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* the License. |
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*/ |
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import java.io.IOException; |
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import java.util.regex.Pattern; |
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import java.io.*; |
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import java.util.regex.*; |
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import javax.servlet.*; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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import javax.servlet.http.*; |
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/** |
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* This is a filter which enforces proper caching of the generated GWT script |
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* files. It requires that you serve your GWT application via a Java servlet |
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* container. |
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* <p> |
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* <p/> |
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* To use, add the jar to <code>WEB-INF/lib</code> and add the |
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* following to your deployment descriptor (web.xml): |
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* |
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* <p/> |
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* <pre> |
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* <filter> |
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* <filter-name>GWTCacheFilter</filter-name> |
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@@ -58,7 +56,7 @@ |
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* <param-value>.+\.cache\..+</param-value> |
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* </init-param></pre> |
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* |
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* <p> |
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* |
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* Usage notes |
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* <ul> |
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* <li>You can verify that the filter is being applied with Firefox's Web |
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* @see javax.servlet.Filter#init(javax.servlet.FilterConfig) |
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*/ |
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@Override |
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public void init(FilterConfig filterConfig) throws ServletException |
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public void init( FilterConfig filterConfig ) |
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throws ServletException |
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{ |
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String forceDontCachePatternString = filterConfig.getInitParameter(INITPARAM_FORCEDONTCACHE); |
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String forceCachePatternString = filterConfig.getInitParameter(INITPARAM_FORCECACHE); |
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if (forceDontCachePatternString == null) |
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String forceDontCachePatternString = filterConfig.getInitParameter( INITPARAM_FORCEDONTCACHE ); |
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String forceCachePatternString = filterConfig.getInitParameter( INITPARAM_FORCECACHE ); |
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if ( forceDontCachePatternString == null ) |
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{ |
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forceDontCachePatternString = DEFAULT_FORCEDONTCACHE; |
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} |
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if (forceCachePatternString == null) |
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if ( forceCachePatternString == null ) |
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{ |
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forceCachePatternString = DEFAULT_FORCECACHE; |
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} |
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forceDontCachePattern = Pattern.compile(forceDontCachePatternString); |
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forceCachePattern = Pattern.compile(forceCachePatternString); |
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forceDontCachePattern = Pattern.compile( forceDontCachePatternString ); |
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forceCachePattern = Pattern.compile( forceCachePatternString ); |
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} |
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/* |
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* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain) |
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*/ |
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@Override |
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException |
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public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain ) |
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throws IOException, ServletException |
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{ |
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if (request instanceof HttpServletRequest) |
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if ( request instanceof HttpServletRequest ) |
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{ |
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HttpServletRequest hRequest = (HttpServletRequest) request; |
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if (forceDontCachePattern.matcher(hRequest.getRequestURL()).matches()) |
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if ( forceDontCachePattern.matcher( hRequest.getRequestURL() ).matches() ) |
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{ |
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HttpServletResponse hResponse = (HttpServletResponse) response; |
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hResponse.setHeader("Cache-Control", "no-cache no-store must-revalidate"); |
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hResponse.setHeader("Pragma", "no-cache"); // HTTP/1.0 |
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hResponse.setDateHeader("Expires", 86400000); // January 2, 1970 |
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hResponse.setHeader( "Cache-Control", "no-cache no-store must-revalidate" ); |
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hResponse.setHeader( "Pragma", "no-cache" ); // HTTP/1.0 |
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hResponse.setDateHeader( "Expires", 86400000 ); // January 2, 1970 |
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} |
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else if (forceCachePattern.matcher(hRequest.getRequestURL()).matches()) |
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else if ( forceCachePattern.matcher( hRequest.getRequestURL() ).matches() ) |
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{ |
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HttpServletResponse hresponse = (HttpServletResponse) response; |
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// the w3c spec requires a maximum age of 1 year |
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// Firefox 3+ needs 'public' to cache this resource when received via SSL |
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hresponse.setHeader("Cache-Control", "public max-age=31536000"); |
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hresponse.setHeader( "Cache-Control", "public max-age=31536000" ); |
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// necessary to overwrite "Pragma: no-cache" header |
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hresponse.setHeader("Pragma", "temp"); |
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hresponse.setHeader("Pragma", ""); |
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hresponse.setDateHeader("Expires", System.currentTimeMillis() + 31536000000l); |
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hresponse.setHeader( "Pragma", "temp" ); |
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hresponse.setHeader( "Pragma", "" ); |
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hresponse.setDateHeader( "Expires", System.currentTimeMillis() + 31536000000l ); |
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} |
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} |
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chain.doFilter(request, response); |
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chain.doFilter( request, response ); |
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} |
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/* |
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