Creating a Web Front End in .NET framework

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Creating a Web Front End
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URLEncoderencode("c_phone") + "=" + URLEncoderencode("" + resultSetgetLong("c_phone")); outprintln("<td>" + "<a href=\"CustomerSearchS" + sParams + "\">" + "+" + resultSetgetlnt ("c_country_code") + "-" + resultSetgetlnt("c_area_code") + "-" + resultSetgetLong("c_phone") + "</ax/td>") ; outprintln("</tr>"); }
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And finishes cleanly with:
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resultSetclose(); stmtclose(); connclose(); } catch (Exception e) { Systemerrprintlnl"Exception: CustomerListSservice: " + e) ; } outprintln("</table>"); out printlnl "</bodyx/html>") ; outclose(); } }
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Now, let us see some code that uses dbKona and htmlKona instead An example of this is OutletList jsp, which is used to list all the outlets of Pizza2Go:
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<%@ page import=" javautil*, j avasql*, weblogicdbj dbc*, weblogichtml* %> <html> <head> <title>Outlets List</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-l"> </head> <body bgcolor="#FFFFFF"> <a href="indexjsp">Main Menu</a> <h2 align="center">Outlets List</h2> <% Connection conn; try { Class forName ("weblogic jdbcpool Driver") newlnstance () ; conn = DriverManagergetConnection("jdbc:weblogic:pool:p2gPool");
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As usual, the JDBC driver is loaded and a connection is obtained from the pool
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DataSet dSet = new TableDataSet(conn, "outlet")fetchRecords() ;
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With this single line a DataSet is made available that contains all the records of the outlet table TableElement tE = new TableElement(dSet);
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This statement plus out print (tE) ; would be enough to present the whole table - that is how simple it is The developers, however, wanted to offer the user the ability to click on a specific outlet to obtain more detailed information about it This is done with the following code:
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tEsetBorder(1); TableDataElement cell = null; AnchorElement aE = null; StringElement sE = null; for (int i = 1; i < tEgetNumRows(); i++) { cell = tEgetCellAtd, 0) ; String objstr = cellgetElement()toString(); int index = objstrindexOf(''); objstr = objstrsubstring(0, index); cellsetElement( new LinkElement("OutletMaintenanceS o_outlet_code=" + objstr, objstr)); } outprint(tE); dSetclose(); connclose(); } catch (Exception e) { eprintStackTrace(Systemerr); outprint(e) ; } %> </body> </html>
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Creating a Web Front End
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Within the for loop, the outlet number is extracted and used to create a link in the first column The linkElement (} method defines a link with the OutletMaintenanceS servlet with the appropriate parameter, which is the oudet number A sample output of this JSP page is shown in the following screenshot:
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We do not hesitate in recommending the use of dbKona and htmlKona, because of the gains in productivity they provide, if you're working exclusively with WebLogic, More information and examples on these APIs can be found in the WebLogic documentation
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Architecture Overview
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During the course of this chapter we have seen how Mrs Chief Architect, Mr Senior Developer, and their team familiarized themselves with the servlet and JSP APIs and experimented with different architectures for their web interface It's useful to review these models, this time using specific code developed in the chapter
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Model 1 Architecture
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The order list is a good example of Model 1 Architecture The content and the presentation of the list are implemented in Order-List, jsp, which is responsible both for searching the database for orders belonging to a given customer, and for presenting the results
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The sequence of events presented in the figure above is: 1 2 3 The JSP page receives a request issued by the browser with the HTTP GET command The JSP page accesses its session to get the current customer info and store it in aJavaBean Then it searches for orders in the database usingJDBC
4 Finally it constructs an HTML table, which it sends back to the browser
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Model 2 Architecture
The customer search and maintenance part of the application is a clear example of the Model 2 architecture Here CustomerForm jsp is responsible for the customer data presentation It expects all the necessary customer data in a JavaBean in the session It is the responsibility of the servlets (CustomerSearchS and CustomerMaintenanceS) to store the relevant information in the Customer JavaBean before calling the JSP page
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The sequence of events presented above relates to the Customers ear chS servlet: 1 2 The servlet receives the request The servlet searches for the data in the database
3 It stores the data in the Customer JavaBean in the session 4 The servlet forwards the request to the JSP page 5 6 The JSP page retrieves the customer data from the JavaBean in the session The JSP page presents the customer information to the browser in HTML form