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Although either method can be used, and the servlet API makes the choice fairly transparent, several characteristics should be taken into account Because GET requests cause input values to be appended to the request URI, they are visible as name/value pairs on the browser address line and in Web server logs This makes GET undesirable for sending sensitive data like passwords Moreover, some servers and browsers may have restrictions on the length of URL s they can handle In addition, GET requests are described in the HTTP specification as idempotent, which means they can safely be repeated without undesirable side effects Under certain circumstances, this means a server can tell a client to reuse its existing copy of a resource rather than sending it a new copy This is usually not what you want as a response from form input For these reasons, POST is usually a better choice for the request method The method attribute is optional If not specified, GET is used by default The value of the attribute can be specified in either uppercase or lowercase

Like their client-side applet counterparts, servlets provide methods that are called when specific events occur in a larger context Programming in this environment

4:

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involves writing predefined methods (sometimes known as callback methods), which are called as required by a managing program An applet, for example, provides methods such as init(), start(), paint(), stop(), and destroy(), which are called by the applet run-time environment in response to actions the user takes The javaappletApplet base class provides default implementations for all these methods; you only override those that occur during events with which you are concerned You would write an init() method, for instance, if you have GUI components that need to be created Similarly, servlets operate in the context of a request and response model managed by a servlet engine The engine does the following: I Loads a servlet when it s first requested I Calls the servlet s init() method I Handles any number of requests by calling the servlet s service() method I When shutting down, calls each servlet s destroy() method As with applets, there are standard base classes javaxservletGenericServlet and javaxservlethttpHttpServlet that implement the servlet callback methods Servlet programming, then, consists of subclassing one of these classes and overriding the necessary method to accomplish the specific task at hand The following sections examine each of these lifecycle methods

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When a request for a servlet is received by the servlet engine, it checks to see if the servlet is already loaded If not, the servlet engine uses a class loader to get the particular servlet class required, and then invokes its constructor to get an instance of the servlet After the servlet is loaded, but before it services any requests, the servlet engine calls an initialization method with the following signature:

This method is called only once, just before the servlet is placed into service The ServletConfig object provides access to the servlet context (discussed later in this chapter) and to any initialization parameters coded for the servlet To maintain a reference to the servlet context, the config object must be stored as an instance variable, a task that s done by the init(ServletConfig) method in GenericServlet For this reason, it s important to call superinit(config) within the init() method of any subclass

Inside the init() method, the servlet can perform any necessary startup tasks, such as establishing database connections If any errors occur that make the servlet unable to handle requests, it should throw an UnavailableException1 This prevents requests from being directed to the servlet

After the init() method completes successfully, the servlet is able to accept requests By default, only a single instance of the servlet is created, and the servlet engine dispatches each request to the instance in a separate thread The servlet method that s called has the following signature:

public void service( ServletRequest request, ServletResponse response) throws ServletException, IOException;

The ServletRequest object is constructed by the servlet engine and acts as a wrapper for information about the client and the request This includes the identity of the remote system, the request parameters, and any input stream associated with the request Similarly, the ServletResponse object provides the means for a servlet to communicate its results back to the original requester It includes methods for opening an output stream and for specifying the content type and length As important as the service() method is, it s rarely used The reason for this is most servlets are designed to operate in the HTTP environment, for which there s a specialized javaxservlethttp package Rather than extending javaxservletGenericServlet directly, most servlets extend its subclass javaxservlethttpHttpServlet This subclass provides specialized methods corresponding to each HTTP request method: GET requests are handled by doGet(), POST requests by doPost(), and so on The signatures for these methods use HTTP-specific versions of the request and response objects:

public void doGet( HttpServletRequest request,

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