I read many articles to understand Java servlet but I did not succeed. Can you please give brief introduction of Java servlets (in easy language). What is a servlet? What are the advantages? I can’t understand the difference between server-side programming languages (PHP, ASP) and servlets. 12 Answers 12
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago. Improve this question I am designing a simple web-based application. I am new to this web-based domain.I needed your … Read more
How can I upload files to server using JSP/Servlet? I tried this: <form action=”upload” method=”post”> <input type=”text” name=”description” /> <input type=”file” name=”file” /> <input type=”submit” /> </form> However, I only get the file name, not the file content. When I add enctype=”multipart/form-data” to the <form>, then request.getParameter() returns null. During research I stumbled upon Apache … Read more
I have some questions. These are : How are JSP and Servlet related to each other? Is JSP some kind of Servlet? How are JSP and JSF related to each other? Is JSF some kind of Pre-Build UI based JSP like ASP.NET-MVC? 16 s 16 JSP (JavaServer Pages) JSP is a Java view technology running … Read more
Suppose, I have a webserver which holds numerous servlets. For information passing among those servlets I am setting session and instance variables. Now, if 2 or more users send request to this server then what happens to the session variables? Will they all be common for all the users or they will be different for … Read more
The problem is that you mapped your servlet to /register.html and it expects POST method, because you implemented only doPost() method. So when you open register.html page, it will not open html page with the form but servlet that handles the form data. Alternatively when you submit POST form to non-existing URL, web container will … Read more
What is Java Servlet?
Just construct a new ArrayList wrapping the keyset of the request parameter map. List<String> parameterNames = new ArrayList<String>(request.getParameterMap().keySet()); // … I only wonder how it’s useful to have it as List<String>. A Set<String> would make much more sense as parameter names are supposed to be unique (a List can contain duplicate elements). A Set<String> is also exactly what the map’s keyset already represents. Set<String> parameterNames = request.getParameterMap().keySet(); // … … Read more
To set a session-timeout that never expires is not desirable because you would be reliable on the user to push the logout-button every time he’s finished to prevent your server of too much load (depending on the amount of users and the hardware). Additionaly there are some security issues you might run into you would … Read more
How to solve javax.net.ssl.SSLHandshakeException Error?
