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93 Common Gateway Interface (CGI)
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The Common Gateway Interface (CGI) is an interface that allows HTTP clients, such as Web browsers and other user agents, to pass information back to a server for processing CGI took the Web from static pages written by a Web master to interactive sites generated on the fly, in response to interactions with a user When you use a search engine, buy a book at an online store, or read a customized newspaper tailored to your interests, your browser is using CGI to communicate with a server-side application Earlier, we briefly discussed the POST method, which is used by HTTP clients to send information The GET method may also be used to transmit information, although there are limitations on the length of data that may be passed Let's look further at how GET and POST are used to send CGI requests to a server-side application
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931 Sending Data with the GET Method
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The GET method is used to request documents, images, and other files, and may also be used to call up server-side applications Normally, when called, data will be passed to the CGI application using a query string A query string is a string that is appended to the end of a URL in order to pass additional information such as the results of an HTTP form Let's look at an example query string, to better understand their syntax
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http://wwwsomeserverorg/cgibin/form_submit name=First%20Last&answer=no
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Because we know the format of a URL, we see nothing unexpected in the example before the " " character in the middle But what does the question mark signify, and what comes after it That's the query string Everything that follows the question mark is a CGI parameter These parameters are separated by an ampersand ("&") character You'll notice too that instead of the expected space between one's first and last names, there is a percentage sign and a number This has been encoded, as Web browsers and CGI scripts don't easily handle certain ASCII characters (such as spaces, punctuation, and line separators) URL encoding substitutes problematic characters when sent through a query string At the other end in the CGI script, URL decoding restores the characters to their original state Since query strings are passed as a URL, they may be viewed by look- ing at the URL location string within a browser In addition, the length of query strings is limited; long forms should be passed using the POST method
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Sending data with the POST method removes the length limitations of GET and allows more complex data to be sent While a query string may still be sent, data such as entire files and serialized objects may also be included Query strings should still be URL encoded, and are sent by writing to the output stream of a URLConnection object The format of a POST request was covered earlier, in Section 913, and the syntax of a query string is discussed above
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Sending a GET request in Java is simple, almost as easy as reading the contents of a static resource such as a Web page The only difference is in the construction of the URL To do this, all the parameters must be put together and their values encoded and then appended as a query string to a URL The following example shows how this is done Code for SendGET
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import javanet*; import javaio*; // 9, Listing 6 public class SendGET { public static void main(String args[]) throws IOException { // Check command line parameters if (argslength < 1) { Systemoutprintln ("Syntax- SendGET baseurl"); Systeminread(); return; } // Get the base URL of the cgi-script/servlet String baseURL = args[0]; // Start with a for the query string String arguments = " "; // Create a buffered reader, for reading CGI // parameters from the user BufferedReader reader = new BufferedReader ( new InputStreamReader ( Systemin ) ); // Loop until no parameters left for (;;) { Systemoutprintln ("Enter field ( terminates )"); String field = readerreadLine(); // If a char entered, terminate loop if (fieldequals ("")) break; Systemoutprintln ("Enter value"); String value = readerreadLine(); // Encode the URL value arguments += URLEncoderencode(field) + "=" + URLEncoderencode(value) + "&"; }
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// Construct the full GET request String finalURL = baseURL + arguments; Systemoutprintln ("Sending GET request - " + finalURL); // Send the GET request, and display output try { // Construct the url object URL url = new URL(finalURL); // Open a connection InputStream input = urlopenStream(); // Buffer the stream, for better performance BufferedInputStream bufIn = new BufferedInputStream(input); // Repeat until end of file for (;;) { int data = bufInread(); // Check for EOF if (data == -1) break; else Systemoutprint ( (char) data); } // Pause for user Systemoutprintln (); Systemoutprintln ("Hit enter to continue"); Systeminread(); } catch (MalformedURLException mue) { Systemerrprintln ("Bad URL - " + finalURL); } catch (IOException ioe) { Systemerrprintln ("I/O error " + ioe); } } }
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