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我正在尝试在 Ehcache 中缓存一个简单的网页。感谢另一篇 SO 帖子的帮助，我发现我需要基于 Ehcache 2 代码实现自己的过滤器。当我看过滤器时，我不明白。它在哪里调用缓存来返回值？这是我的实现（很可能是错误的）：

package com.sentiment360.pulse.cache;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.bind.Element;
import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.config.Configuration;
import static org.ehcache.config.builders.CacheManagerBuilder.newCacheManager;
import org.ehcache.core.Ehcache;
import org.ehcache.event.CacheEvent;
import org.ehcache.event.CacheEventListener;
import org.ehcache.xml.XmlConfiguration;

import javax.servlet.http.HttpServletRequest;

public class SimplePageCachingFilter implements CachingFilter {
     public static final String DEFAULT_CACHE_NAME = "SimplePageCachingFilter";
     private Logger LOG = Logger.getLogger(this.getClass().getName());
     private String cacheName="basicCache";

    protected String getCacheName() {
         if (cacheName != null && cacheName.length() > 0) {
              LOG.log(Level.INFO,"Using configured cacheName of {}.", cacheName);
              return cacheName;
          } else {
               LOG.log(Level.INFO,"No cacheName configured. Using default of {}.", DEFAULT_CACHE_NAME);
               return DEFAULT_CACHE_NAME;
           }
    }

    protected CacheManager getCacheManager() {
      return CacheManager.getInstance();
    }

    protected String calculateKey(HttpServletRequest httpRequest) {
      StringBuffer stringBuffer = new StringBuffer();
      stringBuffer.append(httpRequest.getMethod()).append(httpRequest.getRequestURI()).append(httpRequest.getQueryString());
      String key = stringBuffer.toString();
      return key;
    }
}
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1 回答 1

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见于超类。但是你implements CachingFilter呢？！那个界面在哪里？看起来您确实在尝试“复制”以前的 Ehcache SimplePageCachingFilter，对吗？您还需要移植该抽象超类（并且可能阅读一些关于javax.servlet.Filter，以防这些不完全清楚......）

现在，您可能还想就此向Ehcache Dev Google 小组的开发团队发送消息。他们应该能够提供指针，然后帮助实施。对于未来的拉取请求来说，这看起来是个好主意！:)

于 2017-08-24T01:45:55.257 回答