) { |
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| 66 | bw.close(); |
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| 67 | } |
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| 68 | if (br!=null) { |
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| 69 | br.close(); |
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| 70 | } |
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| 71 | socket.close(); |
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| 72 | } |
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| 73 | |||
| 74 | /** |
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| 75 | * Sends a string to the server through the socket. |
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| 76 | * @param s The string. It will be sent immediately (output stream is flushed). |
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| 77 | * @throws IOException If an I/O-error occurs while trying to send the string. |
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| 78 | */ |
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| 79 | public void sendString(String s) throws IOException { |
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| 80 | if (isConnected()) { |
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| 81 | bw.write(s); |
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| 82 | bw.newLine(); |
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| 83 | bw.flush(); |
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| 84 | } else { |
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| 85 | throw new IOException("Not connected to server!"); |
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| 86 | } |
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| 87 | } |
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| 88 | |||
| 89 | |||
| 90 | /** |
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| 91 | * Gets a row of data from the server through the socket. |
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| 92 | * @throws IOException If an I/O-error occurs while trying to receive a row. |
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| 93 | */ |
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| 94 | public String getRow() throws IOException { |
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| 95 | if (isConnected()) { |
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| 96 | return br.readLine(); |
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| 97 | } else { |
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| 98 | throw new IOException("Not connected to server!"); |
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| 99 | } |
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| 100 | } |
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| 101 | } |