Servlets provide a component-based, platform-independent method for building Web-based applications, without the performance limitations of CGI programs. Servlets have access to the entire family of Ja

The mood example application, located in the tut-install/examples/web/mood/ directory, is a simple example that displays Duke’s moods at different times during the day. The example shows how to develop

I’ve seen in some websites that user signed in into their accounts and then closed the browser. After closed and re-opened the browser and their accounts are still signed in. But some websites, canno

Servlet is an interface defining what a servlet must implement. GenericServlet is just that, a generic, protocol-independent servlet. HttpServlet is a servlet tied specifically to the HTTP protocol.I

Tomcat provides a number of excellent servlet examples in “<CATALINA_HOME>\webapps\examples“. The servlet source files are kept under “<CATALINA_HOME>\webapps\examples\WEB-INF\classes“, together with t

Servlet是一些遵从Java Servlet API的Java类，这些Java类可以响应请求。尽管Servlet可以响应任意类型的请求，但是它们使用最广泛的是响应web方面的请求。 Servlet必须部署在Java servlet容器才能使用。虽然很多开发者都使用Java Server Pages（JSP）和Java Server Faces（JSF）等Servlet框架，但是这些技术都要在幕后

import java.io.CharArrayWriter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.ser

I’ve been searching the net and stackoverflow for an example of somebody inserting content into the response using a servlet filter, but can only find examples of people capturing/compressing the outpu

A custom tag is a user-defined JSP language element. When a JSP page containing a custom tag is translated into a servlet, the tag is converted to operations on an object called a tag handler. The Web

I have two applications - A Java EE web application and a Java SE applet. I want to authenticate a user in the applet by means of a JSESSIONID (which is created by the web application). So there is a

You should have logout servlet/jsp which invalidates the session using the following ways:- Before Servlet 3.0, using `session.invalidate()` method which invalidates the session also.- Servlet 3.0 pro

I am using Form-based authentication provided by GlassFish v3 btw. Most of the website, when the user about to provide the username and password to log into the system, it has a checkbox “Stay logged

There may be instances where you want to modify the response before it is written to the client. In this tutorial we will show how to write a regex to append to a html element.I was working on a projec

在 Servlet API 中有一个 ServletContextListener 接口，它能够监听ServletContext对象的生命周期，实际上就是监听Web应用的生命周期。当Servlet 容器启动或终止Web 应用时，会触发ServletContextEvent事件，该事件由 ServletContextListener来处理。在ServletContextListener接口中定义了处理

For a Java servlet to be accessible from a browser, you must tell the servlet container what servlets to deploy, and what URL’s to map the servlets to. This is done in the web.xml file of your Java web

The HttpServlet class request processing methods take two parameters. javax.servlet.http.HttpRequest javax.servlet.http.HttpResponseFor instance, here is the signature of the HttpServlet.doGet()

What is a Servlet?A Java Servlet is a Java object that responds to HTTP requests. It runs inside a Servlet container. Here is an illustration of that: A Servlet is part of a Java web application. A

What are Servlets?Java Servlets are programs that run on a Web or Application server and act as a middle layer between a request coming from a Web browser or other HTTP client and databases or applicat

Use the @WebServlet annotation to define a servlet component in a web application. This annotation is specified on a class and contains metadata about the servlet being declared. The annotated servlet

Servlets are Java classes which service HTTP requests and implement the javax.servlet.Servletinterface. Web application developers typically write servlets that extend javax.servlet.http.HttpServlet, a

The context in which web components execute is an object that implements the ServletContext interface. You retrieve the web context by using the getServletContext method. The web context provides metho

The javax.servlet.http.HttpServlet class is a slightly more advanced base class than the GenericServlet shown in the Simple Servlet example.The HttpServlet class reads the HTTP request, and determines

The web container may determine that a servlet should be removed from service (for example, when a container wants to reclaim memory resources or when it is being shut down). In such a case, the contai

HTTP Cookies are little pieces of data that a web application can store on the client machine of users visiting the web application. Typically up to 4 kilo bytes of data. This text will explain how to

The service provided by a servlet is implemented in the service method of a GenericServlet, in the doMethod methods (where Method can take the value Get, Delete, Options, Post, Put, or Trace) of an Htt

Many applications require that a series of requests from a client be associated with one another. For example, a web application can save the state of a user’s shopping cart across requests. Web-based

The RequestDispatcher class enables your servlet to “call” another servlet from inside another servlet. The other servlet is called as if an HTTP request was sent to it by a browser.You can obtain a Re

A servlet follows a certain life cycle. The servlet life cycle is managed by the servlet container. The life cycle contains the following steps:Load Servlet Class.Create Instance of Servlet.Call the

A Java Servlet is just an ordinary Java class which implements the interfacejavax.servlet.Servlet;The easiest way to implement this interface is to extend either the class GenericServlet or HttpServlet

The HttpSession object represents a user session. A user session contains information about the user across multiple HTTP requests.When a user enters your site for the first time, the user is given a u

What’s the difference between:InputStream is = this.getClass().getClassLoader().getResourceAsStream(fileName)andInputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileN