visual basic 2010 barcode generator The javaxservlet Package in Java

Painting QR Code in Java The javaxservlet Package

The javaxservlet Package
QR Code ISO/IEC18004 Generator In Java
Using Barcode maker for Java Control to generate, create QR image in Java applications.
QR Code JIS X 0510 Reader In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
The javaxservlet package contains a number of interfaces and classes that establish the framework in which servlets operate The following table summarizes the interfaces that are provided in this package The most significant of these is Servlet All servlets must implement this interface or extend a class that implements the interface The ServletRequest and ServletResponse interfaces are also very important Interface Servlet ServletConfig ServletContext Description Declares life cycle methods for a servlet Allows servlets to get initialization parameters Enables servlets to log events and access information about their environment Used to read data from a client request Used to write data to a client response Indicates that the servlet is thread safe
Drawing Barcode In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.
Bar Code Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
ServletRequest ServletResponse SingleThreadModel
QR Code JIS X 0510 Generator In C#
Using Barcode drawer for .NET framework Control to generate, create QR image in .NET framework applications.
QR-Code Printer In .NET
Using Barcode creation for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
The following table summarizes the classes that are provided in this package: Class GenericServlet ServletInputStream Description Implements the Servlet and ServletConfig interfaces Provides an input stream for reading requests from a client Provides an output stream for writing responses to a client
Painting QR In .NET Framework
Using Barcode creation for VS .NET Control to generate, create Quick Response Code image in .NET applications.
Denso QR Bar Code Printer In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
ServletOutputStream
Making UCC - 12 In Java
Using Barcode encoder for Java Control to generate, create EAN128 image in Java applications.
Painting Code-39 In Java
Using Barcode drawer for Java Control to generate, create Code 39 Extended image in Java applications.
- 620 -
Barcode Maker In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
Barcode Drawer In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
ServletException UnavailableException
USS-93 Printer In Java
Using Barcode printer for Java Control to generate, create ANSI/AIM Code 93 image in Java applications.
Bar Code Recognizer In .NET Framework
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
Indicates that a servlet error occurred Indicates that a servlet is permanently or temporarily unavailable
Encode Barcode In .NET Framework
Using Barcode encoder for Reporting Service Control to generate, create barcode image in Reporting Service applications.
Printing Code 128 In None
Using Barcode creation for Software Control to generate, create Code 128 Code Set B image in Software applications.
The following sections examine these interfaces and classes in more detail
Bar Code Encoder In Java
Using Barcode printer for Android Control to generate, create bar code image in Android applications.
Bar Code Maker In .NET
Using Barcode generation for ASP.NET Control to generate, create bar code image in ASP.NET applications.
The Servlet Interface
Recognize GS1 - 12 In Visual Studio .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
UPC-A Drawer In C#
Using Barcode encoder for VS .NET Control to generate, create UPC Symbol image in VS .NET applications.
All servlets must implement the Servlet interface It declares the init( ), service( ), and destroy( ) methods that are called by the server during the life cycle of a servlet A method is also provided that allows a servlet to obtain any initialization parameters The methods defined by Servlet are shown in Table 27-1 Table 27-1 The Methods Defined by Serviet
Method
Description
void destroy( )
Called when the servlet is unloaded
ServletConfig getServletConfig( Returns a ServletConfig object that contains any ) initialization parameters String getServletInfo( ) void init(ServletConfig sc) throws ServletException Returns a string describing the servlet Called when the servlet is initialized Initialization parameters for the servlet can be obtained from sc An UnavailableException should be thrown if the servlet cannot be initialized Called to process a request from a client The request from the client can be read from req The response to the client can be written to res An exception is generated if a servlet or IO problem occurs
void service(ServletRequest req, ServletResponse res) throws ServletException, IOException
The init( ), service( ), and destroy( ) methods are the life cycle methods of the servlet These are invoked by the server The getServletConfig( ) method is called by the servlet to obtain initialization parameters A servlet developer overrides the getServletInfo( ) method to provide a string with useful information (for example, the author, version, date, copyright, and so forth) This method is also invoked by the server
The ServletConfig Interface
The ServletConfig interface is implemented by the server It allows a servlet to obtain configuration data when it is loaded The methods declared by this interface are summarized here: Method Description
- 621 -
ServletContext getServletContext( ) String getInitParameter(String param)
Returns the context for this servlet Returns the value of the initialization parameter named param Returns an enumeration of all initialization parameter names
Enumeration getInitParameterNames( )
The ServletContext Interface
The ServletContext interface is implemented by the server It enables servlets to obtain information about their environment Its methods are summarized in Table 27-2 One important note: The getServlet( ) and getServletNames( ) methods are dangerous to use, because they can corrupt the server's state machine Table 27-2 The Methods Defined by ServletContext
Method
Description
Object getAttribute(String attr)
Returns the value of the server attribute named attr Returns the MIME type of file Returns the real path that corresponds to the virtual path vpath Returns information about the server Returns the servlet named sname
String getMimeType(String file) String getRealPath(String vpath)
String getServerInfo( ) Servlet getServlet(String sname) throws ServletException Enumeration getServletNames( )
Returns an enumeration with the names of servlets in the same namespace in the server Writes s to the server log Write s and the stack trace for e to the server log
void log(String s) void log(Exception e, String s)
Copyright © OnBarcode.com . All rights reserved.