java qr code reader open source Session and Thread Management in Java

Print QR Code in Java Session and Thread Management

Session and Thread Management
QR Code ISO/IEC18004 Generation In Java
Using Barcode generation for Java Control to generate, create QR Code ISO/IEC18004 image in Java applications.
Scan QR-Code In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
In addition to creating the BoundConnection when necessary, connectjsp sets the session timeout interval to three minutes The application shown in the following uses a BoundConnection to provide quick access for repeated database queries ComposerSearchjsp prompts for a nationality and century, and then searches the LyricNote composer database and displays the results It includes connectjsp to do the actual connection and session binding work
Bar Code Printer In Java
Using Barcode encoder for Java Control to generate, create barcode image in Java applications.
Decode Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
<%@ page session="true" %> <%@ page import="jspcrjdbc*" %> <%@ page import="javasql*" %> <% // Get form parameters or use defaults String nationality = requestgetParameter("nationality"); if (nationality == null) nationality = ""; String yearRange = requestgetParameter("yearRange"); if (yearRange == null) yearRange = "1901-2000"; %> <HTML> <HEAD> <TITLE>Composer Search</TITLE> </HEAD> <BODY> <CENTER> <H3>Composer Search</H3> <FORM METHOD="POST"> <B>Nationality:</B> <INPUT TYPE="TEXT" NAME="nationality" VALUE="<%= nationality %>"> <B>Century:</B> <SELECT NAME="yearRange"> <% // Create the century option list for (int century = 16; century <= 20; century++) { int fromYear = (century - 1) * 100 + 1; int toYear = century * 100; StringBuffer sb = new StringBuffer(); sbappend("<OPTION"); if (yearRangestartsWith("" + fromYear)) sbappend(" SELECTED"); JSP IN ACTION
QR Code Creation In C#
Using Barcode generator for VS .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
Drawing QR-Code In .NET
Using Barcode drawer for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
JSP: The Complete Reference
Paint QR Code JIS X 0510 In .NET
Using Barcode printer for VS .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
QR-Code Maker In VB.NET
Using Barcode printer for .NET framework Control to generate, create QR-Code image in .NET framework applications.
sbappend(" VALUE='"); sbappend(fromYear); sbappend("-"); sbappend(toYear); sbappend("'>"); sbappend(century); sbappend("th Century</OPTION>"); outprintln(sb); } %> </SELECT> <INPUT TYPE="SUBMIT" VALUE="Search"> </FORM> <% // If values were entered in the form, display results if (!nationalityequals("")) { %> <%-- Get the bound connection --%> <jsp:include page="connectjsp" flush="true"/> <TABLE BORDER=0 CELLPADDING=1 CELLSPACING=1> <% BoundConnection bcon = (BoundConnection) sessiongetAttribute("bcon"); Connection con = bcongetConnection(); String sql = "" + " SELECT lname, fname, born, died" + " FROM composers" + " WHERE nationality = " + " AND ((born between and )" + " OR (died between and ))" + " ORDER BY born, lname" ; PreparedStatement pstmt = conprepareStatement(sql); int fromYear = IntegerparseInt(yearRangesubstring(0, 4)); int toYear = IntegerparseInt(yearRangesubstring(5)); pstmtsetString(1, nationality);
Drawing Linear In Java
Using Barcode generator for Java Control to generate, create 1D Barcode image in Java applications.
Bar Code Generation In Java
Using Barcode generation for Java Control to generate, create barcode image in Java applications.
14:
UPC-A Encoder In Java
Using Barcode printer for Java Control to generate, create Universal Product Code version A image in Java applications.
Drawing EAN128 In Java
Using Barcode encoder for Java Control to generate, create GTIN - 128 image in Java applications.
Session and Thread Management
Printing 4-State Customer Barcode In Java
Using Barcode generation for Java Control to generate, create 4-State Customer Barcode image in Java applications.
Make Barcode In Java
Using Barcode maker for BIRT reports Control to generate, create barcode image in Eclipse BIRT applications.
pstmtsetInt(2, fromYear); pstmtsetInt(3, toYear); pstmtsetInt(4, fromYear); pstmtsetInt(5, toYear); ResultSet rs = pstmtexecuteQuery(); while (rsnext()) { String lname = rsgetString(1); String fname = rsgetString(2); int born = rsgetInt(3); int died = rsgetInt(4); %> <TR> <TD><%= fname %> <%= lname %></TD> <TD><%= born %>-<%= died %></TD> </TR> <% } rsclose(); pstmtclose(); %> </TABLE> <% } %> </CENTER> </BODY> </HTML>
GTIN - 12 Recognizer In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Painting EAN 128 In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create EAN / UCC - 13 image in .NET framework applications.
JSP IN ACTION
Print USS Code 128 In C#.NET
Using Barcode encoder for .NET Control to generate, create USS Code 128 image in Visual Studio .NET applications.
Barcode Drawer In Java
Using Barcode printer for Eclipse BIRT Control to generate, create barcode image in BIRT reports applications.
To access the session-resident connection, all the application must do is retrieve the bcon session attribute, cast it to a BoundConnection, and call its getConnection() method Notice it s unnecessary to close the connection explicitly This is done automatically when three minutes have expired with no further requests from the client The resulting Web page, seen in Figure 14-5, can be used for repeated queries with a new connection required only for the first one The trace entries in the Systemerr log show the BoundConnection lifecycle in the HTTP session:
Decode Code39 In VB.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Scanning Barcode In VB.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in VS .NET applications.
TRACE: TRACE: TRACE: TRACE: 07:55:00 07:55:00 07:59:38 07:59:38 session session session session 8720188469 8720188469 8720188469 8720188469 last accessed time 07:55:00 connection bound last accessed time 07:56:38 connection unbound
JSP: The Complete Reference
Figure 14-5
A Web database query that uses BoundConnection
The connection was bound to the session at 07:55:00 and used one or more times, the last time being 07:56:38 Three minutes later, at 07:59:38, the session timed out, unbinding the BoundConnection object This, in turn, caused the valueUnbound() method to be called, which closed the underlying connection
Thread Management
Servlets and JSP pages have a significant advantage over older server-side technologies because they are loaded into memory and run as single instances in a multithreaded environment This benefit comes with a tradeoff, however The multithreaded model
14:
Session and Thread Management
introduces difficulties that don t exist in simpler application models For example, if a servlet has instance variables, they can potentially be accessed simultaneously from different requests If both requests write to the variables, their values may be unpredictable Fortunately, because the servlet engine is written in Java, it can take advantage of Java s built-in support for multithreaded applications In this section, you learn about some basic threading concepts, examine two servlet threading models, and consider an efficient multithreaded application
Copyright © OnBarcode.com . All rights reserved.