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To display a dynamically loaded image in my webapp I'm using a BufferedDynamicImageResource. (It just loads the image from a backend server based on an database id.)

The URL of the image resource ends up as:

http://localhost:8080/wicket/page?17-IResourceListener-logotype
                                  ^^
                            sequence number

where the sequence number increases for each such image I generate.

The problem is that the URL is reused from execution to execution (the sequence number is reset to 0) so when I restart the server the browser does not fetch the newly generated images, but instead uses the cached versions (which were generated last execution of the webapp).

My Question: What is the best way to avoid this behavior? (If I could for instance add the database id of the image which is loaded to the URL, everything would work fine.)

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The most common way to solve this would be to mount the resource as seen here. Using this approach, you could use the id as a parameter or add an (ignored) random parameter to prevent caching completely.

于 2013-07-09T18:04:45.637 回答