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JSP AND OTHER WEB COMPONENTS
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JSP: The Complete Reference
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// Write the column headings responsesetContentType("text/tab-separated-values"); ResultSetMetaData rmd = rsgetMetaData(); int nColumns = rmdgetColumnCount(); StringBuffer buffer = new StringBuffer(); for (int i = 0; i < nColumns; i++) { int col = i+1; if (i > 0) bufferappend("\t"); bufferappend(rmdgetColumnName(col)); } outprintln(buffertoString()); // Write the data from the result set while (rsnext()) { buffer = new StringBuffer(); for (int i = 0; i < nColumns; i++) { int col = i+1; if (i > 0) bufferappend("\t"); bufferappend(rsgetString(col)); } outprintln(buffertoString()); } // Done rsclose(); stmtclose(); } finally { if (con != null) { try { conclose(); } catch (SQLException ignore){} } } %>
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Communicating with Other Clients
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Perl s unofficial motto is there is more than one way to do it This being the case, any Perl script is only one of many possible implementations of the same task The script we use to access the JSP database server is GetBookspl This opens a socket to the LyricNote Web server on port 80, and then makes an HTTP GET request with the three required parameters, including the SQL query to be executed
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#! perl -w # # # # # # # # ============================================== Program: GetBooks Description: Sample Perl script that sends a database query to the SQLSelectjsp ==============================================
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use strict; use IO::Socket; my $hostName = "u25nv"; my $hostPort = "80"; # Open a socket to the host JSP AND OTHER WEB COMPONENTS
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my $socket = new IO::Socket::INET( PeerAddr => $hostName, PeerPort => $hostPort, Proto => "tcp" ); # Set autoflush on
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my $saveSelect = select $socket; $| = 1; select $saveSelect; # Create the command
my $cmd = "";
JSP: The Complete Reference
$cmd = "DRIVER=" encode("orgenhydrainstantdbjdbcidbDriver"); $cmd = "&URL=" encode("jdbc:idb:D:/lyricnote/WEBINF/database/products/dbprp"); $cmd = "&QUERY=" encode(<<EOF); SELECT itemCode, description FROM PRODUCTS WHERE PRODTYPE='BK' EOF my $cmdLength = length($cmd); # Send the HTTP request
print $socket (<<EOF); POST /jspcr/Chap20/examples/SQLSelectjsp HTTP/10 Content-Type: application/x-www-form-urlencoded Content-Length: $cmdLength $cmd EOF # Read back the status code
my $line = <$socket>; my ($httpVersion, $status) = split(/\s+/, $line); if ($status != 200) { # Handle the error
} else { # # Skip the rest of the headers and display the results End of headers is signaled by a blank line
my $inData = 0; while (<$socket>) { chomp; ($inData == 0) && do { $inData = 1 unless (/\S/); next;
20:
Communicating with Other Clients
}; ($inData == 1) && do { print "$_\n"; next; }; } } # Done
$socket->close(); # Subroutine to URL-encode a parameter string
sub encode { my $s = shift; $s =~ s/([^A-Za-z0-9 ])/"%" sprintf("%02X", ord($1))/eg; $s =~ s/ /+/g; return $s; }
In this case, GetBookspl requests the InstantDB database driver for use with the LyricNote product database, and requests the item code and description of every music-related book The following shows the results:
JSP AND OTHER WEB COMPONENTS itemcode 000030 000040 000120 000150 000160 000170 000200 000220 000240 000270 000280 000290 000330 description Dorothy Wendecker: Bartok in New York Conrad Stock: Beethoven and the Weather Louis Krouse: The Bad Tsar Alice Gabriel: Did Salieri Do the Deed John Glass: Stravinsky and the 20th Century Ballet Gray Raphael: Vox Humana Nicholas Thiers: Oh Boy! Oboe! Douglas Benton: Some Kind of Brass Theresa McDonald: The Lyric Viola Violet Barber: Who's Afraid of the Twelve Tone Row Rita Fall: What's My Melodic Line Mary Wright: More Ballet Bloopers Anna Maria Pontius: Purcell Mania
JSP: The Complete Reference
Summary
Although the most common JSP client is a Web browser, any program that can use the HTTP protocol can act as a client This chapter illustrates three alternative clients: I A standalone Java application that requests a dynamically created XML document I A Java applet that uses HTTP POST to access the JSP server I A Perl script that uses JSP as its database server The flexibility offered by this HTTP communications link makes incorporating JSP-based components in applications of all kinds possible
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Communicating with Other Servers
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JSP: The Complete Reference
he preceding chapter demonstrated that clients other than Web browsers can access JSP pages Using HTTP as the common technology, Java applications, applets, and programs written in other languages can use JSP pages as nonvisual components in systems of any kind The reverse is also true JSP pages can act as clients to other servers In this chapter, you examine two of these server environments and how JSP pages can interoperate with them
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