This could be a repeat question, I apologize. I have a jsp page in which I have some buttons. Each button has its own servlet to call. I want to know if there is any way I can call these servlets without using form because the user may choose any of the 3 functionalities given. I also need to pass
Tag: servlets
how to convert PrintWriter to String or write to a File?
I am generating dynamic page using JSP, I want to save this dynamically generated complete page in file as archive. In JSP, everything is written to PrintWriter out = response.getWriter(); At the end of page, before sending response to client I want to save this page, either in file or in buffer as string for later treatment. How can I
How can I get a Spring bean in a servlet filter?
I have defined a javax.servlet.Filter and I have Java class with Spring annotations. I want to get the bean UsersConnectionRepository in my Filter, so I tried the following: But it always returns null. How can I get a Spring bean in a Filter? Answer Try: Where usersConnectionRepository is a name/id of your bean in the application context. Or even better:
How to add filters to servlet without modifying web.xml
I’d like the ability to modify/configure filters in a different way than web.xml. Here is a static configuration of 2 filters. I’d like the ability to have one filter statically configured and allow that filter to load additional filters. I just wanted to know if anyone knows of lib that already has this. Using Servlet API 2.5 I’ve seen this
Unable to select project for New->Servlet
I’m unable to create a new servlet because I cannot assign it a project. Also the browse buttons do not work, at all, as in they silently fail Am I missing something basic? I’ve been able to create,…
What is the difference between Servlet response methods addHeader and setHeader?
Can I use setHeader to set an new header? Or Do I need to addHeader first, then use setHeader method? Answer The documentation says that you can add multiple values to a particular header using the addHeader method, whereas an initial value would be overwritten if you use the setHeader method. In both cases a non-existent header would be created.
How to handle exceptions in Java Web Applications?
i would like to handle my exceptions in a way to warning the user about the errors that occured . What i know is something like: This is the best approach ? If not, what would you suggest ? Best regards, Valter Henrique. Answer An exception can be handled in different ways. In this case, it seems that the exception
httpURLConnection: how long can a post argument be?
I’m currently using something like this: With this I manage to pass some data to my server. What I’m wondering now is how much can be sent this way? I want to be able to send some xml files (100-200 lines long) and would like to know if I can do this? Jason Answer The post body (it’s not usually
How to check a uploaded file whether it is an image or other file?
In my web application I have an image uploading module. I want to check the uploaded file whether it’s an image file or any other file. I am using Java in server side. The image is read as BufferedImage in java and then I am writing it to disk with ImageIO.write() How shall I check the BufferedImage, whether it’s really
How can I upload files to a server using JSP/Servlet?
How can I upload files to server using JSP/Servlet? I tried this: 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 Common FileUpload. I tried this: Unfortunately, the servlet threw an exception without a clear message and cause. Here is the