[java] view plaincopyprint?
/**
* @Title: PageEhCacheFilter.java
* @Package com.cqut.tool.cache
* @Description: TODO(用一句话描述该文件做什么)
* @author matao@cqrainbowsoft.com
* @date 2014-8-1 上午12:29:00
* @version V1.0
*/
package com.cqut.tool.cache;
import java.util.Enumeration;
import javax.servlet.FilterChain;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.constructs.blocking.LockTimeoutException;
import net.sf.ehcache.constructs.web.AlreadyCommittedException;
import net.sf.ehcache.constructs.web.AlreadyGzippedException;
import net.sf.ehcache.constructs.web.filter.FilterNonReentrantException;
import net.sf.ehcache.constructs.web.filter.SimplePageCachingFilter;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
/**
* 项目名称：<span style="font-family:Verdana, Geneva, Arial, Helvetica, sans-serif;">SpringMVCDemo</span> 类名称：PageEhCacheFilter 类描述： 创建人：熊海 创建时间：2014-8-1
* 上午12:29:00 修改人：熊海 修改时间：2014-8-1 上午12:29:00 修改备注：
*
* @version 1.0 <span style="font-family:Verdana, Geneva, Arial, Helvetica, sans-serif;">Superc102</span>
*/
public class PageEhCacheFilter extends SimplePageCachingFilter {
private final static Logger log = Logger.getLogger(PageEhCacheFilter.class);
private final static String FILTER_URL_PATTERNS = "patterns";
private static String[] cacheURLs;
private void init() throws CacheException {
String patterns = filterConfig.getInitParameter(FILTER_URL_PATTERNS);
cacheURLs = StringUtils.split(patterns, ",");
}
@Override
protected void doFilter(final HttpServletRequest request,
final HttpServletResponse response, final FilterChain chain)
throws AlreadyGzippedException, AlreadyCommittedException,
FilterNonReentrantException, LockTimeoutException, Exception {
if (cacheURLs == null) {
init();
}
String url = request.getRequestURI();
boolean flag = false;
if (cacheURLs != null && cacheURLs.length > 0) {
for (String cacheURL : cacheURLs) {
if (url.contains(cacheURL.trim())) {
flag = true;
break;
}
}
}
// 如果包含我们要缓存的url 就缓存该页面，否则执行正常的页面转向
if (flag) {
String query = request.getQueryString();
if (query != null) {
query = "?" + query;
}
log.info("当前请求被缓存：" + url + query);
super.doFilter(request, response, chain);
} else {
chain.doFilter(request, response);
}
}
@SuppressWarnings("unchecked")
private boolean headerContains(final HttpServletRequest request,
final String header, final String value) {
logRequestHeaders(request);
final Enumeration accepted = request.getHeaders(header);
while (accepted.hasMoreElements()) {
final String headerValue = (String) accepted.nextElement();
if (headerValue.indexOf(value) != -1) {
return true;
}
}
return false;
}
/**
*
* @see net.sf.ehcache.constructs.web.filter.Filter
*
* <b>function:</b> 兼容ie6/7 gzip压缩
*
* @author hoojo
*
* @createDate 2012-7-4 上午11:07:11
*/
@Override
protected boolean acceptsGzipEncoding(HttpServletRequest request) {
boolean ie6 = headerContains(request, "User-Agent", "MSIE 6.0");
boolean ie7 = headerContains(request, "User-Agent", "MSIE 7.0");
return acceptsEncoding(request, "gzip") || ie6 || ie7;
}
}
