java barcode api JSP: The Complete Reference in Java

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JSP: The Complete Reference
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Date: Tue, 05 Dec 2000 03:59:35 GMT Server: Apache/1312 (Win32) Connection: Keep-alive, close Content-Length: 434 Content-Type: text/html; charset=ISO-8859-1
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<HTML> <HEAD> <TITLE>Form Parameters</TITLE> </HEAD> <BODY> <H3>Form Parameters</H3> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0"> <TR><TH WIDTH=200>Name</TH><TH WIDTH=200>Value</TH></TR> <TR><TD>flight</TD><TD>on</TD></TR> <TR><TD>speed</TD><TD>on</TD></TR> <TR><TD>power</TD><TD>on</TD></TR> <TR><TD>name</TD><TD>C Kent</TD></TR> <TR><TD>locale</TD><TD>en_US</TD></TR> </TABLE> </BODY> </HTML>
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To troubleshoot a Web application effectively, you must be able to monitor how it makes requests and receives responses You already saw that Java classes can act both as a Web client and a Web server In this section, you develop a monitoring tool that performs both functions, acting as the middleman between the client and server, as illustrated in Figure 17-4 When this tracer tool is plugged into a Web application, its server component listens for HTTP requests, logs their headers, and then forwards them to the real Web server Its client component then receives the Web server s response, logs the headers, and sends the response back to the client Neither the client nor the server is aware of the tracer s presence in the loop
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Figure 17-4
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Configuration of the HTTP tracer in a Web application
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The tool consists of two main components: I A Web server proxy that listens for HTTP requests I A request handler that copies the client request to the server and the response back to the client, logging headers in both directions The following lists the first component (Tracerjava)
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package http; import javaio*; import javanet*; import javautil*; /** * Acts as a proxy web server, capturing requests * and responses and echoing the headers to a * log stream */ public class Tracer extends Thread implements Logger { public static final int DEFAULT_PORT = 8601; private private private private String host; int port; int tracerPort; PrintWriter logWriter; JSP IN ACTION
JSP: The Complete Reference
// =========================================== // Class methods // =========================================== /** * Mainline */ public static void main(String[] args) throws IOException { String opt_host = null; String opt_port = null; String opt_tracerPort = null; String opt_log = null; try { for (int i = 0; i < argslength; i++) { String arg = args[i]; if (!argstartsWith("-")) throw new IllegalArgumentException ("Unknown argument [" + arg + "] Use -h for help"); // -h for help String keyword = argsubstring(1); if (keywordequals("h") || keywordequals("help")) { showUsage(); return; } // -host <hostname> if (keywordequals("host")) { if (++i >= argslength) throw new IllegalArgumentException (arg + " but no argument"); opt_host = args[i]; }
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JSP Testing and Debugging
else // -port <hostname> if (keywordequals("port")) { if (++i >= argslength) throw new IllegalArgumentException (arg + " but no argument"); opt_port = args[i]; } else // -tracerPort <hostname> if (keywordequals("tracerPort")) { if (++i >= argslength) throw new IllegalArgumentException (arg + " but no argument"); opt_tracerPort = args[i]; } else // -log <filename> if (keywordequals("log")) { if (++i >= argslength) throw new IllegalArgumentException (arg + " but no argument"); opt_log = args[i]; } else throw new IllegalArgumentException ("Unrecognized option " + arg); } // Verify that there is no port conflict int testTracerPort = (opt_tracerPort == null) DEFAULT_PORT : IntegerparseInt(opt_tracerPort); int testHostPort = (opt_port == null)
JSP IN ACTION
JSP: The Complete Reference
RequestHandlerDEFAULT_PORT : IntegerparseInt(opt_port); if (testTracerPort == testHostPort) throw new IllegalArgumentException ("Cannot assign port and tracerPort both to " + testHostPort); } catch (IllegalArgumentException e) { Systemerrprintln(egetMessage()); return; } // Create the tracer Tracer tracer = new Tracer(); // Set its properties, if any if (opt_host != null) tracersetHost(opt_host); if (opt_port != null) tracersetPort(IntegerparseInt(opt_port)); if (opt_tracerPort != null) tracersetTracerPort (IntegerparseInt(opt_tracerPort)); if (opt_log != null) tracersetLogWriter(new FileWriter(opt_log)); tracerstart(); } /** * Displays calling syntax */ public static final void showUsage() { String[] text = { "", "usage: java httpTracer [options]",
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JSP Testing and Debugging
"", "where options are:", "", "-host <hostName> " + "(defaults to " + RequestHandlerDEFAULT_HOST + ")", "-port <hostPort> " + "(defaults to " + RequestHandlerDEFAULT_PORT + ")", "-tracerPort <localPort> " + "(defaults to " + DEFAULT_PORT + ")", "-log <fileName> " + "(defaults to Systemout)", }; for (int i = 0; i < textlength; i++) Systemoutprintln(text[i]); } JSP IN ACTION // =========================================== // Instance methods // =========================================== public void run() { // Set defaults if not otherwise specified if (tracerPort == 0) tracerPort = DEFAULT_PORT; if (logWriter == null) logWriter = new PrintWriter(Systemout); // Start proxy server try { log("M: Opening tracer server on tracerPort " + tracerPort); ServerSocket server = new ServerSocket(tracerPort); // Loop forever
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