如何防止Grails缓存旧版本的gsp文件？ [英] How to prevent Grails from caching old versions of gsp file?

问题描述

我正在修改/grails-app/views/index.gsp。

当我保存文件并刷新 http：// localhost：8080 / index.gsp 在Firefox中，我收到了旧版本的文件。

有没有办法阻止Grails缓存和渲染旧版本的文件？

（我尝试重新启动服务器并清除Firefox的缓存。 ）

谢谢！

解决方案

似乎没有一个简单的方法来做到这一点，但它没有太多的工作。我的解决方案是呈现GSP的servlet（以及用于非GSP请求的控制器）的子类。

以下是servlet的子类：

  package com.burtbeckwith; 
 
 import java.io.IOException; 
 
 import javax.servlet.ServletException; 
 import javax.servlet.http.HttpServletRequest; 
 import javax.servlet.http.HttpServletResponse; 
 
导入org.codehaus.groovy.grails.web.pages.GroovyPagesServlet; 
 
 public class CachingPageServlet扩展GroovyPagesServlet {
 
 private static final String HEADER_PRAGMA =Pragma; 
 private static final String HEADER_EXPIRES =Expires; 
 private static final String HEADER_CACHE_CONTROL =Cache-Control; 
 $ b $ @Override 
 public void doPage（HttpServletRequest request，HttpServletResponse response）throws ServletException，IOException {
 response.setHeader（HEADER_PRAGMA，no-cache）; 
 response.setDateHeader（HEADER_EXPIRES，1L）; 
 response.setHeader（HEADER_CACHE_CONTROL，no-cache）; 
 response.addHeader（HEADER_CACHE_CONTROL，no-store）; 
 super.doPage（request，response）; 
} 
} 
  

，您需要在网页中替换原件.xml（运行grails install-templates并编辑src / templates / war / web.xml）：

 < servlet> ; 
< servlet-name> gsp< / servlet-name> 
< servlet-class> com.burtbeckwith.CachingPageServlet< / servlet-class> 
< / servlet> 
  

，你可能也想要为基于控制器的响应做同样的事情，所以要做到这一点使用这个控制器子类：

  package com.burtbeckwith; 
 
 import javax.servlet.http.HttpServletRequest; 
 import javax.servlet.http.HttpServletResponse; 
 
导入org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController; 
 import org.springframework.web.servlet.ModelAndView; 
 
 public class CachingSimpleGrailsController extends SimpleGrailsController {
 
 private static final String HEADER_PRAGMA =Pragma; 
 private static final String HEADER_EXPIRES =Expires; 
 private static final String HEADER_CACHE_CONTROL =Cache-Control; 
 
 @Override 
 public ModelAndView handleRequest（HttpServletRequest请求，HttpServletResponse响应）抛出异常{
 response.setHeader（HEADER_PRAGMA，no-cache）; 
 response.setDateHeader（HEADER_EXPIRES，1L）; 
 response.setHeader（HEADER_CACHE_CONTROL，no-cache）; 
 response.addHeader（HEADER_CACHE_CONTROL，no-store）; 
返回super.handleRequest（request，response）; 
 
 
 $ / code $ / pre 
 
 
你需要在grails- app / conf / spring / resources.groovy覆盖常规的Spring bean： 
 
 
  mainSimpleController（com.burtbeckwith.CachingSimpleGrailsController）{
 grailsApplication = ref（'grailsApplication'，true）
} 
  
共享标题设置代码可能应该被提取到工具类中，而不是像我在这里那样复制/粘贴。
 
I am making modifications to /grails-app/views/index.gsp.

When I save the file and refresh http://localhost:8080/index.gsp in Firefox, I am getting an old version of the file.

Is there a way to prevent Grails from caching and rendering old versions of the file?

(I tried restarting the server and clearing Firefox's cache.)

Thanks!
解决方案
There doesn't seem to be a simple way to do this, but it's not much work. My solution subclasses the servlet that renders GSPs (and also the controller that's used for non-GSP requests).

Here's the servlet subclass:
package com.burtbeckwith;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.codehaus.groovy.grails.web.pages.GroovyPagesServlet;

public class CachingPageServlet extends GroovyPagesServlet {

   private static final String HEADER_PRAGMA = "Pragma";
   private static final String HEADER_EXPIRES = "Expires";
   private static final String HEADER_CACHE_CONTROL = "Cache-Control";

   @Override
   public void doPage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      response.setHeader(HEADER_PRAGMA, "no-cache");
      response.setDateHeader(HEADER_EXPIRES, 1L);
      response.setHeader(HEADER_CACHE_CONTROL, "no-cache");
      response.addHeader(HEADER_CACHE_CONTROL, "no-store");
      super.doPage(request, response);
   }
}
and you'll need to replace the original in web.xml (run "grails install-templates" and edit src/templates/war/web.xml):
<servlet>
   <servlet-name>gsp</servlet-name>
   <servlet-class>com.burtbeckwith.CachingPageServlet</servlet-class>
</servlet>
and you'll probably also want to do the same for Controller-based responses, so to do that use this controller subclass:
package com.burtbeckwith;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController;
import org.springframework.web.servlet.ModelAndView;

public class CachingSimpleGrailsController extends SimpleGrailsController {

   private static final String HEADER_PRAGMA = "Pragma";
   private static final String HEADER_EXPIRES = "Expires";
   private static final String HEADER_CACHE_CONTROL = "Cache-Control";

   @Override
   public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
      response.setHeader(HEADER_PRAGMA, "no-cache");
      response.setDateHeader(HEADER_EXPIRES, 1L);
      response.setHeader(HEADER_CACHE_CONTROL, "no-cache");
      response.addHeader(HEADER_CACHE_CONTROL, "no-store");
      return super.handleRequest(request, response);
   }
}
and you'll need to register it in grails-app/conf/spring/resources.groovy to override the regular Spring bean:
mainSimpleController(com.burtbeckwith.CachingSimpleGrailsController) {
   grailsApplication = ref('grailsApplication', true)
}
The shared header-setting code should probably be extracted into a utility class instead of being copy/pasted like I did here.

                        
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