Archive for: September, 2014

Reading Servlet Parameters

Reading Servlet Parameters The ServletRequest class includes methods that allow you to read the names and values of parameters that arc included in a client ,request. We will develop a servlet that illustrates their use. The example contains two files: Post Parameters.htm defines a Web page, and Post Parameters Servlet.java defines a servlet. The HTML source code for Post…

Read More →

THe ServletOutputStream Class.

THe ServletOutputStream Class. The Servletoutputstream ·dass extends OutputStream. It is implemented by the server and provides output stream that a servlet developer can use to write data to a client response. A default constructor is defined. It also defines the print() and . println( ) methods, which output data to, the stream: The ServletException Class “ The Servletlixception…

Read More →

The SingleThreadmodel Interface The SingleThreadModel interface is used to indicate that only a single thread should execute the service( ) method of a servlet, It defines no constants and declares no methods. If a servlet implements this interface, the server creates several instances of it. When a client request arrives, it is sent to an available instance of the servlet.…

Read More →

The ServletContext Interface

The ServletContext .Interface The requestContext interface is implemented hy the server. It enables servlets to obtain information about their environment. One important note: The gcrScrvlett ) and getScrvlctNames( ) methods are dangerous touse, because they can corrupt the server’s state machine. Method String get Servletoutputstream getOutputStream( ) throws IOException PrintWriter getWriter( } throws IOException void setContentLength(int size}…

Read More →

The Servlet Interface

The Servlet Interface All servlets must implement the Scrvlct interface. It declares. the inil( ), service( ), and dcstroy() 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 nil)’ initialization parameters. The methods defined by Servlet Description Returns the value of the…

Read More →

The Servlet API

The Servlet API Two packages contain the code the it servlet: javax.servlet and javax.servlet.http. They constitute the Servlet API.It the time of this writing) these packages are not part of the java : Therefore, they arc nut included in the Java Development Kit ODK). You must download the Java Servlet Development Kit OSDK) to obtain their functionality.The Servlet API…

Read More →

Start the servletrunner Utility

Start the servletrunner Utility Open a command prompt window and type servletrunner to start that utility, This loop listens on port for incoming client requests. Start a Web Browser and Request the Servlet Start a Web browser and enter the URL shown here: http://localho~t:aoup~serVlct/Hel]oServlct Alternatively.you may enter U1e’ URL shown here: http://127.0.0.1:BOBO/scrvlcL/HelloServlet This can be done because…

Read More →

Create and Compile the Servlet Source Code

Create and Compile the Servlet Source Code To begin, create a file named HelloServlet.java that contains the following program: import java.io. import javax.servlet public class HelloServlet extend  GenericServlet public void service(ServletRequest request. servletRe~onse response) throws Servletexception  IOException response setContent Type(“text/html) Printwriter pw = response.getwriter pw.println(“<B>Hello!”) ps close() First, note that this program imports the [avax.servlet…

Read More →

The Simple Servlet

The Simple Servlet  To become familiar with the key servlet concepts, we will begin by building and testing a simple servlet. The basic steps are the following: 1. Create and compile the servlet source code. 2. Start the servletrunner utility. 3. Start a Web browser and request the servlet. The following sections examine each of these…

Read More →

The Java Servlet Development

The Java Servlet Development  The Java Servlet Development Kit OSDK}contains the class libraries that you wilt need to create servlets, A utility known ao the scrvlctrnnner is also included, which enables you to ttll.it. Nom,~ of  servlets Lllt you create, We will tool to execute the examples- in this chapter. You can download the JSDK without charge from the Sun Microsystems…

Read More →

Back to Top