Java IO.pdf - Nguyen Dang Binh

}
}
}
String response = "Hello " + s.getInetAddress() + " on port "
+ s.getPort() + "\r\n";
response += "This is " + s.getLocalAddress() + " on port "
+ s.getLocalPort() + "\r\n";
OutputStream out = s.getOutputStream();
out.write(response.getBytes());
out.flush();
s.close();
}
catch (IOException e) {}
}
catch (IOException e) {System.err.println(e);}
Java I/O
Here's some output from our server. The server is running on utopia.poly.edu. The client is
connecting from titan.oit.unc.edu. Note how the port from which the connection comes
changes each time; like most client programs, the telnet program picks a random local port for
outgoing connections:
% telnet utopia.poly.edu 2545
Trying 128.238.3.21...
Connected to utopia.poly.edu.
Escape character is '^]'.
Hello titan.oit.unc.edu/152.2.22.14 on port 50361
This is utopia.poly.edu/128.238.3.21 on port 2545
Connection closed by foreign host.
% telnet utopia.poly.edu 2545
Trying 128.238.3.21...
Connected to utopia.poly.edu.
Escape character is '^]'.
Hello titan.oit.unc.edu/152.2.22.14 on port 50362
This is utopia.poly.edu/128.238.3.21 on port 2545
Connection closed by foreign host.
5.5 URLViewer
Example 5.6 is an improved version of the URLViewer you first encountered in Chapter 2.
This is a simple application that provides a window in which you can view the contents of a
URL. It assumes that those contents are more or less ASCII text. (In future chapters, I'll
remove that restriction.) Figure 5.1 shows the result. Our application has a text area in which
the user can type a URL, a Load button that the user uses to load the specified URL, and a
StreamedTextArea component that displays the text from the URL. Each of these
corresponds to a field in the URLViewer class.
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