Developing Java Servlets, Edition: 2nd ed by James Goodwill, Bryan Morgan

By James Goodwill, Bryan Morgan

Constructing Java Servlets, moment version, is a finished, code-intensive publication for pro Java builders. It explains the Java Servlet API structure and client/server improvement techniques and includes specific, expert programming ideas for development refined e-commerce and database servlet functions. New issues coated within the up-to-date variation are: JavaMail, Servlets with XML, JSP, and EJB, Pluggable net functions, instant servlets with WML/WMLScripts

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Example text

This method should be used only if you are sure the request contains only one value for the parameter. If the parameter has multiple values you should use getParameterValues(). getParameterValues() returns the values of the specified parameter as an array of strings, or null if the named parameter does not exist in the request. Servicing the GET and POST Requests Let’s take a look at a servlet that services a POST request. 1 retrieves the parameters sent to it and returns the parameters and their values back to the client.

The first thing he does is look at the available titles. When he has found the title he is interested in, he makes his selection. The problem now is determining who made the selection. Because each one of the client’s requests is independent of the previous requests, you have no idea who actually made the final selection. NOTE You could use HTTP authentication as a method of session tracking, but each of your customers would need an account on your site. This is fine for some businesses, but would be a hassle for a high-volume site.

The service() Method The service() method handles all requests sent by a client. It cannot start servicing requests until the init() method has been executed. You will not usually implement this method directly, unless you extend the GenericServlet abstract class. The most common implementation of the service() method is in the HttpServlet class. The HttpServlet class implements the Servlet interface by extending GenericServlet. 1 requests by determining the request type and calling the appropriate method.

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