caching

问题 HI, I am trying to display results from a database in results.php. In the same file, after all the data has been displayed in the current webpage,I am placing a button to create a file based on this results to produce a Excel file. I am not sure how to do this. I have tried but it says you have to force excel file download before any echo, but I want to display as well as produce an excel file. Is this possible or am I missing something? can anyone please let me know how to do this correctly?

问题 I have two separate caches running in a JVM (one controlled by a third party library) each using soft references. I would prefer for the JVM to clear out my controlled cache before the one controlled by the library. The SoftReference javadoc states: All soft references to softly-reachable objects are guaranteed to have been cleared before the virtual machine throws an OutOfMemoryError. Otherwise no constraints are placed upon the time at which a soft reference will be cleared or the order in

问题 I'm having an issue with a page in internet explorer. I have an ajax call that calls a form, in other browser, when I click the link it passes in the controller and load correctly data. but in IE, when its loaded once, it aways brings me the same old results without passing in the controller. 回答1: Try: [OutputCache(NoStore = true, Duration = 0, VaryByParam = "*")] This attribute, placed in controller class, disables caching. Since I don't need caching in my application, I placed it in my

问题 I am a former PHP developer learning Rails and Sinatra. In PHP, every page request loaded all of the required files. If I changed some code and refreshed the page, I could be sure that the code was fresh. In Rails 3, Controller code is fresh on every request. However, if I modify any code in the /lib folder, I need to restart the server so the changes take effect. Why does this happen? Is it something to do with the way Ruby is designed? Is Rails doing some optimizations to avoid reloading

问题 I am a former PHP developer learning Rails and Sinatra. In PHP, every page request loaded all of the required files. If I changed some code and refreshed the page, I could be sure that the code was fresh. In Rails 3, Controller code is fresh on every request. However, if I modify any code in the /lib folder, I need to restart the server so the changes take effect. Why does this happen? Is it something to do with the way Ruby is designed? Is Rails doing some optimizations to avoid reloading

问题 I am a former PHP developer learning Rails and Sinatra. In PHP, every page request loaded all of the required files. If I changed some code and refreshed the page, I could be sure that the code was fresh. In Rails 3, Controller code is fresh on every request. However, if I modify any code in the /lib folder, I need to restart the server so the changes take effect. Why does this happen? Is it something to do with the way Ruby is designed? Is Rails doing some optimizations to avoid reloading

问题 Which is the best method to make the browser use cached versions of js files (from the serverside)? 回答1: Have a look at Yahoo! tips: https://developer.yahoo.com/performance/rules.html#expires. There are also tips by Google: https://developers.google.com/speed/docs/insights/LeverageBrowserCaching 回答2: or in the .htaccess file AddOutputFilter DEFLATE css js ExpiresActive On ExpiresByType application/x-javascript A2592000 回答3: I just finished my weekend project cached-webpgr.js which uses the

问题 To initialise Scalacache instance in my service import scala cache._ implicit val scalaCache = ScalaCache(new MyCache()) but i am not getting what is new MyCache() so i have to pass a cache instance to construct a Scala Cache. how to initialise mycache() how to create a ScalaCache instance reference : https://index.scala-lang.org/cb372/scalacache 回答1: MyCache is some implementation of Cache trait. There is one for each of following: The following cache implementations are supported, and it's

问题 Suppose I want to improve performance by loading whole contents of .css , .js and some other files (favicon, some images) directly from RAM memory without hitting disk. I can just write servlet/controller which will load those files on context init or first request and cache in simple String , but is there any standard already made solution to serve selected static resources from RAM in Spring, Servlets or Tomcat specification? It would be nice to support proper headers also (cache-control

问题 When my page does a post, I store all the $_POST data in a separate $_SESSION var. I know that a back button to this same page is by design to show the Document Expired message. My hope is to fool the browser into thinking that there was really never any $_POST data and so not to display the Document Expired message when coming back to it. I am forcing a complete refresh of the page so I am not worried about receiving old data, since I have it stored in the session. I have tried to unset($