This article provides a list of java servlet interview questions and answers to help you pass the java developer or tester interview. Because servlet is the key component of the java web application, it is more popular these days. There are a lot of frameworks such as Struts and Spring that are all developed based …
There are two methods in servlet to dispatch user requests to other web resources such as JSP, HTML, or another servlet in the same or different web applications. They are RequestDispatcher interface and HttpServletResponse‘s sendRedirect() method. RequestDispatcher is used to dispatch requests to the resource run in the same web applications, and sendRedirect() can be …
HttpSession is used to save user session-related information. It is provided by java servlet API. When a session request comes to a servlet container, it will create a HttpSession object on the server-side and then assign a unique id to the session object. The session id will be returned back to the client browser, and …
ServletRequest instance is used to retrieve request information send from client users. We commonly use the HttpServletRequest object in java servlet code. You can use it to collect content length, content type, parameter name-value pairs, HTTP header, etc. You can click here to see a detailed introduction to the HttpServletRequest object method. We will give …
A cookie is a small piece of data stored in a web browser’s cache or text file in a user machine by a web server. It can be sent back to the web server again when the client user uses the same web browser to access the same web server at next time. Then web …
The HTTP protocol is stateless. A web server will not remember whether a new request comes from the same client or not. But in some cases such as shopping cart or user register manager, we should know which request comes from which client user. The HTTP session is just the solution to resolve this problem.
ServletConfig is used to read servlet configuration data in web.xml. Web container will create one ServletConfig instance for each servlet. The advantage of using this object is that you can make your servlet variable’s value parameterized. You can save the variable value in web.xml as servlet init parameters and get that value from web.xml in …
The website consists of static resources and dynamic resources. Static resources include Html page, javascript, CSS, images, etc. And dynamic resources include CGI, Servlet, JSP, etc. In this article, we will give you a general explanation about Web Applications, J2EE Servlet, and CGI. We will also compare them to point out the advantage and disadvantages …
Servlet is managed by the servlet container, the container manages the entire lifecycle of the servlet. When the servlet container startup, it will initialize several servlet instances, at this time the servlet init() method will be invoked. When the servlet container receives an HTTP request, it will execute the servlet’s service() method, and when the …
