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Communicating with Other Clients
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StringBuffer sb = new StringBuffer(); sbappend("product="); sbappend(URLEncoderencode(product)); sbappend("&quantity="); sbappend(URLEncoderencode(StringvalueOf(quantity))); String postData = sbtoString(); // Create the URL from which the quote will be read URL supplierURL = new URL(getCodeBase(), "PriceQuotejsp"); // Open a URLConnection instance HttpURLConnection con = (HttpURLConnection) supplierURLopenConnection(); // Set up for writing and reading consetDoOutput(true); consetDoInput(true); consetUseCaches(false); // Tell the server that the input stream // contains POST data and give it the length consetRequestProperty( "Content-type", "application/x-www-form-urlencoded"); consetRequestProperty( "Content-length", StringvalueOf(postDatalength())); // Open an output stream for the connection // and write the POST data to it OutputStream out = congetOutputStream(); outwrite(postDatagetBytes()); outflush(); // Open an input stream and copy the results // into the output text area
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JSP AND OTHER WEB COMPONENTS
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JSP: The Complete Reference
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BufferedReader in = new BufferedReader( new InputStreamReader( congetInputStream())); txtOutputsetText(""); while (true) { String line = inreadLine(); if (line == null) break; txtOutputappend(line); txtOutputappend("\n"); } // Close the output and input streams inclose(); outclose(); } }
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The applet consists of two text fields for the product type and quantity, a button to initiate the search, and a text area to display the results This isn t a book on Swing, so we won t go into the details of how the GUI is constructed The method of interest is doPost(), for two reasons: I It shows how an applet connects to a URL input stream I It does so using the HTTP POST method POST differs from GET because the request parameters are supplied through the request body, rather than appended to the URL doPost() builds the request body as name/value pairs, using the URL encoding mechanism described in 12 (HTML Forms) It then opens a URLConnection to the JSP page, configures it with the content type and length, and then writes the request body doPost() reads the results and shows them in the output text area The JSP page that contains the applet is listed in the following Figure 20-1 shows the resulting output
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Communicating with Other Clients
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<%@ page session="false" %> <jsp:plugin type="applet" code="PriceQuoteAppletclass" codebase="" width="500" height="300" jreversion="12" > </jsp:plugin>
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Figure 20-1
Results of running PriceQuoteApplet
JSP: The Complete Reference
A Perl Client
Because communication between the JSP server and its clients uses HTTP, it isn t even necessary for the client to be written in Java Perl, for example, is a widely used scripting language, particularly in CGI applications, text processing, and system administration With excellent socket support, Perl can easily access server applications written in JSP An area in which JSP can extend Perl is by providing better database support Because virtually all database systems are accessible through some form of JDBC driver, and because Perl can read from JSP URL connections, Perl applications can use JSP as middleware for database access
The Generic Database Select Server
The JSP page listed here provides a means for making SQL SELECT queries on any JDBC-accessible database It accepts an HTTP request with three parameters: I DRIVER I URL I QUERY The JDBC driver class name A SELECT statement to be executed
The JDBC database URL
The results are written in tab-separated-values format, with the column names in the first row This JSP page illustrates another technique for preventing extraneous whitespace introduced by JSP elements from interfering with the strict output format This is done by calling responsereset() to clear the output buffer before it writes the first line of genuine text Note, reset() also clears any headers that were written and the status code For this reason, the Servlet 23 specification added a resetBuffer() method
<%@ page session="false" %> <%@ page import="javaio*" %> <%@ page import="javasql*" %> <% Connection con = null; try { // Get the driver name and database URL parameters String driver = requestgetParameter("DRIVER"); if (driver == null) throw new ServletException
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Communicating with Other Clients
("No driver class name specified"); String url = requestgetParameter("URL"); if (url == null) throw new ServletException ("No url class name specified"); // Get the SELECT statement to be executed String query = requestgetParameter("QUERY"); if (query == null) throw new ServletException ("No QUERY parameter specified"); // Verify that it is a SELECT statement query = querytrim(); if (!querytoUpperCase()startsWith("SELECT")) throw new ServletException ("Only SELECT statements are valid"); // Make sure the driver is loaded ClassforName(driver); // Open the connection con = DriverManagergetConnection(url); // Compile the query statement If it is invalid, // a SQLException will be thrown PreparedStatement stmt = conprepareStatement(query); // Execute the query ResultSet rs = stmtexecuteQuery(); // Reset the response buffer to eliminate // any nonsignificant whitespace responsereset();
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