如何缓存DWR生成的JS文件To plugin this new Interface Processor, we need to add init parameter for DW
如何缓存DWR生成的JS文件
To plugin this new Interface Processor, we need to add init parameter for DWRServlet in web.xml. The snippet from web.xml would look like:
<servlet><servlet-name>dwr-invoker</servlet-name><servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class><init-param><param-name>interface</param-name><param-value>util.dwr.HttpCachingInterfaceProcessor</param-value></init-param>...</servlet>
After adding the custom inerface processor following are the headers for the dwr interface request.
GET /dekohportal/dwr/interface/locationchooser.js HTTP/1.1Host: localhostUser-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5Accept-Language: en,as;q=0.5Accept-Encoding: gzip,deflateAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7Keep-Alive: 300Connection: keep-aliveHTTP/1.x 200 OKServer: Pramati Server/5.0SP3 [Servlet/2.4 JSP/2.0]Date: Tue, 24 Jul 2007 05:49:43 GMT Last-Modified: Tue, 24 Jul 2007 05:49:33 GMTTransfer-Encoding: chunkedConnection: Keep-Alive
Notice that now for the first request, DWR is sending the Last-Modfied header. When we make the second request, the browser sends an “If-Modified-Since” header and DWR now sends a 304 NOT_MODIFIED response.
GET /dekohportal/dwr/interface/locationchooser.js HTTP/1.1Host: localhostUser-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5Accept-Language: en,as;q=0.5Accept-Encoding: gzip,deflateAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7Keep-Alive: 300Connection: keep-aliveIf-Modified-Since: Tue, 24 Jul 2007 05:49:33 GMT HTTP/1.x 304 NOT_MODIFIEDServer: Pramati Server/5.0SP3 [Servlet/2.4 JSP/2.0]Date: Tue, 24 Jul 2007 05:50:42 GMTContent-Length: 0Connection: Keep-Alive
Thus, by plugging in a custom interface processor, we can enable caching of interface java-scripts in DWR.
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原文：http://blogs.dekoh.com/dev/2007/07/24/caching-dwr-interface-java-script-files/