CODEWITHSUNDEEP
javajsp
user4596341
user4596341

Reputation:

How to read from file on page load using jsp?

I have one webpage and a file on a server. How to read from file on every page load. I m using jsp. Is there any function available to check page load?

Upvotes: 2

Views: 1148

Answers (1)

Alex
Alex

Reputation: 4473

Every page load means that you come to server every time (cache is another story). So, jsp is loaded from the server every time and here is simple directive to include file to jsp:

<%@ include file="foo.html" %>

Keep in mind that server knows only about jsp changes but not about foo.html changes. So, if you change only foo.html server doesn't know about it. That's the reason why this approach is not common. It is used mostly for common templates and parts of all pages (like common footer) even there are other better modern techniques to do so (like CSS).

However, if you still want to use external file which constantly changes just remember that JSP is Java too and you can use whatever you do in Java (except it is not recommended - JSP should be simple viewer in MVC). So, something like this will work:

<% out.write(Files.readAllBytes("foo.html")); %>

You can use any techniques to read file and write it to the response output.

Addition for your comment: Text field is regular html. Input to it would be like this:

 <input name=abc value="<% out.write(Files.readAllBytes("foo.txt")); %>">

but, again, please consider more modern techniques like DHTML, AJAX, CSS or simple JavaScript.

Upvotes: 3

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