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Note the connection string that points to a nonexistent database. The DataContext class uses the connection string to discover whether the database already exists. Otherwise it uses the catalog option specified in the connection string as database name and creates it. Using the DatabaseExists and DeleteDatabase methods we can check if the database already exists and if so, drop it. There are some limitations when using the CreateDatabase method to create a database: Because stored procedures, UDFs, and triggers are not defined in the entity classes as structure, they are not reproduced. Despite the fact that associations could be declared into entity classes, the method is not able to create foreign keys and constraints. The application must impersonate a user who has rights to create the database.

WebClient s calling syntax is java WebClient [-host <hostName>] [-port <portNumber>] When started, it opens a socket connection to the specified host (default is localhost), and then waits for an HTTP request and optional headers to be entered from the keyboard Each line entered by the user is sent out over the socket Input terminates when a blank line is entered This signals to the HTTP server that no more headers will be sent and the request is complete, except possibly for data being sent with a POST request After the request is sent and processed, the server sends back a response, which is echoed to the console A typical exchange might be

D:\jspcr\Chap17\examples>java WebClient POST /jspcr/Chap17/examples/Echojsp HTTP/10 Content-type: application/x-www-form-urlencoded Content-length: 53 speed=on&power=on&flight=on&name=C+Kent&locale=en_US HTTP/11 200 OK

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>

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

17:

Figure 17-4

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)

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

// =========================================== // 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]; }

17:

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